Patent Publication Number: US-2022238314-A1

Title: Mounting table structure, substrate processing apparatus, and method of controlling substrate processing apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application No. 2021-008954 filed on Jan. 22, 2021, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a mounting table structure, a substrate processing apparatus, and a method of controlling the substrate processing apparatus. 
     BACKGROUND 
     Extremely low temperature processing may be required in a substrate processing apparatus, for example, a film forming apparatus. For example, Japanese Laid-open Patent Publication No. 2020-72249 provides a stage device and a processing apparatus that can rotate a mounted substrate in a state in which the substrate is cooled to an extremely low temperature and high cooling performance is provided. In such a processing apparatus, a cooling gas supplied from the outside of the processing apparatus is sufficiently cooled and supplied to a gap between a stage and a refrigerating heat transfer body to cool the stage to an extremely low temperature. 
     Japanese Patent No. 6559347 proposes a holding device that rotatably holds a target subject to be processed (hereinafter, referred to as “target subject”) while the target subject is cooled in a vacuum chamber, and includes a stage on which the target subject is installed, a rotary driving means that rotatably supports the stage, and a cooling means which cools the stage. In the holding device, the cooling means includes a cooling panel that is disposed in a space below the stage to face a lower surface of the stage with a gap therebetween, a heat transfer shaft that is inserted into a rotating shaft and comes into contact with the lower surface of the cooling panel, and a refrigerator that cools the heat transfer shaft. 
     SUMMARY 
     In an indirect method using a refrigerant such as a cooling gas, a partial contact cooling method using a powdery or paste-like heat conductive material, or a cooling method using both of the above methods, it may take some time to control to a target cooling temperature. 
     The present disclosure provides a mounting table structure, a substrate processing apparatus, and a method of controlling the substrate processing apparatus capable of enhancing the cooling efficiency of a substrate. 
     One aspect of the present disclosure provides a mounting table structure comprising a mounting table on which a substrate is mounted, a refrigerating mechanism configured to cool the substrate, an elevating drive part configured to move the mounting table or the refrigerating mechanism up and down, and at least one contact provided at a position between the refrigerating mechanism and the mounting table which face each other. The refrigerating mechanism and the mounting table are allowed to be brought into contact with each other via the contact by moving the mounting table or the refrigerating mechanism up and down by the elevating drive part. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic cross-sectional view illustrating an example of a substrate processing apparatus according to an embodiment. 
         FIGS. 2A and 2B  are diagrams illustrating an example of a periphery of a contact of a mounting table structure according to the embodiment. 
         FIGS. 3A to 3C  are diagrams illustrating a periphery of the contact of the mounting table structure according to the embodiment. 
         FIG. 4  is a diagram illustrating another example around the periphery of the contact of the mounting table structure according to the embodiment. 
         FIG. 5  is a diagram illustrating an example of an operation of a substrate processing apparatus and a state of the contact according to the embodiment. 
         FIG. 6  is a flowchart illustrating an example of a method of controlling the substrate processing apparatus according to the embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments for implementing the present disclosure will be described with reference to the drawings. In each of the accompanying drawings, the same components may be designated by the same reference numerals, and duplicate descriptions thereof may be omitted. 
     [Substrate Processing Apparatus] 
     First, an example of a substrate processing apparatus  100  according to an embodiment of the present disclosure will be described with reference to  FIG. 1 .  FIG. 1  is a longitudinal cross-sectional view illustrating an example of the substrate processing apparatus  100  according to the embodiment. The substrate processing apparatus  100  illustrated in  FIG. 1  is, for example, an apparatus that performs desired film formation on a substrate W such as a semiconductor wafer as a substrate to be processed inside a vacuum processing container  10  that forms a vacuum atmosphere and performs substrate processing with a processing gas. The substrate processing apparatus is a physical vapor deposition (PVD) apparatus. 
     The substrate processing apparatus  100  includes a vacuum processing container  10 , a mounting table  20 , a refrigerating device  30 , a rotating device  40 , a first elevating device  77 , and a second elevating device  78 . The mounting table  20  mounts the substrate W thereon inside the vacuum processing container  10 . The rotating device  40  rotates the mounting table  20 . The first elevating device  77  moves the mounting table  20  up and down. The second elevating device  78  moves the refrigerating device  30  up and down. The substrate processing apparatus  100  further includes a controller  80  that controls various devices such as the refrigerating device  30 , the rotating device  40 , the first elevating device  77 , and the second elevating device  78 . The substrate processing apparatus  100  of the illustrated example includes two elevating devices including the first elevating device  77  that moves the mounting table  20  up and down and the second elevating device  78  that moves the refrigerating device  30  up and down, but the mounting table  20  and the refrigerating device  30  may be moved up and down by a common elevating device. 
     A refrigerator  31  and a cold link  35  of the refrigerating device  30  which will be described below are examples of a refrigerating mechanism for cooling the substrate W. The rotating device  40  is an example of a rotation drive part that rotates the substrate W. The first elevating device  77  and the second elevating device  78  are examples of an elevating drive part for moving a substrate or a refrigerating mechanism up and down. 
     In the inside of the vacuum processing container  10 , the mounting table  20  is located on the lower side, and a plurality of target holders  11  are fixed above the mounting table  2  in a state in which they have a predetermined inclination angle θ with respect to a horizontal plane. Then, different types of targets T are mounted on lower surfaces of the target holders  11 . The inclination angle θ may be 0°, that is, the target holder  11  may be fixed horizontally. 
