Patent Publication Number: US-2023136720-A1

Title: Substrate support, plasma processing apparatus, and plasma processing method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application Nos. 2021-178173 filed on Oct. 29, 2021 and 2022-156563 filed on Sep. 29, 2022, respectively, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a substrate support, a plasma processing apparatus and a plasma processing method. 
     BACKGROUND 
     Japanese Laid-open Patent Publication No. 2015-084350 discloses a temperature control mechanism having multiple sets of a heater and a thyristor, wherein at least one set of the heater and the thyristor is provided corresponding to each of multiple areas which are provided by subdividing an electrostatic chuck having a substrate mounted thereon, a single power supply that supplies current to the heaters from the multiple sets of thyristors, and at least one set of filters provided in a power line supplying power to the multiple heaters from the single power supply and removing high-frequency power applied to the power supply. 
     SUMMARY 
     A technique according to the present disclosure appropriately adjusts a temperature of a substrate supported on a substrate support to maintain electrostatic adsorption even in a high-temperature range. 
     In accordance with an aspect of the present disclosure, there is provided a substrate support, comprising a base, a first ceramic layer on the base, and a second ceramic layer above the first ceramic layer, wherein the first ceramic layer has a first base portion made of a first ceramic, and a plurality of heater electrodes included in the first base portion and for adjusting a temperature of the substrate, and wherein the second ceramic layer has a second base portion made of a second ceramic different from the first ceramic, and a chucking electrode included in the second base portion and for holding the substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is an explanatory diagram schematically illustrating a configuration of a plasma processing system according to an exemplary embodiment. 
         FIG.  2    is a cross-sectional view illustrating an example of a configuration of a plasma processing apparatus according to an exemplary embodiment. 
         FIG.  3    is a cross-sectional view illustrating an example of a substrate support according to an exemplary embodiment. 
         FIG.  4    is a plan view illustrating an example of a constitution of multiple areas of a first base according to an exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     In a manufacturing process of a semiconductor device, desired processing is performed to a semiconductor substrate (hereinafter referred to as “substrate”) in a state in which the semiconductor substrate is mounted on a substrate support. A substrate mounted on a ceramic member constituting a substrate support surface of the substrate support is adjusted to an appropriate temperature according to the manufacturing process. Japanese Laid-open Patent Publication No. 2015-084350 proposes a substrate support configured to include a heater electrode jointly with a chucking electrode in the ceramic member and have both fixation support of the substrate on the ceramic member and temperature adjustment of the substrate. In particular, Japanese Laid-open Patent Publication No. 2015-084350 discloses subdividing the heater electrode provided inside the substrate support and locally adjusting a temperature of each of multiple areas. 
     The fixation support of the substrate in the ceramic member is performed by applying voltage to the substrate support surface by the chucking electrode embedded in the ceramic member. When the substrate support surface is applied with the voltage by the chucking electrode, a potential difference is generated between the substrate support surface and a substrate polarized with an electric charge opposite to the electric charge of the substrate support surface to generate adsorptive force by coulomb force. The ceramic member constituting the substrate support surface is constituted by ceramics which is a dielectric, but this is to have a dielectric that efficiently makes the application of the voltage by the chucking electrode contribute to adsorptive power and have an insulation that insulates the substrate and the substrate support surface so that current does not flow between the substrate and the substrate support surface. Regarding insulation, if the current flows between the substrate and the substrate support surface, the potential difference between the substrate and the substrate support surface decreases, and the adsorption force thus decreases. 
     However, in recent years, in a plasma etching device, etching a film of the substrate including metal is required to be performed with high precision as a next-generation semiconductor device. For the implementation, in the substrate support, it is required to adjust the substrate in a high-temperature range higher than 200C (hereinafter, just referred to as high-temperature range) or to uniformly or locally adjust an in-plane temperature of the substrate even in the high-temperature range. Further, in the present disclosure, uniformly adjusting the temperature of the substrate refers to a case where there is no difference in in-plane temperature in an entire area of the substrate or the difference is small enough to be ignored. Further, in the present disclosure, locally adjusting the temperature of the substrate refers to a case where, by adjusting a predetermined part of the substrate to a desired temperature, there is no difference in the predetermined part or the difference is small enough to be ignored. 
