WO2021240945A1 - 静電チャック - Google Patents
静電チャック Download PDFInfo
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- WO2021240945A1 WO2021240945A1 PCT/JP2021/009255 JP2021009255W WO2021240945A1 WO 2021240945 A1 WO2021240945 A1 WO 2021240945A1 JP 2021009255 W JP2021009255 W JP 2021009255W WO 2021240945 A1 WO2021240945 A1 WO 2021240945A1
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- Prior art keywords
- gas
- ceramic plate
- electrostatic chuck
- zone
- zones
- Prior art date
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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
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/3244—Gas supply means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32715—Workpiece holder
- H01J37/32724—Temperature
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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
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67103—Apparatus for thermal treatment mainly by conduction
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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
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
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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
- 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
- H01L21/68714—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 the wafers being placed on a susceptor, stage or support
- H01L21/6875—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 the wafers being placed on a susceptor, stage or support characterised by a plurality of individual support members, e.g. support posts or protrusions
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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
- H01L21/68714—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 the wafers being placed on a susceptor, stage or support
- H01L21/68757—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 the wafers being placed on a susceptor, stage or support characterised by a coating or a hardness or a material
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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
- H01L21/68714—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 the wafers being placed on a susceptor, stage or support
- H01L21/68785—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 the wafers being placed on a susceptor, stage or support characterised by the mechanical construction of the susceptor, stage or support
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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
- H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
- H05B3/283—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material the insulating material being an inorganic material, e.g. ceramic
Definitions
- the present invention relates to an electrostatic chuck.
- an electrostatic chuck including a disk-shaped ceramic plate having a wafer mounting surface on the surface and an electrostatic electrode embedded in the ceramic plate is known.
- an electrostatic chuck of this type for example, as shown in Patent Documents 1 and 2, a chuck having a gas groove on a wafer mounting surface is known.
- Patent Document 1 describes one gas inlet penetrating the center of the ceramic plate in the thickness direction, and four gas distribution grooves provided on the wafer mounting surface so as to extend radially from the gas inlet.
- An electrostatic chuck with an exhaust port provided near the outer periphery of the ceramic plate so as to communicate with each of the gas distribution grooves is disclosed.
- Patent Document 2 discloses an electrostatic chuck that is divided into two semicircular zones when the ceramic plate is viewed from above, and a gas groove is provided for each semicircular zone. Specifically, in one semicircular zone, the gas provided in the center of the ceramic plate after passing through the notches of a plurality of concentric partition walls from the gas inlet provided near the outer periphery of the ceramic plate. Gas flows to the outlet. Further, in the other semicircular zone, a common gas inlet provided near the outer periphery of the ceramic plate is provided in the center of the ceramic plate after passing through notches of a plurality of concentric partition walls. Gas flows to the gas outlet. The gas flowing in one semi-circular zone and the gas flowing in the other semi-circular zone are not completely separated and mix in the middle.
- Patent Document 1 since the gas flowing through the four gas distribution grooves is supplied to the same gas inlet, it is not possible to control the gas individually for each gas distribution groove.
- Patent Document 2 since the gas flowing in one semicircular zone and the gas flowing in the other semicircular zone are mixed in the middle, it is not possible to control the gas individually for each zone.
- the present invention has been made to solve such a problem, and an object of the present invention is to enable the backside gas of the electrostatic chuck to be individually controlled for each zone.
- the electrostatic chuck of the present invention is A disk-shaped ceramic plate with a wafer mounting surface on the surface, The electrostatic electrode embedded in the ceramic plate and When the ceramic plate is viewed from above, it is divided into a plurality of zones, and each zone has a gas groove independently provided on the wafer mounting surface so as to reach from one of the pair of gas supply / discharge ports to the other. , It is equipped with.
- gas grooves are independently provided on the wafer mounting surface so as to reach from one of the pair of gas supply / discharge ports to the other in each zone.
