WO2013031596A1 - 温度測定用板状体及びそれを備えた温度測定装置 - Google Patents
温度測定用板状体及びそれを備えた温度測定装置 Download PDFInfo
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- WO2013031596A1 WO2013031596A1 PCT/JP2012/071165 JP2012071165W WO2013031596A1 WO 2013031596 A1 WO2013031596 A1 WO 2013031596A1 JP 2012071165 W JP2012071165 W JP 2012071165W WO 2013031596 A1 WO2013031596 A1 WO 2013031596A1
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- Prior art keywords
- temperature
- wafer
- temperature measurement
- plate
- electrostatic chuck
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- 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
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67248—Temperature monitoring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0233—Industrial applications for semiconductors manufacturing
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
- H05B3/265—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an inorganic material, e.g. ceramic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- 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
- H01L21/6831—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 electrostatic chucks
- H01L21/6833—Details of electrostatic chucks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
Definitions
- the present invention relates to a temperature-measuring plate-like body and a temperature-measuring device provided with the same, and more specifically, in-plane on a placement surface of an electrostatic chuck device for placing a plate-like sample such as a semiconductor wafer in a semiconductor manufacturing process.
- the present invention relates to a temperature measurement plate that can easily and in real time evaluate temperature distribution, temperature rise characteristics, and cooling characteristics during temperature drop, and a temperature measurement apparatus including the same.
- the etching technique is an important one of the microfabrication techniques.
- the plasma etching technique capable of high-efficiency and large-area microfabrication has become the mainstream among the etching techniques. .
- an electrostatic chuck apparatus has been used as an apparatus for simply mounting and fixing a wafer on a sample stage and maintaining the wafer at a desired temperature. Yes.
- thermocouple hot junctions are bonded to each of the plurality of recesses scattered on the wafer surface with heat-resistant cement.
- the wafer with the temperature sensor is placed on the mounting surface of the electrostatic chuck device.
- a method has been adopted in which the temperature of the wafer is measured in real time with a temperature sensor while the mounted electrostatic chuck device is passed through the semiconductor manufacturing line.
- An object of the present invention is to provide a temperature-measuring plate-like body capable of easily optimizing the in-plane temperature distribution, temperature rise characteristics, and cooling characteristics at the time of temperature fall of the mounting surface, and a temperature measurement apparatus including the same. .
- the present inventors have provided a heating member on one main surface of the plate-like body placed on the placement surface of the electrostatic chuck device, and If a temperature measurement area for measuring the temperature of this plate-like body is provided in the area excluding the heating member on the surface, the actual temperature of this temperature measurement area, that is, the actual surface temperature of the plate-like body, is measured.
- thermocouples It can be measured in real time using non-contact temperature measuring devices such as graphs, optical thermometers, radiation thermometers, etc., or contact temperature measuring devices such as thermocouples, and therefore the surface on the mounting surface of the electrostatic chuck device.
- non-contact temperature measuring devices such as graphs, optical thermometers, radiation thermometers, etc.
- contact temperature measuring devices such as thermocouples
- the plate for temperature measurement according to the present invention is provided with a heating member on one main surface of the plate-like body, and the plate-like body in a part of the region excluding the heating member on the one main surface.
- a temperature measurement region for measuring the temperature of the substrate is provided.
- the temperature measurement plate is mounted on the mounting surface of the electrostatic chuck device, and is heated using a heating member provided on the temperature measurement plate.
- a heating member provided on the temperature measurement plate.
- the actual temperature in the temperature measurement region can be measured in real time using a non-contact temperature measuring device such as a thermograph, an optical thermometer, or a radiation thermometer.
- a non-contact temperature measuring device such as a thermograph, an optical thermometer, or a radiation thermometer.
- the heating member is a metal foil, and the metal foil is bonded to the one main surface via an insulating adhesive.
- the heating member is a metal foil, and the heat transfer coefficient between the heating member and the plate is obtained by adhering the metal foil to one main surface via an insulating adhesive. Is constant.
