Patent Publication Number: US-2015075748-A1

Title: Substrate Temperature Regulating Device and Substrate Processing Apparatus Using the Same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of Japanese Patent Application No. 2013-190969, filed on Sep. 13, 2013, in the Japan Patent Office, the disclosure of which is incorporated herein in its entirety by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a substrate temperature regulating device capable of regulating a temperature of a substrate at different temperature settings, and a substrate processing apparatus using the same. 
     BACKGROUND 
     A substrate such as a semiconductor wafer or the like is sometimes processed through a plurality of steps having different temperatures. For example, there is a known process of performing etching at a low temperature and then removing the etching residue at a high temperature and a process of heating a film formed on a substrate and then rapidly cooling the film. 
     If a process is performed that undergoes two different of temperature settings in the same chamber, throughput is reduced because time is consumed in changing the temperature setting for the chamber. For that reason, it is typical to use separate chambers that are set at different temperatures. 
     When separate chambers are used in this way, the footprint of an apparatus becomes larger and the cost is increased. 
     Under such circumstances, there have been studies for processing apparatus designs capable of increasing and decreasing the temperature within a short period of time and capable of implementing a high temperature step and a low temperature step in the same chamber. For example, one type of heating/cooling device includes a substrate support stand installed within a chamber that has a cooling function, and a halogen lamp installed in an upper region of the chamber and a quartz window installed in a top portion of the chamber. When heating the substrate, the substrate is raised upward to a heating position away from the substrate support stand. When cooling the substrate, the substrate is kept in a cooling position on the substrate support stand. 
     Because the heating mechanism takes up room in the top portion of the chamber, it is difficult to install a shower head, e.g., for introducing gas into the chamber, or a plasma source in the top portion of the chamber. Thus, there is less flexibility in the substrate processing. 
     SUMMARY 
     Some embodiments of the present disclosure provide a substrate temperature regulating device capable of rapidly changing the temperature of a substrate within the chamber of a substrate processing apparatus while allowing a wide variety of substrate processes within the chamber, and a substrate processing apparatus using such as device. 
     According to one embodiment of the present disclosure, provided is a substrate temperature regulating device for regulating a temperature of a substrate within a chamber of a substrate processing apparatus, the device including: a mounting stand configured to mount the substrate thereon, the mounting stand including a temperature regulating medium flow path formed therein; a substrate elevating mechanism configured to move the substrate up and down between a first position defined on the mounting stand and a second position defined above the mounting stand; a first temperature regulating unit configured to supply a temperature regulating medium to the temperature regulating medium flow path and configured to regulate the temperature of the substrate to a first temperature in the first position; a second temperature regulating unit installed below the mounting stand and configured to regulate the substrate to a second temperature by emitting light toward the substrate positioned in the second position and heating the substrate, the light having a wavelength that is absorbed by the substrate; and a light transmitting window installed in the mounting stand and configured to transmit the light emitted from the second temperature regulating unit. 
     According to another embodiment of the present disclosure, provided is a substrate processing apparatus for processing a substrate at different temperature settings, which includes: a chamber configured to accommodate the substrate; and the aforementioned substrate temperature regulating device installed in a bottom portion of the chamber, wherein the substrate temperature regulating device is configured to regulate a temperature of the substrate at a first temperature during a first process and to a second temperature during a second process. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure. 
         FIG. 1  is a schematic configuration of a sectional view showing a substrate temperature regulating device, according to some embodiments. 
         FIG. 2  is an enlarged sectional view showing a cooling/heating unit employed in the substrate temperature regulating device shown in  FIG. 1 . 
         FIG. 3  is an enlarged perspective view of the substrate temperature regulating device shown in  FIG. 1 . 
         FIGS. 4A to 4C  are schematic diagrams illustrating different temperature settings of the substrate temperature regulating device, according to some embodiments. 
         FIG. 5  is a sectional view showing a substrate processing apparatus including the substrate temperature regulating device of  FIG. 1 , according to some embodiments. 
         FIG. 6  is a sectional view showing a substrate processing apparatus including the substrate temperature regulating device of  FIG. 1 , according to some other embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to various embodiments, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. However, it will be apparent to one of ordinary skill in the art that the present disclosure may be practiced without these specific details. In other instances, well-known methods, procedures, systems, and components have not been described in detail so as not to unnecessarily obscure aspects of the various embodiments. 
