WO2014188879A1 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- WO2014188879A1 WO2014188879A1 PCT/JP2014/062357 JP2014062357W WO2014188879A1 WO 2014188879 A1 WO2014188879 A1 WO 2014188879A1 JP 2014062357 W JP2014062357 W JP 2014062357W WO 2014188879 A1 WO2014188879 A1 WO 2014188879A1
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- Prior art keywords
- wafer
- adhesive layer
- semiconductor wafer
- glass substrate
- semiconductor device
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 118
- 238000004519 manufacturing process Methods 0.000 title claims description 62
- 238000000034 method Methods 0.000 title claims description 52
- 239000000758 substrate Substances 0.000 claims abstract description 151
- 239000012790 adhesive layer Substances 0.000 claims abstract description 133
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims description 73
- 239000010410 layer Substances 0.000 claims description 25
- 239000011521 glass Substances 0.000 abstract description 99
- 230000001678 irradiating effect Effects 0.000 abstract description 8
- 238000005336 cracking Methods 0.000 abstract description 7
- 235000012431 wafers Nutrition 0.000 description 200
- 239000000853 adhesive Substances 0.000 description 26
- 230000001070 adhesive effect Effects 0.000 description 26
- 238000000926 separation method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
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- 238000010438 heat treatment Methods 0.000 description 3
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000004380 ashing Methods 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 239000011229 interlayer Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
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- 239000000969 carrier Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 230000005669 field effect Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
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- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/50—Working by transmitting the laser beam through or within the workpiece
- B23K26/57—Working by transmitting the laser beam through or within the workpiece the laser beam entering a face of the workpiece from which it is transmitted through the workpiece material to work on a different workpiece face, e.g. for effecting removal, fusion splicing, modifying or reforming
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- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
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- H01L2221/68327—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
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- H01L2221/6834—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used to protect an active side of a device or wafer
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- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
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- H01L2221/68386—Separation by peeling
Definitions
- the present invention relates to a method of manufacturing a semiconductor device.
- a front surface element structure and a front surface electrode are formed on the front surface side of a wafer, and the back surface of the wafer is ground to obtain a desired wafer thickness. After thinning down (thinning), a backside device structure is formed on the ground backside of the wafer.
- the wafer is reinforced by a TAIKO (registered trademark) process in which only the central portion of the wafer is machine-ground and thinned while leaving the outer peripheral portion of the wafer as a reinforcing portion (rib portion).
- a wafer support system (WSS) process is known which reduces the thickness of the entire wafer. According to the TAIKO process, since the outer peripheral portion of the wafer is not ground but remains at the original thickness, mechanical strength is maintained and cracking and warpage of the wafer are reduced.
- TAIKO wafer support system
- the wafer can be thinned by bonding the supporting substrate to the wafer with an adhesive and maintaining the mechanical strength of the wafer.
- the material of the adhesive is determined by the resistance to the manufacturing process and the method of peeling the support substrate from the wafer.
- a method of peeling the support substrate from the wafer generally, a method of breaking a chemical bond between the support substrate and the adhesive by laser irradiation is used.
- 17 to 21 are cross-sectional views showing a state in the middle of manufacturing the conventional semiconductor device.
- the front surface process of the wafer 101 is performed, and a front surface element structure (not shown) is formed on the front surface side of the wafer 101.
- an adhesive is applied to the entire front surface of the wafer 101 using a coating machine (coater), and the adhesive layer 102 is formed by curing (curing).
- the glass substrate 103 is attached to the front surface of the wafer 101 on which the adhesive layer 102 is formed.
- the state up to here is shown in FIG.
- the wafer 101 is inverted so that the back surface of the wafer 101 is on top, and the back surface of the wafer 101 is ground and thinned.
- the backside process of the wafer 101 is performed to form a backside element structure (not shown) on the backside of the wafer 101.
- the state up to here is shown in FIG.
- the wafer 101 is inverted so that the back surface of the wafer 101 is downward, and the wafer 101 is attached to the dicing tape 112 fixed by the dicing frame 111 (FIG. 19).
- the laser 113 is irradiated from the glass substrate 103 side to cut the chemical bond between the glass substrate 103 and the adhesive layer 102 (FIG. 20).
- the adhesive layer 102 is removed by a solvent or the like.
- the wafer 101 is cut into individual chips 104 by the dicing blade 114, whereby the chips 104 on which thin semiconductor devices are formed are completed (FIG. 21).
- a method of degenerating the separation layer by irradiating the separation layer with light through see, for example, Patent Document 1 below.
- a light-transmitting support As another method, a light-transmitting support, a supported substrate supported by the support, an adhesive layer provided on the side of the supported substrate supported by the support, and the support And a separation layer made of an inorganic material provided between the support substrate and the support substrate, wherein the separation method separates the support substrate and the support from each other via the support.
- a method of altering the separation layer by irradiating light has been proposed (see, for example, Patent Document 2 below).