     The substrate support disclosed in Japanese Laid-open Patent Publication No. 2015-084350 enables uniformly or locally adjusting the temperature in a conventional etching temperature, i.e., a temperature range lower than 200° C., but does not assume the temperature adjustment for the high-temperature range and may not be adopted in the high-temperature range. Specifically, according to the examination of the present inventor, if the temperature of the substrate support disclosed in Japanese Laid-open Patent Publication No. 2015-084350 is adjusted to a high-temperature range, the volume resistance of the ceramic member that constitutes the substrate support surface decreases and the insulation thus decreases. Further, it is known that the ceramic member in which the insulation decreases does not maintain electrostatic adsorption because the adsorption force between the substrate and the substrate support surface decreases due to the aforementioned reason, and a problem such as substrate deviation occurs. Therefore, a substrate support which maintains the electrostatic adsorption even in the high-temperature range and is capable of uniformly or locally adjusting the in-plane temperature of the substrate is required. 
     Therefore, the technology according to the present disclosure as a substrate support capable of fixing and supporting the substrate by the electrostatic adsorption and adjusting the temperature provides a substrate support which maintains the electrostatic adsorption even in the high-temperature range and is capable of uniformly or locally adjusting the in-plane temperature of the substrate. 
     Hereinafter, a configuration of a substrate processing apparatus according to an exemplary embodiment will be described with reference to drawings. Further, in the present specification, the same reference numerals are given to elements having substantially the same functional configuration, so a redundant description will be omitted. 
     &lt;Plasma Processing System&gt; 
       FIG.  1    is an explanatory diagram schematically illustrating a configuration of a plasma processing system according to an exemplary embodiment. In an exemplary embodiment, a plasma processing system includes a plasma processing apparatus  1  and a controller  2 . The plasma processing apparatus  1  includes a plasma processing chamber  10 , a substrate support portion  11 , and a plasma generation portion  12 . The plasma processing chamber  10  has a plasma processing space. Further, the plasma processing chamber  10  includes at least one gas supply port for supplying at least one processing gas to the plasma processing space and at least one discharge port for discharging gas from the plasma processing space. The gas supply port is connected to a gas supply portion  20  to be described below and the gas discharge port is connected to an exhaust system  40  to be described below. The substrate support portion  11  is disposed in the plasma processing space, and has a substrate support surface for supporting a substrate. 
     The plasma generation portion  12  is configured to generate plasma from at least one processing gas supplied in the plasma processing space. The plasma formed in the plasma processing space may be capacitively coupled plasma (CCP), inductively coupled plasma (ICP), electron-cyclotron-resonance plasma (ECR plasma), helicon wave plasma (HWP), or surface plasma (SWP). Further, various types of plasma generation portions may be used, which include an alternating current (AC) plasma generation portion and a direct current (DC) plasma generation portion. In an exemplary embodiment, an AC signal (AC power) used in the AC plasma generation portion has a frequency in a range of 100 kHz to 10 GHz. Therefore, the AC signal includes a radio frequency (RF) signal and a microwave signal. In an exemplary embodiment, the RF signal has a frequency in a range of 200 kHz to 150 MHz. 
     The controller  2  processes a computer executable command which allows the plasma processing apparatus  1  to execute various processes described in the present disclosure. The controller  2  may be configured to control each element of the plasma processing apparatus  1  so as to execute various processes described herein. In an exemplary embodiment, a part or the entirety of the controller  2  may be included in the plasma processing apparatus  1 . The controller  2  may include, for example, a computer  2   a.  The computer  2   a  may include a central processing unit (CPU)  2   a   1 , a memory portion  2   a   2 , and a communication interface  2   a   3 , for example. The CPU  2   a   1  may be configured to perform various control operations based on a program stored in the memory portion  2   a   2 . The storage portion  2   a   2  may include a random access memory (RAM), a read only memory (ROM), a hard disk drive (HDD), a solid state drive (SSD), or a combination thereof. The communication interface  2   a   3  may communicate with the plasma processing apparatus  1  through a communication line such as local area network (LAN), etc. 
     &lt;Plasma Processing Apparatus&gt; 
     Next, as an example of the plasma processing apparatus  1 , an example of a configuration of a capacitively coupled plasma processing apparatus will be described by using  FIG.  2   . The plasma processing apparatus  1  includes a plasma processing chamber  10 , a gas supply portion  20 , a power supply  30 , and an exhaust system  40 . Further, the plasma processing apparatus  1  includes a substrate support portion  11  and a gas introduction portion. The gas introduction portion is configured to introduce at least one processing gas into the plasma processing chamber  10 . The gas introduction portion includes a shower head  13 . The substrate support portion  11  is disposed in the plasma processing chamber  10 . The shower head  13  is disposed above the substrate support portion  11 . In an exemplary embodiment, the shower head  13  constitutes at least a part of a ceiling of the plasma processing chamber  10 . The plasma processing chamber  10  includes the shower head  13 , a side wall  10   a  of the plasma processing chamber  10 , and a plasma processing space  10   s  defined by the substrate support portion  11 . The side wall  10   a  is grounded. The shower head  13  and the substrate support portion  11  are electrically insulated from a housing of the plasma processing chamber  10 . 