- the plate is made of any one of silicon, silicon carbide, silicon nitride, a group III-V compound semiconductor, and a group II-VI compound semiconductor.
- a semiconductor wafer as a product is obtained by using any one of silicon, silicon carbide, silicon nitride, III-V compound semiconductor, and II-VI compound semiconductor as the plate. It is possible to obtain evaluation on the mounting surface of the electrostatic chuck device equivalent to the case where it is used.
- the heating member is covered with an insulating film.
- the insulating property of the heating member is maintained well.
- temperature measurement using a thermograph becomes possible by covering with an insulating film.
- the insulating adhesive includes any one of an acrylic adhesive, an epoxy adhesive, and a polyimide amide adhesive.
- the insulating adhesive includes any one of an acrylic adhesive, an epoxy adhesive, and a polyimide amide adhesive. The stress during the process is relaxed, and there is no possibility that the heating member peels off from the plate-like body.
- thermocouple is connected to the temperature measurement region.
- the actual temperature in the temperature measurement region can be directly measured in real time using the thermocouple.
- the actual surface temperature in the temperature measurement region of the plate-like body can be accurately measured in real time.
- the temperature measuring device of the present invention includes the temperature measuring plate according to the present invention.
- this temperature measuring apparatus by providing the temperature measuring plate according to the present invention, the in-plane temperature distribution on the mounting surface of the electrostatic chuck apparatus, the temperature rise characteristics, and the cooling characteristics during the temperature fall can be simplified in real time. It becomes possible to evaluate.
- a heating member is provided on one main surface of the plate-like body, and the temperature of the plate-like body is set in a region excluding the heating member on the one main surface. Since a temperature measurement region for measurement is provided, a heating member incorporating the temperature measurement plate is used in a state where the temperature measurement plate is mounted on the mounting surface of the electrostatic chuck device. By heating, the actual temperature in the temperature measurement region can be measured in real time using a non-contact temperature measuring device such as a thermograph, an optical thermometer, or a radiation thermometer.
- the actual surface temperature of this temperature measurement region can be measured in real time, and the in-plane temperature distribution on the mounting surface of the electrostatic chuck device, the temperature rise characteristics, and the cooling characteristics during the temperature fall can be simplified based on the measured values. Moreover, it can be evaluated in real time.
- the temperature measuring plate-shaped body of the present invention since the temperature measuring plate-shaped body of the present invention is provided, an in-plane temperature distribution or temperature rise on the mounting surface of the electrostatic chuck device using the temperature measuring plate-shaped body. It is possible to easily evaluate the characteristics and the cooling characteristics when the temperature is lowered in real time.
- FIG. 2 is a cross-sectional view taken along line AB of FIG. It is a schematic diagram which shows the temperature measuring apparatus provided with the plate-shaped body for temperature measurement of the 1st Embodiment of this invention. It is sectional drawing which shows the plate-shaped body for temperature measurement of the 2nd Embodiment of this invention.
- FIG. 1 is a plan view showing a temperature measurement wafer (temperature measurement plate) according to the first embodiment of the present invention
- FIG. 2 is a cross-sectional view taken along the line AB of FIG.
- an insulating adhesive 3 is attached to the entire surface (one main surface) 2 a of a wafer (plate-like body) 2, and a substantially meandering predetermined predetermined shape is formed on the insulating adhesive 3.
- a heater element (heating member) 4 having a pattern is provided.
- a substantially circular temperature measuring region 5 for measuring the temperature of the surface 2a of the wafer 2 is provided in a predetermined portion (part) of the region excluding the heater element 4 on the surface 3a of the insulating adhesive 3. Is provided.
- heater element 4 and temperature measurement region 5 are covered with an insulating film 6 having an infrared transmittance of 80% or less.
- 11 and 12 are voltage application electrodes provided at both ends of the heater element 4, and 13 is a notch for positioning the wafer 2.
- the wafer 2 is a plate-like sample such as a semiconductor wafer to be a product, and it is preferable to use a plate-like sample flowing in an actual semiconductor production line as it is.