     &lt;Configuration of the Substrate Temperature Regulating Device&gt; 
       FIG. 1  is a schematic configuration of a sectional view of a substrate temperature regulating device according to some embodiments.  FIG. 2  is an enlarged sectional view showing a cooling/heating unit employed in the substrate temperature regulating device shown in  FIG. 1 .  FIG. 3  is an enlarged perspective view of the substrate temperature regulating device shown in  FIG. 1 . 
     A substrate temperature regulating device  100  according to an embodiment is installed in the bottom portion of the chamber of a substrate processing apparatus. The substrate temperature regulating device  100  may be configured to regulate a temperature of a substrate at different temperature settings. The substrate processing apparatus performs a first process at a first temperature of the temperature settings and a second process at a second temperature setting higher than the first temperature. The substrate processing apparatus is not particularly limited to any substrate processes. For example, etching may be the first process and then residue removal may be the second process. Likewise, the substrate itself is not particularly limited. Any kind of substrate may be involved, for example, such as a semiconductor substrate (semiconductor wafer), a flat panel display (FPD) substrate or a solar cell substrate. 
     The substrate temperature regulating device  100  includes a mounting stand  10  where a substrate S can be mounted, and a substrate elevating unit  20  configured to move the substrate S up and down between a first position where the substrate S can be in contact with the mounting stand  10  and a higher second position that is above the mounting stand  10 . The substrate temperature regulating device  100  also includes a heating unit  30  installed below the mounting stand  10  and configured to heat the substrate S with light, a cooling unit  40  configured to cool the substrate S with coolant flowing through the mounting stand  10 , and a plurality of light transmitting windows  50  configured to transmit the light emitted from the heating unit  30  to the substrate S. The mounting stand  10  is supported at the bottom portion of a chamber by a cylinder-shaped support member  60 . 
     The mounting stand  10  may be a two-layer structure consisting of an upper plate  11  having a substrate mounting surface and a lower plate  12  arranged below the upper plate  11 . The upper plate  11  is made of a metallic material with high heat conductivity, e.g., aluminum The lower plate  12  may be made of a material such as stainless steel. Within the mounting stand  10  there is a coolant flow path  41  and also transmission holes  51 . The transmission holes  51  are placed where the light transmitting windows  50  are to be installed. 
     The substrate elevating unit  20  includes three support pins  21  (only two of which are shown in  FIG. 1 ) inserted into holes  13  in the mounting stand  10 . The support pins  21  are configured to support the substrate S. The substrate elevating unit  20  also includes a support plate  22  that supports the three support pins  21 , and a drive mechanism  23  configured to move the support pins  21  up and down using the support plate  22 . If the support pins  21  are retracted into the mounting stand  10  by the drive mechanism  23 , the substrate S is positioned in the first position where it is in contact with the mounting stand  10 . If the support pins  21  are caused to protrude out by the drive mechanism  23 , the substrate S is pushed by the pins to the second position where the substrate S is no longer in contact with the mounting stand  10 . The support pins  21  are also used to unload the substrate S from the apparatus. The number of the support pins  21  is not limited to three and can vary depending on the size of the substrate S. 
     The heating unit  30  is designed to heat the substrate S with the light emitted from a light emitting element such as an LED (Light Emitting Diode). The heating unit  30  may include a plurality of LED arrays  31  each equipped with a plurality of LEDs, a cooling plate  32  configured to support the LED arrays  31  and to cool the LEDs, and one or more power supply units  33  configured to supply electric power to the respective LED arrays  31 . Instead of the LEDs, other light emitting elements such as semiconductor lasers may be used. When using a light emitting element as a heating mechanism, electromagnetic radiation (in LEDs, this is induced by the recombination of electrons and holes) is used in place of black-body radiation from a heat source. For that reason, it is possible to heat only the material that absorbs the specific wavelength of the emitted light. Moreover, when heating the substrate S in this manner, the temperature can rise and fall quickly. LEDs can emit light with wavelengths that fall within a range from ultraviolet to a near infrared (0.36 μm to 1.0 μm). LEDs may include a compound semiconductor that is based on GaN, GaAs, GaP or the like. An LED suitable for the heating unit  30  would emit light of a wavelength from within the range noted above that is not transmitted by the substrate S. From this viewpoint, it is preferable to use an LED that emits near infrared light having a wavelength of 0.8 μm to 1.0 μm. Particularly, if the substrate S is made of silicon, it is possible to efficiently heat the substrate S using the near infrared light. 