     The substrate support portion  11  includes a substrate support  111  and a ring assembly  112 . The substrate support  111  has a central area  111   a  for supporting the substrate (wafer) W and a ring-shaped area  111   b  (ring support surface)  111   b  for supporting the ring assembly  112 . The ring-shaped area  111   b  of the substrate support  111  surrounds the central area  111   a  of the substrate support  111  in a plan view. The substrate W is disposed on the central area  111   a  (substrate support surface  114 ) of the substrate support  111 , and the ring assembly  112  is disposed on the ring-shaped area  111   b  of the substrate support  111  to surround the substrate W on the substrate support surface  114 . In an exemplary embodiment, the substrate support  111  includes a base  120  and an electrostatic chuck  122 . The base  120  includes a conductive member  123 . The conductive member  123  of the base  120  serves as a lower electrode. The electrostatic chuck  122  is disposed on the base  120 . An upper surface of the electrostatic chuck  122  has the substrate support surface  114 . Configurations of the base  120  and the electrostatic chuck  122  will be described below in detail. The ring assembly  112  includes one or a plurality of ring-shaped members. Further, the substrate support portion  11  may include a temperature control module configured to control at least one of the electrostatic chuck  122 , the ring assembly  112 , and the substrate W to a target temperature. The temperature control module may include a heater, a heating medium, a path, and a combination thereof. In the path, a heating fluid such as brine or gas flows. Further, the substrate support portion  11  may include a heating gas supply portion configured to supply heating gas between a back surface of the substrate W and the substrate support surface  114 . 
     The shower head  13  is configured to introduce at least one processing gas from the gas supply portion  20  into the plasma processing space  10   s.  The shower head  13  includes at least one gas supply port  13   a,  at least one gas diffusion chamber  13   b,  and a plurality of gas introduction ports  13   c . The processing gas supplied to the gas supply port  13   a  is introduced into the plasma processing space  10   s  from the plurality of gas introduction ports  13   c  by passing through the gas diffusion chamber  13   b.  Further, the shower head  13  includes the conductive member. The conductive member of the shower head  13  serves as an upper electrode. Further, the gas introduction portion may include one or a plurality of side gas injectors (SGI) mounted on one or a plurality of openings formed on the side wall  10   a  in addition to the shower head  13 . 
     The gas supply portion  20  may include at least one gas source  21  and at least one flow rate controllers  22 . In an exemplary embodiment, the gas supply portion  20  is configured to supply at least one processing gas to the shower head  13  from the gas sources  21  corresponding to each processing gas, through the flow controllers  22  corresponding thereto, respectively. Each flow rate controller  22  may include, for example, a mass-flow controller or a pressure control type flow rate controller. Further, the gas supply portion  20  may include at least one flow rate modulation device which modulates or pulses the flow rate of at least one processing gas. 
     The power supply  30  includes an RF power supply  31  coupled to the plasma processing chamber  10  through at least one impedance matching circuit. The RF power supply  31  is configured to supply at least one RF signal (RF power) such as a source RF signal and a bias RF signal to the conductive member of the substrate support portion  11  and/or the conductive member of the shower head  13 . Therefore, plasma is formed from at least one processing gas supplied to the plasma processing space  10   s.  Therefore, the RF power supply  31  may serve as at least a part of the plasma generation portion  12 . Further, by supplying the bias RF signal to the conductive member of the substrate support portion  11 , a bias potential may be generated on the substrate W and ion components in the generated plasma may be drawn to the substrate W. 
     In an exemplary embodiment, the RF power supply  31  includes a first RF generation portion  31   a  and a second RF generation portion  31   b.  The first RF generation portion  31   a  is configured to be coupled to the conductive member of the substrate support portion  11  and/or the conductive member of the shower head  13  through at least one impedance matching circuit, and to generate a source RF signal (source RF power) for plasma generation. In an exemplary embodiment, the source RF signal has a frequency in a range of 13 MHz to 150 MHz. In an exemplary embodiment, the first RF generation portion  31   a  may be configured to generate a plurality of source RF signals having different frequencies. One or a plurality of source RF signals which are generated are supplied to the conductive member of the substrate support portion  11  and/or the conductive member of the shower head  13 . The second RF generation portion  31   b  is configured to be coupled to the conductive member of the substrate support portion  11  through at least one impedance matching circuit, and to generate the bias RF signal (bias RF power). In an exemplary embodiment, the bias RF signal has a lower frequency than the source RF signal. In an exemplary embodiment, the bias RF signal has a frequency in a range of 400 kHz to 13.56 MHz. In an exemplary embodiment, the second RF generation portion  31   b  may be configured to generate a plurality of bias RF signals having different frequencies. One or a plurality of bias RF signals generated is supplied to the conductive member of the substrate support portion  11 . Further, in various exemplary embodiments, at least one of the source RF signal and the bias RF signal may be pulsed. 
