WO2010026893A1 - 静電チャック装置及び基板の吸着状態判別方法 - Google Patents
静電チャック装置及び基板の吸着状態判別方法 Download PDFInfo
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- WO2010026893A1 WO2010026893A1 PCT/JP2009/064831 JP2009064831W WO2010026893A1 WO 2010026893 A1 WO2010026893 A1 WO 2010026893A1 JP 2009064831 W JP2009064831 W JP 2009064831W WO 2010026893 A1 WO2010026893 A1 WO 2010026893A1
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- substrate
- electrostatic chuck
- adsorption
- heat flux
- chuck device
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Images
Classifications
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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
- H01L21/687—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 mechanical means, e.g. chucks, clamps or pinches
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/15—Devices for holding work using magnetic or electric force acting directly on the work
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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
- H01L21/67253—Process monitoring, e.g. flow or thickness monitoring
-
- 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
- H01L21/673—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 using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders
- H01L21/6732—Vertical carrier comprising wall type elements whereby the substrates are horizontally supported, e.g. comprising sidewalls
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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
-
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N13/00—Clutches or holding devices using electrostatic attraction, e.g. using Johnson-Rahbek effect
Definitions
- the present invention relates to an electrostatic chuck device and a method for determining a suction state of a substrate, and more specifically, an electrostatic chuck device including a suction determination unit for determining a suction state of a substrate, and the electrostatic chuck device.
- the present invention relates to a method for determining an adsorption state of a used substrate.
- An electrostatic chuck device is used to attract and hold a substrate.
- an electrostatic chuck device is used for adsorbing and holding an insulating substrate such as a substrate laminating device or an ion doping device used for press-fitting liquid crystal into a glass substrate or the like.
- An electrostatic chuck device is generally formed by laminating an electrostatic chuck that adsorbs a semiconductor substrate, a glass substrate or the like on the upper surface side of a metal substrate. Then, by applying a predetermined voltage to the attracting electrode provided in the electrostatic chuck, an electric charge or electric field is formed on the surface of the electrostatic chuck, and these substrates are attracted by an electric force.
- the temperature of the substrate rises due to plasma processing, ion implantation, or the like. For example, when a silicon wafer is etched by a plasma device, the substrate temperature is about 200 ° C. Reach up to.
- a part of the substrate is masked by using a resist or the like for ion implantation or plasma processing.
- the resist reaches such a high temperature state, it is hardened more than necessary, thereby hindering subsequent removal work. .
- a liquid conduit for circulating a liquid refrigerant such as pure water is formed on the metal base so as to keep the temperature of the substrate properly.
- foreign substances such as particles are present when the substrate is held on the electrostatic chuck, and the substrate is not completely flattened in the first place, so that a part of the substrate may not be normally adsorbed.
- a part of the adsorption electrode provided in the electrostatic chuck may be disconnected, or a part of the insulating layer covering the adsorption electrode may be damaged.
- semiconductor substrates and glass substrates have been increased in size, and it is increasingly difficult to completely flatten the substrates. Further, an electrostatic chuck apparatus that attracts these substrates is required to further improve the attraction force. .
- the shape of the adsorption electrode becomes more complicated and the insulating layer is made thinner, and the possibility of the above trouble is increasing.
- the cooling effect as mentioned above does not function sufficiently, the substrate temperature rises abnormally, the resist is hardened, elements formed on the board, etc. May also be affected.
- thermometer thermocouple or radiation thermometer
- the difference in capacitance between the state where the substrate is attracted to the electrostatic chuck and the state where the adsorption force is released and the substrate is lifted is slight. It is difficult to accurately determine the attachment / detachment state. If the mounting / dismounting state of the substrate is mistakenly determined, for example, even if it is attempted to lift the substrate by a lift pin pushed up from the lower surface side of the metal base, the separation fails or the substrate is damaged by excessive force. There is also a fear.