     The LED arrays  31  are each aligned with the light transmitting windows  50  of the mounting stand  10 . The light emitted from the LED arrays  31  is transmitted through the light transmitting windows  50  and is irradiated on the substrate S in the second position, thereby heating the substrate S to the higher second temperature setting. The higher second temperature may be, for example, about 200 degrees C. 
     In each of the LED arrays  31 , a plurality of LEDs is installed on a support body made of a material with high-heat-conductivity while also having electrical insulation properties, for example, aluminum nitride (AlN) ceramics. The support body makes contact with the cooling plate  32  through a bonding material with high heat conductivity. The cooling plate  32  is made of a metallic material having high heat conductivity, e.g., copper or aluminum A coolant flow path  34  is defined within the cooling plate  32 . A coolant supply pipe  35  and a coolant discharge pipe  36  are connected to the coolant flow path  34 . The cooling plate  32  is cooled by circulating a coolant composed of water or a fluorine-based liquid (trade names: FLUORINERT or GALDEN) through the coolant flow path  34  by a coolant circulating mechanism (not shown). The cooling plate  32  thus cools the support body, which in turn cools the LEDs in the LED arrays  31 . Cooling the LEDs prevents the reduction in light emission that can occur when the temperature of the LEDs themselves get too hot. 
     A heat insulating plate  38  made of a resin, such as PTFE, is installed between the cooling plate  32  and the mounting stand  10 . The heat insulating plate  38  is tightly sealed between the cooling plate  32  and the mounting stand  10 . Holes  38   a  are placed on the heat insulating plate  38  so that the LED arrays  31  are not covered. 
     The cooling unit  40  includes a coolant supply pipe  42  and a coolant discharge pipe  43  connected to the coolant flow path  41  built into the mounting stand  10 . A coolant circulating mechanism  44  is configured to supply a coolant to the coolant flow path  41  through the coolant supply pipe  42  and the coolant discharge pipe  43 . It is preferable to use coolants that are transparent to the light emitted by the LEDs such as fluorine-based liquids (trade names: FLUORINERT or GALDEN) or water. By circulating the coolant in the coolant flow path  41  within the mounting stand  10 , the mounting stand  10  is maintained at the lower first temperature setting, e.g., about 25 degrees C. When the substrate S in the first position where it is in contact with the mounting stand  10 , it can be maintained at that temperature. 
     The light transmitting windows  50  in the mounting stand  10  are aligned with the LED arrays  31 . Each of the light transmitting windows  50  includes a transmission hole  51  extending completely through the mounting stand  10 , and a first light transmitting member  52  and a second light transmitting member  53  fitted into the transmission hole  51 . The transmission hole  51  is composed of an upper hole  51   a  formed in the upper plate  11  and a lower hole  51   b  formed in the lower plate  12 . The first light transmitting member  52  is fitted to the upper portion of the upper hole  51   a  such that the front surface thereof becomes flush with the front surface of the upper plate  11 . The second light transmitting member  53  is fitted in the lower hole  51   b.  A space  54  is formed between the first light transmitting member  52  and the second light transmitting member  53  in the transmission hole  51 . The space  54  serves as part of the coolant flow path  41 . The coolant passing through the coolant flow path  41  cools the substrate S through the first light transmitting member  52  in the space  54 . The coolant also cools the substrate S through the upper plate  11 . 
     In order to accurately control the temperature of the substrate S by maintaining the temperature of the front surface of the first light transmitting member  52  and the front surface of the upper plate  11  close to the coolant temperature, it is preferred that the first light transmitting member  52  and the upper plate  11  are made of a material having high heat conductivity. For that purpose, sapphire, which is transparent over a wide range of light from the visible region to the infrared region and also has a heat conductivity of 42 W/m·K, is suitable for the first light transmitting member  52 . As mentioned above, aluminum is suitable for the upper plate  11 . 