- an infrared-transparent support a support substrate supported by the support, an adhesive layer bonding the support and the support substrate, and the support substrate in the support are included.
- a method for separating a laminate from a substrate in a laminate comprising: a separation layer provided on the surface of the side to be bonded and formed of a compound having an infrared absorbing structure;
- a method has been proposed in which the compound is changed by irradiating the separation layer with infrared light through the support (see, for example, Patent Document 3 below).
- the upper and lower end portions (corners: hereinafter referred to as chamfers) 103b are chamfered so that chipping and the like do not occur on the outer peripheral end of the side surface 103a of the glass substrate 103 used in the WSS process.
- the laser 113a incident from the chamfered portion 103b has a shape of the chamfered portion 103b, for example, C ( It refracts according to the angle of C: chamfer) plane and the curvature radius of R (R: radius) plane.
- C It refracts according to the angle of C: chamfer
- R radius
- the laser 113 incident from the chamfered portion 103 b is refracted, scattered and reflected, whereby the laser 113 is sufficiently in the interface between the glass substrate 103 and the adhesive layer 102 on the outer peripheral end side of the glass substrate 103. It will be in the state where it is not irradiated. Therefore, when the adhesive layer 102 is formed extending from the portion sandwiched between the wafer 101 and the glass substrate 103 to the chamfered portion 103b and the side surface 103a of the glass substrate 103, the chamfered portion indicated by the arrow 102a in FIG. Since the laser 113 is not irradiated to the adhesive layer 102 covering the 103 b, there arises a problem that the glass substrate 103 is difficult to peel off from the wafer 101 or can not be peeled off.
- FIG. 16 is a cross-sectional view showing the wafer after thinning in FIG. As shown in FIG. 16, the entire chamfered portion 101b of the wafer 101 is not covered by the adhesive layer 102, so that after the wafer 101 is thinned, a pointed portion formed by the chamfered portion 101b and the back surface 101d ground.
- An object of the present invention is to provide a method of manufacturing a semiconductor device capable of easily peeling off a support substrate bonded to a wafer, in order to solve the above-mentioned problems of the prior art. Further, the present invention provides a method of manufacturing a semiconductor device capable of preventing chipping and cracking of a wafer when performing each process on a wafer having a support substrate attached to each other, in order to solve the above-mentioned problems of the prior art. The purpose is to
- a method of manufacturing a semiconductor device has the following features. First, an adhesive layer forming step of forming an adhesive layer on the first main surface of the semiconductor wafer so that the outer peripheral side protrudes more than the central side is performed. Next, a support substrate is bonded to the first main surface of the semiconductor wafer via the adhesive layer so that the adhesive layer covers the side surfaces of the semiconductor wafer.
- corner portions of a surface and a side surface facing the first main surface of the semiconductor wafer are chamfered. Then, in the bonding step, an inner side of the chamfered portion of the support substrate is covered with the adhesive layer.
- the semiconductor wafer is chamfered at corner portions between the first main surface and the side surface of the semiconductor wafer.
- the second main surface of the semiconductor wafer is ground until the chamfered portion of the semiconductor wafer is reached, and a thinning step of thinning the thickness of the semiconductor wafer is further performed.
- the adhesive layer covering the side surface of the semiconductor wafer is expanded so that the adhesive layer remains on the entire surface of the chamfered portion of the semiconductor wafer after the thinning step.
- corner portions of a surface and a side surface facing the first main surface of the semiconductor wafer are chamfered.
- a removal step of removing the adhesive layer covering an outer portion from the chamfered portion of the support substrate is further performed.
- the semiconductor wafer is chamfered at corner portions between the first main surface and the side surface of the semiconductor wafer.
- the second main surface of the semiconductor wafer is ground until the chamfered portion of the semiconductor wafer is reached, and a thinning step of thinning the thickness of the semiconductor wafer is further performed.
- the adhesive layer is removed such that the adhesive layer covering the portion from the first main surface of the semiconductor wafer whose thickness is reduced by the thinning step to the chamfered portion remains.
- the structure forming step is further performed.
- the adhesion area between the support substrate and the adhesive layer is reduced so that the outer peripheral position of the adhesive layer is located outside the outer peripheral position of the semiconductor wafer.
- the chamfered portion of the support substrate is obtained by setting the adhesive layer not to be formed on the portion other than the first surface of the support substrate.
- the laser can be sufficiently irradiated to the outer peripheral end of the adhesive layer by the laser irradiation from the second surface of the support substrate without irradiating the laser. Thereby, all bonds between the adhesive layer and the support substrate can be cut.
- the semiconductor wafer when the semiconductor wafer and the support substrate are bonded by the adhesive layer, the semiconductor wafer is thinned after the semiconductor wafer is thinned by forming the adhesive layer from the first main surface to the side surface of the semiconductor wafer.
- the sharp edge formed at the outer peripheral edge of the wafer is protected by the adhesive layer. Therefore, it is possible to prevent application of stress to the pointed portion of the outer peripheral end of the semiconductor wafer in the subsequent steps.
