KR102043601B1 - Method for manufacturing a gallium nitride light emitting device - Google Patents

Abstract

Disclosed is a manufacturing method of a light emitting element. According to an embodiment of the present invention, the manufacturing method of a light emitting element comprises the steps of forming a mask layer including at least one window region and protrusion region on a growth substrate; forming gallium nitride (GaN) including Ga-polar GaN and N-polar GaN through epitaxial lateral overgrowth (ELOG) of GaN on the growth substrate; selectively etching the Ga-polar GaN; and removing the mask layer. The window region of the mask layer has a window pattern of a negative type.

Description

Manufacturing method of light emitting element {METHOD FOR MANUFACTURING A GALLIUM NITRIDE LIGHT EMITTING DEVICE}

Embodiments of the present invention relate to a method of manufacturing a light emitting device using epitaxial lateral overgrowth (ELOG) and selective etching.

Recently, III-V nitride semiconductors, such as gallium nitride (GaN), are due to their excellent physical and chemical properties such as light emitting diodes (LEDs), laser diodes (LDs), solar cells, optoelectronic devices, laser diodes, and high-frequency microelectronics. It is attracting attention as the core material of semiconductor optical devices such as devices. A III-V nitride semiconductor is usually made of a semiconductor material having a compositional formula of Al x In y Ga 1-x -y N (0 = x ≦ = 1, 0 ≦ = y ≦ = 1, 0 ≦ = x + y ≦ = 1). The nitride semiconductor optical device is applied as a light source of various products such as a backlight of a mobile phone, a keypad, an electronic board, an illumination device, and the like.

However, gallium nitride (GaN), unlike silicon (Si), is almost impossible to manufacture ingots, and thus has a great difficulty in producing a single crystal substrate. Therefore, gallium nitride was grown by sapphire substrate, silicon carbide substrate, or silicon substrate by growing a gallium nitride thick film by heteroepitaxial, and then separating the substrate to produce gallium nitride.

However, the method of forming gallium nitride as described above is tensioned or mitigated due to the mismatching of lattice pairs between layers, which leads to a high possibility of dislocation, resulting in shortening of device life and limit of performance. There was this.

In addition, the production of gallium nitride at high quality is difficult to accommodate growth substrates that do not match closely to the crystal properties of gallium nitride because there is no suitable growth substrate that matches high quality bulk crystals and / or crystal properties of these materials. Defects and dislocations (for gallium nitride, in particular threading dislocations (TD) originating at the interface between the growth substrate and GaN).

In addition, as a technique for separating gallium nitride, a laser lift off (LLO) method or a chemical lift off (CLO) method was mainly used.

However, the laser lift off (LLO) method is a technique of separating and dissolving an interface between a substrate and a thick film by a laser, and has a problem of high defect occurrence rate and high cost in the separation process, and chemical lift off (CLO); Chemical Lift Off) method is relatively inexpensive and has a low incidence of additional defects in the separation process, but requires a chemically etchable sacrificial layer, so that the crystallinity of gallium nitride grown on the sacrificial layer is relatively low. There was this.

In addition, such gallium nitride (GaN) based light emitting devices (GaN-LEDs) are expected to be used in future high efficiency lighting applications to replace incandescent and fluorescent lighting lamps. However, gallium nitride (GaN) light emitting devices developed to date need further improvement in terms of luminous efficiency, light output and price, and in particular, in order to extend the application of gallium nitride (GaN) light emitting devices to general lighting, Achieving high brightness by improving the quality is considered a top priority.

That is, the light generated inside the gallium nitride (GaN) light emitting device generates a total internal reflection due to the difference in refractive index between the semiconductor and the air, thereby increasing the light extraction efficiency. ) It has been an obstacle to higher luminance of light emitting devices.

Accordingly, in order to improve high light extraction efficiency, there is a demand for a method of manufacturing a high brightness micro LED that minimizes photons that are geometrically trapped inside the device and are trapped inside the device.

In the conventional micro LED, a light emitting structure is mainly grown on a sapphire substrate, and then patterned to a micro size to manufacture a micro LED, and then the electrodes are connected to each other. Implement When using this method, there are problems of light efficiency due to crystalline defects, complicated manufacturing processes, and technical difficulties in separating chips from substrates.

Korean Patent No. 10-1354491, "Method of manufacturing high efficiency light emitting diode" US Patent Publication No. 2010-0317132, "Printed assemblies of ultrathin, microscale inorganic light emitting diodes for deformable and semitransparent displays" WO2015-193436, "SYSTEMS AND METHODS FOR PREPARING GAN AND RELATED MATERIALS FOR MICRO ASSEMBLY"

Hoon-sik Kim, Unusual strategies for using indium gallium nitride grown on silicon (111) for solid-state lighting, 2011 Tae-il Kim, High efficiency, microscale GaN light-emitting diodes and their thermal properties on unusual substrates, 2012

An object of embodiments of the present invention is to epitaxially lateral overgroose (ELOG) an n-type semiconductor layer to selectively grow a Ga-polar light emitting structure and an N-polar light emitting structure, and then selectively convert the Ga-polar light emitting structure. It is for manufacturing a high quality vertical light emitting device by using a removing process.

An object of embodiments of the present invention is to epitaxially lateral overgroose (ELOG) an n-type semiconductor layer to selectively grow a Ga-polar light emitting structure and an N-polar light emitting structure, and then selectively convert the Ga-polar light emitting structure. In order to improve the indium incorporation (In-incorporation) by using a removal process to manufacture a vertical type light emitting device that the wavelength region is extended to the green (green) region.

It is also an object of embodiments of the present invention to epitaxially lateral overgroose (ELOG) an n-type semiconductor layer to selectively grow a Ga-polar light emitting structure and an N-polar light emitting structure, and then selectively Ga-polar By using a polarity-inverted lateral overgrowth using a process of removing the light emitting structure there is almost no penetration potential to manufacture a vertical light emitting device having improved light efficiency in the long wavelength region.

An object of embodiments of the present invention is to easily remove the growth substrate from the light emitting device by using a chemical etching that does not require a sacrificial layer, and to reduce the damage of the light emitting device due to the growth substrate removal process, thereby maintaining the characteristics of the high quality light emitting device It is to let.

An object of the embodiments of the present invention is to produce a light emitting device using a process of selectively growing the Ga-polar light emitting structure and the N-polar light emitting structure, and then selectively remove the Ga-polar light emitting structure, To simplify the manufacturing process, to reduce the manufacturing cost.

An object of embodiments of the present invention is to epitaxially lateral overgroose (ELOG) an n-type semiconductor layer to selectively grow a Ga-polar n-type semiconductor layer and an N-polar n-type semiconductor layer, and then selectively It is for manufacturing a high quality n-type semiconductor layer using a process of removing a Ga-polar n-type semiconductor layer.

In accordance with another aspect of the present invention, a method of manufacturing a light emitting device includes: forming a mask layer including at least one window area and a protrusion area on a substrate; An epitaxial lateral overgrowth (ELOG) on the growth substrate and an active layer and a p-type semiconductor layer on the n-type semiconductor layer to grow a Ga-polar light emitting structure and Forming a light emitting structure comprising an N-polar light emitting structure; Selectively etching the Ga-polar light emitting structure; Forming a first electrode on top of the N-polar light emitting structure; And forming a second electrode at a lower end of the N-polar light emitting structure, wherein the window area of the mask layer has a window pattern of a negative type.