     Further, the power supply  30  may include the DC power supply  32  coupled to the plasma processing chamber  10 . The DC power supply  32  includes a first DC generation portion  32   a  and a second DC generation portion  32   b.  In an exemplary embodiment, the first DC generation portion  32   a  is configured to be connected to the conductive member of the substrate support portion  11  and generate a first DC signal. The generated first DC signal is applied to the conductive member of the substrate support portion  11 . In an exemplary embodiment, the first DC signal may be applied to an electrode different from the electrode in the electrostatic chuck  122 . In an exemplary embodiment, the second DC generation portion  32   b  is configured to be connected to the conductive member of the shower head  13  and generate a second DC signal. The generated second DC signal is applied to the conductive member of the shower head  13 . In various exemplary embodiments, the first and second DC signals may be pulsed. Further, the first and second DC generation portions  32   a  and  32   b  may be provided in addition to the RF power supply  31  or the first DC generation portion  32   a  may be provided instead of the second RF generation portion  31   b.    
     The exhaust system  40  may be connected to a gas outlet  10   e  provided on a bottom of the plasma processing chamber  10 , for example. The exhaust system  40  may include a pressure adjustment valve and a vacuum pump. By the pressure adjustment valve, pressure in the plasma processing space  10   s  is adjusted. The vacuum pump may include a turbo molecule pump, a dry pump, or a combination thereof. 
     &lt;Substrate Support&gt; 
     Next, the substrate support  111  according to the exemplary embodiment will be described in detail.  FIG.  3    is an explanatory diagram schematically illustrating a configuration of a substrate support  111  according to an exemplary embodiment. Further,  FIG.  3    illustrates a part of a central area  111   a  of the substrate support  111 , and the other portion of the central area  111   a  and the ring-shaped area  111   b,  and a lower portion of the base  120  are not illustrated. However, the other portion of the central area  111   a  and the ring-shaped area  111   b  have a similar configuration to some illustrated components. 
     In  FIG.  3   , the substrate support  111  includes the base  120  and the electrostatic chuck  122 . The conductive member  123  of the base  120  uses aluminum as a material, and includes a cooling path  124  inside the base  120 . The electrostatic chuck  122  has a first ceramic layer  126  provided above the base  120  and a second ceramic layer  128  provided above the first ceramic layer  126 . Further, as the conductive member  123  of the base  120 , an appropriate metallic material may be used in addition to aluminum. 
     The first ceramic layer  126  is mounted on the base  120 . The method of mounting is not particularly limited, and the first ceramic layer  126  may be fixed and mounted using a known means. In addition, the first ceramic layer  126  includes a first base portion  130  which is a sintered body of the first ceramic, a plurality of heater electrodes  132 , and a multi-layered electrical wiring  134  provided on multiple layers and connected to the plurality of heater electrodes  132 . The first base portion  130  is configured to include the plurality of heater electrodes  132 , the multi-layered electrical wirings  134  provided on multiple layers and connected to the plurality of heater electrodes  132 , and an electrical wiring  144  connected to the chucking electrode in a second ceramic layer  128  to be described below. Further, in the present disclosure, “include” means, for example, a state in which one component includes another component includes a state in which the another component is buried in the component and not exposed to the outside, and a state in which a part of the another component is buried inside the component and the other portion of the another component is exposed to the outside. 
     The second ceramic layer  128  is provided above the first ceramic layer  126 , and in the exemplary embodiment, the second ceramic layer  128  is bonded to the first ceramic layer  126  with an adhesive layer  136  made of an inorganic adhesive, which is interposed therebetween. Further, the second ceramic layer  128  includes a second base portion  140  which is a sintered body of a second ceramic, and a chucking electrode  142 . The second base portion  140  is configured to include the chucking electrode  142  and the electrical wiring  144  connected to the chucking electrode  142 . In the exemplary embodiment, the chucking electrode  142  may adopt an HV electrode and provides electrostatic adsorption between the substrate support surface  114  and a substrate W which is not illustrated by applying DC voltage to the chucking electrode  142 . 
     The multi-layered electrical wiring  134  connected to the heater electrode  132 , and the electrical wiring  144  connected to the chucking electrode  142  are connected to a power supply which is not illustrated through the inside or the outside of the base  120 . As a result, the base  120  is configured to include the multi-layered electrical wiring  134  and the electrical wiring  144 . 