     The vacuum processing container  10  is configured so that a pressure therein is reduced to a vacuum by operating an exhaust device  13  such as a vacuum pump. A processing gas (for example, a rare gas such as argon (Ar), krypton (Kr), neon (Ne), or a nitrogen (N 2 ) gas) required for a film formation by sputtering is supplied from a processing gas supply device (not illustrated) to the vacuum processing container  10 . 
     An alternating current (AC) voltage or a direct current (DC) voltage from a plasma generation power supply (not illustrated) is applied to the target holder  11 . When an AC voltage is applied from the plasma generation power supply to the target holder  11  and the target T, plasma is generated inside the vacuum processing container  10 , and a rare gas or the like inside the vacuum processing container  10  is ionized. Then, the target T is sputtered by an ionized rare gas element or the like. Atoms or molecules of the sputtered target T are deposited on a surface of the substrate W held on the mounting table  20  to face the target T. 
     It is possible to adjust an incident angle at which the sputtered particles sputtered from the target T are incident on the substrate W by inclining the target T with respect to the substrate W, and thus it is possible to improve the in-plane uniformity of a film thickness of a magnetic film or the like formed on the substrate W. Even when each of the target holders  11  is installed at the same inclination angle θ inside the vacuum processing container  10 , the mounting table  20  is moved up and down to change a distance t 1  between the target T and the substrate W, and thus the incident angle of the sputtered particles on the substrate W can be changed. Therefore, the mounting table  20  is controlled to move up and down so that the distance t 1  suitable for each of the targets T is set for each of the targets T to be applied. 
     The number of targets T is not particularly limited, but from the viewpoint that different films formed of different materials can be sequentially formed by one substrate processing apparatus  100 , preferably, a plurality of different targets T are present inside the vacuum processing container  10 . 
     The refrigerating device  30  includes the refrigerator  31  and the cold link  35 , and the cold link  35  is stacked on the refrigerator  31 . A plurality of contacts  21   a  are provided on the cold link  35  of the refrigerating device  30 , and the mounting table  20  is disposed via the plurality of contacts  21   a . The refrigerator  31  holds the cold link  35  and can cool an upper surface of the cold link  35  to an extremely low temperature of, for example, −30° C. or lower to about −200° C. From the viewpoint of cooling capacity, the refrigerator  31  preferably uses a Gifford-McMahon (GM) cycle. 
     The cold link  35  is fixed on the refrigerator  31 , and an upper portion thereof is accommodated inside the vacuum processing container  10 . The cold link  35  is made of copper (Cu) or the like having high thermal conductivity, and an exterior thereof is substantially cylindrical. The refrigerator  31  and the cold link  35  are disposed so that centers thereof coincide with a central axis CL of the mounting table  20 . 
     A refrigerant supply flow path  51  and a refrigerant discharge flow path  52  are disposed inside the cold link  35  and the refrigerator  31 . The refrigerant supply flow path  51  supplies a refrigerant, which is a heat transfer gas, between the cold link  35  and the mounting table  20 . The refrigerant discharge flow path  52  discharges the refrigerant of which temperature is raised by heat transfer from the mounting table  20 . The refrigerant supply flow path  51  and the refrigerant discharge flow path  52  are examples of flow paths provided in a refrigerating mechanism to supply a temperature control medium such as a refrigerant. 
     The refrigerant supply flow path  51  and the refrigerant discharge flow path  52  are respectively fixed to connection fixing parts  31   a  and  31   b  on a wall surface of the refrigerator  31 . The refrigerant supply flow path  51  and the refrigerant discharge flow path  52  are examples of flow paths for supplying the temperature control medium provided in the refrigerating device  30 . 
     A temperature control refrigerant (for example, a first cooling gas) is supplied from a refrigerant supply device (not illustrated) and flows through the refrigerant supply flow path  51 . Distal ends of the refrigerant supply flow path  51  and the refrigerant discharge flow path  52  open in an upper surface of the cold link  35 , and the first cooling gas is supplied to a space in which a spring  26  is disposed between the cold link  35  and the mounting table  20 . As the first cooling gas supplied to the space in which the spring  26  is disposed, helium (He) gas having high thermal conductivity is preferably used. As the first cooling gas, an inert gas may be used so that the spring  26  and the like in the space do not corrode. Thus, the thermal conductivity of the space between the cold link  35  and the mounting table  20  can be increased, and cooling efficiency of the substrate W can be enhanced. 
     The refrigerant discharged from the space in which the spring  26  is disposed flows through the refrigerant discharge flow path  52  and is discharged to a refrigerant discharge device (not illustrated). The refrigerant supply flow path  51  and the refrigerant discharge flow path  52  may be formed by the same flow path. 
     The plurality of contacts  21   a  are provided on the side of the cold link  35  of the refrigerating device  30 . The plurality of contacts  21   a  are respectively connected to a plurality of springs  26  and are mounted to face the mounting table  20 . The plurality of springs  26  may be spiral-shaped springs such as compression coil springs. The spring  26  is an example of an elastic body. The contact  21   a  is made of copper (Cu) having high thermal conductivity. However, it may be configured of any material having high thermal conductivity. 
     The mounting table  20  has a structure in which an upper mounting part  25  on which the substrate W is mounted and a lower contact  21   b  are stacked, and the mounting part  25  and the contact  21   b  are formed of copper (Cu) having high thermal conductivity. However, the mounting part  25  and the contact  21   b  may be formed of any material having high thermal conductivity. The mounting part  25  includes an electrostatic chuck, and the electrostatic chuck has a chuck electrode  32  embedded in a dielectric film. A predetermined potential is applied to the chuck electrode  32  via a wiring  33 . With such a configuration, the substrate W can be suctioned by the electrostatic chuck, and the substrate W can be held on an upper surface of the mounting table  20 . 