The negative type window pattern may have a dot shape, a polygon shape, an elliptical shape, or a stripe shape.

The N-polar light emitting structure formed on the protruding region may have a negative pattern.

Only the Ga-polar light emitting structure may be grown on the window region, and only the N-polar light emitting structure may be grown on the protruding region, or the Ga-polar light emitting structure and the N-polar light emitting structure may be mixed and grown.

The first electrode and the second electrode may be formed to apply a current perpendicular to the light emitting structure.

The first electrode and the second electrode may be formed separately on each of the N-polar light emitting structures.

Selectively etching the Ga-polar light emitting structure may use hydrogen chloride gas (HCl gas).

The active layer may be formed as a single-quantum well structure or a multi-quantum well structure (MQW).

The active layer may include at least one of indium gallium nitride (InGaN), aluminum gallium nitride (AlGaN), gallium nitride (GaN), and aluminum indium gallium nitride (AlInGaN). It may include.

The growth substrate may include at least one of sapphire, gallium arsenide (GaAs), spinel, spinel, silicon (Si), indium phosphide (InP) and silicon carbide (SiC). It can be one.

The mask layer may include at least one of silicon oxide (SiO 2), silicon nitride (SiN x), and silicon oxynitride (SiON).

The n-type semiconductor layer may include gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), and aluminum indium gallium nitride (AlInGaN). It may include at least one of.

The p-type semiconductor layer may be formed of gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), indium nitride (InN), or aluminum nitride (InN). At least one of aluminum nitride (AlN) and aluminum indium gallium nitride (AlInGaN) may be included.

In another aspect, a light emitting device manufacturing method includes: forming a mask layer including at least one window area and a protruding area on a substrate; An n-type semiconductor layer including an Ga-polar n-type semiconductor layer and an N-polar n-type semiconductor layer by epitaxial lateral overgrowth (ELOG) on the growth substrate. Forming a; Selectively etching the Ga-polar n-type semiconductor layer; Growing an active layer and a p-type semiconductor layer on the N-polar n-type semiconductor layer to form a light emitting structure; Forming a first electrode on top of the light emitting structure; And forming a second electrode at a lower end of the light emitting structure, wherein the window area of the mask layer has a window pattern of a negative type.

The negative type window pattern may have a dot shape, a polygon shape, an elliptical shape, or a stripe shape.

In another embodiment, a light emitting device manufacturing method includes: forming a mask layer including at least one window area and a protruding area on a substrate; An n-type semiconductor layer including an Ga-polar n-type semiconductor layer and an N-polar n-type semiconductor layer by epitaxial lateral overgrowth (ELOG) on the growth substrate. Forming a; Selectively etching the Ga-polar n-type semiconductor layer; Laterally growing the N-polar n-type semiconductor layer; Growing an active layer and a p-type semiconductor layer on the laterally grown N-polar n-type semiconductor layer to form a light emitting structure; Forming a first electrode on top of the light emitting structure; Forming a second electrode at a lower end of the light emitting structure, wherein the window area of the mask layer has a negative type window pattern

The negative type window pattern may have a dot shape, a polygon shape, an elliptical shape, or a stripe shape.

In the method of manufacturing a light emitting device according to embodiments of the present invention, an n-type semiconductor layer is epitaxially lateral overgroove (ELOG) to selectively grow a Ga-polar light emitting structure and an N-polar light emitting structure, and then selectively Ga In-incorporation may be improved by using a process of removing the polar light emitting structure, thereby manufacturing a vertical light emitting device having a wavelength region extended to a green region.

In addition, the light emitting device manufacturing method according to the embodiments of the present invention by epitaxial side over-gross (ELOG) of the n-type semiconductor layer to selectively grow the Ga-polar light emitting structure and the N-polar light emitting structure, and then selectively By using the polarity-inverted lateral overgrowth using the process of removing the Ga-polar light emitting structure, there is almost no penetrating potential, thus manufacturing a vertical light emitting device having improved light efficiency in the long wavelength region. have.

In the method of manufacturing a light emitting device according to embodiments of the present invention, an n-type semiconductor layer is epitaxially lateral overgroove (ELOG) to selectively grow a Ga-polar light emitting structure and an N-polar light emitting structure, and then selectively Ga The defect ratio of the light emitting device can be reduced by using a process of removing the polar light emitting structure.

The method of manufacturing the light emitting device according to the embodiments of the present invention removes the growth substrate from the light emitting device by using chemical etching that does not require a sacrificial layer, thereby reducing damage to the light emitting device due to the growth substrate removal process, thereby providing a high quality light emitting device. Can maintain the characteristics of

The light emitting device manufacturing method according to the embodiments of the present invention emits light using a process of selectively growing the light emitting structure of the Ga-polar light emitting structure and the N-polar light emitting structure, and then selectively removing the Ga-polar light emitting structure. By manufacturing the device, the manufacturing process can be simplified and the manufacturing cost can be reduced.

In the method of manufacturing a light emitting device according to embodiments of the present invention, an n-type semiconductor layer is epitaxially lateral overgroove (ELOG) to selectively grow a Ga-polar n-type semiconductor layer and an N-polar n-type semiconductor layer. After this, a high quality n-type semiconductor layer used for manufacturing a vertical light emitting device may be manufactured by selectively removing a Ga-polar n-type semiconductor layer.

1 is a diagram illustrating Ga-polarity and N-polarity of gallium nitride.
2A to 2G are cross-sectional views illustrating a method of manufacturing a light emitting device according to an embodiment of the present invention.
3 is a plan view illustrating an N-polar light emitting structure after removing the growth substrate and the mask layer in the light emitting device manufacturing method according to the embodiment of the present invention.
4A to 4G are cross-sectional views illustrating a method of manufacturing a light emitting device according to another embodiment of the present invention.
5A to 5H are cross-sectional views illustrating a method of manufacturing a light emitting device according to still another embodiment of the present invention.
FIG. 6 is an image illustrating a Ga-polar light emitting structure and an N-polar light emitting structure partially subjected to a dry etching process.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the present invention is not limited or limited by these embodiments. Like reference numerals in the drawings denote like elements.

The terminology used in the description below has been selected to be general and universal in the art to which it relates, although other terms may vary depending on the development and / or change in technology, conventions, and preferences of those skilled in the art. Therefore, the terms used in the following description should not be understood as limiting the technical spirit, and should be understood as exemplary terms for describing the embodiments.

In addition, in certain cases, there is a term arbitrarily selected by the applicant, and in this case, the meaning thereof will be described in detail in the corresponding description. Therefore, the terms used in the following description should be understood based on the meanings of the terms and the contents throughout the specification, rather than simply the names of the terms.

Meanwhile, terms such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only to distinguish one component from another.

In addition, when a part such as a film, layer, area, configuration request, etc. is said to be "on" or "on" another part, it is not only when it is directly above another part, but also in the middle of the other film, layer, watershed, component It also includes the case where it is interposed.

1 is a diagram illustrating Ga-polarity and N-polarity of gallium nitride.

Gallium nitride is used as a core material for various optical devices because of its excellent physical and chemical properties. Gallium nitride is used by growing by heteroepitaxial on a growth substrate such as sapphire, silicon carbide or silicon.

Care must be taken in crystal quality in order to grow gallium nitride. In particular, crystal quality may be improved by utilizing epitaxial lateral overgrowth (ELOG).