- the method of manufacturing a semiconductor device of the present invention it is possible to easily peel off the support substrate bonded to the wafer. Further, according to the method of manufacturing a semiconductor device according to the present invention, when performing each process on a wafer to which a support substrate is bonded, it is possible to prevent chipping and cracking of the wafer.
- FIG. 1 is a flowchart showing an outline of a method of manufacturing a semiconductor device according to the first embodiment.
- FIG. 2 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG.
- FIG. 3 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG.
- FIG. 4 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG.
- FIG. 5 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG.
- FIG. 6 is a flowchart showing an outline of a method of manufacturing a semiconductor device according to the second embodiment.
- FIG. 7 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG.
- FIG. 8 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG.
- FIG. 9 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG.
- FIG. 10 is a cross-sectional view showing a state during manufacture of the semiconductor device of Comparative Example 1.
- FIG. 11 is a flowchart showing an outline of a method of manufacturing a semiconductor device according to the third embodiment.
- FIG. 12 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG. FIG.
- FIG. 13 is a cross-sectional view showing a state in the middle of manufacture in the flowchart shown in FIG.
- FIG. 14 is a cross-sectional view showing a state during manufacture of the semiconductor device of Comparative Example 2.
- FIG. 15 is a cross-sectional view showing an example of a semiconductor device manufactured by the method of manufacturing a semiconductor device according to the present invention.
- FIG. 16 is a cross-sectional view showing the wafer after thinning in FIG.
- FIG. 17 is a cross-sectional view showing a state in the middle of manufacturing the conventional semiconductor device.
- FIG. 18 is a cross-sectional view showing a state in the middle of manufacturing the conventional semiconductor device.
- FIG. 19 is a cross-sectional view showing a state in the middle of manufacturing the conventional semiconductor device.
- FIG. 20 is a cross-sectional view showing a state in the middle of manufacturing the conventional semiconductor device.
- FIG. 21 is a cross-sectional view showing a state in the middle of manufacturing the conventional semiconductor device.
- n and p in the layer or region having n or p, it is meant that electrons or holes are majority carriers, respectively.
- + and-attached to n and p mean that the impurity concentration is higher and the impurity concentration is lower than that of the layer or region to which it is not attached, respectively.
- FIG. 1 is a flowchart showing an outline of a method of manufacturing a semiconductor device according to the first embodiment.
- 2 to 5 are cross-sectional views showing the state in the middle of manufacture in the flowchart shown in FIG.
- a general front surface process of the wafer 1 is performed to form a front surface element structure (not shown) on the front surface (first main surface) 1c side of the wafer 1 (step S1).
- the adhesive 2 is applied to the entire front surface 1c of the wafer 1 using a coater (coater) (step S2).
- a spin method is used in which the wafer 1 fixed on the stage is rotated at high speed, and the adhesive 2 dropped on the front surface 1c of the wafer 1 is stretched by centrifugal force.
- the outer peripheral end of the wafer 1 is chamfered at its upper and lower end (corner: hereinafter referred to as a chamfer) 1b so that chipping and the like do not occur.
- the chamfered portion 1b of the wafer 1 may be, for example, a C-face having a chamfering angle of 45 °, a face having a chamfering angle other than 45 °, or an R-face having a curvature.
- the outer peripheral end portion of the wafer 1 has, for example, a tapered shape whose thickness is thinner than that of the central portion side, or an arc shape having a curvature.
- the case where the outer peripheral end of the wafer 1 has a tapered shape will be described as an example.
- the side surface 1 a of the wafer 1 is a flat surface substantially perpendicular to the front surface 1 c of the wafer 1.
- the outer peripheral end of the wafer 1 is a tapered portion formed by the side surface 1 a of the wafer 1 and the chamfered portion 1 b.
- the adhesive 2 preferably has a suitable viscosity and is dropped onto the wafer 1 in a liquid state.
- the adhesive 2 for example, a polyimide-based or acrylic-based adhesive may be used.
- the reason for dropping in the liquid state is that the surface element structure is formed on the front surface 1 c of the wafer 1, and the unevenness of about 10 ⁇ m to 15 ⁇ m is generated, and the front surface 1 c of the wafer 1 is This is to prevent the surface of the adhesive 2 from being uneven due to the unevenness.
- the thickness of the adhesive 2 in the vicinity of the central portion of the wafer 1 may be, for example, about 20 ⁇ m when the entire surface of the front surface 1 c of the wafer 1 is coated by high speed rotation of the wafer 1.
- the adhesive 2 since the adhesive 2 has viscosity, the outer peripheral end 2 a of the adhesive 2 protrudes thicker than the central portion side of the wafer 1 due to the centrifugal force caused by the high speed rotation of the wafer 1.
- the adhesive 2 is cured (cured) in this state to form an adhesive layer (hereinafter referred to as the adhesive layer 2) over the entire front surface 1c of the wafer 1 (step S3).
- the adhesive layer 2 is formed such that the outer peripheral side protrudes more than the central side.