     In the present embodiment, the plurality of contacts  21   a  disposed on the side of the cold link  35  of the refrigerating device  30 , and the contact  21   b  disposed on the side of the mounting table  20  are provided. The contact  21   a  and the contact  21   b  can be brought into contact with each other or separated from each other by up and down movement due to at least one of the first elevating device  77  that moves the mounting table  20  up and down and the second elevating device  78  that moves the refrigerating device  30  up and down. That is, the cold link  35  of the refrigerating device  30  and the mounting table  20  can be brought into contact with each other via the plurality of contacts  21   a  and the contact  21   b.    
     The mounting table  20  is supported by an outer cylinder  63 . The outer cylinder  63  is disposed to cover an outer peripheral surface of an upper portion of the cold link  35 , and an upper portion thereof enters the inside of the vacuum processing container  10  and supports the mounting table  20  inside the vacuum processing container  10 . The outer cylinder  63  has a cylindrical part  61  having an inner diameter slightly larger than an outer diameter of the cold link  35 , and a flange part  62  extending from the lower surface of the cylindrical part  61  in an outer diameter direction, and the cylindrical part  61  directly supports the mounting table  20 . The cylindrical part  61  and the flange part  62  are formed of a metal such as stainless steel. 
     A heat insulating member  64  is connected to a lower surface of the flange part  62 . The heat insulating member  64  has a substantially cylindrical shape that extends coaxially with the flange part  62  and is fixed to the lower surface of the flange part  62 . The heat insulating member  64  is made of a ceramic such as alumina. A magnetic fluid sealing part  69  is provided on a lower surface of the heat insulating member  64 . 
     The magnetic fluid sealing part  69  includes a rotating part  65 , an inner fixing part  66 , an outer fixing part  67 , and a heating source  68 . The rotating part  65  has a substantially cylindrical shape that extends coaxially with the heat insulating member  64  and is fixed to the lower surface of the heat insulating member  64 . In other words, the rotating part  65  is connected to the outer cylinder  63  via the heat insulating member  64 . With such a configuration, the heat transfer of cold and heat of the outer cylinder  63  to the rotating part  65  is blocked by the heat insulating member  64 , and it is possible to prevent the temperature of a magnetic fluid of the magnetic fluid sealing part  69  from being lowered, to prevent deterioration of sealing performance, and to suppress the occurrence of dew condensation. 
     The inner fixing part  66  is provided between the cold link  35  and the rotating part  65  via a magnetic fluid. The inner fixing part  66  has a substantially cylindrical shape in which an inner diameter thereof is larger than an outer diameter of the cold link  35  and an outer diameter thereof is smaller than an inner diameter of the rotating part  65 . The outer fixing part  67  is provided outside the rotating part  65  via a magnetic fluid. The outer fixing part  67  has a substantially cylindrical shape in which an inner diameter thereof is larger than an outer diameter of the rotating part  65 . The heating source  68  is embedded inside the inner fixing part  66  and heats the entire magnetic fluid sealing part  69 . With such a configuration, it is possible to prevent the temperature of the magnetic fluid of the magnetic fluid sealing part  69  from being lowered, to prevent deterioration of the sealing performance, and to suppress the occurrence of dew condensation. With such a configuration, in the magnetic fluid sealing part  69 , the rotating part  65  is rotatable in a state in which it is airtight with respect to the inner fixing part  66  and the outer fixing part  67 . That is, the outer cylinder  63  is rotatably supported via the magnetic fluid sealing part  69 . 
     A substantially cylindrical bellows  75  is provided between an upper surface of the outer fixing part  67  and a lower surface of the vacuum processing container  10 . The bellows  75  is a metal bellows structure that can be expanded and contracted in a vertical direction. The bellows  75  surrounds an upper portion of the cold link  35 , a lower portion of the outer cylinder  63 , and the heat insulating member  64 , and separates an internal space of the vacuum processing container  10  capable of being decompressed and an external space of the vacuum processing container  10  from each other. 
     A slip ring  73  is provided below the magnetic fluid sealing part  69 . The slip ring  73  has a rotating body  71  including a metal ring, and a fixed body  72  including a brush. The rotating body  71  has a substantially cylindrical shape that extends coaxially with the rotating part  65  of the magnetic fluid sealing part  69  and is fixed to a lower surface of the rotating part  65 . The fixed body  72  has a substantially cylindrical shape in which an inner diameter thereof is slightly larger than an outer diameter of the rotating body  71 . The slip ring  73  is electrically connected to a DC power supply (not illustrated), and electric power supplied from the DC power supply is supplied to the wiring  33  via the brush of the fixed body  72  and the metal ring of the rotating body  71 . With such a configuration, it is possible to apply a potential to the chuck electrode from the DC power supply without causing twisting or the like in the wiring  33 . The rotating body  71  constituting the slip ring  73  is mounted in the rotating device  40 . The slip ring  73  may have a structure other than the brush structure and may have, for example, a non-contact power supply structure, a structure that is mercury-free or has a conductive liquid, or the like. 
     The rotating device  40  is a direct drive motor having a rotor  41  and a stator  45 . The rotor  41  has a substantially cylindrical shape that extends coaxially with the rotating body  71  of the slip ring  73  and is fixed to the rotating body  71 . The stator  45  has a substantially cylindrical shape in which an inner diameter thereof is larger than an outer diameter of the rotor  41 . With such a configuration, when the rotor  41  rotates, the rotating body  71 , the rotating part  65 , the outer cylinder  63 , and the mounting table  20  rotate in an X3 direction relative to the cold link  35 . The rotating device may have a form other than the direct drive motor, or may have a form including a servomotor and a transmission belt. 