- the adsorption state of the substrate is discriminated based on the temperature profile obtained in advance while measuring the substrate temperature during processing of the substrate with the electrostatic chuck device. Therefore, it is necessary to monitor a predetermined temperature change. For this reason, it takes time for the determination, and in order to determine the adsorption state of the substrate retroactively in actual use of the apparatus, for example, if an attempt is made to determine the adsorption failure of the substrate using this method, an abnormality will be detected. When detected, the substrate is already damaged considerably.
- the former discrimination method requires at least a capacitance measuring device and a discrimination circuit.
- the latter discrimination method at least a radiation thermometer and a discrimination circuit are necessary), and it becomes a large facility for discriminating the adsorption state of the substrate.
- the present inventors have found that the heat flow from the substrate when using the electrostatic chuck device in which the substrate side is hotter than the metal substrate. By obtaining a bundle, it was found that the adsorption state of the substrate can be correctly and instantaneously determined while solving the above-described problems, and the present invention has been completed.
- an object of the present invention is to provide an electrostatic chuck device provided with an adsorption discriminating means that can quickly and accurately grasp the adsorption state of a substrate in the electrostatic chuck device.
- Another object of the present invention is to provide a method for determining the state of adsorption of a substrate that can quickly and accurately grasp the state of adsorption of the substrate in the electrostatic chuck apparatus.
- the present invention is an electrostatic chuck device provided with an electrostatic chuck for adsorbing a substrate on the upper surface side of a metal substrate, and is provided with an adsorption discriminating means for discriminating the adsorption state of the substrate.
- This is an electric chuck device.
- the present invention also relates to a method for determining an adsorption state of a substrate in an electrostatic chuck apparatus having an electrostatic chuck for attracting a substrate on the upper surface side of the metal substrate, the substrate being transmitted via the electrostatic chuck.
- the substrate adsorption state determination method is characterized in that a heat flux sensor is obtained by a heat flux sensor and the adsorption state of the substrate is determined.
- the electrostatic chuck device of the present invention includes an adsorption determination unit for determining an adsorption state of a substrate adsorbed on the electrostatic chuck.
- a heat flux sensor is preferably used for the adsorption determination unit.
- heat flows into the low temperature side from the high temperature side the heat energy that passes through a unit area heat flux (unit: W / m 2) can be regarded as.
- W / m 2 unit area heat flux
- the present inventors pay attention to the fact that a temperature gradient is formed so that the temperature of the substrate is higher than that of the metal substrate side when the substrate is processed by the electrostatic chuck apparatus, and the substrate is separated from the substrate on the low temperature side.
- the adsorption state of the substrate was determined by obtaining a heat flow (heat flux).
- the heat flux sensor 7 for obtaining the heat flow from the substrate w transmitted through the electrostatic chuck may be attached to the downstream side of the heat flow, and either the electrostatic chuck 6 or the metal substrate 1 may be used. Alternatively, the heat flux sensor 7 may be attached to both of them, but preferably, the heat flux sensor 7 is disposed so as to avoid a portion that hinders the flow of heat from the substrate w.
- a liquid conduit 2 through which a liquid refrigerant flows is formed on the metal substrate 1, but heat is absorbed if these parts are included in the middle of the path of heat flow from the substrate w. There is a possibility that the suction state of the substrate w cannot be correctly determined.
- the heat flux sensor 7 is disposed on the metal substrate side from the viewpoint of workability, and more preferably, the heat flux sensor 7 is a metal flux. It is good to arrange
- the type and shape of the heat flux sensor 7 are not particularly limited, and may be a thin and flat sheet type or a cylindrical type. As a specific example, a series of products such as a heat flux microsensor (HFM series), a sheet-like BF sensor, a thermo gauge, a Schmid-Belter gauge, and the like manufactured by Vatell® Corporation of the United States can be exemplified.
- a plurality of heat flux sensors 7 may be provided to obtain heat flux at a plurality of locations with respect to the planar area of the substrate w.