Epitaxial lateral overgrowth (ELOG) can grow not only gallium nitride in the vertical direction from the substrate, but also laterally over the masking pattern.

In addition, gallium nitride has not only defects, but especially "crystal polarity" as an important crystalline property.

Referring to FIG. 1, gallium (Ga) atoms are shown as large gray spheres, and nitrogen (N) atoms as small black spheres.

As shown in FIG. 1, each gallium atom in gallium nitride (eg, wurtzite gallium nitride) is tetrahedrally coordinated to four nitrogen atoms.

Gallium nitride may be divided into Ga-polar (+ c; 100) and N-polar (-c; 200) depending on directions. Wherein label c refers to a crystal plane that is horizontal to the plane of the epitaxy film.

It is important to note that the polarity of gallium nitride is not a surface property, but has a great influence on the bulk property of gallium nitride, and different properties may be expressed depending on the polarity. Therefore, the device may be manufactured by utilizing the polarity characteristics of the epitaxial gallium nitride growth layer.

In the present invention, Ga-polar (+ c; 100) gallium nitride and N-polar (-c; 200) gallium nitride are selectively grown, and only Ga-polar (+ c; 100) gallium nitride is selectively By removing the n-type semiconductor layer for the gallium nitride light emitting structure or the light emitting structure with improved light efficiency can be produced.

Hereinafter, a technique of manufacturing a light emitting device according to an embodiment of the present invention will be described with reference to FIGS. 2A to 2G.

2A to 2G are cross-sectional views illustrating a method of manufacturing a light emitting device according to an embodiment of the present invention.

In the method of manufacturing a light emitting device according to an embodiment of the present invention, the method may include forming a mask layer 320 including at least one window region 321 and a protruding region 322 on a growth substrate 310. Epitaxial lateral overgrowth (ELOG) on the n-type semiconductor layer 331 on the 310, and an active layer 332 and a p-type semiconductor layer 333 are grown on the n-type semiconductor layer 331, Forming a light emitting structure 330 comprising a Ga-polar light emitting structure 341 and an N-polar light emitting structure 342 and selectively etching the Ga-polar light emitting structure 341.

In addition, forming the first electrode 350 on the top of the N-polar light emitting structure 342 and forming the second electrode 360 on the bottom of the N-polar light emitting structure 342.

The light emitting structure 330 is grown in the Ga-polar direction on the window region 321 (hereinafter referred to as “Ga-polar light emitting structure”) and in the N-polar direction on the protruding region 322. Grown light emitting structure 342 (hereinafter referred to as “N-polar light emitting structure”).

2A is a cross-sectional view of a mask layer including at least one window region and a protruding region formed on a growth substrate.

The mask layer 320 may be deposited on the growth substrate 310 using a deposition process or a solution process, and then patterned using photolithography processes.

The mask layer 320 may include a window region 321 and a protrusion region 322 by a patterning process, and then the n-type semiconductor layer may be grown through the window region 321 of the mask layer 320. have.

In addition, the window region 321 of the mask layer 320 may have a negative type window pattern, and the negative type window pattern may have a dot shape, a polygon shape, It may be an elliptical shape or a stripe shape, but is not limited thereto.

Therefore, the light emitting device manufactured by the light emitting device manufacturing method according to the exemplary embodiment of the present invention may manufacture a light emitting device formed in a negative pattern.

That is, since the light emitting structures are grown on the protruding region 322 and the window region 321, the light emitting structures grown on the window region 321 are subsequently removed by chemical etching, so that the light emitting structures are dots. It may be formed into a structure including a hole of a pattern such as shape, polygonal shape, elliptical shape or stripe shape.

A negative pattern of the light emitting device will be described in detail with reference to FIG. 3.

The growth substrate 310 is formed of sapphire, gallium arsenide (GaAs), spinel, silicon (Si), indium phosphide (InP), and silicon carbide (SiC). It may be at least one, and preferably sapphire may be used.

The mask layer 320 may include at least one of silicon oxide (SiO ₂ ), silicon nitride (SiNx) and silicon oxynitride (SiON). Can be used.

2B and 2C are cross-sectional views in which an n-type semiconductor layer is epitaxially lateral overgroove (ELOG) on a growth substrate.

The n-type semiconductor layer 331 may be grown by an epitaxial lateral overgrowth (ELOG) method.

In the epitaxial lateral overgrowth ELOG, the n-type semiconductor layer 331 may be grown not only in the vertical direction from the growth substrate 310 but also in the lateral direction above the mask layer 320.

First, as shown in FIG. 2B, the n-type semiconductor layer 331 is vertically grown through the window region 321 of the mask layer 320. Thereafter, in the last step of growth, the n-type semiconductor layer 331 may be grown by extending laterally of the protruding region 322 of the mask layer 320.

As a result, in the laterally grown n-type semiconductor layer 331, after a predetermined time, the vertically grown n-type semiconductor layer 331 is merged, as shown in Figure 2c, the growth substrate 310 and the mask An n-type semiconductor layer 331 grown on the upper surface of the layer 320 may be formed.

The grown n-type semiconductor layer 331 is grown on the Ga-polar n-type semiconductor layer grown on the window region 321 of the mask layer 320 and the protruding region 322 of the mask layer 320. It may include an N-polar n-type semiconductor layer 331.

In addition, only the Ga-polar n-type semiconductor layer is grown on the window region 321, and only the N-polar n-type semiconductor layer is grown on the protruding region 322, or the Ga-polar n-type semiconductor layer and N- The polar n-type semiconductor layer may be mixed and grown.

When the n-type semiconductor layer 331 is epitaxially lateral overgroove (ELOG) on the mask layer 320 including the window region 321 and the protruding region 322, Ga-polar n generally over the entire region. Only one type of -type semiconductor layer or N-polar n-type semiconductor layer is grown over the entire region.

However, in the method of manufacturing the light emitting device according to the exemplary embodiment, the n-type semiconductor layer 331 is epitaxially lateral overgroove on the mask layer 320 including the window region 321 and the protruding region 322. In the case of (ELOG), by using specific conditions, only the Ga-polar n-type semiconductor layer is grown on the window region 321 and only the N-polar n-type semiconductor layer is grown on the protrusion region. inversion) property.

More specifically, a Ga-polar n-type semiconductor layer is grown on the window region 321, and polarity reversal occurs at the pattern boundary between the window region 321 and the protrusion region 322, so that the upper portion of the protrusion region 322 is formed. Only N-polar n-type semiconductor layers can be grown.

The n-type semiconductor layer 331 includes gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), and aluminum indium gallium nitride (AlInGaN). gallium nitride (GaN) may be used.

Each gallium atom of gallium nitride used as an n-type semiconductor layer is tetrahedrally coordinated to four nitrogen atoms, and the N-polar n-type semiconductor layer characteristic and the Ga-polar n-type semiconductor layer characteristic are changed according to directions. Have

In addition, the Ga-polar n-type semiconductor layer grown on the window region 321 may be a defect region having a higher defect ratio than the N-polar n-type semiconductor layer grown on the protrusion region 322. .

2D is a cross-sectional view of a light emitting structure including a Ga-polar light emitting structure and an N-polar light emitting structure by growing an active layer and a p-type semiconductor layer on an n-type semiconductor layer.

The active layer 332 may have a structure in which a quantum well using a material having a small energy band gap and a quantum barrier using a material having a large energy band gap are alternately stacked at least once. The quantum well may have a single quantum well structure or a multi-quantum well structure (MQW).