- the adhesive layer 2 may be formed up to the chamfered portion 1 b or the side surface 1 a of the wafer 1. The situation up to here is shown in FIG.
- the glass substrate 3 is bonded to the front surface 1c of the wafer 1 on which the adhesive layer 2 is formed (step S4). That is, the wafer 1 is reinforced by the glass substrate 3 to improve the mechanical strength of the wafer 1 (WSS process).
- the wafer 1 and the glass substrate 3 are heated while heating them in a vacuum atmosphere. Apply pressure in the direction of pressing on the adhesive layer 2 side. Since the adhesive 2 is softened between the wafer 1 and the glass substrate 3 by heating, pressure is applied to deform the adhesive layer 2, and the protruding portion of the outer peripheral portion of the adhesive layer 2 is pushed out to the outside. Cover 1 side 1a.
- the adhesive layer 2 covers the front surface 1 c to the side surface 1 a of the wafer 1. Further, the adhesive layer 2 covers the inside of the glass substrate 3, which will be described later, on the inner side than a chamfered portion 3 b.
- the adhesive 2 is cured again in this state, and the wafer 1 and the glass substrate 3 are bonded to each other. The state up to here is shown in FIG.
- upper and lower ends (corners: hereinafter referred to as chamfers) 3b of the side surface 3a are chamfered so as to prevent chipping and the like.
- the chamfered portion 3b of the glass substrate 3 may be, for example, a C surface having a chamfering angle of 45 °, a surface having a chamfering angle other than 45 °, or an R surface having a curvature.
- the outer peripheral end portion of the glass substrate 3 has, for example, a tapered shape whose thickness is thinner than that of the central portion side, or an arc shape having a curvature.
- the side surface 3 a of the glass substrate 3 is a flat surface substantially perpendicular to a flat surface (hereinafter referred to as a first surface) 3 c of the glass substrate 3 facing the wafer 1.
- the outer peripheral end of the glass substrate 3 is a tapered portion formed by the side surface 3 a of the glass substrate 3 and the chamfered portion 3 b.
- the glass substrate 3 a substrate which has a transmittance that allows the laser to pass through in laser irradiation described later and is not damaged by the laser irradiation is used.
- the glass substrate 3 may have a transmittance of about 40% to the laser.
- the glass substrate 3 may be made of boric acid-based glass.
- the diameter of the glass substrate 3 is approximately the same size as the diameter of the wafer 1 and preferably has a radius that is, for example, about 0.25 mm larger than the radius of the wafer 1.
- the reason why the diameter of the glass substrate 3 is substantially the same as the diameter of the wafer 1 is that the wafer process can be efficiently performed by the existing equipment and the existing wafer process.
- the reason why the radius of the glass substrate 3 is made larger than the radius of the wafer 1 is because it is easy to realize the end shape of the adhesive layer 2 as described later.
- the adhesive layer 2 covers from the front surface 1 c of the wafer 1 to the chamfered portion 1 b and the side surface 1 a of the wafer 1 on the wafer 1 side. Further, the adhesive layer 2 is formed on the first surface 3 c of the glass substrate 3 on the glass substrate 3 side, and is not formed on the chamfered portion 3 b and the side surface 3 a of the glass substrate 3. That is, the outer peripheral end 2 b of the adhesive layer 2 is positioned on the side surface 1 a of the wafer 1 on the wafer 1 side, and positioned on the first surface 3 c of the glass substrate 3 on the glass substrate 3 side. Specifically, the shape of the outer peripheral end 2 b of the adhesive layer 2 is a tapered shape that spreads from the side surface 1 a of the wafer 1 toward the first surface 3 c of the glass substrate 3.
- step S4 The position of the outer peripheral end 2b of the adhesive layer 2 is determined by the amount of wrap around the adhesive layer 2 on the side surface 1a of the wafer 1 when the wafer 1 and the glass substrate 3 are bonded in step S4. Therefore, in step S4, for example, it is preferable to spread the adhesive layer 2 covering the side surface 1a of the wafer 1 so that the adhesive layer 2 remains on the entire surface of the chamfered portion 1b of the wafer 1 after the thinning step described later. Further, in step S4, by bonding the wafer 1 and the glass substrate 3 in a vacuum atmosphere, it is possible to suppress the bubbles from remaining in the adhesive layer 2.
- the wraparound amount of the adhesive layer 2 to the outer peripheral end of the wafer 1 in step S4 is, for example, the viscosity of the adhesive layer 2 before curing (adhesive) or the number of rotations when applying the adhesive in step S2 (ie, The thickness of the outer peripheral edge 2a of the adhesive), the conditions for curing the adhesive in step S3 (ie, the dryness of the adhesive layer 2), and the step of bonding the wafer 1 and the glass substrate 3 in step S4.
- the pressure to be applied may be changed in various ways. For example, in order to adjust the degree of dryness of the adhesive layer 2, the process of step S2 may be performed in a sealed space so that the adhesive applied to the wafer 1 does not come into contact with the air.