- the gas groove is used to supply gas (backside gas) to the backside of the wafer mounted on the wafer mounting surface. Since such gas grooves are provided independently for each zone, the backside gas of the electrostatic chuck can be individually controlled for each zone.
- the plurality of zones are a circular zone having the same center as the ceramic plate and one or more annular zones having the same center as the ceramic plate and provided outside the circular zone. And may be included. This allows individual control of the gas flowing through the circular or annular zone.
- the pair of gas supply / discharge ports provided for each gas groove are arranged along a predetermined radial direction of the ceramic plate, and one of the two gas grooves provided in the zones adjacent to each other.
- the direction of the gas flowing through the is set clockwise, and the direction of the gas flowing through the other may be set counterclockwise.
- the plurality of zones may be a plurality of fan-shaped zones separated by the radius of the ceramic plate. In this way, the gas flowing through the plurality of fan-shaped zones can be individually controlled.
- the plurality of zones may be a plurality of curved zones separated by a curve extending from the center of the ceramic plate toward the outer edge. In this way, the gas flowing through the plurality of curved zones can be individually controlled.
- gas having different characteristics may be supplied to the gas grooves provided for each zone.
- characteristics include, for example, temperature, flow rate, pressure, gas type, and the like.
- the patterns for supplying gas to the gas grooves provided for each zone are the first pattern in which gas flows from one of the pair of gas supply / discharge ports to the other, and the pair of gas. It may be possible to select either pattern of the second pattern in which gas flows from the other side of the supply / discharge port to one side. In this way, it is possible to determine whether to flow the gas in the first pattern or the gas in the second pattern for each gas groove.
- the electrostatic chuck of the present invention may include a resistance heating element embedded in the ceramic plate so as to extend from one of the pair of terminals to the other in each zone. In this way, it becomes possible to individually control how much heating is performed for each zone.
- FIG. 3A is a cross-sectional view taken along the line AA of FIG.
- Explanatory drawing which shows the electrical connection of the electrostatic chuck 20.
- Explanatory drawing of the gas path 78a connected to the gas groove 25a Explanatory drawing of the gas path 78a connected to the gas groove 25a.
- Explanatory drawing of the gas path 78a connected to the gas groove 25a Explanatory drawing of the gas path 78a connected to the gas groove 25a.
- FIG. 9 is a cross-sectional view taken along the line BB of FIG. Sectional drawing of the electrostatic chuck 220.
- FIG. 1 is an explanatory view showing an outline of the configuration of the plasma processing apparatus 10
- FIG. 2 is a perspective view of the electrostatic chuck 20
- FIG. 3 is a plan view of the electrostatic chuck 20
- FIG. 4 is FIG.
- a cross-sectional view is shown in FIG. 5, which is an explanatory view showing an electrical connection of the electrostatic chuck.
- the resistance heating elements 31 to 37 are shaded for convenience.
- up / down, left / right, and front / back are merely relative positional relationships.
- the plasma processing apparatus 10 includes an electrostatic chuck 20 and an upper electrode 60 used for generating plasma inside a vacuum chamber 12 made of metal (for example, made of aluminum alloy) whose internal pressure can be adjusted. Is installed.
- the electrostatic chuck 20 is installed inside the vacuum chamber 12.
- the surface of the upper electrode 60 facing the electrostatic chuck 20 is provided with a large number of small holes for supplying the reaction gas to the wafer surface.
- the reaction gas can be introduced into the upper electrode 60 from the reaction gas introduction path 14, and the internal pressure of the vacuum chamber 12 can be reduced to a predetermined degree of vacuum by the vacuum pump connected to the exhaust passage 16.
- the electrostatic chuck 20 includes a ceramic plate 22 having a wafer mounting surface 22a capable of sucking and holding a wafer W on the upper surface, an electrostatic electrode 30 embedded in the ceramic plate 22 (see FIG. 4), and a ceramic plate 22. It is provided with resistance heating elements 31 to 37 (see FIGS. 3 and 4) embedded in the above.