- the adsorption state of the substrate can be grasped in more detail. For example, if the heat flux is not detected by some of the heat flux sensors 7, an adsorption failure occurs at least at the position of the substrate w corresponding to the heat flux sensor 7, and a gap is generated between the substrate w and the substrate adsorption surface 6a. Can be judged.
- the heat flux sensors 7 If no heat flux is detected by all the heat flux sensors 7, it may be determined that an adsorption failure has occurred at a position corresponding to these heat flux sensors 7, or that the lifting of the substrate w has been completed by a lift pin or the like. it can.
- the cause of the substrate adsorption failure for example, when foreign matter such as particles enters the back surface of the substrate and cannot be normally adsorbed, due to unevenness of the substrate itself, partial disconnection of the adsorption electrode in the electrostatic chuck or adsorption electrode It is assumed that the insulating layer covering the substrate is partially damaged.
- FIG. 3 shows an arrangement example of the plurality of heat flux sensors 7. As the number of sensors increases, a more detailed situation can be ascertained, but it may be set as appropriate according to the size of the substrate w while taking into account the labor and cost of processing, etc. It is.
- a predetermined threshold value may be set for the value detected by the heat flux sensor 7 to determine the adsorption state of the substrate w. That is, if the heat flux measured during use of the electrostatic chuck device falls below the threshold value, as described above, there is a gap between the substrate w and the substrate suction surface 6a, or the substrate w is detached. Can be determined. Further, as the case where the threshold value is exceeded, for example, the adsorption voltage becomes high because the adsorption voltage becomes high, or the water or the like adheres to the entire back surface of the substrate w or the substrate adsorption surface 6a due to some reason.
- the heat flux obtained from the heat flux sensor 7 may be used in the following manner.
- the temperature is estimated by multiplying the heat flux (W / m 2 ) obtained by the heat flux sensor 7 by the thermal resistance (° C. m 2 / W) per unit area of the material to which the heat flux has been transmitted. it can.
- the thermal resistance (° C. m 2 / W) per unit area of the material is “material thickness (m) / material thermal conductivity (W / m ° C.)”. Therefore, the heat flux obtained by the heat flux sensor 7 is sampled at a constant period by a program process such as a personal computer, and monitored while replacing it with temperature information, whereby the process monitoring of the electrostatic chuck device can be performed.
- on-time heat flux ie, ion flux
- the quality of the suction state of the substrate w is determined by comparing it with temperature data separately sampled when the suction state of the substrate w is normal, and if an abnormality is confirmed, for example, the processing apparatus side that processes the substrate w
- a warning signal may be transmitted to the control system to display a warning, or may be used as an interlock to stop processing.
- an electrostatic chuck device having a self-diagnosis (failure diagnosis) function that can estimate the cause of the adsorption failure by using a plurality of heat flux sensors 7 can be provided.
- the adsorption state of the substrate can be quickly and accurately determined. Moreover, since the electrostatic chuck apparatus of the present invention has the suction discrimination means inside, the equipment and the like do not become large, and the utility value is extremely high industrially. Furthermore, according to the method for discriminating the suction state of the substrate according to the present invention, it is possible to correctly and instantaneously discriminate the attachment and detachment of the substrate and the suction failure.
- FIG. 1 is an explanatory cross-sectional view of an electrostatic chuck device according to the present invention.
- FIG. 2 is an enlarged cross-sectional explanatory view of a part of the electrostatic chuck device according to the present invention.
- FIG. 3 is an example of a layout diagram of the heat flux sensor.
- FIG. 4 is a cross-sectional explanatory view of an electrostatic chuck device equipped with a failure diagnosis function.
- FIG. 5 is a flowchart of failure diagnosis.
- Metal base 1a Mounting surface 2: Liquid conduit 3: Lower insulating layer 4: Adsorption electrode 5: Upper insulating layer 6: Electrostatic chuck 6a: Substrate adsorption surface 7: Heat flux sensor (adsorption discrimination means) 8: Amplifier 9: A / D converter 10: Personal computer w: Board
- FIG. 1 is a cross-sectional explanatory view of an electrostatic chuck device according to the present invention provided with an electrostatic chuck 6 on the upper surface side of a metal substrate 1.