- the adhesive layer 2 preferably has heat resistance in a high temperature process by a back surface side process described later or the like.
- the wafer 1 is inverted to place the back surface of the wafer 1 up.
- the back surface of the wafer 1 is ground by back grinding or the like to reduce the thickness of the wafer 1 to, for example, about 50 ⁇ m (step S5).
- a general backside process of the wafer 1 is performed to form a backside element structure (not shown) on the backside 1 d of the wafer 1 (step S6).
- the thinning of the wafer 1 may be, for example, chemical mechanical polishing (CMP) using a grinder, or dissolution by etching.
- CMP chemical mechanical polishing
- the wafer 1 is made of, for example, silicon carbide (SiC) as a semiconductor material, the SiC wafer is not melted, and thus it is preferable to thin it by CMP. The situation up to here is shown in FIG.
- step S5 the outer peripheral end of the wafer 1 has a blade-like shape (knife edge) due to the chamfered portion 1b and the back surface 1d ground, but the outer peripheral end 2b of the adhesive layer 2 is the wafer 1 in step S4. Since the side surface 1a is reached, the entire chamfered portion 1b of the wafer 1 is covered by the adhesive layer 2 even after the wafer 1 is thinned. As a result, the pointed portion 1 e at the outer peripheral end of the wafer 1 is embedded in the adhesive layer 2 and is not exposed.
- thickness t in the direction parallel to the main surface of wafer 1 of outer peripheral end 2 b of adhesive layer 2 in pointed portion 1 e of outer peripheral end of wafer 1 is the outer peripheral end of wafer 1.
- Any thickness that can maintain the mechanical strength of the pointed portion 1e is preferable, and preferably the thickness is thin enough to allow the glass substrate 3 to be easily peeled off in the process of peeling the glass substrate 3 described later. Is good.
- the wafer 1 is inverted so that the back surface 1d of the wafer 1 is on the bottom, and the wafer 1 is attached to the dicing tape 12 fixed by the dicing frame 11 (step S7).
- the laser 13 is irradiated from the side of the glass substrate 3 to cut the chemical bond between the glass substrate 3 and the adhesive layer 2, and the glass substrate 3 is peeled off from the adhesive layer 2 (step S8). The state up to here is shown in FIG.
- the chamfered portion 3 b and the side surface 3 a of the glass substrate 3 are not covered by the adhesive layer 2, even when the laser 13 irradiated from the chamfered portion 3 b of the glass substrate 3 is refracted, scattered or reflected when irradiating the laser 13,
- the laser 13 can be irradiated on the entire interface between the substrate 3 and the adhesive layer 2.
- FIG. 5 illustrates the case where only the interface between the glass substrate 3 and the adhesive layer 2 is irradiated with the laser 13, the glass substrate 3 can be obtained by using the dicing tape 12 resistant to the laser 13 irradiation.
- the laser 13 can be irradiated to a wider range than the area of the interface between the adhesive layer 2 and the adhesive layer 2.
- a laser having a wavelength that transmits through the glass substrate 3 and is not absorbed by the adhesive layer 2 is used.
- a YAG laser having a short wavelength may be used as the laser 13.
- the adhesive layer 2 is removed (step S9).
- the adhesive layer 2 may be removed by peeling the seal-like adhesive layer 2 from the glass substrate 3, or the adhesive layer 2 may be removed by dissolving the adhesive layer 2 with a solvent or the like.
- the wafer 1 is cut by a general dicing process, that is, a dicing blade (step S10), whereby a chip on which a thin semiconductor device is formed is completed.
- the adhesive layer when the laser irradiation for peeling the glass substrate from the adhesive layer, the adhesive layer is not formed on the chamfered portion and the side surface of the glass substrate,
- the laser can be sufficiently irradiated to the outer peripheral end of the adhesive layer by the laser irradiation from the flat surface (second surface) of the glass substrate without irradiating the laser from the chamfered portion of the glass substrate.
- the glass substrate can be easily peeled off from the adhesive layer.
- the adhesive layer is formed extending from the front surface of the wafer to the chamfered portion and the side surface.
- the sharpened portion formed at the outer peripheral edge of the wafer after thinning is protected by the adhesive layer covering the chamfer of the wafer. Therefore, it is possible to prevent application of stress to the pointed portion of the outer peripheral end of the wafer in the subsequent steps. Therefore, chipping (chipping) or cracking of the wafer can be prevented.
- FIG. 6 is a flowchart showing an outline of a method of manufacturing a semiconductor device according to the second embodiment.
- 7 to 9 are cross-sectional views showing a state in the middle of manufacture in the flowchart shown in FIG.
- the difference between the method of manufacturing a semiconductor device according to the second embodiment and the method of manufacturing a semiconductor device according to the first embodiment is that the step of removing an extra portion of the adhesive layer 22 between step S5 and step S6 It is the point which added step S21).