- the wafer 2 include silicon wafers, SiC (silicon carbide) wafers, Si 3 N 4 (silicon nitride) wafers, III-V compound semiconductor wafers such as GaAs and GaAsN, and II-VI compound semiconductors such as ZnSe.
- a wafer etc. are mentioned, and it selects and uses suitably according to the semiconductor wafer used as a product.
- the size and shape of the wafer 2 may be appropriately selected according to the electrostatic chuck device on which the temperature measuring wafer 1 is placed, and is not particularly limited.
- the insulating adhesive 3 is a sheet-like or film-like adhesive having heat resistance and insulating properties, and is mainly composed of any one of an acrylic adhesive, an epoxy adhesive, and a polyimide amide adhesive. It is an adhesive.
- the thickness of the insulating adhesive 3 is preferably 5 ⁇ m or more and 100 ⁇ m or less, more preferably 15 ⁇ m or more and 50 ⁇ m or less.
- the in-plane thickness variation of the insulating adhesive 3 is preferably within 10% of the thickness.
- the in-plane thickness of the insulating adhesive 3 exceeds 10%
- the in-plane distance between the wafer 2 and the heater element 4 exceeds 10% of the in-plane thickness of the insulating adhesive 3.
- Variation occurs, and the in-plane uniformity of the heat transferred from the heater element 4 to the wafer 2 is reduced.
- the in-plane temperature on the surface 2a of the wafer 2 becomes non-uniform, and the mounting surface of the electrostatic chuck device This is not preferable because the in-plane temperature distribution, temperature rise characteristics, and cooling characteristics during the temperature fall cannot be optimized.
- the heater element 4 generates heat when a predetermined voltage is applied to the power application electrodes 11 and 12, and is made of a nonmagnetic metal foil having a predetermined pattern.
- eight element pieces whose whole shape is a fan shape by meandering one thin metal wire are arranged around the central axis, and these are connected to form one heater element 4.
- the pattern of the heater element 4 in FIG. 1 shows an example, and can be appropriately changed according to the processing and application of the target semiconductor wafer.
- the heater element 4 has a constant thickness of 300 ⁇ m or less, preferably 100 ⁇ m or less, such as a non-magnetic metal foil such as titanium (Ti), tungsten (W), tantalum (Ta), molybdenum (Mo) or the like.
- the melting point metal foil is formed by etching into a desired heater pattern by photolithography.
- the reason why the thickness of the heater element 4 is set to 300 ⁇ m or less is that when the thickness exceeds 300 ⁇ m, the line width of the heater element is narrowed, so that the variation of the etching accuracy becomes large. This is because the temperature distribution of the wafer 2 changes and the temperature distribution on the surface of the wafer 2 cannot be measured accurately.
- the heater element 4 is formed of a non-magnetic metal foil, the heater element does not self-heat due to the high frequency even when the temperature measuring wafer 1 is used in a high frequency atmosphere. Since it becomes easy to maintain temperature, it is preferable.
- the temperature measurement area 5 is a substantially circular area having a diameter of 2 mm to 15 mm.
- the temperature of the temperature measurement area 5 is measured in real time using a non-contact type temperature measurement device such as a thermograph, an optical thermometer, or a radiation thermometer. It is possible to measure with.
- the position where the temperature measurement region 5 is formed is used to accurately know the in-plane temperature distribution, temperature rise characteristics, and cooling characteristics during temperature drop of the mounting surface of the electrostatic chuck device on which the temperature measuring wafer 1 is placed.
- the in-plane temperature distribution of the wafer 2 is selected accurately.
- the surface of the wafer 2 is scattered in a cross shape, and the temperature measurement regions 5 are arranged in a line at a predetermined interval.
- the insulating film 6 is provided so that the temperature of the temperature measurement region 5 can be measured using a thermograph, and is a sheet-like or film-like Teflon having heat resistance and insulation that can be measured by the thermograph. (Registered trademark), polyimide, polyamide and the like.
- the insulating film 6 may be any film that can measure the infrared transmittance with a thermograph, and the infrared transmittance in this case is preferably 80% or less.