- the ceramic plate 22 is a disc-shaped plate made of ceramic (for example, made of alumina or aluminum nitride) whose outer diameter is smaller than the outer diameter of the wafer W.
- the wafer mounting surface 22a has a circular protrusion 29 having the same center as the ceramic plate 22, and an annular protrusion 23a to be provided concentrically with the ceramic plate 22 so as to surround the circular protrusion 29. It has 23g. Further, the wafer mounting surface 22a is provided with a partition wall 28. The partition wall 28 extends linearly in the radial direction from the center side of the ceramic plate 22, connects the circular protrusion 29 and the annular protrusion 23a, and connects adjacent ones of the annular protrusions 23a to 23g. The wafer W mounted on the wafer mounting surface 22a is supported by the circular protrusion 29, the annular protrusions 23a to 23g, and the upper surface of the partition wall 28.
- Zone Z1 is a region inside the annular projection 23a. That is, the zone Z1 is a circular zone having the same center as the ceramic plate 22.
- Zone Z1 is provided with a C-shaped gas groove 25a in the outer region of the circular protrusion 29.
- the gas groove 25a is provided with a pair of supply / discharge ports 26a and 27a for supplying or discharging gas to the zone Z1.
- Zone Z2 is a region between the annular projection 23a and the annular projection 23b
- zone Z3 is a region between the annular projection 23b and the annular projection 23c
- zone Z4 is a region between the annular projection 23c and the annular projection 23d
- Zone Z5 is a region between the annular projection 23d and the annular projection 23e
- zone Z6 is a region between the annular projection 23e and the annular projection 23f
- zone Z7 is an annular projection 23e.
- zones Z2 to Z7 are annular zones provided concentrically with the ceramic plate 22 on the outside of the zone Z1.
- Zones Z2 to Z7 have corresponding C-shaped gas grooves 25b to 25g.
- the gas grooves 25b to 25g are provided in substantially the entire area of the zones Z2 to Z7 corresponding to each.
- Each of the C-shaped gas grooves 25b to 25g is provided with a supply / discharge port 26b to 26g at one end and a supply / discharge port 27a to 27g at the other end.
- a partition wall 28 is located between the supply / discharge ports 26a to 26g and the supply / discharge ports 27a to 27g.
- Both the supply / discharge ports 26a to 26g and the other supply / discharge ports 27a to 27g are provided along the partition wall 28. Therefore, the pair of supply / discharge ports 26a to 26g and 27a to 27g are arranged along a predetermined radial direction of the ceramic plate 22.
- the electrostatic electrode 30 is a planar electrode to which a DC voltage can be applied by the ESC power supply 71 shown in FIG. 5, and is provided in parallel with the wafer mounting surface 22a.
- a voltage is applied to the electrostatic electrode 30, the wafer W is attracted and held on the wafer mounting surface 22a by Coulomb force or Johnson Rahbek force, and when the application of DC voltage is released, the wafer W is attached to the wafer mounting surface 22a. Adsorption retention is released.
- the resistance heating elements 31 to 37 are resistance heating elements formed on the same plane parallel to the wafer mounting surface 22a in a one-stroke manner corresponding to each of the zones Z1 to Z7.
- the terminals provided at both ends of the resistance heating element 31 are connected to the heater power supply 81 shown in FIG. 5 via a feeding member (not shown) inserted from the back surface of the ceramic plate 22.
- the resistance heating element 31 When the voltage of the heater power supply 81 is applied to the resistance heating element 31, the resistance heating element 31 generates heat and heats the zone Z1.
- the other resistance heating elements 32 to 37 are also individually connected to the heater power supplies 82 to 87, and when a voltage is applied, the zones Z2 to Z7 are individually heated.
- the resistance heating elements 31 to 37 are formed of a conductive material containing, for example, W, WC, Mo and the like.