     In some embodiments, to insulate the coolant flowing within the coolant flow path  41  (including the space  54 ) from the heating unit  30  arranged below the mounting stand  10 , the second light transmitting member  53  and the lower plate  12  may be made of material with relatively low heat conductivity. Quartz, which like sapphire is transparent over a wide range of visible and infrared light, but at the same time has a lower heat conductivity of 1.4 W/m·K may be suitable as the second light transmitting member  53 . As set forth above, stainless steel can be properly used as the lower plate  12 . The use of quartz as the second light transmitting member  53  is advantageous in terms of cost. 
     As shown in  FIG. 2  on an enlarged scale, the first light transmitting member  52  has a taper  52   a  with a smaller diameter at a top side than the bottom. The upper hole  51   a  has a circumferential surface  51   c  corresponding in shape to the taper  52   a.  A seal ring  55  is fitted to the circumferential surface  51   c  such that a gap between the upper plate  11  and the first light transmitting member  52  is air-tightly sealed. The first light transmitting member  52  fitted to the upper hole  51   a  is held in place by a stopper  56 . The lower hole  51   b  has an ring-shaped shoulder portion  59 . The second light transmitting member  53  is held in place within the lower hole  51   b  by the shoulder portion  59 . The second light transmitting member  53  has a ring-shaped cutout portion  53   a  in its upper surface. A seal ring  58  is fitted to the cutout portion  53   a.  A pressing member  57  securing the seal ring  58  is screwed to the lower plate  12  near the upper region of the lower hole  51   b.  Thus, the gap between the lower plate  12  and the second light transmitting member  53  is air-tightly sealed. 
     In the substrate temperature regulating device  100 , as shown in  FIG. 3 , in some embodiments, seven LED arrays  31  of the heating unit  30  may be installed in a hexagonal shape. Six LED arrays  31  form a circle on the cooling plate  32  and one LED array  31  is arranged at the center of the cooling plate  32 . The seven upper holes  51   a  and lower holes  51   b  in the upper plate  11  and the lower plate  12  of the mounting stand  10  are aligned with the LED arrays  31 . During assembly, the first light transmitting members  52  are fitted to the upper holes  51   a  of the upper plate  11  from below. The second light transmitting members  53  are fitted to the lower holes  51   b  of the lower plate  12  from above. The upper plate  11  and the lower plate  12  are then coupled together to form the mounting stand  10 . Seven light transmitting windows  50  are formed in the mounting stand  10 . The heat insulating plate  38  is attached to the lower side of the mounting stand  10  and then the heating unit  30  is attached. 
     &lt;Operation of the Substrate Temperature Regulating Device&gt; 
     Next, the operation of the substrate temperature regulating device  100  of  FIG. 1  will be described with reference to  FIG. 4 . 
     A process may require the temperature of the substrate S to be set to a low first temperature setting (e.g., 25 degrees C.). When the substrate is placed in the process chamber, the support pins  21  of the substrate elevating unit  20  are raised to receive the substrate S from a transfer device (not shown). Then, the support pins  21  are lowered to place the substrate S on the mounting stand  10  in the first position as shown in  FIG. 4A . At this time, the temperature of the mounting stand  10  is set to the first temperature by the cooling unit  40 . A coolant is continuously circulated through the coolant flow path  41  defined within the mounting stand  10 , and the temperature of the substrate S is set to the first temperature setting through the first light transmitting members  52  of the light transmitting windows  50  and the upper plate  11 . 
     After the first process is finished at the first temperature setting, as shown in  FIG. 4B , the support pins  21  raise the substrate S to the second position above the mounting stand  10 . Electric power is supplied from the power supply units  33  of the heating unit  30  to the LEDs of the LED arrays  31 , lighting the LED. The LEDs emit near infrared light with a wavelength of 0.8 μm to 1.0 μm, which is transmitted through the first light transmitting members  52  and the second light transmitting members  53  of the light transmitting windows  50 . The infrared light is absorbed by the substrate S and the substrate S is rapidly heated. The temperature of the substrate S quickly reaches the second temperature setting, e.g., 200 degrees C. A second process is performed at the second temperature setting. Coolant continues to flow through the coolant flow path  41  of the mounting stand  10  including the spaces  54  defined within the light transmitting windows  50 . Although the coolant is irradiated with light emitted from the LEDs when it flows through the spaces  54 , its temperature will not change if it is transparent to the light. A fluorine-based liquid (such as the trade names FLUORINERT or GALDEN) or water is suitable as the coolant. 