- the metal substrate 1 is made of aluminum, copper, stainless steel or the like and has a mounting surface 1a corresponding to the type and size of the substrate w such as a semiconductor substrate or a glass substrate to be sucked and held.
- the metal substrate 1 suitable for adsorbing a silicon substrate having a diameter of 300 mm has a mounting surface 1a having a diameter of about 298 mm.
- a liquid conduit 2 for flowing a liquid refrigerant is formed in the metal substrate 1, and the substrate is formed by circulating the liquid refrigerant supplied from the outside inside the metal substrate while passing through a heat exchanger or the like not shown. Cooling of w can be performed. Further, the metal substrate 1 is supplied with a cooling gas such as helium supplied from the lower surface side to the back surface of the substrate w through a gas supply hole (not shown) formed in the electrostatic chuck 6 to supply a gas for cooling the substrate w. A path may be formed.
- the upper surface side of the metal substrate 1 represents the substrate w side unless otherwise specified, and the lower surface side represents the side opposite to the substrate w.
- two heat flux sensors 7 are provided on the upper surface side of the metal substrate 1.
- This heat flux sensor 7 is arranged so that the top of the sensor (the part that takes in the heat flux) is flush with the mounting surface 1a, and a signal is sent to the lower surface side of the metal substrate 1 through a wiring path not shown. Pull out the lines.
- FIG. 1 shows an example in which two heat flux sensors 7 are attached, as shown in FIG. 3, the number of sensors may be appropriately increased or decreased according to the shape, size, etc. of the substrate w. The number or arrangement of sensors other than may be used.
- an electrostatic chuck 6 including a lower insulating layer 3, an adsorption electrode 4 and an upper insulating layer 5 is formed on the upper surface side of the metal substrate 1.
- the electrostatic chuck 6 is not particularly limited, and a known one can be used.
- the lower insulating layer 3 and the upper insulating layer 5 it is possible to use those having an insulating film such as polyimide, a predetermined shape and thickness and ceramics plate, also of alumina (Al 2 O 3) powder, Ceramic powder such as aluminum nitride (AlN) powder and zirconia (ZrO 2 ) powder may be sprayed to form the film.
- both the lower insulating layer 3 and the upper insulating layer 5 are formed of a ceramic powder sprayed layer, there is no particular limitation, but the thickness of each is about 20 to 300 ⁇ m. In the case of an insulating film such as polyimide, it is generally about 20 to 300 ⁇ m.
- a planarization process such as polishing may be performed as necessary.
- the adsorption electrode 5 in addition to the metal foil, the adsorption electrode may be formed by etching a metal formed by sputtering, ion plating or the like into a predetermined shape. You may make it obtain an adsorption
- the thickness of the adsorption electrode 5 is generally about 0.1 to 3 ⁇ m, and the film thickness of the adsorption electrode 5 formed by spraying a conductive metal is about Generally, it is about 10 to 50 ⁇ m.
- the adsorption electrode 5 may not be formed in a portion corresponding to the capture path. Further, the shape of the adsorption electrode 5 is not particularly limited, and may be set as appropriate according to the type and size of the substrate w to be adsorbed. Further, a so-called bipolar electrostatic chuck that applies a voltage to the two electrodes is configured. It may be one that constitutes a monopolar electrostatic chuck.
- the lower insulating layer 3, the adsorption electrode 4 and the upper insulating layer 5 may be sequentially stacked on the upper surface side of the metal substrate 1. 3.
- the electrostatic chuck device After forming the electrostatic chuck 6 including the adsorption electrode 4 and the upper insulating layer 5, the electrostatic chuck device may be obtained by adhering to the upper surface side of the metal substrate 1 using an adhesive or the like. .