     Here, in the substrate support  111  configured as above, an example of a manufacturing method of the electrostatic chuck  122  will be described below. 
     A manufacturing method of the first ceramic layer  126  is capable of adopting a green sheet method. Specifically, it is possible to manufacture the first ceramic layer  126  by stacking and sintering a plurality of green sheets respectively constituted by first ceramics separately sintered. Further, the green sheet is acquired by forming a material using a ceramic as a main ingredient in a sheet shape. The ceramic layer as a multi-layered structure constituting the electrostatic chuck may be formed by sintering the green sheet. As described above, since the first base portion  130  includes the plurality of heater electrodes  132 , and the multi-layered electrical wirings  134  connected thereto, a green sheet method is very suitable for manufacturing the first ceramic layer  126  having such a complicated internal structure. Specifically, when the multi-layered structure is formed by stacking the plurality of green sheets by the green sheet method, the green sheets may be stacked so that the heater electrode or the electrical wiring is provided between respective layers. Therefore, it is preferable that the first ceramic as the material is a ceramic applicable to the green sheet method, and adopts alumina in the exemplary embodiment. 
     A manufacturing method of the second ceramic layer  128  is capable of adopting a hot press method. As the second ceramic which is the material, alumina at 99.95% or more as a mass percent concentration, and high-purity alumina in which a porous rate is 0.1% or less may be used. Here, the porous rate is a value representing a ratio of a total sum of areas of all porosities included in an observation visual field to an area of the observation visual field of the corresponding cross section when the cross section of the second ceramic layer  128  is observed. The hot press method is used for the high-purity alumina, and the second ceramic layer  128  may be manufactured, which has high volume resistance even in the high-temperature area, specifically, volume resistance of 1×10 16 Ω or more at a room temperature or more and a temperature of 350° C. or less, and a dielectric constant of 10 to 11. 
     The first ceramic layer  126  and the second ceramic layer  128  manufacturing as such are bonded through the adhesive layer  136  made of, for example, the inorganic adhesive. A reason for using the inorganic adhesive may be that thermal resistance is low. The reason is that since heat is input into the second ceramic layer  128  from the heater electrode  132  of the first ceramic layer  126 , the adhesive layer  136  provided therebetween preferably has low thermal resistance. Further, it is preferable to use the inorganic adhesive because deterioration of the adhesive layer  136  is small even when the adhesive layer  136  is exposed to plasma on an outer periphery of the substrate support  111 . 
     An advantage of configuring the substrate support  111  according to the exemplary embodiment as above will be described below. As described above, in the electrostatic chuck  122  in the related art, the volume resistance of the ceramic member constituting the substrate support surface  114  decreases in the high-temperature range, so current may flow between the substrate support surface  114  and the substrate W. In this case, the electrostatic adsorption is not maintained, and the substrate W is deviated from a desired position, so there is a concern about exerting a bad influence on a subsequent process. 
     In order to hold the electrostatic adsorption between the substrate W and the substrate support surface  114  in the high-temperature range, using a ceramic member having high volume resistance in the high-temperature range so that the current does not flow between the substrate W and the substrate support surface  114  is considered. It is possible to manufacture the ceramic member having the high volume resistance in the high-temperature range may be manufactured by using the hot press method for the high-purity alumina as described above. Meanwhile, it is preferable to manufacture a ceramic member in which the plurality of heater electrodes  132  is included in the high-purity alumina by the green sheet method. 
     In this regard, according to a result in which the present inventor further repeats the examination, it is learned that the first ceramic layer  126  including the plurality of heater electrodes  132  is manufactured by the green sheet method, the second ceramic layer  128  including the chucking electrode  142  and having the high volume resistance in the high-temperature range is manufactured by the hog press method, and two types of layers are bonded to form the electrostatic chuck  122  that solves the problem. That is, the electrostatic chuck  122  according to the exemplary embodiment enables uniformly or locally adjusting the temperature in the high-temperature range by the first ceramic layer  126  including the plurality of heater electrodes  132 , and enables maintaining the electrostatic adsorption in the high-temperature by the second ceramic layer  128  including the chucking electrode  142  and having the volume resistance in the high-temperature range. Further, when different ceramic materials are bonded, if the ceramic materials are deformed upon heating or cooling, a warpage accompanied by a different in thermal coefficient of the ceramic materials is concerned. In this regard, in the electrostatic chuck  122  according to the exemplary embodiment, since both the first ceramic layer  126  and the second ceramic layer  128  use alumina as the main material, the difference in thermal expansion of the first ceramic layer  126  and the second ceramic layer  128  may be suppressed to be small, so the concern is resolved. 