Preferably, indium gallium nitride (InGaN) may be used as the quantum well, and gallium nitride (GaN) may be used as the quantum barrier, but is not limited thereto.

The active layer 332 may include at least one of indium gallium nitride (InGaN), aluminum gallium nitride (AlGaN), gallium nitride (GaN), and aluminum indium gallium nitride (AlInGaN). It may include any one.

The p-type semiconductor layer 333 may be formed of gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), indium nitride (InN), or aluminum. At least one of nitride (AlN) and aluminum indium gallium nitride (AlInGaN) may be included, and preferably gallium nitride (GaN) may be used.

The light emitting structure 330 formed by growing the active layer 332 and the p-type semiconductor layer 333 on the n-type semiconductor layer 331 is a Ga-polar light emitting structure 341 grown on the window region 321. ) And an N-polar light emitting structure 342 grown on the protruding region 322.

In addition, only the Ga-polar light emitting structure 341 is grown on the window region 321, and only the N-polar light emitting structure 342 is grown on the protruding region 322, or the Ga-polar light emitting structure 341 and the N− is grown. The polar light emitting structure 342 may be mixed and grown.

In addition, the Ga-polar light emitting structure 341 grown on the window area may be a defect area having a higher defect ratio than the N-polar light emitting structure 342 grown on the protruding area.

2E is a cross-sectional view where the Ga-polar light emitting structure is selectively etched.

The light emitting structure may exhibit a difference in etching speed according to polarity. The N-polar light emitting structure 342 is relatively etch resistant to hydrogen chloride gas (HCl gas), while the Ga-polar light emitting structure 341 is easily etched in hydrogen chloride gas (HCl gas).

The Ga-polar light emitting structure 341 may be removed by dry etching using hydrogen chloride gas (HCl gas).

More specifically, dry etching using hydrogen chloride gas (HCl gas) is the Ga-polar light emitting structure 341 and the N-polar light emitting structure while maintaining the temperature inside the quartz reactor (700 ℃ to 900 ℃) The growth substrate 310 having the 342 grown therein may be introduced, and hydrogen chloride gas may be injected to etch it.

The Ga-polar light emitting structure 341 may be etched in a form in which nanowires are initially formed in dry etching using hydrogen chloride gas (see FIG. 6), and eventually all may be etched.

On the other hand, when the N-polar light emitting structure 342 is injected with hydrogen chloride gas, only a portion where threading dislocation exists is etched. Since it was grown by the lateral overgloss (ELOG) method, it does not contain a through dislocation and is not etched.

However, in some cases, a penetrating potential may be formed in the N-polar light emitting structure 342 grown on the protruding region 322, and a local region including a penetrating potential present in the N-polar light emitting structure 342. It can be etched by this hydrogen chloride gas. However, since the N-polar light emitting structure 342 grown on the protruding region 322 has a very low through dislocation density, most of the N-polar light emitting structure 342 remains unetched.

Thus, the growth of the Ga-polar light emitting structure 341 on the window region 321 and the N-polar light emitting structure 342 on the protruding region 322 through the epitaxial lateral overgloss (ELOG) method. The Ga-polar light emitting structures 341 grown on the window region 321 are all etched by hydrogen chloride gas, but the N-polar light emitting structures 342 grown on the protruding region 322 are not etched. Only the polar light emitting structure 341 may be selectively etched.

Further, according to an embodiment, the Ga-polar light emitting structure 341 may be etched by a dry etching method using an additional mask, and the dry etching method may be reactive ion etching (RIE), electron cyclotron resonance (ECR), and ICP (ICP). At least one of Inductively Coupled Plasma).

The N-polar light emitting structure 342 is relatively etch resistant to hydrogen chloride gas (HCl gas), while the Ga-polar light emitting structure 341 is easily etched in hydrogen chloride gas (HCl gas).

Accordingly, the light emitting device manufacturing method according to an embodiment of the present invention can easily remove the Ga-polar light emitting structure 341 without using an additional mask only by chemical etching using hydrogen chloride gas (HCl gas).

Therefore, the light emitting device manufacturing method according to an embodiment of the present invention selectively removes only the Ga-polar light emitting structure 341 so that only the N-polar light emitting structure 342 exists.

In addition, the light emitting device manufacturing method according to an embodiment of the present invention by epitaxial side over-gross (ELOG) of the n-type semiconductor layer to selectively select the Ga-polar light emitting structure 341 and the N-polar light emitting structure 342 After the growth, the vertical type light emitting device in which the wavelength region is extended to the green region by improving the in-incorporation using a process of selectively removing the Ga-polar light emitting structure 341. Can be prepared.

In-incorporation supplies indium (In) together with gallium (Ga) in the condition of growing gallium nitride (GaN), and the indium (In) is positioned at the lattice position where gallium (Ga) is to be inserted (included). incorporation, which acts as an important factor in the process of combining gallium nitride (GaN) and indium nitride (InN) to form indium gallium nitride (InGaN).

If the ratio of indium (In) to the position of the lattice to enter gallium (Ga), that is, the larger the In-incorporation, the larger the value of x in In _x Ga _{1 - x} N is nitrided As the bandgap of gallium (GaN) 3.4eV is gradually reduced, the wavelength can be extended to the green region, and ultimately, it can be reduced to 0.8eV, which is the bandgap of indium nitride (InN). The bandgap of the green region is about 2.2 eV and the bandgap of the infrared region is about 0.8 eV.

Therefore, in order to increase the wavelength to the green region, a considerable amount of indium (In) must be incorporated.However, in order to increase the amount of indium (In) simply by increasing the amount of indium (In) under the conditions in which gallium nitride (GaN) is grown, The value is not increased.

However, in the case of gallium nitride (GaN), since the incorporation of indium (In) in N-polar gallium nitride is better than Ga-polar gallium nitride, the light emitting device manufacturing method according to an embodiment of the present invention is Ga In-incorporation using a process of selectively growing the polar light emitting structure 341 and the N-polar light emitting structure 342 and then selectively removing the Ga-polar light emitting structure 341. As a result, the wavelength region can be extended to the green region.

In addition, the light emitting device manufacturing method according to an embodiment of the present invention by epitaxial side over-gross (ELOG) of the n-type semiconductor layer, to selectively select the Ga-polar light emitting structure 341 and the N-polar light emitting structure 342 After growth, the penetration potential is reduced by using polarity-inverted lateral overgrowth using a process of selectively removing the Ga-polar light emitting structure 341 so that the penetration potential is virtually absent. A vertical light emitting device having improved light efficiency in a long wavelength region can be manufactured.

2F is a cross-sectional view in which a first electrode is formed on the top of the N-polar light emitting structure.

First, the mask layer may be removed by chemical etching, and may be performed by wet etching using any one or a combination solution of one or more of hydrofluoric acid (HF) and buffered oxide etchant. Hydrofluoric acid (HF) may be used, preferably.

In the method of manufacturing a light emitting device according to an embodiment of the present invention, the N-polar light emitting structure 242 is separated from the substrate by using chemical etching that does not require a sacrificial layer, thereby damaging the light emitting device due to the process of removing the growth substrate 310. In this way, high quality gallium nitride substrate 333 characteristics can be maintained.

Thereafter, the first electrode 350 is formed on the N-polar light emitting structure 242.

In FIG. 2F, the first electrode 350 is formed on the front surface of the upper portion of the N-polar light emitting structure 242. However, the present invention is not limited thereto, and the first electrode 350 is formed on each of the N-polar light emitting structures 242. Can be formed.