- this electrostatic chuck device has two heat flux sensors 7 (manufactured by Vatell Corporation, USA) on the upper surface side of an aluminum metal substrate 1 having a mounting surface 1a having a diameter of 298 mm. HFM-7E / L) is attached, and all are arranged so that the sensor top is flush with the mounting surface 1a.
- a lower insulating layer 3 having a diameter of 298 mm and a film thickness of 100 ⁇ m formed by spraying alumina powder having a purity of 99.99% and two semicircles having a diameter of 294 mm are mutually connected.
- An upper electrode 5 having a diameter of 298 mm and a thickness of 50 ⁇ m formed by spraying a 30 ⁇ m-thick adsorption electrode 4 formed through a mask so as to face each other with a distance of 2 mm between the electrodes and a 99.99% purity alumina powder. are stacked.
- the electrostatic chuck apparatus is set in an ion implantation apparatus (not shown), a silicon wafer w having a diameter of 300 mm is mounted on the electrostatic chuck 6, and a voltage of 2 kV is applied between the two adsorption electrodes 4 to apply the substrate adsorption surface 6a.
- the silicon wafer w was adsorbed on the substrate. While circulating pure water at a temperature of 20 ° C. through the liquid conduit 2 of the metal substrate 1 at a flow rate of 2 liters / minute, the ion beam energy is 100 kV, the current is 3 mA, and the average ion beam power is 0.3 W / unit area.
- the ion implantation process was carried out under the conditions of cm 2. During this time, the values obtained by the two heat flux sensors 7 were both 0.25 W / cm 2 . Moreover, as long as it was confirmed by visual observation, no abnormality was found in the adsorption state of the silicon wafer w.
- the application of voltage to the adsorption electrode 4 was stopped, and the plasma gun was turned on to sufficiently remove the residual charge on the substrate adsorption surface 6a of the electrostatic chuck 6.
- the silicon wafer w was lifted by a push-up pin (not shown) provided in the electrostatic chuck device during irradiation with the same ion beam, the value obtained by the two heat flux sensors 7 at the same time was 0.01 W / cm 2 . there were.
- the suction state of the silicon wafer w was confirmed visually and by an infrared proximity sensor, it was completely detached from the substrate suction surface 6a and detached, so that the electrostatic chuck device according to the present invention is provided. It was confirmed that the adsorption state of the substrate can be determined by the heat flux sensor 7.
- FIG. 4 shows an example in which the electrostatic chuck apparatus of the present invention is equipped with a failure diagnosis function.
- a silicon wafer w having a diameter of 300 mm is ion-implanted by an ion implantation apparatus, and during that time, the signal obtained by the heat flux sensor 7 is set to a voltage level of the order of maximum 10 V where the signal amplifier 8 is less susceptible to noise.
- the personal computer 10 inputs to the personal computer 10 through the A / D (analog to digital) converter 9.
- the outline of the processing in the personal computer 10 is as shown in the flowchart of FIG.
- the amplified signal from the heat flux sensor 7 was sampled at a constant period by program processing in the personal computer 10.
- the processing time of the substrate w may be determined in consideration of the capacity (for example, 300 GB) of the magnetic disk provided in the personal computer 10 because there is a range of about 1 second to 1 hour depending on processing contents even in the same ion implantation apparatus.
- the minimum sampling period is set to 10 ms. Since the physical quantity being measured is heat, the change is relatively slow and it is not necessary to make frequent measurements.
- the sampled value is stored in the magnetic disk through data processing such as smoothing and noise removal. Then, the temperature of the cooling water flowing through the metal substrate 1 and its flow rate are separately monitored, and from the sampling data stored in the magnetic disk and the heat transfer coefficients of the lower insulating layer 3 and the upper insulating layer 5 of the electrostatic chuck 6, The temperature at the substrate suction surface 6a of the electrostatic chuck 6 is calculated (estimated value) based on the following equation (1). That is, It is.
- “cooling water temperature (° C.)” is “cooling water temperature flowing into the metal substrate (° C.)”