- this insulating film 6 it is possible to prevent the temperature of the thermograph itself from affecting the measured value due to the reflection of the thermograph during measurement by the thermograph.
- the temperature measurement result varies depending on the emissivity of the object to be measured.
- the heater element 4 and the insulating adhesive 3 and the like have the same emissivity. Thus, the temperature measurement accuracy is improved.
- the insulating film 6 covers the heater element 4 and the entire temperature measurement region 5 here, but only the temperature measurement region 5 is covered in consideration of measuring the temperature of the temperature measurement region 5 using a thermograph. It is good also as a structure.
- a manufacturing method of the temperature measuring wafer 1 will be described. First, a wafer 2 to be flowed to a target semiconductor production line from a plate-like sample such as a semiconductor wafer as a product is selected. Next, an insulating adhesive 3 that is a sheet-like or film-like adhesive is stuck on the wafer 2.
- a nonmagnetic metal foil such as titanium (Ti), tungsten (W), tantalum (Ta), or molybdenum (Mo) is pasted on the insulating adhesive 3, and a desired heater pattern is formed by photolithography. Etching is performed to form the heater element 4. During this etching process, the temperature measurement region 5 is also formed at the same time.
- this insulating film 6 is a sheet-like or film-like Teflon (registered trademark) having heat resistance and insulation in order to prevent infrared rays from being reflected on the thermograph body and the outer wall of the chamber. ), Polyimide, polyamide or the like.
- Teflon registered trademark
- FIG. 3 is a schematic diagram showing a temperature measuring device 21 provided with the temperature measuring wafer 1 of the present embodiment.
- the temperature measuring device 21 is a sealed container in which the type, temperature, humidity, pressure, etc. of the atmosphere can be adjusted.
- a thermograph 24 that can be measured is provided, and the thermograph 24 can measure the surface temperature of the electrostatic chuck device 31 accommodated in the space 23 through a window 25 formed on the top plate. It is like that.
- the temperature measuring wafer 1 of the present embodiment is placed on the placement surface of the electrostatic chuck device 31.
- the electrostatic chuck device 31 includes a disk-shaped electrostatic chuck portion 32 and a disk-shaped cooling base portion 33 having a thickness for cooling the electrostatic chuck portion 32 to a desired temperature.
- the electrostatic chuck 32 may include a heater for heating a plate-like sample such as a silicon wafer.
- the electrostatic chuck device 31 on which the temperature measuring wafer 1 is placed is placed on the space 23 at the bottom of the sealed container 22, and the atmosphere, temperature, pressure, etc. in the sealed container 22 are adjusted.
- the vacuum atmosphere and the temperature are adjusted to 60 ° C.
- a desired gas may be introduced into the sealed container 22 to adjust the atmosphere, temperature, pressure, and the like.
- thermograph 24 a voltage is applied to the heater element 4 of the temperature measurement wafer 1 while measuring the temperature of the plurality of temperature measurement regions 5 of the temperature measurement wafer 1 in real time using the thermograph 24, and the temperature measurement wafer 1 is used as a semiconductor. Heat to the target wafer temperature to be reached in the manufacturing process. As a result of the measurement by the thermograph 24, the temperature rise characteristic of the wafer 2 in the temperature measurement wafer 1 is known. Therefore, the temperature rise characteristic on the mounting surface of the electrostatic chuck device 31 can be easily evaluated in real time.
- thermograph 24 sequentially measures the temperatures of the plurality of temperature measuring regions 5 of the temperature measuring wafer 1 in real time.
- the in-plane temperature distribution of the wafer 2 in the temperature measuring wafer 1 can be known. Therefore, the in-plane temperature distribution on the mounting surface of the electrostatic chuck device 31 can be easily evaluated in real time.
- thermograph 24 the temperature measuring wafer 1 is cooled by the cooling base 33, and the plurality of temperature measuring regions 5 of the temperature measuring wafer 1 are measured by the thermograph 24.
- the temperature is measured sequentially in real time.