- the shape of the resistance heating elements 31 to 37 is not particularly limited, and may be, for example, a coil shape or a ribbon shape. Further, it may be printed with a paste of a conductive material.
- the control device 70 has a built-in well-known microcomputer equipped with a CPU, ROM, RAM, and the like. As shown in FIG. 5, the control device 70 inputs signals output from the temperature measuring sensors 62a to 62g and commands input by the operator from the input device 80 (keyboard, mouse, etc.). The temperature measuring sensors 62a to 62g are provided so as to measure the temperature at the position corresponding to each of the gas grooves 25a to 25g. Further, the control device 70 outputs electric power to the electrostatic electrode 30 via the ESC power supply 71, and outputs electric power to the resistance heating elements 31 to 37 via the heater power supplies 81 to 87.
- control device 70 controls the gas supply sources 74a to 74g to change the type, temperature, pressure and flow rate of the gas supplied to the gas grooves 25a to 25g, and controls the three-way valves 76a to 76g and 77a to 77g. By controlling, the direction of the gas flowing through the gas grooves 25a to 25g is controlled.
- AC power can also be supplied to the electrostatic electrode 30, and a high frequency voltage can be applied to the electrostatic electrode 30 via the high frequency power supply 72 when generating plasma.
- the ceramic plate 22 is provided with through holes 46a and 47a that penetrate the ceramic plate 22 in the thickness direction.
- the through holes 46a and 47a communicate with the supply / discharge ports 26a and 27a provided in the gas groove 25a, respectively.
- the through hole 46a is connected to the first three-way valve 76a.
- the through hole 47a is connected to the second three-way valve 77a.
- the first port is connected to the through hole 46a
- the second port is connected to the gas supply port
- the third port is the gas discharge port and the second three-way valve 77a. It is connected in the middle of the gas pipe to connect.
- the first port is connected to the through hole 47a
- the second port is connected to the gas outlet
- the third port is the gas supply port and the first three-way valve 76a. It is connected in the middle of the gas pipe that connects with.
- the numbers 1 to 3 circled in FIGS. 6 to 8 indicate the first to third ports of the three-way valve.
- the pattern of supplying gas to the gas groove 25a is the first pattern of flowing gas from the supply / discharge port 26a to the supply / discharge port 27a by adjusting the positions of the first and second three-way valves 76a and 77a by the control device 70. It is possible to switch between the second pattern of flowing gas from the supply / discharge port 27a to the supply / discharge port 26a.
- the first and second three-way valves 76a Adjust 77a as follows. That is, as shown in FIG. 6, the first three-way valve 76a is adjusted so that the first port and the second port of the first three-way valve 76a communicate with each other and the third port is blocked, and the first three-way valve 76a is adjusted. 2 Adjust the second three-way valve 77a so that the first port and the second port of the three-way valve 77a communicate with each other and the third port is shut off.
- the first and second three-way valves 76a and 77a are as follows. Adjust. That is, as shown in FIG. 7, the first three-way valve 76a is adjusted so that the first port and the third port of the first three-way valve 76a communicate with each other and the second port is blocked, and the first three-way valve 76a is adjusted. 2 Adjust the second three-way valve 77a so that the first port and the third port of the three-way valve 77a communicate with each other and the second port is shut off.
- the first and second three-way valves 76a and 77a are adjusted as follows. That is, as shown in FIG. 8, the first three-way valve 76a is adjusted so that the first port of the first three-way valve 76a is blocked and the second port and the third port communicate with each other, and the first three-way valve 76a is adjusted. 2 Adjust the second three-way valve 77a so that the second port of the three-way valve 77a is shut off and the second port and the third port communicate with each other. In this case, the gas supply source 74a may be stopped.
- the first three-way valves 76b to 76g and the second three-way valves 77b to 77g may be adjusted in the same manner as the gas grooves 25a.