- bonding is performed when wafer 1 and glass substrate 3 are bonded together and covered with chamfered portion 3b and side surface 3a of glass substrate 3 by the protruding portion of the outer peripheral portion of bonding layer 22. Remove excess of layer 22
- steps S1 to S5 are performed.
- steps S21 portions of the adhesive layer 22 covering the chamfered portion 3b and the side surface 3a of the glass substrate 3 are removed.
- steps S6 to S10 a chip on which a thin semiconductor device is formed is completed.
- the wafer 1 is thinned (step S5), and then the wafer 1 Before the rear surface side process (step S6), the end shape of the adhesive layer 22 is appropriately adjusted by step S21 (FIG. 8).
- step S21 the excess portion (the portion covering the chamfered portion 3b and the side surface 3a of the glass substrate 3) of the outer peripheral end 22b-1 of the adhesive layer 22 is removed by dissolution with a solvent or ashing (ashing). Further, in step S21, the outer peripheral end of the adhesive layer 22 is retreated inward to such an extent that the sharp portion 1e produced at the outer peripheral end of the wafer 1 is not exposed after the wafer 1 is thinned.
- a state in which the outer peripheral end 22b-1 of the adhesive layer 22 reaches the chamfered portion 3b and the side surface 3a of the glass substrate 3 is shown in FIG.
- the state where the portion covering the chamfered portion 3b and the side surface 3a of the glass substrate 3 of the adhesive layer 22 is removed is shown in FIG.
- the outer peripheral end 22b-2 of the adhesive layer 22 covers the entire chamfered portion 1b of the wafer 1 and does not cover the chamfered portion 3b and the side surface 3a of the glass substrate 3. Therefore, as in the first embodiment, the laser 13 can be irradiated to the entire interface between the glass substrate 3 and the adhesive layer 22 by the laser 13 irradiation.
- the state up to here is shown in FIG.
- reference numeral 3 d is a second surface of the glass substrate 3.
- step S5 it is preferable to grind the wafer 1 in a state in which the side surface 1a of the wafer 1 is covered by the adhesive layer 22.
- step S21 is performed before step S5, the adhesive layer 22 is removed to the portion covering the chamfered portion 1b and the side surface 1a of the wafer 1 by the process of step S21, and then the process of step S5 can be performed. There is sex. For this reason, the process of step S21 is preferably performed after the process of step S5.
- FIG. 10 is a cross-sectional view showing a state during manufacture of the semiconductor device of Comparative Example 1.
- the outer peripheral end 22b-1 of the adhesive layer 22 is removed too much in step S21, as shown in FIG. 10, only a part of the chamfered portion 1b of the wafer 1 is covered by the outer peripheral end 22b-3 of the adhesive layer 22.
- the sharp portion 1e of the outer peripheral end of the wafer 1 is exposed (the portion indicated by reference numeral 20). For this reason, it is not preferable because it causes chipping or cracking in the wafer 1 at the pointed portion 1 e of the outer peripheral end of the wafer 1 in the subsequent steps.
- the adhesive layer covers the chamfered portion and the side surface of the glass substrate to remove it. The same effect as in the first aspect can be obtained.
- FIG. 11 is a flowchart showing an outline of a method of manufacturing a semiconductor device according to the third embodiment.
- 12 and 13 are cross-sectional views showing a state in the middle of manufacture in the flowchart shown in FIG.
- the difference between the method of manufacturing a semiconductor device according to the third embodiment and the method of manufacturing a semiconductor device according to the first embodiment is that the step of removing an extra portion of the adhesive layer 32 between step S6 and step S7 Step S31) is added.
- the wafer 1 and the glass substrate 3 are bonded together, and the chamfered portion 3b and the side surface 3a of the glass substrate 3 are formed by the protruding portion of the outer peripheral portion of the adhesive layer 32. When covered up, the excess part of the adhesive layer 32 is removed.
- step S31 the portion of the adhesive layer 32 covering the chamfered portion 1b of the wafer 1 and the portion covering the chamfered portion 3b and the side surface 3a of the glass substrate 3 are removed.
- the method for selectively removing the adhesive layer 32 in step S31 is the same as that of the second embodiment.
- steps S7 to S10 are performed.
- a chip on which a thin semiconductor device is formed is completed.
- the outer peripheral end 32b of the adhesive layer 32 reaches the chamfered portion 3b or the side surface 3a of the glass substrate 3 (see, for example, FIG. 7)
- glass is processed after the back surface side step (step S6) of the wafer 1 Before peeling of the substrate 3 (step S8), the end shape of the adhesive layer 32 is appropriately adjusted in step S31 (FIG. 12).
- step S31 the adhesive layer is positioned such that the outer peripheral position 32c-1 of the outer peripheral end 32b of the adhesive layer 32 is positioned outside the sharpened portion 1e formed on the outer peripheral end of the wafer 1 after the wafer 1 is thinned.