- the cooling characteristics in the cooling process of the wafer 2 in the temperature measuring wafer 1 can be known in real time. Therefore, the cooling characteristic in the cooling process of the mounting surface of the electrostatic chuck device 31 can be easily evaluated in real time.
- the electrostatic chuck apparatus can be designed easily and in a short time. It became possible.
- the insulating adhesive 3 is attached to the entire surface 2a of the wafer 2, the heater element 4 is provided on the insulating adhesive 3, and the heater element 4 is attached. Since a plurality of substantially circular temperature measurement regions 5 are provided at predetermined locations (parts) in the excluded region, and the heater element 4 and the temperature measurement region 5 are covered with the insulating film 6, the surface temperature of the temperature measurement region 5 is reduced. Based on the measured values, the in-plane temperature distribution on the mounting surface of the electrostatic chuck device and the cooling characteristics when the temperature is lowered can be evaluated easily and in real time.
- the space 23 for housing the electrostatic chuck device 31 on which the temperature measuring wafer 1 is placed is provided at the bottom of the sealed container 22, and the sealed container 22 facing the space 23. Since the thermograph 24 is provided outside the top plate, and the surface temperature of the electrostatic chuck device 31 is measured by the thermograph 24 through the window 25 formed on the top plate, the temperature measuring wafer 1 is It is possible to simply and in real time evaluate the in-plane temperature distribution on the mounting surface of the electrostatic chuck device 31 and the cooling characteristics when the temperature is lowered. Thus, since the electrostatic chuck apparatus 31 can be measured easily, it can be used for shipping inspection and quality control of the electrostatic chuck apparatus.
- thermograph 24 is provided outside the top plate of the sealed container 22, and the surface temperature of the electrostatic chuck device 31 is measured through a window 25 formed on the top plate by the thermograph 24.
- a non-contact temperature measuring device such as an optical thermometer or a radiation thermometer is used, the in-plane temperature distribution on the mounting surface of the electrostatic chuck device 31 and It is possible to evaluate the cooling characteristics at the time of temperature drop simply and in real time.
- FIG. 4 is a cross-sectional view showing a temperature measurement wafer (temperature measurement plate) according to the second embodiment of the present invention.
- the temperature measurement wafer 41 according to this embodiment is a temperature measurement according to the first embodiment.
- the temperature measurement wafer 1 according to the first embodiment is different from the wafer 1 for temperature measurement in that the temperature measurement region 5 is provided in a predetermined portion (part) of the region excluding the heater element 4 on the insulating adhesive 3. While the heater element 4 and the temperature measurement region 5 are covered with the insulating film 6 having an infrared transmittance of 80% or less, in the temperature measurement wafer 41 of the present embodiment, a plurality of regions corresponding to the temperature measurement region of the insulating adhesive 3 are provided.
- thermocouple 42 is bonded and fixed to the exposed surface 2a of the wafer 2, and each of the hot contact portions 43 is heat-resistant. And insulation Is a point that was sealed with a Chakuzai 44.
- the temperature measurement wafer 41 when a voltage is applied to the heater element 4 and the temperature measurement wafer 41 is heated to a target wafer temperature to be reached in the semiconductor manufacturing process, the temperature measurement wafer 41 is heated by the thermocouple 42.
- the thermocouple 42 By sequentially measuring the temperature of the surface 2a of each wafer 2 in the plurality of temperature measurement regions in real time, the in-plane temperature distribution on the mounting surface of the electrostatic chuck device can be evaluated easily and in real time. .
- the temperature measurement wafer 41 is cooled by the cooling base portion 33, the temperature of the surface 2a of each wafer 2 in the plurality of temperature measurement regions of the temperature measurement wafer 41 is sequentially measured in real time by the thermocouple 42.
- the cooling characteristics in the cooling process of the mounting surface of the electrostatic chuck device can be easily evaluated in real time.
- the hot contact portions 43 of the thermocouples 42 are sealed with an adhesive 44 in each of the plurality of temperature measurement regions of the exposed surface 2 a of the wafer 2.
- the hot contact portion 43 of the thermocouple 42 may be bonded and fixed to the surface 2 a of the surface and sealed with the adhesive 44.