     Further, a heat insulating body  74  having a vacuum heat insulating double structure is provided around the refrigerator  31  and the cold link  35 . In the illustrated example, the heat insulating body  74  is provided between the refrigerator  31  and the rotor  41  and between a lower portion of the cold link  35  and the rotor  41 . With such a configuration, it is possible to suppress the heat transfer of cold and heat of the refrigerator  31  and the cold link  35  to the rotor  41 . 
     Further, the refrigerator  31  is fixed to an upper surface of a first support  70 A which is mounted in the second elevating device  78  to be movable up and down. Meanwhile, the rotating device  40  and the heat insulating body  74  are fixed to an upper surface of a second support  70 B which is mounted in the first elevating device  77  to be movable up and down. Additionally, a substantially cylindrical bellows  76  surrounding the refrigerator  31  is provided between the upper surface of the first support  70 A and a lower surface of the second support  70 B. Like the bellows  75 , the bellows  76  is also a metal bellows structure that can be expanded and contracted in the vertical direction. 
     A second cooling gas supply pipe  34  for supplying a second cooling gas is provided in the mounting table  20 . The second cooling gas supply pipe  34  passes through the mounting part  25  and supplies the second cooling gas such as He gas between a lower surface of the substrate W and an upper surface of the mounting part  25  from a gas hole  34   a . The second cooling gas may be a gas different from the first cooling gas flowing through the refrigerant supply flow path  51  or may be the same gas. As the second cooling gas, an inert gas may be used. As a result, the thermal conductivity of the space between the lower surface of the substrate W and the upper surface of the mounting part  25  can be increased, and the cooling efficiency of the substrate W can be enhanced. 
     The controller  80  is configured as a computer. The controller  80  includes a central processing unit (CPU), a main storage device, an auxiliary storage device, an input and output interface, and a communication interface which are connected to each other by a connection bus. The main storage device and the auxiliary storage device are computer-readable recording media. 
     The CPU performs control of the entire controller  80 . For example, the CPU executably expands a program stored in the auxiliary storage device in a work area of the main storage device and performs control of peripheral devices through execution of the program, thereby providing a function suitable for a predetermined purpose. The main storage device stores a computer program executed by the CPU, data processed by the CPU, and the like. The main storage device includes, for example, a flash memory, a random access memory (RAM), and a read only memory (ROM). The auxiliary storage device stores various programs and various types of data in a readable and writable recording medium. The auxiliary storage device is a silicon disk including a non-volatile semiconductor memory, a hard disk drive (HDD) device, a solid state drive device, or the like. Further, the auxiliary storage device may be a compact disc (CD), a digital versatile disc (DVD), a Blu-ray disc (BD), a universal serial bus (USB) memory, an secure digital (SD) memory card or the like as a detachable and attachable recording medium. The communication interface is an interface with a network connected to the controller  80 . The input and output interface is an interface for inputting and outputting data between the controller  80  and a device connected to the controller  80 , and examples thereof include a keyboard and a touch panel. The controller  80  receives an operation instruction or the like from an operator, who operates an input device, via the input and output interface. The controller  80  controls operations of various peripheral devices. These peripheral devices include the refrigerating device  30 , the rotating device  40 , the first elevating device  77 , the second elevating device  78 , and the like. 
     As described above, a mounting table structure of the substrate processing apparatus  100  includes the mounting table  20  on which the substrate W is placed, a refrigerating mechanism that cools the substrate W, an elevating drive part that moves the mounting table  20  or the refrigerating mechanism up and down, and contacts provided at positions on the refrigerating mechanism and the mounting table  20  which face each other, and is configured so that the refrigerating mechanism and the mounting table  20  can be brought into contact with each other via the contacts by the up and down movement of the mounting table  20  or the refrigerating mechanism due to the elevating drive part. 
     [Direct Contact by Contact] 
     Next, the periphery of the contact of the mounting table structure according to the embodiment will be described with reference to  FIGS. 2A and 2B .  FIGS. 2A and 2B  are diagrams illustrating an example of the periphery of the contact of the mounting table structure according to the embodiment. 
     Among the constituents of the substrate processing apparatus  100  of  FIG. 1 , the refrigerating device  30  is configured to be movable up and down by the second elevating device  78 , and the mounting table  20  is configured to be movable up and down by the first elevating device  77 . 
     Before a film forming process, for example, the contact  21   a  and the contact  21   b  can be brought into direct contact with each other by the upward movement of the refrigerating device  30  due to the second elevating device  78  as illustrated at the time of contact in  FIG. 2A . Before the film forming process, the contact  21   a  and the contact  21   b  may be brought into direct contact with each other by the downward movement of the mounting table  20  due to the first elevating device  77  as illustrated at the time of contact in  FIG. 2A . 
     Meanwhile, at the time of the film forming process, a distance t 1  between the target T and the substrate W is adjusted by, for example, the upward movement of the mounting table  20  inside the vacuum processing container  10  due to the first elevating device  77 . The adjustment of the distance t 1  is appropriately changed according to the type of target T to be applied. Further, in order to form a film while the mounting table  20  is rotated during the film forming process, the contact  21   a  and the contact  21   b  are separated from each other as illustrated in  FIG. 2B . As a result, a film can be formed on the substrate W, while the mounting table  20  is rotated by the rotating device  40 . When it is not necessary to adjust the distance t 1 , instead of moving the first elevating device  77  up, the second elevating device  78  may be moved down to separate the contact  21   a  and the contact  21   b  from each other. The contact  21   a  and the contact  21   b  may be separated by synchronous control between the first elevating device  77  and the second elevating device  78 . Hereinafter, an example in which the refrigerating device  30  is moved up and down by the second elevating device  78  will be described. 