- cooling water heat transfer coefficient” is “a function of the temperature and flow velocity”. “Thermal resistance of the electrostatic chuck (° C.
- ⁇ m 2 / W is “the sum of the total thermal resistance from the upper part of the liquid conduit 2 to the back surface of the substrate w”.
- the “average incident power (W / m 2 )” is a heat flux and is expressed by “power per unit area flowing into the substrate w”. For example, in an ion implantation apparatus, “average beam power of the ion beam” is This is equivalent to “average ion incident power + high frequency power” in the plasma processing apparatus.
- the calculated temperature is compared with, for example, past data and a standard value when there is no problem in the suction state of the substrate w, and if it is determined to be normal, it is displayed as being normal, If judged, a warning is displayed.
- This warning signal may be transmitted to a control system on the ion implantation apparatus side and used as an interlock for stopping the processing.
- the cause of the adsorption failure can be diagnosed by the number of sensors that have detected an abnormal value.
- signals from a plurality of heat flux sensors indicate abnormal values, for example, 1) an abnormality in the suction power source connected to the adsorption electrode 4 of the electrostatic chuck 6, 2) an abnormality in the voltage value, 3) a voltage of the electrostatic chuck 6 Abnormalities in the supply unit, 4) current value and energy abnormality of processing ions, 5) abnormalities in cooling water (temperature rise, insufficient amount of cooling water), and the like are conceivable. That is, the common problem when it sees with an electrostatic chuck apparatus single-piece
- the signal from the single heat flux sensor shows an abnormal value, for example, 1) the presence of foreign matter such as particles between the substrate w and the electrostatic chuck 6, 2) the uniformity of processed ions, 3) electrostatic Local problems such as partial disconnection of the attracting electrode 4 included in the chuck and 4) partial damage of the upper insulating layer 5 and / or the lower insulating layer 3 included in the electrostatic chuck are considered as factors.
- the electrostatic chuck device of the present invention can be applied to various electrostatic chuck devices used in a semiconductor manufacturing process, a liquid crystal manufacturing process, and the like, and the adsorption state of a substrate to be processed such as a semiconductor substrate or a glass substrate can be determined. It can be correctly and instantaneously determined.