- An extra portion of the outer peripheral end 32b 32 (a portion covering the chamfered portion 3b and the side surface 3a of the glass substrate 3) is removed. If the outer peripheral position 32c-1 of the outer peripheral end 32b of the adhesive layer 32 is located within the above range, the outer peripheral portion of the front surface 1c of the wafer 1 may be exposed to some extent.
- the state where the portion covering the chamfered portion 3b and the side surface 3a of the glass substrate 3 is removed is shown in FIG.
- the bonding area between the glass substrate 3 and the adhesive layer 32 is reduced. Therefore, as in the first embodiment, the laser 13 can be irradiated to the entire interface between the glass substrate 3 and the adhesive layer 32 by the laser 13 irradiation. Further, the outer peripheral position 32c-1 of the outer peripheral end 32b of the adhesive layer 32 is positioned outside the pointed portion 1e of the outer peripheral end of the wafer 1, so that the wafer 13 is irradiated with the laser 13 in the step S8. Can be prevented. The state up to here is shown in FIG.
- FIG. 14 is a cross-sectional view showing a state during manufacture of the semiconductor device of Comparative Example 2.
- the outer peripheral position 32 c-2 of the outer peripheral end 32 b of the adhesive layer 32 is more inward than the pointed portion 1 e of the outer peripheral end of the wafer 1. (Part indicated by reference numeral 30).
- the laser 13 is irradiated to the wafer 1 when the laser 13 for peeling the glass substrate 3 is irradiated in the process of step S8, which is not preferable because it causes the wafer 1 to be damaged.
- the portion of the adhesive layer covering the chamfered portion and the side surface of the glass substrate is removed before the laser irradiation for peeling the glass substrate from the adhesive layer is performed.
- the same effect as that of the first embodiment can be obtained.
- the mechanical strength of the wafer can be secured in the back surface side process of the wafer, and when peeling the glass substrate from the adhesive layer. Can reduce the bonding area between the bonding layer and the glass substrate. Therefore, chipping and cracking of the wafer can be prevented, and the glass substrate can be easily peeled off from the adhesive layer.
- FIG. 15 is a cross-sectional view showing an example of a semiconductor device manufactured by the method of manufacturing a semiconductor device according to the present invention.
- n consists of the wafer 1 - Contact formed by the semiconductor substrate (chip) 41 Step S1 on the front surface side of the A surface element structure 40 a and a back surface element structure 40 b formed by the step S 6 on the back surface side of the n ⁇ semiconductor substrate 41 are provided.
- the p base region 42 is selectively provided in the surface layer on the front surface of the n ⁇ semiconductor substrate 41 to be the n ⁇ drift region.
- an n + emitter region 43 is selectively provided inside the p base region 42.
- a gate electrode 45 is provided on the surface of a portion of the p base region 42 sandwiched by the n ⁇ drift region and the n + emitter region 43 via a gate insulating film 44.
- Emitter electrode 46 is in contact with p base region 42 and n + emitter region 43 and is electrically isolated from gate electrode 45 by interlayer insulating film 47.
- a p collector layer 48 is provided on the back surface of the n ⁇ semiconductor substrate 41.
- Collector electrode 49 is in contact with p collector layer 48.
- the n - between the drift region and the p-type collector layer 48, p base region 42 and n at the OFF time - n field stop of the depletion layer is prevented from reaching the p-type collector layer 48 extending from the pn junction between the drift region Layer 50 is provided.
- the front surface element structure 40a has a MOS gate (insulated gate made of metal-oxide-semiconductor) structure including the p base region 42, the n + emitter region 43, the gate insulating film 44, and the gate electrode 45; And an electrode 46.
- Back surface element structure 40 b is formed of p collector layer 48, n field stop layer 50 and collector electrode 49.
- the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
- a glass substrate is described as an example, but a support substrate made of another material may be used if mechanical strength of the wafer 1 can be improved and laser can be transmitted.
- the FS type IGBT is illustrated as a semiconductor device manufactured by the method of manufacturing a semiconductor device according to each embodiment, the present invention is not limited to this, and the present invention is also applicable to semiconductor devices of other configurations. .
- the present invention can be applied to IGBTs, reverse blocking (RB) IGBTs, insulated gate field effect transistors (MOSFETs), diodes, Schottky diodes and the like using silicon wafers and SiC wafers. Further, the present invention is similarly applicable to a configuration in which n-type and p-type are inverted.
- the method for manufacturing a semiconductor device according to the present invention is useful for a power semiconductor device used for an ultra thin device such as an IC (Integrated Circuit) device for memory card use.