The first electrode 350 may be a p-type electrode, and the first electrode 350 may be platinum (Pt), palladium (Pd), aluminum (Al), gold (Au), silver (Ag), or nickel / gold. (Ni / Au), titanium / aluminum (Ti / Al), indium tin oxide (ITO) or zinc oxide (ZnO) may be used alone or in combination.

The first electrode 350 may be attached to the N-polar light emitting structure 242 using a support substrate (not shown), and more particularly, a thermal evaporator on the support substrate (not shown). ), The first electrode 350 formed through an E-beam evaporator method, an RF or DC sputter method, or various electrode forming methods may be attached to the N-polar light emitting structure 242. It is not limited to this. In addition, the support substrate (not shown) may be removed as needed.

2G is a cross-sectional view in which a second electrode is formed at the bottom of the N-polar light emitting structure.

The second electrode 360 is attached to the bottom of the N-polar light emitting structure 242, that is, the surface on which the first electrode 350 is not formed.

In FIG. 2G, the first electrode 350 formed on the front surface of the lower end of the N-polar light emitting structure 242 is illustrated, but is not limited thereto, and the second electrode 360 formed on each of the N-polar light emitting structures 242 is illustrated. Can be formed.

The second electrode 360 may be an n-type electrode, and the second electrode 360 may be platinum (Pt), palladium (Pd), aluminum (Al), gold (Au), silver (Ag), or nickel / gold. (Ni / Au), titanium / aluminum (Ti / Al), indium tin oxide (ITO) or zinc oxide (ZnO) may be used alone or in combination.

The second electrode 360 may be formed by a thermal evaporator method, an E-beam evaporator method, a sputtering method, or various electrode forming methods.

The second electrode 360 may be attached to the N-polar light emitting structure 242 using a support substrate (not shown), and more specifically, a thermal evaporator on the support substrate (not shown). ), The second electrode 360 formed through an E-beam evaporator method, an RF or DC sputter method, or various electrode forming methods may be attached to the N-polar light emitting structure 242. It is not limited to this. In addition, the support substrate (not shown) may be removed as needed.

Therefore, in the light emitting device 300 manufactured by using the method of manufacturing the light emitting device 300 according to the embodiment of the present invention, the first electrode 350 and the second electrode 360 are formed in a vertical structure. The first electrode 350 and the second electrode 360 may be formed to vertically apply a current to the light emitting device 300.

In addition, when the electrode is formed on the front surface of the N-polar light emitting structure 242 of the light emitting device manufactured by using the method of manufacturing the light emitting device 300 according to an embodiment of the present invention, it is easy to use in a lamp (lamp) In addition, an electrode formed on each of the N-polar light emitting structures 242 may be easily used as a display.

In addition, when the light emitting device 300 is obtained, when the first electrode 350 is disposed above and the second electrode 360 is disposed below, the method of manufacturing the light emitting device 300 according to an embodiment of the present invention Since the light emitting structure was grown in the N-polar direction, the N-polar light emitting device 300 can be obtained.

In addition, the light emitting device manufactured by using the manufacturing method of the light emitting device 300 according to an embodiment of the present invention may be a micro LED.

In addition, the light emitting device 300 manufactured according to the method of manufacturing the light emitting device 300 according to an embodiment of the present invention is a Ga-polar light emitting structure 341 and N by using an epitaxial lateral overgloss (ELOG) method. -By selectively growing the polar light emitting structure 342 and then selectively removing the Ga-polar light emitting structure 341, the manufacturing process can be simplified to reduce the manufacturing cost.

In addition, by using a light emitting device manufactured using a method of manufacturing a light emitting device 300 according to an embodiment of the present invention, it can be utilized for general lighting that can replace a luminescent lamp. .

In addition, the light emitting device manufactured by using the method of manufacturing the light emitting device 300 according to an embodiment of the present invention may be used in a headset display (head set display) used in virtual reality or augmented reality.

3 is a plan view illustrating an N-polar light emitting structure after removing a growth substrate and a mask layer in the method of manufacturing a light emitting device according to an embodiment of the present invention.

3 shows that the window region 321 of the mask layer has a window pattern of a negative type having a dot shape, thereby forming a dot-shaped hole (a portion corresponding to the window region 321). An N-polar light emitting structure 342 may be formed.

Accordingly, when the N-polar light emitting structure 342 of FIG. 3 is used, a light emitting device formed in a negative pattern may be formed.

Hereinafter, a light emitting device manufacturing method according to another embodiment of the present invention will be described with reference to FIGS. 4A to 4G.

Since the method of manufacturing a light emitting device according to another embodiment of the present invention is manufactured using a method similar to that described with reference to FIGS. 2A to 2G, overlapping components will be omitted.

4A to 4G are cross-sectional views illustrating a method of manufacturing a light emitting device according to another embodiment of the present invention.

In another exemplary embodiment, a light emitting device manufacturing method includes forming a mask layer 420 including at least one window region 421 and a protrusion region 422 on a growth substrate 410. The n-type semiconductor layer 430 is epitaxial lateral overgrowth (ELOG) on the 410 to form a Ga-polar n-type semiconductor layer 431 and an N-polar n-type semiconductor layer 432. Forming an n-type semiconductor layer 430 including and selectively etching the Ga-polar n-type semiconductor layer 431.

In addition, growing the active layer 440 and the p-type semiconductor layer 450 on the N-polar n-type semiconductor layer 432 to form a light emitting structure 460, the top of the light emitting structure 460 Forming a first electrode 470 and forming a second electrode 480 at a lower end of the light emitting structure 460.

The n-type semiconductor layer 430 is an n-type semiconductor layer 431 (hereinafter referred to as a "Ga-polar n-type semiconductor layer") grown on the window region 421 in the Ga-polar direction and a protruding region ( The n-type semiconductor layer 431 (hereinafter, referred to as an “N-polar n-type semiconductor layer”) grown on the N-polar direction may be included on the 422.

4A is a cross-sectional view of a mask layer including at least one window region and a protrusion region formed on a growth substrate.

Preferably, sapphire may be used for the growth substrate 410.

The mask layer 420 may include a window region 421 and a protrusion region 422 by a patterning process, and then the n-type semiconductor layer may be grown through the window region 421 of the mask layer 420. have.

Silicon oxide may be used for the mask layer 420.

In addition, the window area 421 and the protruding area 422 of the mask layer 420 may have a negative type window pattern, and the negative type window pattern may have a dot shape, The shape may be a polygonal shape, an elliptical shape, or a stripe shape, but is not limited thereto.

4B and 4C are cross-sectional views in which an n-type semiconductor layer is epitaxially lateral overgroove (ELOG) on a growth substrate.

The n-type semiconductor layer 430 may be grown by an epitaxial lateral overgrowth (ELOG) method.

4B and 4C, the n-type semiconductor layer 430 is vertically grown through the window region 821 of the mask layer 420. Thereafter, in the last stage of growth, the n-type semiconductor layer 430 may be extended to extend laterally of the protruding region 422 of the mask layer 420.

After the predetermined time passes, the n-type semiconductor layer 430 grown laterally may be merged to form the n-type semiconductor layer 430 on the upper surfaces of the growth substrate 410 and the mask layer 420. .