- the present invention relates to a temperature-measuring plate-like body and a temperature-measuring device including the same, and more specifically, an in-plane temperature on a placement surface of an electrostatic chuck device that places a plate-like sample such as a semiconductor wafer in a semiconductor manufacturing process.
- the present invention can be applied to a temperature measuring plate and a temperature measuring device including the same, which can easily evaluate the distribution, temperature rising characteristics, and cooling characteristics at the time of cooling in real time.
- Temperature measurement wafer (Temperature measurement plate) 2 Wafer (plate) 2a Surface (one main surface) 3 Insulating adhesive 4 Heater element (heating member) 5 Temperature measurement region 6 Insulating films 11 and 12 Voltage application electrode 13 Notch 21 Temperature measurement device 22 Sealed container 23 Space 24 Thermograph 25 Window 31 Electrostatic chuck device 32 Electrostatic chuck portion 33 Cooling base portion 41 Temperature measurement wafer ( Plate for temperature measurement) 42 Thermocouple 43 Hot junction 44 Adhesive
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Abstract
Description
本願は、2011年8月26日に、日本に出願された特願2011-185124号に基づき優先権を主張し、その内容をここに援用する。
プラズマエッチング装置等のプラズマを用いた半導体製造装置においては、従来から、試料台に簡単にウエハを取付け、固定するとともに、このウエハを所望の温度に維持する装置として静電チャック装置が使用されている。
この温度センサー付きウエハを用いて半導体製造ラインにおける静電チャック装置の製造条件を最適化する場合、この温度センサー付きウエハを静電チャック装置の載置面に載置し、この温度センサー付きウエハが載置された静電チャック装置を半導体製造ライン内を流す間にウエハの温度を温度センサーにてリアルタイムで測定する方法が採られていた。
また、温度センサー付きウエハの加熱を、静電チャック装置に内蔵されたヒーターを用い、あるいは半導体装置のプラズマ照射または外部ヒーターを用いて行う必要があり、静電チャック装置の載置面の面内温度分布や昇温特性や降温時における冷却特性の最適値化のプロセスが煩雑になり、最適値化までに時間が掛かるという問題点があった。
この温度測定用板状体では、加熱部材を金属箔とし、この金属箔を絶縁性接着剤を介して一方の主面に接着したことにより、加熱部材と板状体との間の熱伝達率が一定となる。
この温度測定用板状体では、板状体をケイ素、炭化ケイ素、窒化ケイ素、III-V属化合物半導体、II-VI属化合物半導体のいずれか1種とすることにより、製品となる半導体ウエハを用いた場合と同等の静電チャック装置の載置面における評価を得ることが可能になる。
この温度測定用板状体では、加熱部材を絶縁膜により被覆したので、加熱部材の絶縁性が良好に保持される。また、絶縁膜による被覆により、サーモグラフを用いた温度測定が可能になる。
この温度測定用板状体では、絶縁性接着剤を、アクリル系接着剤、エポキシ系接着剤、ポリイミドアミド系接着剤のいずれか1種を含むこととしたことにより、板状体と加熱部材との間の応力が緩和され、加熱部材が板状体から剥離する等の不具合が生じるおそれがなくなる。