     In the case of an indirect method using a refrigerant such as a cooling gas, a partial contact cooling method using a powdery or paste-like heat conductive material, or an existing cooling method using both of them, a cooling operation may take some time due to low thermal conductivity. In this case, it becomes difficult to suppress the temperature rise of the mounting table  20  at the time of repeated heat input during the film forming process, to quickly return to a target cooling temperature at that time, and to control the temperature of the substrate W. 
     On the other hand, in the substrate processing apparatus  100  according to the present embodiment, the cold link  35  of the refrigerating device  30  and the mounting table  20  are physically brought into contact with each other via the contacts  21   a  and  21   b  except during the film forming process. As a result, the thermal conductivity from the refrigerating device  30  to the mounting table  20  is increased by direct contact of the contacts  21   a  and  21   b , the cooling time of the substrate W can be shortened, and throughput can be enhanced. 
     The mounting table structure according to the present embodiment will be further described with reference to  FIGS. 3A to 3C .  FIGS. 3A to 3C  are diagrams illustrating the periphery of the contact of the mounting table structure according to the embodiment.  FIG. 3B  illustrates a surface of the contact  21   a  seen in a IIIB-IIIB direction of  FIG. 3A , and  FIG. 3C  illustrates an arrangement of the spring  26  and the like under the contact  21   a  seen in a IIIC-IIIC direction. 
     In  FIGS. 2A and 2B , a configuration in which the plurality of contacts  21   a  and the contacts  21   b  are in direct contact with each other has been described. At this time, since the mounting part  25  and the contact  21   b  are formed of copper (Cu) having high thermal conductivity, the contact  21   b  and the mounting part  25  are contact portions between metal workpieces. Therefore, as illustrated in  FIG. 2B , an indium sheet  23 , which is soft and has good thermal conductivity, is sandwiched between the contact  21   b  and the mounting part  25  to avoid contact between the metal workpieces and to prevent metal contamination. A metal sheet other than the indium sheet  23  may be used. 
     However, the mounting table  20  is not limited to a stacked structure of the mounting part  25  and the contact  21   b , and as illustrated in  FIG. 3A , the mounting part  25  and the contact  21   b  may be integrated into one plate. In this case, the plurality of contacts  21   a  and the mounting part  25  (a convex portion  25   a ) are in direct contact with each other. 
     In the present embodiment, a contact surface of the mounting part  25  that comes into contact with the plurality of contacts  21   a  is circular and flat. Meanwhile, as illustrated in  FIG. 3B , contact surfaces of the plurality of contacts  21   a  that come into contact with the mounting part  25  have a shape in which a circle having the same diameter as the contact surface of the mounting part  25  is divided into four on the inner peripheral side and eight on the outer peripheral side. As described above, it is preferable that the contact  21   a  is divided into a plurality of blocks, and the contact surface of the contact  21   a  is divided into a plurality of blocks. In the example of  FIG. 3B , the contact  21   a  is divided into 12 blocks and has 12 contact surfaces. More specifically, four contacts  21   a  having contact surfaces  21   a   2  having the same contact area are provided on the inner peripheral side, and eight contacts  21   a  having contact surfaces  21   a   1  having the same contact area are provided on the outer peripheral side. However, a shape of the contact surface of the contact  21   a  is not limited thereto. The shape of the contact surface of the contact  21   a  may be a circular shape, a quadrangular shape, or any other shape. The plurality of divided contact surfaces  21   a   1  and  21   a   2  of the contact  21   a  are flat surfaces. 
     When the contact  21   a  is not divided, the contact surface of the contact  21   a  becomes one surface, and thus the contact with the mounting part  25  may be partially performed. On the other hand, since the contact surface is divided by dividing into the plurality of contacts  21   a , the contact surface of the mounting part  25  easily comes into surface contact with the contact surfaces  21   a   1  and  21   a   2  of the plurality of contacts  21   a . As a result, a contact area between the plurality of contacts  21   a  and the mounting part  25  is increased as compared with a case in which the contact surface of the contacts  21   a  is not divided, and contact efficiency can be enhanced. 
     As an example illustrated in  FIG. 3C , one spring  26  is mounted on each of the contacts  21   a  divided into 12 blocks. Since the spring  26  is provided for each of the  12  contacts  21   a , a mechanism in which, when the plurality of contacts  21   a  and the mounting part  25  come into contact with each other, a force applied to each of the contacts  21   a  and the mounting part  25  can be absorbed by the spring  26  is formed. In other words, it is possible to avoid damage to the plurality of contacts  21   a  and the mounting part  25  by absorbing the force applied at the time of contact by the spring  26 . 
     When the contacts  21   a  and the mounting part  25  are brought into contact with each other, the contacts  21   a  and the mounting part  25  may not correctly come into contact with each other. Therefore, it is possible to make the contact by dividing the contact  21   a  into contact with the mounting part  25  more efficiently than to bring the contact  21   a  into contact with the mounting part  25  with a single plate, and the contact area increases. Further, when the plurality of springs  26  are provided, the contact between the contacts  21   a  and the mounting part  25  can be smoothly obtained by an elastic force. 