The grown n-type semiconductor layer 430 is formed on the Ga-polar n-type semiconductor layer 431 and the protruding region 422 of the mask layer 420 grown on the window region 421 of the mask layer 420. It may include an N-polar n-type semiconductor layer 432 grown in.

In addition, only the Ga-polar n-type semiconductor layer 431 is grown on the window region 421, and only the N-polar n-type semiconductor layer 432 is grown on the protruding region 422, or Ga-polar n- The type semiconductor layer 431 and the N-polar n-type semiconductor layer 432 may be mixed and grown.

In addition, the Ga-polar n-type semiconductor layer 431 grown on the window region 421 has a higher defect ratio than the N-polar n-type semiconductor layer 432 grown on the protruding region 422. It may be a high defect area.

The n-type semiconductor layer 430 may include gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), and aluminum indium gallium nitride (AlInGaN). gallium nitride (GaN) may be used.

4D is a cross-sectional view of the Ga-polar n-type semiconductor layer selectively etched.

The Ga-polar n-type semiconductor layer 431 may be removed by dry etching using hydrogen chloride gas (HCl gas).

Gallium nitride exhibits a difference in etching rate depending on polarity. N-polar n-type semiconductor layer 432 is relatively etch resistant to hydrogen chloride gas (HCl gas), while Ga-polar n-type semiconductor layer 431 is easily etched in hydrogen chloride gas (HCl gas) Has characteristics.

Accordingly, the light emitting device manufacturing method according to another embodiment of the present invention can easily remove the Ga-polar n-type semiconductor layer 431 selectively without using an additional mask by chemical etching using hydrogen chloride gas (HCl gas). .

Accordingly, the light emitting device manufacturing method according to another embodiment of the present invention selectively removes only the Ga-polar n-type semiconductor layer 431 so that only the N-polar n-type semiconductor layer 432 is grown on the growth substrate 410. Will remain.

In addition, the light emitting device manufacturing method according to another embodiment of the present invention by epitaxial side over-gross (ELOG) of the n-type semiconductor layer, the Ga-polar n-type semiconductor layer 431 and the N-polar n-type semiconductor After the layer 432 is selectively grown, the process of selectively removing the Ga-polar n-type semiconductor layer 431 is used to enhance indium incorporation to the green region. An n-type semiconductor layer having an enlarged wavelength region can be manufactured.

In addition, the light emitting device manufacturing method according to another embodiment of the present invention by epitaxial side over-gross (ELOG) of the n-type semiconductor layer, the Ga-polar n-type semiconductor layer 431 and the N-polar n-type semiconductor The penetration potential is increased by selectively growing the layer 432 and then using polarity-inverted lateral overgrowth using a process of selectively removing the Ga-polar n-type semiconductor layer 431. Since the n-type semiconductor layer is hardly present, the light efficiency of the long wavelength region is improved.

4E is a cross-sectional view of a light emitting structure formed by growing an active layer and a p-type semiconductor layer on an N-polar n-type semiconductor layer.

The active layer 440 and the p-type semiconductor layer 450 are grown only on the N-polar n-type semiconductor layer 432 to form the formed light emitting structure 460.

Preferably, the N-polar n-type semiconductor layer, the active layer 440 and the p-type semiconductor layer 450 are only on the protruding region 422 excluding the dot type negative type window pattern. As a result, the light emitting structure 460 may be formed in a structure including a cylindrical hole.

The active layer 440 may have a structure in which a quantum well using a material having a small energy band gap and a quantum barrier using a material having a large energy band gap are alternately stacked at least once. The quantum well may have a single quantum well structure or a multi-quantum well structure (MQW).

Preferably, indium gallium nitride (InGaN) may be used as the quantum well, and gallium nitride (GaN) may be used as the quantum barrier, but is not limited thereto.

The active layer 440 may include at least one of indium gallium nitride (InGaN), aluminum gallium nitride (AlGaN), gallium nitride (GaN), and aluminum indium gallium nitride (AlInGaN). It may include any one.

The p-type semiconductor layer 450 may include gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), indium nitride (InN), or aluminum. At least one of nitride (AlN) and aluminum indium gallium nitride (AlInGaN) may be included, and preferably gallium nitride (GaN) may be used.

4F is a cross-sectional view of a first electrode formed on the top of the light emitting structure.

First, the mask layer may be removed by chemical etching, and may be performed by wet etching using any one or a combination solution of one or more of hydrofluoric acid (HF) and buffered oxide etchant. Hydrofluoric acid (HF) may be used, preferably.

Thereafter, the first electrode 470 is formed on the light emitting structure 460.

Although FIG. 4F illustrates the first electrode 470 formed on the front surface of the upper portion of the light emitting structure 460, the present invention is not limited thereto, and the first electrode 470 may be formed on each of the light emitting structures 460.

The first electrode 470 may be a p-type electrode, and the first electrode 470 may be platinum (Pt), palladium (Pd), aluminum (Al), gold (Au), silver (Ag), or nickel / gold. (Ni / Au), titanium / aluminum (Ti / Al), indium tin oxide (ITO) or zinc oxide (ZnO) may be used alone or in combination.

The first electrode 470 may be attached to the light emitting structure 460 using a support substrate (not shown), more specifically, a method of thermal evaporator on a support substrate (not shown), The first electrode 470 formed through an E-beam evaporator method, an RF or DC sputter method, or various electrode forming methods may be attached to the light emitting structure 460, but is not limited thereto. . In addition, the support substrate (not shown) may be removed as needed.

4G is a cross-sectional view in which a second electrode is formed at the bottom of the light emitting structure.

The second electrode 480 is attached to the bottom of the light emitting structure 460, that is, the surface on which the first electrode 470 is not formed.

In FIG. 4G, the first electrode 470 formed on the front surface of the lower end of the light emitting structure 460 is illustrated. However, the present invention is not limited thereto, and the second electrode 470 formed on each of the light emitting structures 460 may be formed.

The second electrode 470 may be an n-type electrode, and the second electrode 470 may be platinum (Pt), palladium (Pd), aluminum (Al), gold (Au), silver (Ag), nickel / gold (Ni / Au), titanium / aluminum (Ti / Al), indium tin oxide (ITO) or zinc oxide (ZnO) may be used alone or in combination.

The second electrode 470 may be formed by a thermal evaporator method, an E-beam evaporator method, a sputtering method, or a variety of electrode forming methods.

The second electrode 470 may be attached to the light emitting structure 460 using a support substrate (not shown), more specifically, a method of thermal evaporator on a support substrate (not shown), The second electrode 470 formed through an E-beam evaporator method, an RF or DC sputter method, or various electrode forming methods may be attached to the light emitting structure 460, but is not limited thereto. . In addition, the support substrate (not shown) may be removed as needed.

Therefore, in the light emitting device 400 manufactured by using the method of manufacturing the light emitting device 400 according to another embodiment of the present invention, the first electrode 470 and the second electrode 480 are formed in a vertical structure. The first electrode 470 and the second electrode 480 may be formed to vertically apply a current to the light emitting device 400.

In addition, when an electrode is formed on the front surface of the light emitting structure 460 of the light emitting device manufactured using the method of manufacturing the light emitting device 400 according to another embodiment of the present invention, it is easy to use in a lamp (lamp), the light emitting structure An electrode formed on each of the 460 is easy to use as a display.

In addition, when the light emitting device 400 is obtained, when the first electrode 470 is disposed above and the second electrode 480 is disposed below, the method of manufacturing the light emitting device 400 according to another embodiment of the present invention Since the n-type semiconductor layer is grown in the N-polar direction, the light emitting device 400 including the N-polar n-type semiconductor layer 432 can be obtained.