- the wafer W is placed on the wafer mounting surface 22a of the ceramic plate 22 with the electrostatic chuck 20 installed in the vacuum chamber 12. Then, the inside of the vacuum chamber 12 is depressurized by a vacuum pump to adjust the degree of vacuum to a predetermined degree, and a DC voltage is applied to the electrostatic electrode 30 of the ceramic plate 22 to generate a Coulomb force or a Johnson Rahbek force to generate a wafer. W is attracted and held on the wafer mounting surface 22a of the ceramic plate 22. As a result, the gas grooves 25a to 25g form a gas space together with the wafer W.
- the inside of the vacuum chamber 12 is set to a reaction gas atmosphere of a predetermined pressure (for example, several tens to several hundreds of Pa), and in this state, a high frequency is generated between the upper electrode 60 in the vacuum chamber 12 and the electrostatic electrode 30 of the ceramic plate 22.
- a voltage is applied to generate a plasma.
- the surface of the wafer W is etched by the generated plasma.
- the target temperature T of the wafer W is set in advance for etching.
- the control device 70 adjusts the voltage applied to the resistance heating elements 31 to 37 of each zone Z1 to Z7 so that the output value of the temperature measuring sensors 62a to 62g matches the target temperature T, or adjusts the voltage applied to the resistance heating elements 31 to 37 of each zone Z1 to Z7.
- the direction of the gas flowing through the gas grooves 25a to 25g and the characteristics of the gas are adjusted.
- the first and second three-way valves 76a to 76g and 77a to 77g may be adjusted as described above.
- the gas supply sources 74a to 74g may be controlled.
- a low temperature gas is introduced into the gas groove of the zone corresponding to the hot spot, or a gas having a high thermal conductivity (for example, He gas) is supplied to the ceramic. Efficiently dissipate the heat of the hot spot to the plate 22. Alternatively, the filling pressure of the gas supplied to the gas groove may be increased. Alternatively, the amount of heat generated is suppressed by lowering the power supplied to the resistance heating element in the zone corresponding to the hot spot.
- a gas having a high thermal conductivity for example, He gas
- a gas having a high temperature is introduced into the gas groove corresponding to the cool spot, the flow velocity of the gas is increased, or a gas having a low thermal conductivity (for example, Ar gas) is introduced. It makes it difficult for the heat of the cool spot to escape to the ceramic plate 22 by supplying it. Alternatively, the filling pressure of the gas supplied to the gas groove may be lowered. Alternatively, the amount of heat generated is increased by increasing the power supplied to the resistance heating element in the zone corresponding to the cool spot.
- the three-way valves 76a, 77a, 76c, 77c, 76e, 77e, so that the direction in which the gas flows in the gas grooves 25a, 25c, 25e, 25g is the first pattern.
- the gas flow path is switched between 76 g and 77 g.
- the gas flow path is switched by the three-way valves 76a, 77a, 76c, 77c, 76e, 77e, 76g, 77g so that the direction in which the gas flows in the gas grooves 25b, 25d, 25f becomes the second pattern.
- heat exchange is performed between the gases flowing in the adjacent zones, and the gas having a uniform temperature flows through the gas grooves 25a to 25g.
- the gas grooves 25a to 25g are independently provided on the wafer mounting surface 22a so as to reach from one of the pair of supply / discharge ports to the other in each zone.
- the gas grooves 25a to 25g are used to supply gas (backside gas) to the backside of the wafer W mounted on the wafer mounting surface 22a. Since the gas grooves 25a to 25g are independently provided for each of the zones Z1 to Z7, the backside gas of the electrostatic chuck 20 can be individually controlled for each of the zones Z1 to Z7.