- the method for determining the adsorption state of a substrate using a heat flux sensor it is possible to immediately determine the attachment / detachment state of the substrate with respect to the substrate adsorption surface by a change in the heat flux. The effect in a big scene is great.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
Abstract
Description
1a :載置面
2 :液体管路
3 :下部絶縁層
4 :吸着電極
5 :上部絶縁層
6 :静電チャック
6a :基板吸着面
7 :熱流束センサ(吸着判別手段)
8 :増幅器
9 :A/D変換器
10 :パソコン
w :基板
図1は、金属基盤1の上面側に静電チャック6を備えた本発明に係る静電チャック装置の断面説明図である。金属基盤1は、アルミニウム、銅、ステンレス等からなり、吸着保持する半導体基板やガラス基板等の基板wの種類やサイズに応じた載置面1aを有する。例えば直径300mmのシリコン基板の吸着に適した金属基盤1は、直径298mm程度の載置面1aを有する。また、金属基盤1には、液体冷媒を流すための液体管路2が形成され、図示外の熱交換器等を経由させながら、外部から供給された液体冷媒を金属基盤内部で巡回させて基板wの冷却を行うことができる。更に金属基盤1には、下面側から供給されたヘリウム等の冷却ガスを静電チャック6に形成した図示外のガス供給孔を通じて基板wの裏面に供給し、基板wを冷却するためのガス供給経路を形成してもよい。なお、金属基盤1の上面側とは、特に断りのない限り基板w側を表し、下面側とは、基板wとは反対側を表す。
図1に示した本発明の静電チャック装置を用いて、イオン注入装置で直径300mmのシリコンウエハwをイオン注入処理した場合にシリコンウエハwの吸着状態を判別した例を以下に説明する。この静電チャック装置は、図3(A)に示したように、直径298mmの載置面1aを有したアルミニウム製金属基盤1の上面側に2箇所熱流束センサ7(米国Vatell Corporation社製:HFM-7E/L)が取り付けられており、いずれもセンサ頂部が載置面1aと面一になるように配設されている。そして、この金属基盤1の載置面1aには、純度99.99%のアルミナ粉末を溶射して形成した直径298mm、膜厚100μmの下部絶縁層3と、直径294mmの2つの半円形が互いに電極間距離2mmで向き合うようにマスクを介して形成された膜厚30μmの吸着電極4と、更に純度99.99%のアルミナ粉末を溶射して形成した直径298mm、膜厚50μmの上部絶縁層5とを有した静電チャック6が積層されている。
図4は、本発明の静電チャック装置に故障診断機能を装備させた例を示す。上記と同様に、イオン注入装置で直径300mmのシリコンウエハwをイオン注入処理し、その間、熱流束センサ7で得られた信号を信号増幅器8によりノイズの影響が出にくい最大10Vオーダーの電圧レベルに上げ、A/D(アナログtoデジタル)変換器9を通してパソコン10に入力させた。パソコン10内での処理の概要は、図5のフローチャートに示したとおりである。増幅された熱流束センサ7からの信号は、パソコン10内のプログラム処理により一定の周期によりサンプリングした。基板wの処理時間は、同じイオン注入装置であっても処理内容によって1秒~1時間程度の幅があるため、パソコン10が備える磁気ディスクの容量(例えば300GB)を考慮して決めればよい。本実施の形態では最小サンプリング周期を10msに設定した。測定している物理量は熱であるためその変化は比較的遅く、あまり頻繁な計測をする必要はない。
である。ここで、「冷却水の温度(℃)」は『金属基盤に流入する冷却水の温度(℃)であり、「冷却水の熱伝達係数」は『その温度と流速の関数』であり、「静電チャックの熱抵抗(℃・m2/W)」は『液体管路2の上部から基板wの裏面までの総熱抵抗の和』である。また、「平均入射パワー(W/m2)」は熱流束であって『基板wに流入する単位面積当たりの電力』で表され、例えばイオン注入装置では『そのイオンビームの平均ビーム電力』がこれに相当し、プラズマ処理装置では『イオンの平均入射電力+高周波電力』がこれに相当する。
Claims (9)
- 基板を吸着させる静電チャックを金属基盤の上面側に備えた静電チャック装置であり、基板の吸着状態を判別するための吸着判別手段を備えたことを特徴とする静電チャック装置。
- 吸着判別手段が熱流束センサであり、静電チャックを介して伝達される基板からの熱の流れにより基板の吸着状態を判別する請求項1に記載の静電チャック装置。
- 熱流束センサが金属基盤側に配設される請求項2に記載の静電チャック装置。
- 熱流束センサが、金属基盤の上面と面一になるように配設される請求項3に記載の静電チャック装置。
- 基板の平面領域に対して複数個所で熱流束を得る請求項2~4のいずれかに記載の静電チャック装置。
- 基板を吸着させる静電チャックを金属基盤の上面側に備えた静電チャック装置において、基板の吸着状態を判別する方法であって、静電チャックを介して伝達される基板からの熱の流れを熱流束センサで得て、基板の吸着状態を判別することを特徴とする基板の吸着状態判別方法。
- 熱流束センサが金属基盤側に配設される請求項6に記載の基板の吸着状態判別方法。
- 熱流束センサが、金属基盤の上面と面一になるように配設される請求項7に記載の基板の吸着状態判別方法。
- 基板の平面領域に対して複数個所で熱流束を得る請求項6~8のいずれかに記載の基板の吸着状態判別方法。
Priority Applications (5)
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US13/060,237 US20110141650A1 (en) | 2008-09-04 | 2009-08-26 | Electrostatic chuck device and method for determining attracted state of wafer |