In addition, the light emitting device manufactured using the light emitting device 400 manufacturing method according to another embodiment of the present invention may be a micro LED.

In addition, the light emitting device 400 manufactured according to the method of manufacturing the light emitting device 400 according to another embodiment of the present invention is a Ga-polar n-type semiconductor layer 431 using an epitaxial side overgloss (ELOG) method. ) And the N-polar n-type semiconductor layer 432 are selectively grown, and then the Ga-polar n-type semiconductor layer 431 is selectively removed, thereby simplifying the manufacturing process and reducing the manufacturing cost. Can be reduced.

In addition, by using a light emitting device manufactured using a method of manufacturing a light emitting device 400 according to another embodiment of the present invention, it can be utilized for general lighting that can replace a luminescent lamp (luminescent lamp). .

Hereinafter, a light emitting device manufacturing method according to still another embodiment of the present invention will be described with reference to FIGS. 5A to 5H.

Since the method of manufacturing a light emitting device according to another embodiment of the present invention is manufactured using a method similar to that described with reference to FIGS. 4A to 4G, overlapping components will be omitted.

4A to 4G are cross-sectional views illustrating a method of manufacturing a light emitting device according to another embodiment of the present invention.

5A-5D illustrate forming a mask layer 520 including at least one window region 521 and a protruding region 522 on the growth substrate 510, n− on the growth substrate 510. n-type including a Ga-polar n-type semiconductor layer 531 and an N-polar n-type semiconductor layer 532 by epitaxial lateral overgrowth (ELOG) of the type semiconductor layer 530. The steps of forming the semiconductor layer 530 and selectively etching the Ga-polar n-type semiconductor layer 531 are illustrated.

5A to 5D are the same as those shown in FIGS. 4A to 4D of the method of manufacturing a light emitting device according to another embodiment of the present invention, and thus, overlapping components will be omitted.

Thus, the step of later growing the N-polar n-type semiconductor layer 532, the active layer 540 and the p-type semiconductor layer (on the side-grown N-polar n-type semiconductor layer 533) Growing the 550 to form the light emitting structure 560, forming the first electrode 570 on the top of the light emitting structure 560, and forming the second electrode 580 on the bottom of the light emitting structure 560. Forming step will be described in Figures 5e to 5h.

The n-type semiconductor layer 530 is an n-type semiconductor layer 531 (hereinafter referred to as a "Ga-polar n-type semiconductor layer") grown on the window region 521 in the Ga-polar direction and a protruding region ( The n-type semiconductor layer 531 (hereinafter, referred to as an “N-polar n-type semiconductor layer”) grown on the N-polar direction may be included on the 522.

5E is a cross-sectional view illustrating a laterally grown N-polar n-type semiconductor layer.

In the method of manufacturing a light emitting device according to another embodiment of the present invention, the N-polar n-type semiconductor layer 532 is laterally grown on the mask pattern 120 to form a dot-shaped hole (window region 521). Plate-like N-polar n-type semiconductor layer 533 may be formed.

By laterally growing the N-polar n-type semiconductor layer 532 on the mask pattern 520, the laterally grown N-polar n-type semiconductor layer 133 is formed.

The N-polar n-type semiconductor layer 133 laterally grown on the mask pattern 520 does not contact the growth substrate 510. That is, when the growth is much faster in the horizontal direction than in the vertical direction, since the N-polar n-type semiconductor layer 532 is very slow or hardly grown in the downward direction, the laterally grown N-polar n-type semiconductor layer 533 and 132 may be formed so as not to contact the growth substrate 510.

5F is a cross-sectional view of an active layer and a p-type semiconductor layer grown on a laterally grown N-polar n-type semiconductor layer.

The active layer 540 and the p-type semiconductor layer 550 are grown on the N-polar n-type semiconductor layer 533 to form the formed light emitting structure 560.

The active layer 540 may have a structure in which a quantum well using a material having a small energy band gap and a quantum barrier using a material having a large energy band gap are alternately stacked at least once. The quantum well may have a single quantum well structure or a multi-quantum well structure (MQW).

Preferably, indium gallium nitride (InGaN) may be used as the quantum well, and gallium nitride (GaN) may be used as the quantum barrier, but is not limited thereto.

The active layer 540 may include at least one of indium gallium nitride (InGaN), aluminum gallium nitride (AlGaN), gallium nitride (GaN), and aluminum indium gallium nitride (AlInGaN). It may include any one.

The p-type semiconductor layer 550 may be formed of gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), indium nitride (InN), or aluminum. At least one of nitride (AlN) and aluminum indium gallium nitride (AlInGaN) may be included, and preferably gallium nitride (GaN) may be used.

5G is a cross-sectional view in which a first electrode is formed on the top of the light emitting structure.

First, the mask layer may be removed by chemical etching, and may be performed by wet etching using any one or a combination solution of one or more of hydrofluoric acid (HF) and buffered oxide etchant. Hydrofluoric acid (HF) may be used, preferably.

Thereafter, a first electrode 570 is formed on the top of the light emitting structure 560.

Although FIG. 4F illustrates the first electrode 570 formed on the front surface of the upper portion of the light emitting structure 560, the present invention is not limited thereto, and the first electrode 570 may be formed on each of the light emitting structures 560.

The first electrode 570 may be a p-type electrode, and the first electrode 570 may be platinum (Pt), palladium (Pd), aluminum (Al), gold (Au), silver (Ag), or nickel / gold. (Ni / Au), titanium / aluminum (Ti / Al), indium tin oxide (ITO) or zinc oxide (ZnO) may be used alone or in combination.

The first electrode 570 may be attached to the light emitting structure 560 using a support substrate (not shown), more specifically, a thermal evaporator method on a support substrate (not shown), The first electrode 570 formed through an E-beam evaporator method, an RF or DC sputter method, or various electrode forming methods may be attached to the light emitting structure 560, but is not limited thereto. . In addition, the support substrate (not shown) may be removed as needed.

5H is a cross-sectional view in which a second electrode is formed at the bottom of the light emitting structure.

The second electrode 580 is attached to the bottom of the light emitting structure 560, that is, the surface on which the first electrode 570 is not formed.

Although FIG. 5H illustrates the first electrode 570 formed on the entire surface of the lower end of the light emitting structure 560, the present invention is not limited thereto, and the second electrode 570 formed on each of the light emitting structures 560 may be formed.

The second electrode 570 may be an n-type electrode, and the second electrode 570 may be platinum (Pt), palladium (Pd), aluminum (Al), gold (Au), silver (Ag), or nickel / gold. (Ni / Au), titanium / aluminum (Ti / Al), indium tin oxide (ITO) or zinc oxide (ZnO) may be used alone or in combination.

The second electrode 570 may be formed by a thermal evaporator method, an E-beam evaporator method, a sputtering (RF or DC sputter) method, or various electrode forming methods.

The second electrode 570 may be attached to the light emitting structure 560 using a support substrate (not shown), more specifically, a method of thermal evaporator on a support substrate (not shown), The second electrode 470 formed through an E-beam evaporator method, an RF or DC sputter method, or various electrode forming methods may be attached to the light emitting structure 460, but is not limited thereto. . In addition, the support substrate (not shown) may be removed as needed.