- the electrostatic chuck 20 includes a circular zone Z1 having the same center as the ceramic plate 22 and an annular zones Z2 to Z7 provided outside the zone Z1. Therefore, the gas flowing through the circular zone Z1 or the annular zones Z2 to Z7 can be individually controlled. Further, the direction of the gas flowing through one of the two gas grooves provided in the adjacent zones can be set clockwise, and the direction of the gas flowing through the other can be set counterclockwise. Therefore, for example, when a gas having the same temperature is supplied to two gas grooves provided in adjacent zones, it is possible to suppress the generation of a temperature distribution due to the gas.
- gas having different temperature, flow rate, pressure and gas type can be supplied to each of the gas grooves 25a to 25f provided corresponding to the zones Z1 to Z7. Therefore, it is possible to supply a gas having characteristics suitable for each zone.
- the patterns for supplying gas for each of the gas grooves 25a to 25g are the first pattern in which gas flows from the supply / discharge port 26 to the supply / discharge port 27 and the pattern from the supply / discharge port 27 to the supply / discharge port 26. Any of the second patterns in which gas flows can be selected. Therefore, it is possible to determine whether to flow the gas in the first pattern or the gas in the second pattern for each gas groove.
- resistance heating elements 31 to 37 corresponding to zones Z1 to Z7 are embedded in the ceramic plate 22. Therefore, it is possible to individually control how much each zone Z1 to Z7 is heated.
- the wafer mounting surface 22a is divided into a circular zone Z1 and an annular zone Z2 to Z7 when viewed from above, but the present invention is not limited to this.
- the wafer mounting surface 122a of the ceramic plate 122 has a plurality of fan-shaped zones Z12 separated by the radius of the ceramic plate 122 when viewed from above. It may be divided into.
- Each zone Z12 is provided with a fan-shaped gas groove 125 in substantially the entire area.
- a supply / discharge port 126 is provided on the center side of each gas groove 125, and a supply / discharge port 127 is provided on the outer peripheral side.
- a partition wall 128 extending from the center side of the wafer mounting surface 122a toward the outer peripheral side is provided between adjacent zones Z12. Gas can be independently supplied to each gas groove 125. In this way, the gas flowing through the plurality of zones Z12 can be individually controlled.
- the wafer mounting surface 222a of the ceramic plate 222 has a plurality of curves separated by a curve extending from the center of the ceramic plate 222 toward the outer edge when viewed from above. It may be divided into zones Z22.
- Each zone Z22 is provided with a curved gas groove 225 in substantially the entire area.
- a supply / discharge port 226 is provided on the center side of each gas groove 225, and a supply / discharge port 227 is provided on the outer peripheral side.
- a partition wall 228 extending from the center side of the wafer mounting surface 222a toward the outer peripheral side and curving from the center side toward the outer peripheral side is provided between adjacent zones Z22. Gas can be independently supplied to each gas groove 225. In this way, the gas flowing through the plurality of zones Z22 can be individually controlled.
- the resistance heating elements 31 to 37 are embedded in the ceramic plate 22, but the resistance heating elements 31 to 37 may not be embedded.
- the temperature of the wafer W is mainly controlled by the gas flowing through the gas grooves 25a to 25g.
- a metal (for example, aluminum or aluminum alloy) cooling plate may be adhered or joined to the back surface of the electrostatic chuck 20.
- a refrigerant flow path through which a refrigerant (for example, cooling water) circulates may be provided inside the cooling plate.
- the temperature of the wafer W can also be controlled by the refrigerant.
- the present invention can be used for semiconductor manufacturing equipment.