     The spring  26  is preferably disposed at the center of each of the contacts  21   a , but the present disclosure is not limited thereto. Further, the spring  26  is an example of an elastic body, and the elastic body may be a compression coil, a leaf spring, or the like. The plurality of contacts  21   a  are respectively connected to the plurality of springs  26 , and are mounted on the refrigerating device  30  or the mounting table  20  via the plurality of springs  26 . In the example of  FIGS. 3A to 3C, 12  each of the contacts  21   a  is connected to one of 12 springs  26  and the contacts  21   a  are mounted on the upper surface of the cold link  35  of the refrigerating device  30  via the  12  springs  26 . However, the contact  21   a  may be a single plate. When the contact  21   a  is a single plate, the plurality of springs  26  may be mounted between the contact  21   a  and the upper surface of the cold link  35 . 
     In the present embodiment, the springs  26  such as compression coils having the same diameter are disposed on the plurality of contacts  21   a , and the same number of springs  26  are disposed. However, for example, the springs  26  having different diameters may be disposed in the plurality of contacts  21   a . Thus, a degree of pressing of the contact surfaces  21   a   1  and  21   a   2  of the contacts  21   a  on the mounting part  25  can be changed. Further, the number of springs  26  disposed in each of the plurality of contacts  21   a  may be changed. As a result, the degree of pressing of the contact surfaces  21   a   1  and  21   a   2  of the contacts  21   a  on the mounting part  25  can be changed. 
     Further, as illustrated in  FIG. 3C , a copper plate  27  may be provided near the spring  26  mounted on each of the contacts  21   a . In the example of  FIG. 3C , two copper plates  27  are provided near the spring  26  of each of the contacts  21   a . The copper plate  27  is formed of a material such as a metal having high thermal conductivity such as copper in order to enhance heat transfer from the refrigerating device  30  to the plurality of contacts  21   a.    
     The number of copper plates  27  provided on each of the contacts  21   a  is not limited to two and may be one or three or more. The copper plate  27  is disposed outside the spring  26 , but is not limited thereto, and can be provided at a position at which the copper plate  27  does not interfere with an expansion and contraction operation of the spring  26 . For example, the copper plate  27  may be provided on the upper surface or the side surface of each of the contacts  21   a  as illustrated in  FIG. 3C . The number of copper plates  27  disposed in each of the plurality of contacts  21   a  may be changed. 
     When the substrate W on the mounting part  25  that is in direct contact with the plurality of contacts  21   a  from the refrigerating device  30  via the spring  26  is cooled, the cooling capacity from the refrigerating device  30  to the plurality of contacts  21   a  may be deteriorated by the spring  26 . Therefore, a plurality of copper plates  27  as heat transfer members are provided on the plurality of contacts  21   a . As a result, the thermal conductivity from the refrigerating device  30  to the plurality of contacts  21   a  can be increased, and the cooling efficiency of the mounting table  20  and the substrate W can be enhanced. 
     The plurality of copper plates  27  are an example of a plurality of heat transfer members connected to the plurality of contacts  21   a . The heat transfer member is not limited to the copper plate  27  and may be a conductive wire. The copper plate  27  has a structure that is thin to some extent and has high thermal conductivity to improve heat exchangeability without hindering an elastic force of the spring  26 . In other words, it is preferable that an example of the heat transfer member having the plurality of copper plates  27  has high heat transfer efficiency, does not have a function of a spring, and does not interfere with a function of the spring  26 . However, when the spring  26  itself is made of a material having high thermal conductivity, the copper plate  27  does not need to be provided. 
     As described above, the plurality of contacts  21   a  according to the present embodiment are mounted on the refrigerating device  30  via the plurality of springs  26  and the plurality of copper plates  27 . Further, it is possible to make direct contact between the plurality of contacts  21   a  and the mounting table  20  by moving the refrigerating device  30  up and down by the elevating drive part. As a result, it is possible to provide a substrate processing apparatus  100  that enhances heat transfer efficiency, improves the cooling efficiency of the substrate W, suppresses damage to the contact surface of the contact  21   a , and shortens the cooling time of the substrate W. 
     [Other Structures] 
     The contact provided between the cold link  35  and the mounting table  20  may be disposed only on the side of the cold link  35 , may be disposed only on the side of the mounting table  20 , or may be disposed on two sides of the cold link  35  and the mounting table  20 . 
     In the substrate processing apparatus  100 , at the time of the film forming process, an operation in which the contact is separated from the cold link  35  or the mounting table  20 , and before and after the film forming process, the contact is brought into contact with the cold link  35  or the mounting table  20  is repeatedly performed for each of the film forming processes of the substrate W. Therefore, as illustrated in  FIGS. 2 and 3A to 3C , preferably, the surfaces of the contact  21   a  and/or the contact  21   b  are surface-treated with hard silver platings  29  and  24  so that the surfaces of the contacts  21   a  and  21   b  have both durability against contact and separation, and thermal conductivity. The hard silver platings  29  and  24  suppress wear of the contact surfaces of the contacts  21   a  and  21   b  during the contact and separation, and both the durability and the thermal conductivity of the contacts  21   a  and  21   b  can be achieved at the same time. Not only the contact surfaces of the contacts  21   a  and  21   b , but also the other surfaces of the contacts and the lower surface (the contact surface) of the mounting part  25  may be surface-treated with the hard silver platings  29  and  24 . 
     The contact surfaces of the contacts  21   a  and  21   b  are flat. The contact surfaces of the contacts  21   a  and  21   b  are processed so that flatness thereof is within 0.01 mm and plane roughness Ra is within 0.4. As a result, the contact area between the contact  21   a  and the contact  21   b , or between the contact  21   a  and the mounting part  25  can be made larger, the efficiency of heat conduction can be enhanced, and cooling efficiency can be further enhanced. 