この温度測定用板状体では、温度測定領域に熱電対を接続したことにより、温度測定領域の実際の温度を、熱電対を用いてリアルタイムで直接測定することが可能になる。これにより、この板状体の温度測定領域における実際の表面温度をリアルタイムで正確に測定することが可能になる。
この温度測定装置では、本発明の温度測定用板状体を備えたことにより、静電チャック装置の載置面における面内温度分布や昇温特性や降温時における冷却特性を簡便にしかもリアルタイムで評価することが可能になる。
なお、この形態は、発明の趣旨をより良く理解させるために具体的に説明するものであり、特に指定のない限り、本発明を限定するものではない。
図1は、本発明の第1の実施形態の温度測定用ウエハ(温度測定用板状体)を示す平面図、図2は、図1のA-B線に沿う断面図である。
この温度測定用ウエハ1は、ウエハ(板状体)2の表面(一方の主面)2a全面に絶縁性接着剤3が貼着され、この絶縁性接着剤3上に略蛇行状の所定のパターンを有するヒーターエレメント(加熱部材)4が設けられている。そして、この絶縁性接着剤3の表面3a上のヒーターエレメント4を除く領域のうち所定個所(一部)には、ウエハ2の表面2aの温度を測定するための略円形状の温度測定領域5が設けられている。
このウエハ2としては、例えば、シリコンウエハ、SiC(炭化ケイ素)ウエハ、Si3N4(窒化ケイ素)ウエハ、GaAs、GaAsN等のIII-V属化合物半導体ウエハ、ZnSe等のII-VI属化合物半導体ウエハ等が挙げられ、製品となる半導体ウエハに合わせて適宜選択使用される。
このウエハ2の大きさや形状は、この温度測定用ウエハ1を載置する静電チャック装置に合わせて適宜選択すればよく、特に制限はない。
この絶縁性接着剤3の厚みは5μm以上かつ100μm以下が好ましく、より好ましくは15μm以上かつ50μm以下である。この絶縁性接着剤3の面内の厚みのバラツキは、その厚みの10%以内であることが好ましい。
ここでは、1本の金属細線を蛇行させて全体形状を扇形状としたエレメント片を中心軸の回りに8枚配列し、これらを接続して1本のヒータエレメント4としてある。なお、図1のヒータエレメント4のパターンは、一例を示したものであり、対象となる半導体ウエハの処理や用途に合わせて適宜変更可能である。
ここで、ヒータエレメント4の厚みを300μm以下とした理由は、厚みが300μmを超えると、ヒーターエレメントの線幅が細くなるためにエッチング加工の精度のばらつきが大きくなり、その結果、ウエハ2の表面の温度分布が変化し、ウエハ2の表面の温度分布を正確に測定することができなくなるからである。
この温度測定領域5が形成される位置は、温度測定用ウエハ1が載置される静電チャック装置の載置面の面内温度分布や昇温特性や降温時における冷却特性を正確に知るために、ウエハ2の面内温度分布を正確に表すように選択される。ここでは、ウエハ2の表面に十字形状に点在しており、各温度測定領域5は、互いに所定の間隔をおいて一列に配列している。
この絶縁膜6を用いることで、サーモグラフによる測定時に、サーモグラフの写り込みによりサーモグラフ自体の温度が測定値に影響することを防ぐことができる。また、サーモグラフを用いた温度測定では、被測定物の輻射率により温度の測定結果が変わるが、この絶縁膜6を用いることでヒータエレメント4と絶縁性接着剤3等とを同じ輻射率とすることができ、よって温度の測定精度が向上する。
まず、製品となる半導体ウエハ等の板状試料から目的の半導体製造ラインに流されるウエハ2を選択する。
次いで、このウエハ2上に、シート状またはフィルム状の接着剤である絶縁性接着剤3を貼着する。
以上により、温度測定用ウエハ1を作製することができる。
まず、静電チャック装置31の載置面に本実施形態の温度測定用ウエハ1を載置する。
この静電チャック装置31は、円板状の静電チャック部32と、この静電チャック部32を所望の温度に冷却する厚みのある円板状の冷却ベース部33とを備えている。
この静電チャック部32は、シリコンウエハ等の板状試料を加熱するためのヒーターを内蔵していてもよい。
例えば、真空雰囲気、温度60℃に調整する。なお、密閉容器22内に所望のガスを導入して雰囲気、温度、圧力等を調整しても良い。
このサーモグラフ24による測定の結果、温度測定用ウエハ1におけるウエハ2の昇温特性が分かる。したがって、静電チャック装置31の載置面における昇温特性を、簡便にしかもリアルタイムで評価することができる。
サーモグラフ24による測定の結果、温度測定用ウエハ1におけるウエハ2の面内温度分布が分かる。したがって、静電チャック装置31の載置面における面内温度分布を簡便にしかもリアルタイムで評価することができる。