     According to the above exemplary embodiment, temperatures of the plurality of heater electrodes  132  may be controlled independently by the multi-layered electrical wiring  134 . Further, provided is the substrate support  111  in which the first ceramic layer  126  including the plurality of heater electrodes  132  enables uniformly or locally adjusting the temperature of the substrate W even in the high-temperature range, and the second ceramic layer  128  including the chucking electrode  142  and having the high volume resistance in the high-temperature range enables maintaining the electrostatic adsorption of the substrate W in the high-temperature range. 
     In an exemplary embodiment, the first base portion  130  includes a plurality of areas  200  in plan view, and the plurality of heater electrodes  132  is disposed every the plurality of areas  200 . That is, one or two or more heater electrodes  132  are provided to correspond to one area  200 , and each of the heater electrodes  132  adjusts the temperature of each of the plurality of corresponding areas  200 . 
       FIG.  4    illustrates an example in which the number, shapes, and arrangement of multiple areas  200  are very suitable in the first base portion  130  as a plan view when the first base portion  130  according to an exemplary embodiment is viewed from the top. In  FIG.  4   , each area surrounded by a solid line is one area  200 . The first base portion  130  includes a plurality of areas  200  of which shapes and arrangement rotatably symmetric to a circumference around the center of the first base portion  130 . In the example illustrated in  FIG.  4   , the plurality of areas  200  are rotatably symmetric to each other at 90 degrees around the center of the first base portion  130 . Specifically, the plurality of areas  200  includes one first area  200   a  positioned and provided at the center of the first base portion  130 , four second areas  200   b  positioned and provided at an outer periphery side of the first area  200   a,  eight third areas  200   c  positioned at the outer periphery side of the second area  200   b,  and one fourth area  200   d  positioned and provided at an outer periphery of the third area  200   c,  i.e., the outer periphery of the first base portion  130 . The heater electrode  132  is provided to correspond to each of the plurality of areas  200 . In an exemplary embodiment, the heater electrode  132  having a shape which is the same as the shape of one area  200  is provided to correspond to one area  200 . 
     The first base portion  130  includes the plurality of areas  200  on the plan view, and the plurality of heater electrodes are arranged every the plurality of areas  200  to adjust the temperature of each of the plurality of areas  200  by the plurality of heater electrodes. This enables more efficiently locally adjusting the temperature to more uniformly adjust the in-plane temperature of the substrate W. 
     &lt;Plasma Processing Method&gt; 
     Next, a plasma processing method using the plasma processing apparatus  1  including the substrate support  111  configured as such will be described below. As plasma processing, for example, etching processing or film-forming processing is performed. 
     First, the substrate W is loaded to the inside of the plasma processing chamber  10 , and the substrate W is mounted on the electrostatic chuck  122 . Thereafter, by applying the DC voltage to the chucking electrode  142  of the electrostatic chuck  122 , the substrate W is electrostatically adsorbed and held on the electrostatic chuck  122  by Coulomb force. 
     Next, a partial area or an entire area of the substrate W is adjusted to a desired temperature by at least one heater electrode (any one or all heater electrodes) of the plurality of heater electrodes  132  of the first ceramic layer  126 . Further, in adjusting the temperature, the temperature of the partial area or the entire area of the substrate W may be adjusted to the high-temperature range. Further, after the substrate W is loaded, the inside of the plasma processing chamber  10  is decompressed to a desired vacuum degree by the exhaust system  40 . 
     Next, processing gas is supplied from the gas supply portion  20  to the plasma processing space  10   s  through the shower head  13 . Further, source RF power for plasma generation is supplied to the conductive member of the substrate support portion  11  and/or the conductive member of the shower head  13  by the first RF generation portion  31   a  of the first RF power  31 . In addition, the processing gas is excited to generate the plasma. In this case, a bias RF signal for ion introduction may be supplied by the second RF generation portion  31   b.  In addition, by an action of the generated plasma, the plasma processing is performed for the substrate W. 
     The plasma processing method may be executed by controlling each component of the plasma processing apparatus  1  to execute a desired process by the controller  2 . 
     According to the plasma processing method, the substrate W is mounted on the substrate support  111  configured as above to adjust the temperature of the partial area or the entire area of the substrate W and the plasma processing may be performed while the electrostatic adsorption is maintained even in the high-temperature range. Therefore, the plasma processing of the substrate W in the high-temperature range may be performed with high precision, and in particular, plasma processing of a film of the substrate W including metal may be performed with high precision. 
     It should be considered that the disclosed exemplary embodiment as an example is not limited in all points. Further, the exemplary embodiment may be omitted, substituted, and changed as various forms without departing from the appended claims, a configuration example which belongs to a technical scope of the present disclosure to be described below, and the spirit. 