EP09811420A EP2362415A4 (en) | 2008-09-04 | 2009-08-26 | ELECTROSTATIC SLICE SUPPORT DEVICE AND WAFER ADSORBED STATE DETERMINATION METHOD |
CN200980134448XA CN102144285B (zh) | 2008-09-04 | 2009-08-26 | 静电吸盘装置和基片的吸附状态判断方法 |
JP2010527756A JP5387921B2 (ja) | 2008-09-04 | 2009-08-26 | 静電チャック装置及び基板の吸着状態判別方法 |
HK11110405.5A HK1156149A1 (en) | 2008-09-04 | 2011-10-03 | Electrostatic chuck device and method for determining adsorbed state of wafer |
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JP2008-226664 | 2008-09-04 | ||
JP2008226664 | 2008-09-04 |
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US (1) | US20110141650A1 (ja) |
EP (1) | EP2362415A4 (ja) |
JP (1) | JP5387921B2 (ja) |
KR (1) | KR20110065484A (ja) |
CN (1) | CN102144285B (ja) |
HK (1) | HK1156149A1 (ja) |
TW (1) | TW201027662A (ja) |
WO (1) | WO2010026893A1 (ja) |
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JP2013153017A (ja) * | 2012-01-24 | 2013-08-08 | Ulvac Japan Ltd | 基板吸着状態の判定方法およびプラズマ処理装置 |
JP2014146745A (ja) * | 2013-01-30 | 2014-08-14 | Ulvac Japan Ltd | 基板吸着検知方法 |
JP2015026700A (ja) * | 2013-07-25 | 2015-02-05 | 株式会社クリエイティブ テクノロジー | センサ一体型吸着チャック及び処理装置 |
JP2019114614A (ja) * | 2017-12-21 | 2019-07-11 | 株式会社デンソー | 熱交換器の異常検出装置 |
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US9580806B2 (en) | 2013-08-29 | 2017-02-28 | Applied Materials, Inc. | Method of processing a substrate support assembly |
CN105082717A (zh) * | 2015-09-11 | 2015-11-25 | 武汉华星光电技术有限公司 | 真空贴合设备与基板贴合方法 |
JP6519802B2 (ja) * | 2016-03-18 | 2019-05-29 | パナソニックIpマネジメント株式会社 | プラズマ処理方法およびプラズマ処理装置 |
CN108527002B (zh) * | 2018-04-27 | 2020-04-07 | 上海理工大学 | 一种数控机床主轴生热量内置式检测系统 |
KR20220004893A (ko) * | 2020-07-03 | 2022-01-12 | 삼성디스플레이 주식회사 | 표시 장치의 제조 장치 및 표시 장치의 제조 방법 |
DE102020007791A1 (de) * | 2020-12-18 | 2022-06-23 | Att Advanced Temperature Test Systems Gmbh | Modulares Wafer-Chuck-System |
JP2022120418A (ja) * | 2021-02-05 | 2022-08-18 | 東京エレクトロン株式会社 | 基板処理装置、基板処理システム及び異常検知方法 |
EP4423804A1 (en) * | 2021-10-28 | 2024-09-04 | Entegris, Inc. | Electrostatic chuck that includes upper ceramic layer that includes a dielectric layer, and related methods and structures |
CN113990727B (zh) * | 2021-12-24 | 2022-03-15 | 北京凯世通半导体有限公司 | 一种超低温晶圆注入平台 |
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Also Published As
Publication number | Publication date |
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EP2362415A4 (en) | 2012-05-30 |
CN102144285A (zh) | 2011-08-03 |
EP2362415A1 (en) | 2011-08-31 |
HK1156149A1 (en) | 2012-06-01 |
TW201027662A (en) | 2010-07-16 |
CN102144285B (zh) | 2013-01-02 |
JP5387921B2 (ja) | 2014-01-15 |
US20110141650A1 (en) | 2011-06-16 |
JPWO2010026893A1 (ja) | 2012-02-02 |
KR20110065484A (ko) | 2011-06-15 |
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