- Plasma processing device 12 Vacuum chamber, 14 Reaction gas introduction path, 16 Exhaust passage, 20, 120, 220 Electrostatic chuck, 22, 122, 222 Ceramic plate, 22a, 122a, 222a Wafer mounting surface, 23a to 23g ring Projections, 25a to 25g, 125,225 gas grooves, 26a to 26g, 27a to 27g, 126,127,226,227 air supply / discharge ports, 28,128 partition walls, 29 circular protrusions, 30 electrostatic electrodes, 31 to 37 resistors Heat generator, 46a, 47a through hole, 60 upper electrode, 62a to 62g temperature measuring sensor, 70 control device, 71 ESC power supply, 72 high frequency power supply, 74a to 74g gas supply source, 76a to 76g first three-way valve, 77a to 77g 2nd three-way valve, 78a gas path, 80 input device, 81-87 heater power supply, W wafer, Z1-Z7, Z12, Z22 zone.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Plasma & Fusion (AREA)
- Analytical Chemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
- Drying Of Semiconductors (AREA)
Abstract
Description
表面にウエハ載置面を有する円盤状のセラミックプレートと、
前記セラミックプレートに埋設された静電電極と、
前記セラミックプレートを上からみたときに複数のゾーンに分かれており、前記ゾーンごとに一対のガス給排口の一方から他方に至るように前記ウエハ載置面に独立して設けられたガス溝と、
を備えたものである。
Claims (8)
- 表面にウエハ載置面を有する円盤状のセラミックプレートと、
前記セラミックプレートに埋設された静電電極と、
前記セラミックプレートを上からみたときに複数のゾーンに分かれており、前記ゾーンごとに一対のガス給排口の一方から他方に至るように前記ウエハ載置面に独立して設けられたガス溝と、
を備えた静電チャック。 - 前記複数のゾーンは、前記セラミックプレートと中心が同じである円形ゾーンと、前記セラミックプレートと中心が同じであり前記円形ゾーンの外側に設けられた1以上の環状ゾーンとを含む、
請求項1に記載の静電チャック。 - 前記ガス溝ごとに設けられた前記一対のガス給排口は、前記セラミックプレートの所定の半径方向に沿って並んでおり、互いに隣接するゾーンに設けられた2つのガス溝のうち一方を流れるガスの方向は時計回りに設定され、他方を流れるガスの方向は反時計回りに設定されている、
請求項2に記載の静電チャック。 - 前記複数のゾーンは、前記セラミックプレートの半径によって区切られた複数の扇形ゾーンである、
請求項1に記載の静電チャック。 - 前記複数のゾーンは、前記セラミックプレートの中心から外縁に向かって延びる曲線によって区切られた複数の湾曲ゾーンである、
請求項1に記載の静電チャック。 - 前記ゾーンごとに設けられた前記ガス溝には、それぞれに特性の異なるガスを供給可能である、
請求項1~5のいずれか1項に記載の静電チャック。 - 前記ゾーンごとに設けられた前記ガス溝にガスを供給するパターンは、前記一対のガス給排口の一方から他方にガスが流れる第1パターンと、前記一対のガス給排口の他方から一方にガスが流れる第2パターンの、いずれかのパターンを選択可能である、
請求項1~6のいずれか1項に記載の静電チャック。 - 請求項1~7のいずれか1項に記載の静電チャックであって、
前記ゾーンごとに一対の端子の一方から他方に至るように前記セラミックプレートに埋設された抵抗発熱体
を備えた静電チャック。
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JP2022527526A JP7356587B2 (ja) | 2020-05-25 | 2021-03-09 | 静電チャック |
KR1020227031947A KR102654628B1 (ko) | 2020-05-25 | 2021-03-09 | 정전 척 |
CN202180013642.3A CN115552586A (zh) | 2020-05-25 | 2021-03-09 | 静电卡盘 |
US17/933,153 US12106994B2 (en) | 2020-05-25 | 2022-09-19 | Electrostatic chuck |
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JP2020-090932 | 2020-05-25 |
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US17/933,153 Continuation US12106994B2 (en) | 2020-05-25 | 2022-09-19 | Electrostatic chuck |
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JPWO2021240945A1 (ja) | 2021-12-02 |
KR102654628B1 (ko) | 2024-04-03 |
KR20220142491A (ko) | 2022-10-21 |
CN115552586A (zh) | 2022-12-30 |
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