     For example, a material and a manufacturing method of the substrate support  111  are not limited to the exemplary embodiment. That is, the first ceramic layer  126  is manufactured by the green sheet method by using alumina as the first ceramic, but the material and the manufacturing method may be substituted and changed to a known material and a known manufacturing method, which are capable of including the plurality of heater electrodes  132  and the multi-layered electrical wiring  134  connected to the plurality of heater electrodes  132  therein. Further, the second ceramic layer  128  is manufactured by the hot press method by using high-purity alumina as the second ceramic, but the material and the manufacturing method may be substituted and changed to a known material and a known manufacturing method, which are capable of including the chucking electrodes  142  and the wiring connected to the chucking electrodes  142  therein and capable of having the high volume resistance enabling maintaining the electrostatic adsorption in the high-temperature range. Further, in the cases, when the first ceramic layer  126  and the second ceramic layer  128  are manufactured, a combination in which the difference in thermal expansion between the first ceramic layer  126  and the second ceramic layer  128  becomes 5 ppm or less is preferable. When the difference in thermal expansion between the first ceramic layer  126  and the second ceramic layer  128  is 5 ppm or less, even in a case where the first ceramic layer  126  and the second ceramic layer  128  are heated or cooled, and thereby deformed, the warpage or the like between the first ceramic layer  126  and the second ceramic layer  128  may be suppressed at least in a temperature range of the room temperature to 400° C. since the first ceramic layer  126  and the second ceramic layer  128  are deformed by an expansion rate or a shrinkage rate at the same degree. As a result, the first ceramic and the second ceramic may adopt ceramics using the same ceramic as the main ingredient. 
     Further, the second ceramic layer  128  may have a volume resistance of 1×10 16 Ω or more at an operating environment temperature (e.g., the room temperature or more and a temperature of 350° C. or less) in order to exhibit an effect of the maintaining the electrostatic adsorption in the high-temperature range. In this case, the second ceramic may adopt a ceramic having higher volume resistance than the first ceramic. Further, in the exemplary embodiment, high-purity alumina, which includes alumina of 99.95% and has a porous rate which is 0.1% or less, is used as the second ceramic but is not limited thereto. A ceramic material, which may have the volume resistance in the operating environment temperature, may be applicable. The second ceramic may adopt a ceramic which has higher purity than the first ceramic. 
     Further, in the exemplary embodiment, the inorganic adhesive is used as the adhesive layer  136  bonding the first ceramic layer  126  and the second ceramic layer  128 , but is not limited thereto. As an adhesive means applicable to the adhesive layer  136 , for example, an organic adhesive may be used. In this case, the organic adhesive preferably has at least low thermal resistance and plasma resistance so that deterioration is small even when the organic adhesive is exposed to the plasma. Further, it is possible to bond the first ceramic layer  126  and the second ceramic layer  128  by a diffusion bonding method, and in this case, the adhesive layer  136  may not be provided. 
     Further, in the plasma processing method, the temperature is adjusted to the high-temperature range, but the plasma processing may be executed even in a temperature range in which a part or the entirety of the substrate W does not reach 200° C. Further, the temperature adjustment may be a higher temperature, and specifically, the plasma processing may be performed by adjusting the temperature of the partial area or the entire area of the substrate W becomes 300° C. or more. 
     Further, for example, a constitution requirement of the exemplary embodiment may be an arbitrary combination. In the arbitrary combination, an action and an effect for each constitution requirement according to the combination are naturally obtained, and another action and another effect which are apparent to those skilled in the art are obtained from the disclosure of the present specification. 
     Further, the effect disclosed in the present specification is descriptive or exemplary anywhere, and is not limited. That is, the technology according to the present disclosure has the effect or another effect which is apparent those skilled in the art from the disclosure of the present specification instead of the effect. 
     For example, the present disclosure includes the following exemplary embodiment. 
     (Additional Statement 1) 
     A substrate support, comprising: 
     a base; 
     a first ceramic layer on the base; and 
     a second ceramic layer above the first ceramic layer, 
     wherein the first ceramic layer has 
     a first base portion made of a first ceramic, and 
     a plurality of heater electrodes included in the first base portion and for adjusting a temperature of the substrate, and 
     wherein the second ceramic layer has 
     a second base portion made of a second ceramic different from the first ceramic, and 
     a chucking electrode included in the second base portion and for holding the substrate. 
     (Additional Statement 2) 
     The substrate support of additional statement 1, wherein the first base portion includes a plurality of areas, and 
     at least one of the plurality of heater electrodes are arranged in each of the plurality of areas. 