- IC Integrated Circuit
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Abstract
Description
実施の形態1にかかる半導体装置の製造方法について説明する。図1は、実施の形態1にかかる半導体装置の製造方法の概要を示すフローチャートである。図2~5は、図1に示すフローチャートにおける製造途中の状態を示す断面図である。まず、一般的なウエハ1のおもて面側工程を行い、ウエハ1のおもて面(第1主面)1c側に図示省略するおもて面素子構造を形成する(ステップS1)。次に、塗布機(コーター)を用いて、ウエハ1のおもて面1c全体に接着剤2を塗布する(ステップS2)。ステップS2では、例えば、ステージ上に固定されたウエハ1を高速回転させ、ウエハ1のおもて面1c上に滴下された接着剤2を遠心力によって伸ばすスピン方式を用いる。
次に、実施の形態2にかかる半導体装置の製造方法について説明する。図6は、実施の形態2にかかる半導体装置の製造方法の概要を示すフローチャートである。図7~9は、図6に示すフローチャートにおける製造途中の状態を示す断面図である。実施の形態2にかかる半導体装置の製造方法が実施の形態1にかかる半導体装置の製造方法と異なる点は、ステップS5とステップS6との間に、接着層22の余分な部分を除去する工程(ステップS21)を追加した点である。すなわち、実施の形態2においては、ウエハ1とガラス基板3とを貼り合わせて、接着層22の外周部の突出する部分によってガラス基板3の面取り部3bおよび側面3aまで覆われた場合に、接着層22の余分な部分を除去する。
次に、実施の形態3にかかる半導体装置の製造方法について説明する。図11は、実施の形態3にかかる半導体装置の製造方法の概要を示すフローチャートである。図12,13は、図11に示すフローチャートにおける製造途中の状態を示す断面図である。実施の形態3にかかる半導体装置の製造方法が実施の形態1にかかる半導体装置の製造方法と異なる点は、ステップS6とステップS7との間に、接着層32の余分な部分を除去する工程(ステップS31)を追加した点である。すなわち、実施の形態3においても、実施の形態2と同様に、ウエハ1とガラス基板3とを貼り合わせて、接着層32の外周部の突出する部分によってガラス基板3の面取り部3bおよび側面3aまで覆われた場合に、接着層32の余分な部分を除去する。
1a ウエハの側面
1b ウエハの面取り部
1c ウエハのおもて面
1d ウエハの裏面
1e ウエハの外周端部の尖った部分
2,22,32 接着剤、接着層
2a 接着剤の外周端部
2b,22b-1~22b-3,32b 接着層の外周端部
3 ガラス基板
3a ガラス基板の側面
3b ガラス基板の面取り部
3c ガラス基板の第1の面
3d ガラス基板の第2の面
11 ダイシングフレーム
12 ダイシングテープ
13 レーザー
40a おもて面素子構造
40b 裏面素子構造
41 n-半導体基板
42 pベース領域
43 n+エミッタ領域
44 ゲート絶縁膜
45 ゲート電極
46 エミッタ電極
47 層間絶縁膜
48 pコレクタ層
49 コレクタ電極
50 nフィールドストップ層
Claims (6)
- 半導体ウエハの第1主面に、外周部側が中央部側よりも突出するように接着層を形成する接着層形成工程と、
前記接着層によって前記半導体ウエハの側面まで覆われるように、前記接着層を介して前記半導体ウエハの第1主面に支持基板を貼り合わせる貼り合わせ工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記支持基板は、前記半導体ウエハの第1主面に対向する面と側面との角部が面取りされており、
前記貼り合わせ工程では、前記接着層によって前記支持基板の前記面取りされた部分よりも内側が覆われることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記半導体ウエハは、前記半導体ウエハの第1主面と側面との角部が面取りされており、
前記支持基板に貼り合わされた状態で、前記半導体ウエハの前記面取りされた部分に達するまで前記半導体ウエハの第2主面を研削し、前記半導体ウエハの厚さを薄くする薄化工程をさらに含み、
前記貼り合わせ工程では、前記薄化工程後の前記半導体ウエハの前記面取りされた部分全面に前記接着層が残るように、前記半導体ウエハの側面を覆う前記接着層を拡げることを特徴とする請求項1または2に記載の半導体装置の製造方法。 - 前記支持基板は、前記半導体ウエハの第1主面に対向する面と側面との角部が面取りされており、
前記貼り合わせ工程後、前記支持基板の前記面取りされた部分から外側の部分を覆う前記接着層を除去する除去工程をさらに含むことを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記半導体ウエハは、前記半導体ウエハの第1主面と側面との角部が面取りされており、
前記支持基板に貼り合わされた状態で、前記半導体ウエハの前記面取りされた部分に達するまで前記半導体ウエハの第2主面を研削し、前記半導体ウエハの厚さを薄くする薄化工程をさらに含み、
前記除去工程では、前記薄化工程によって厚さが薄くなった前記半導体ウエハの第1主面から前記面取りされた部分までを覆う前記接着層が残るように、前記接着層を除去することを特徴とする請求項4に記載の半導体装置の製造方法。 - 前記除去工程前に、前記薄化工程によって厚さが薄くなった前記半導体ウエハの第2主面に素子構造を形成する素子構造形成工程をさらに含み、
前記除去工程では、前記接着層の外周位置が前記半導体ウエハの外周位置よりも外側に位置するように、前記支持基板と前記接着層との接着面積を低減することを特徴とする請求項5に記載の半導体装置の製造方法。
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