サーモグラフ24による測定の結果、温度測定用ウエハ1におけるウエハ2の冷却過程における冷却特性がリアルタイムで分かる。したがって、静電チャック装置31の載置面の冷却過程における冷却特性を簡便にしかもリアルタイムで評価することができる。
このように、静電チャック装置31を簡易的に測定できるので、静電チャック装置の出荷検査や品質管理にも用いることができる。
図4は、本発明の第2の実施形態の温度測定用ウエハ(温度測定用板状体)を示す断面図であり、本実施形態の温度測定用ウエハ41が第1の実施形態の温度測定用ウエハ1と異なる点は、第1の実施形態の温度測定用ウエハ1では、絶縁性接着剤3上のヒーターエレメント4を除く領域のうち所定個所(一部)に温度測定領域5を設け、これらヒーターエレメント4及び温度測定領域5を赤外線透過率が80%以下の絶縁膜6により被覆したのに対し、本実施形態の温度測定用ウエハ41では、絶縁性接着剤3の温度測定領域に当たる複数の部分を除去して、それらの部分のウエハ2の表面2aを露出させ、この露出したウエハ2の表面2aに熱電対42の温接点部43を接着固定し、これら温接点部43各々を耐熱性及び絶縁性を有する接着剤44にて封止した点である。
2 ウエハ(板状体)
2a 表面(一方の主面)
3 絶縁性接着剤
4 ヒーターエレメント(加熱部材)
5 温度測定領域
6 絶縁膜
11、12 電圧印加用電極
13 ノッチ
21 温度測定装置
22 密閉容器
23 スペース
24 サーモグラフ
25 窓
31 静電チャック装置
32 静電チャック部
33 冷却ベース部
41 温度測定用ウエハ(温度測定用板状体)
42 熱電対
43 温接点部
44 接着剤
Claims (7)
- 板状体の一方の主面に加熱部材を設け、かつ前記一方の主面上の前記加熱部材を除く領域の一部に、前記板状体の温度を測定するための温度測定領域を設けてなることを特徴とする温度測定用板状体。
- 前記加熱部材は金属箔であり、この金属箔は前記一方の主面に絶縁性接着剤を介して接着されていることを特徴とする請求項1記載の温度測定用板状体。
- 前記板状体は、ケイ素、炭化ケイ素、窒化ケイ素、III-V属化合物半導体、II-VI属化合物半導体のいずれか1種からなることを特徴とする請求項1または2記載の温度測定用板状体。
- 前記加熱部材は、絶縁膜により被覆されていることを特徴とする請求項1または2記載の温度測定用板状体。
- 前記絶縁性接着剤は、アクリル系接着剤、エポキシ系接着剤、ポリイミドアミド系接着剤のいずれか1種を含むことを特徴とする請求項2記載の温度測定用板状体。
- 前記温度測定領域に熱電対を接続してなることを特徴とする請求項1または2記載の温度測定用板状体。
- 請求項1または2記載の温度測定用板状体を備えていることを特徴とする温度測定装置。
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- 2012-08-22 WO PCT/JP2012/071165 patent/WO2013031596A1/ja active Application Filing
- 2012-08-22 KR KR1020147003987A patent/KR101783362B1/ko active IP Right Grant
- 2012-08-22 US US14/239,352 patent/US10502639B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000260683A (ja) * | 1999-03-05 | 2000-09-22 | Toshiba Corp | 半導体装置の製造装置 |
JP2004228334A (ja) * | 2003-01-23 | 2004-08-12 | Komatsu Ltd | 温調装置 |
Also Published As
Publication number | Publication date |
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TWI540675B (zh) | 2016-07-01 |
KR20140057270A (ko) | 2014-05-12 |
JP5915026B2 (ja) | 2016-05-11 |
JP2013046035A (ja) | 2013-03-04 |
TW201316450A (zh) | 2013-04-16 |
KR101783362B1 (ko) | 2017-09-29 |
US10502639B2 (en) | 2019-12-10 |
US20140204975A1 (en) | 2014-07-24 |
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