     (Additional Statement 3) 
     The substrate support of additional statement 1 or 2, wherein the first ceramic layer includes a plurality of multi-layered electrical wirings included in the first base portion and connected to the plurality of heater electrodes, respectively. 
     (Additional Statement 4) 
     The substrate support of any one of additional statements 1 to 3, wherein the first base portion is a multi-layered structure in which a plurality of ceramic layers are stacked, and 
     at least one heater electrode is disposed between respective layers of the plurality of ceramic layers. 
     (Additional Statement 5) 
     The substrate support of additional statement 4, wherein the plurality of ceramic layers is a sintered body of a plurality of green sheets. 
     (Additional Statement 6) 
     The substrate support of any one of additional statements 1 to 5, wherein the second base portion is a sintered body of the second ceramic. 
     (Additional Statement 7) 
     The substrate support of any one of additional statements 1 to 6, wherein the second ceramic has higher volume resistance than the first ceramic. 
     (Additional Statement 8) 
     The substrate support of any one of additional statements 1 to 7, comprising an adhesive layer including an inorganic adhesive and disposed between the first ceramic layer and the second ceramic layer. 
     (Additional Statement 9) 
     The substrate support of any one of additional statements 1 to 8, wherein the first ceramic and the second ceramic have the same ceramic as a main ingredient. 
     (Additional statement 10) 
     The substrate support of any one of additional statements 1 to 9, wherein the second ceramic has higher purity than the first ceramic. 
     (Additional Statement 11) 
     The substrate support of any one of additional statements 1 to 10, wherein the second base portion has volume resistance of 1×10 16 Ω or more at a room temperature or more and 350° C. or less. 
     (Additional statement 12) 
     The substrate support of any one of additional statements 1 to 11, wherein the second ceramic includes alumina at a mass percentage concentration of 99.95% or more. 
     (Additional Statement 13) 
     The substrate support of any one of additional statements 1 to 12, wherein a dielectric constant of the second ceramic is 10 to 11. 
     (Additional statement 14) 
     The substrate support of any one of additional statements 1 to 13, wherein a difference in thermal expansion coefficients between the first base portion and the second base portion is 5 ppm or less. 
     (Additional Statement 15) 
     The substrate support of any one of additional statements 1 to 14, wherein the second ceramic has a porous rate of 0.1% or less. 
     (Additional Statement 16) 
     A plasma processing apparatus processing a substrate, comprising: 
     a chamber; and 
     a substrate support inside the chamber, 
     wherein the substrate support has 
     a base, 
     a first ceramic layer on the base, and 
     a second ceramic layer above the first ceramic layer, 
     wherein the first ceramic layer has 
     a first base portion made of a first ceramic, and 
     a plurality of heater electrodes included in the first base portion and for adjusting a temperature of the substrate, and 
     wherein the second ceramic layer has 
     a second base portion made of a second ceramic different from the first ceramic, and 
     a chucking electrode included in the second base portion and for holding the substrate. 
     (Additional Statement 17) 
     The plasma processing apparatus of additional statement 16, wherein the first base portion includes a plurality of areas, and 
     at least one of the plurality of heater electrodes are arranged in each of the plurality of areas. 
     (Additional Statement 18) 
     The plasma processing apparatus of additional statement 16 or 17, wherein the first ceramic layer includes a plurality of multi-layered electrical wirings included in the first base portion and connected to the plurality of heater electrodes, respectively. 
     (Additional Statement 19) 
     The plasma processing apparatus of additional statement 18, comprising at least one power supply connected to the plurality of heater electrodes through the plurality of multi-layered electrical wirings, 
     wherein each of the plurality of heater electrodes is configured to perform temperature control independently. 
     (Additional statement 20) 
     A plasma processing method processing a substrate using a plasma processing apparatus, wherein the plasma processing apparatus includes 
     a chamber, and 
     a substrate support disposed inside the chamber, 
     the substrate support has
         a base,   a first ceramic layer on the base, and   a second ceramic layer above the first ceramic layer,       

     the first ceramic layer has
         a first base portion made of a first ceramic, and   a plurality of heater electrodes included in the first base portion and for adjusting a temperature of the substrate, and       

     the second ceramic layer has
         a second base portion made of a second ceramic different from the first ceramic, and   a chucking electrode included in the second base portion and for holding the substrate,       

     wherein the plasma processing method includes: 
     disposing the substrate on a substrate support surface of the substrate support; 
     chucking the substrate on the substrate support surface by using the chucking electrode; 
     heating the second ceramic layer and the substrate by using at least one of the plurality of heater electrodes to adjust a temperature of a partial area or an entire area of the substrate to 300° C. or more; and 
     plasma-processing the partial area or the entire area of the substrate of which the temperature is adjusted.