Therefore, in the light emitting device 500 manufactured by using the method of manufacturing the light emitting device 500 according to another embodiment of the present invention, the first electrode 570 and the second electrode 580 are formed in a vertical structure. Therefore, the first electrode 570 and the second electrode 580 may be formed to apply a current perpendicular to the light emitting device 500.

In addition, when the light emitting device 500 is obtained, when the first electrode 570 is disposed above and the second electrode 580 is disposed below, the method of manufacturing the light emitting device 500 according to another embodiment of the present invention. Since the light emitting structure was grown in the N-polar direction, the N-polar light emitting device 500 can be obtained.

In addition, when the electrode is formed on the front surface of the light emitting structure 560 of the light emitting device manufactured by using the manufacturing method of the light emitting device 500 according to another embodiment of the present invention, it is easy to use in the lamp (lamp), An electrode formed on each of the structures 560 is easy to use as a display.

In addition, when the light emitting device 500 is obtained, when the first electrode 570 is disposed above and the second electrode 580 is disposed below, the method of manufacturing the light emitting device 500 according to another embodiment of the present invention. Since the n-type semiconductor layer was grown in the N-polar direction, the light emitting device 500 including the N-polar n-type semiconductor layer 532 can be obtained.

In addition, the light emitting device manufactured by using the method of manufacturing the light emitting device 500 according to another embodiment of the present invention may be a micro LED.

In addition, the light emitting device 500 manufactured according to the method of manufacturing the light emitting device 500 according to another embodiment of the present invention is a Ga-polar n-type semiconductor layer ( 531) and a step of selectively growing the N-polar n-type semiconductor layer 532 and then selectively removing the Ga-polar n-type semiconductor layer 531, thereby simplifying the manufacturing process and manufacturing costs. Can be reduced.

In addition, by using a light emitting device manufactured using a method of manufacturing a light emitting device 500 according to another embodiment of the present invention, it can be utilized for general lighting that can replace a luminescent lamp (luminescent lamp) have.

FIG. 6 is an image illustrating a Ga-polar light emitting structure and an N-polar light emitting structure partially subjected to a dry etching process.

When the growth substrate on which the Ga-polar light emitting structure and the N-polar light emitting structure are grown is placed in a quartz reactor and hydrogen chloride gas is injected, the N-polar light emitting structure grown in the window region is etched only in the through-potential portion, Since the grown Ga-polar light emitting structure is mostly etched, it can be seen that the Ga-polar light emitting structure can be selectively etched using hydrogen chloride gas.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

100: Ga-polar (+ c) 200: N-polar (-c)
310, 410, 510: growth substrate 320, 420, 520: mask layer
321, 421, and 521: window areas 422 and 522: protrusion areas
330, 460, 560: Light emitting structure 331, 430, 530: n-type semiconductor layer
332, 440, 540: active layer 333, 450, 550: p-type semiconductor layer
341: Ga-polar light emitting structure 342: N-polar light emitting structure
350, 470, 570: first electrode 360, 480, 580: second electrode
300, 400: light emitting elements 431, 531: Ga-polar n-type semiconductor layer
432 and 532: N-polar n-type semiconductor layers
533: Lateral grown N-polar n-type semiconductor layer

Claims (17)

Forming a mask layer on the growth substrate, the mask layer comprising at least one window region and a protrusion region;
An epitaxial lateral overgrowth (ELOG) on the growth substrate and an active layer and a p-type semiconductor layer on the n-type semiconductor layer to grow a Ga-polar light emitting structure and Forming a light emitting structure comprising an N-polar light emitting structure;
Selectively etching the Ga-polar light emitting structure;
Forming a first electrode on top of the N-polar light emitting structure; And
Forming a second electrode on the bottom of the N-polar light emitting structure
Including,
The window region of the mask layer has a window pattern of a negative type,
Only the Ga-polar light emitting structure is grown on the window region, and only the N-polar light emitting structure is grown on the protruding region, or the Ga-polar light emitting structure and the N-polar light emitting structure are mixed and grown. A light emitting device manufacturing method.
The method of claim 1,
The negative type window pattern has a dot shape, a polygonal shape, an elliptical shape or a stripe shape.
The method of claim 1,
The N-polar light emitting structure formed on the protruding region has a negative pattern (negative pattern).
delete The method of claim 1,
The first electrode and the second electrode is a light emitting device manufacturing method, characterized in that formed to apply a current perpendicular to the light emitting structure.
The method of claim 1,
Wherein the first electrode and the second electrode are formed separately on each of the N-polar light emitting structures.
The method of claim 1,
Selectively etching the Ga-polar light emitting structure,
A method of manufacturing a light emitting device comprising using hydrogen chloride gas (HCl gas).
The method of claim 1,
The active layer is a light emitting device manufacturing method, characterized in that formed in a single quantum well structure (single-quantum well) or multi-quantum well (MQW) structure.
The method of claim 1,
The active layer may include at least one of indium gallium nitride (InGaN), aluminum gallium nitride (AlGaN), gallium nitride (GaN), and aluminum indium gallium nitride (AlInGaN). Light emitting device manufacturing method comprising a.
The method of claim 1,
The growth substrate may include at least one of sapphire, gallium arsenide (GaAs), spinel, spinel, silicon (Si), indium phosphide (InP), and silicon carbide (SiC). Light emitting device manufacturing method characterized in that one.
The method of claim 1,
The mask layer includes at least one of silicon oxide (SiO ₂ ), silicon nitride (SiNx) and silicon oxynitride (SiON).
The method of claim 1,
The n-type semiconductor layer may include gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), and aluminum indium gallium nitride (AlInGaN). A light emitting device manufacturing method comprising at least any one of.
The method of claim 1,
The p-type semiconductor layer may be formed of gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), indium nitride (InN), or aluminum nitride (InN). A method of manufacturing a light emitting device comprising at least one of aluminum nitride (AlN) and aluminum indium gallium nitride (AlInGaN).
Forming a mask layer on the growth substrate, the mask layer comprising at least one window region and a protrusion region;
An n-type semiconductor layer including an Ga-polar n-type semiconductor layer and an N-polar n-type semiconductor layer by epitaxial lateral overgrowth (ELOG) on the growth substrate. Forming a;
Selectively etching the Ga-polar n-type semiconductor layer;
Growing an active layer and a p-type semiconductor layer on the N-polar n-type semiconductor layer to form a light emitting structure;
Forming a first electrode on top of the light emitting structure; And
Forming a second electrode on the bottom of the light emitting structure
Including,
And the window region of the mask layer has a window pattern of a negative type.
The method of claim 14,
The negative type window pattern has a dot shape, a polygonal shape, an elliptical shape or a stripe shape.
Forming a mask layer on the growth substrate, the mask layer comprising at least one window region and a protrusion region;
An n-type semiconductor layer including an Ga-polar n-type semiconductor layer and an N-polar n-type semiconductor layer by epitaxial lateral overgrowth (ELOG) on the growth substrate. Forming a;
Selectively etching the Ga-polar n-type semiconductor layer;
Laterally growing the N-polar n-type semiconductor layer;
Growing an active layer and a p-type semiconductor layer on the laterally grown N-polar n-type semiconductor layer to form a light emitting structure;
Forming a first electrode on top of the light emitting structure; And
Forming a second electrode on the bottom of the light emitting structure
Including,
And the window region of the mask layer has a window pattern of a negative type.
The method of claim 16,
The negative type window pattern has a dot shape, a polygonal shape, an elliptical shape or a stripe shape.

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