     The spring  26  and the copper plate  27  connected to the contact  21   a  may be provided on the side of the mounting table  20 , for example, as illustrated in  FIG. 4 . In the example of  FIG. 4 , the spring  26  and the copper plate  27  are connected to the contact  21   b  under the mounting part  25 , and the plurality of contacts  21   a  are disposed to be suspended in a downward direction of the spring  26  and the copper plate  27 . In this example, the plurality of contacts  21   a  are provided on the side of the mounting table  20  and come into contact with the upper surface of the cold link  35  of the refrigerating device  30 . 
     As a contact method of the contact, a metal sealing material such as a metal O-ring or Acti-seal having thermal conductivity and springiness may be used instead of the block-shaped contacts  21   a  and  21   b . However, since the block-shaped contacts  21   a  and  21   b  can have a large contact area and have high cooling efficiency, the block-shaped contacts are preferable in consideration of heat exchangeability. The metal sealing material such as a metal O-ring or Acti-seal may be mounted on the contact surface of each of the block-shaped contacts  21   a  and  21   b.    
     A driving method of the refrigerating device  30 , that is, a driving method of the second elevating device  78  may be an air cylinder or a motor. However, the air cylinder is preferable in that the refrigerating device  30  can be moved up and down only by controlling the on and off of air supply, and control is easy. Regarding the up and down movement of the refrigerating device  30 , a stroke of the refrigerating device  30  may be controlled by providing a stopper, which detects the moment when the contact  21   a  comes into contact with the mounting part  25  or the contact  21   b  and stops the supply of air, to control the supply of the air cylinder. 
     When the refrigerating device  30  is driven by a motor, a ball screw or the like is required, and a required space is larger than that in driving by the air cylinder. Further, since the motor needs to be provided coaxially with the refrigerating device  30 , a size of a device increases. In this way, it is possible to save space by adopting a method of driving the refrigerating device  30  by the air cylinder. However, the refrigerating device  30  may be driven by a motor. 
     As illustrated in  FIGS. 2 to 4 , a radiation plate  28  may be provided around the refrigerating device  30  and the contacts  21   a  and  21   b.    
     As described above, according to the mounting table structure and the substrate processing apparatus  100  having the mounting table structure of the present embodiment, a contact structure with a contact connected to the refrigerating device  30  can improve the thermal conductivity from the refrigerating device  30  to the mounting table  20 . As a result, the cooling efficiency of the substrate can be enhanced, and the time required for cooling the substrate W and returning to room temperature can be shortened. 
     [Operation of Substrate Processing Apparatus and Contact and Separation of Contact] 
     Next, an operation of the substrate processing apparatus  100  and contact and separation states of the contacts  21   a  and  21   b  will be described with reference to  FIG. 5 .  FIG. 5  is a diagram illustrating an example of the operation of the substrate processing apparatus  100  and the state of the contacts according to the embodiment. 
     In the substrate processing apparatus  100 , the refrigerating device  30  is moved up and down by moving the second elevating device  78  up and down by an air cylinder, and the refrigerating device  30  and the mounting table  20  are brought into contact with or separated from each other via the contacts  21   a  and  21   b . As a result, in the substrate processing apparatus  100 , contact (direct) cooling by the contacts  21   a  and  21   b  can be performed. Hereinafter, the contact and separation states of the contacts  21   a  and  21   b  when the substrate W is processed by the substrate processing apparatus  100  will be sequentially described. 
     First, as illustrated in (1) of  FIG. 5 , when the substrate W is loaded, the refrigerating device  30  is lifted by moving the second elevating device  78  up, and the contacts  21   a  and  21   b  are brought into contact with each other (the state of  FIG. 2A ). At this time, the rotation operation by the rotating device  40  is stopped, and the mounting table  20  is not rotating. 
     Next, as illustrated in (2) of  FIG. 5 , a DC voltage is applied to the chuck electrode  32 , and the substrate W is cooled in a state in which the substrate W is suctioned by the electrostatic chuck. Following the (1) of  FIG. 5 , the contacts  21   a  and  21   b  are in a contact state (the state of  FIG. 2A ). At this time, the rotation operation by the rotating device  40  is stopped. 
     Next, as illustrated in (3) of  FIG. 5 , immediately before a process (for example, the film forming process) is performed, the refrigerating device  30  is moved down by moving the second elevating device  78  down, and the contacts  21   a  and  21   b  are separated from each other during the process (the state of  FIG. 2B ). At this time, the contact between the contacts  21   a  and  21   b  illustrated by A in  FIG. 2A  becomes a non-contact (separated) state illustrated by A in  FIG. 2B , and the spring  26  illustrated by B in  FIG. 2A  extends as illustrated by B in  FIG. 2B . Further, at this time, the rotation operation is performed by the rotating device  40 , and the film forming process is performed on the substrate W in a state in which the mounting table  20  is rotated. 
     In the present embodiment, when the cooling structure (including the contact  21   a  on the cooling side) is formed in a block structure having a large volume, it is possible to enhance thermal conductivity at the time of contact. Further, for example, when the mounting table  20  (the contact  21   b  on the cooled side) is formed in a block structure having a large volume, cold storage efficiency at the time of separation can be enhanced. 
     Further, it is possible to reduce the wear at the time of contact and to enhance reproducibility of a contact pressure by providing the spring  26  on the contact. The spring  26  may be provided on the side of the mounting table, and pressing pressure at the time of contact can be adjusted by the plurality of springs  26 . 
     Next, the application of the DC voltage to the chuck electrode  32  is stopped, and the substrate W is unloaded as illustrated in (4) of  FIG. 5  in a state in which the substrate W is not suctioned on the mounting table  20  due to an electrostatic elimination process. At this time, the rotation operation by the rotating device  40  is not performed, and the mounting table  20  is not rotating. The refrigerating device  30  is moved up by moving the elevating device  78  up and down, and the contacts  21   a  and  21   b  are in contact with each other (the state illustrated in  FIG. 2A ). 
     Next, as illustrated in (5) of  FIG. 5 , when the substrate W is idling after it is unloaded (waiting for the substrate W to be loaded), the contacts  21   a  and  21   b  are kept in the contact state (the state of  FIG. 2A ). At this time, the rotation operation by the rotating device  40  is stopped. When the next substrate W is loaded, the process returns to (1) of  FIG. 5 , and the processes of (1) to (5) of  FIG. 5  are performed. 
     [Method of Controlling Substrate Processing Apparatus] 
     Next, a method of controlling the substrate processing apparatus  100  according to the embodiment will be described with reference to  FIG. 6 .  FIG. 6  is a flowchart illustrating an example of the method of controlling the substrate processing apparatus  100  according to the embodiment. The process of  FIG. 6  is controlled by the controller  80 . A solid line arrow indicates a processing direction when the temperature of the mounting part  25  on which the substrate W is mounted is normal, and a broken line arrow indicates a processing direction when the temperature of the mounting part  25  is abnormal. 
     When this processing is started, before the substrate W mounted on the mounting part  25  of the mounting table  20  is processed, the controller  80  causes the refrigerating device  30  to be moved up and down by the second elevating device  78  and controls the contacts to be brought into contact with the refrigerating device  30  or the mounting part  25  (Step  1 ). 
     Due to the control of Step S 1 , for example, in the example of  FIG. 2A , the contact  21   a  comes into contact with the mounting part  25  via the contact  21   b . Further, for example, in the example of  FIG. 4 , the contact  21   a  comes into contact with the cold link  35 . As a result, the controller  80  directly cools the mounting part  25  from the refrigerating device  30  (Step S 2 ). When the temperature of the mounting part  25  reaches a saturated state and the mounting part  25  is stabilized at a predetermined temperature (Step S 3 ), the controller  80  loads the substrate W (Step S 4 ). On the other hand, when the temperature of the mounting part  25  does not reach the saturation state in Step S 3  and the temperature of the mounting part  25  is abnormal, the controller  80  does not load the substrate W and returns to Step S 2 . In Step S 2 , the mounting part  25  is cooled again by the refrigerating device  30 , and the processes of Steps S 2  and S 3  are repeated until the temperature of the mounting part  25  reaches the saturated state. 
     After the substrate W is loaded in Step S 4 , the controller  80  applies a DC voltage to the chuck electrode  32  and controls the substrate W to be contact-cooled in a state in which the substrate W is suctioned by the electrostatic chuck (Step S 5 ). Further, the controller  80  controls so that the first cooling gas (for example, He gas) is supplied from the refrigerant supply flow path  51  to a space in which the spring  26  is disposed, and the second cooling gas (for example, He gas) is supplied from the second cooling gas supply pipe  34  to a space between the lower surface of the substrate W and the upper surface of the mounting part  25 . 
     Next, the controller  80  controls the contact  21   a  to be separated from the mounting part  25  in order to perform the film forming process (Step S 6 ). As a result, as illustrated in  FIG. 2B , the contact  21   a  is separated from the mounting part  25  via the contact  21   b . However, when the mounting table  20  is not rotated during the film forming process, the process may proceed to Step S 7  without performing the process of Step S 6 . 
     Due to Step S 6 , the contact  21   a  is separated from the mounting part  25 , and the mounting part  25  can be rotated. The controller  80  controls the substrate W to be subjected to a desired film forming process while the mounting part  25  is rotated by the rotating device  40  (Step S 7 ). However, when the film forming process is performed without rotating the mounting part  25 , the controller  80  performs Step S 6  or does not perform Step S 6  and then performs the film forming process on the substrate W without rotating the substrate W. The controller  80  stops the rotation of the mounting table  20  by the rotating device  40  after the film forming process on the substrate W is performed. 
     Next, the controller  80  causes the refrigerating device  30  to be moved up by the second elevating device  78 , controls the contact  21   a  to be brought into contact with the mounting part  25  via the contact  21   b , and cools the mounting part  25  by the refrigerating device  30  (Step S 8 ). Then, the controller  80  unloads the substrate W (Step S 9 ) and finishes this processing. 
     In Steps S 4  to S 8 , when it is determined that the temperature of the mounting part  25  is abnormal because it exceeds a predetermined threshold value, the controller  80  stops the process (Step S 10 ) and returns to the process of bringing the contacts  21   a  and  21   b  of Step S 2  into contact with each other and cooling the mounting part  25 . In this case, the controller  80  performs the processing after Step S 2  again. 
     Further, in the method of controlling the substrate processing apparatus  100  of  FIG. 6 , the refrigerating device  30  is moved up and down by the second elevating device  78 , and the contacts are brought into contact with or separated from the refrigerating device  30  or the mounting table  20 . However, the present disclosure is not limited thereto, and for example, the refrigerating device  30  may be moved up and down by the first elevating device  77 , and the contacts may be brought into contact with or separated from the refrigerating device  30  or the mounting table  20 . 
     It should be considered that the mounting table structure, the substrate processing apparatus, and the method of controlling the substrate processing apparatus according to the embodiments disclosed herein are exemplary in all respects and should be considered as not being restrictive. The embodiments may be modified and improved in various forms without departing from the scope of the appended claims and their gist. The matters described in the plurality of embodiments may have other configurations within a non-contradictory range and may be combined within a non-contradictory range.