     After the second process is performed on the substrate S at the second temperature, as shown in  FIG. 4C , the power supply units  33  that supply electric power to the LEDs are turned off so that the substrate S is no longer heated. The support pins  21  are lowered to position the substrate S on the mounting stand  10  in the first position, and the temperature of the substrate S is lowered to the first temperature setting. Next, the substrate S is carried out of the process chamber by a transfer mechanism not shown. Because the substrate S is heated by electromagnetic radiation, the substrate cools rapidly when electric power to the LEDs is cut off. When the substrate S is placed on the mounting stand  10 , the temperature of the substrate S is quickly set back to the first temperature setting. 
     In some embodiments, when the temperature of the substrate S must be set to a relatively low first temperature setting, the substrate S is placed in the first position on top of the mounting stand  10 . Coolant circulating through the mounting stand  10  cools the substrate S. When the temperature of the substrate S must be set at a relatively high second temperature setting, the substrate S is raised to the second position where it is no longer in contact with the mounting stand  10 . Without thermally affecting the mounting stand  10 , only the substrate S is heated by electromagnetic radiation from the light of the LEDs. Thus, temperature regulation can be performed in such a way that the cooling unit  40  and the heating unit  30  do not thermally affect each other. Accordingly, the temperature of the substrate S can quickly change between the first and second temperature settings. This makes it possible to increase process throughput. 
     In addition, the cooling unit  40  and the heating unit  30  are both installed on the same side of the substrate S as the mounting stand  10 . Thus, if the substrate temperature regulating device  100  is installed in a chamber of a substrate processing apparatus, none of its components use the top portion of the chamber. Other components for substrate processing, such as a shower head for introducing gas or a plasma source, can be installed in the top portion of the chamber. It is possible to flexibly perform substrate processing within the chamber. 
     &lt;Examples of Substrate Processing Apparatus using the Substrate Temperature Regulating Device&gt; 
     Next, various embodiments of substrate processing apparatuses that utilize the substrate temperature regulating device according to the present disclosure will be described. 
     EXAMPLE 1 
     Example 1 is a substrate processing apparatus that performs non-plasma etching and then heats the substrate S to remove residue. 
       FIG. 5  is a sectional view showing a substrate processing apparatus  200  including the substrate temperature regulating device  100  of  FIG. 1 , according to some embodiments. The substrate processing apparatus  200  includes a chamber  110  capable of being vacuum evacuated and the aforementioned substrate temperature regulating device  100  at the bottom portion of the chamber  110 . The substrate processing apparatus  200  further includes an exhaust unit  120  installed in the bottom portion of the chamber  110 , a shower head  130  installed in a top portion of the chamber  110 , and a process gas supply system  140  configured to supply a process gas to the shower head  130 . A loading/unloading gate  111  for loading and unloading substrates S is installed in the side of the chamber  110 . The loading/unloading gate  111  is opened and closed by a gate valve  112 . The support member  60  for the substrate temperature regulating device  100  is attached to the bottom of the chamber  110  by a seal ring  61 . 
     The exhaust unit  120  includes an exhaust pipe  121  connected to the bottom of the chamber  110 , a pressure control valve (APC)  122  installed in the exhaust pipe  121  and a vacuum pump  123  configured to evacuate the inside of the chamber  110  via the exhaust pipe  121 . 
     The shower head  130  is attached to the ceiling of the chamber  110 . The shower head  130  includes a gas introduction hole  131  in the top portion, a gas diffusion space  132 , and a plurality of gas spray holes  133  formed on its bottom surface. 
     The process gas supply system  140  is configured to supply an etching gas and an inert gas. The etching gas is used in non-plasma etching of film formed on substrate S by a previous process. The inert gas is used when thermally removing residue from substrate S and to purge the chamber  110 . Gas flows from the gas introduction hole  131  into the shower head  130  through a pipe  141 . Examples of etching gasses include HF gas, F 2  gas and NH 3  gas. Examples of the inert gasses include N 2  gas and Ar gas. 
     In the substrate processing apparatus  200 , the gate valve  112  is opened and the substrate S is loaded into the chamber  110  through the loading/unloading gate  111  by a transfer device (not shown). The substrate S (which has a film on its surface) is mounted on the mounting stand  10  (in the first position) of the substrate temperature regulating device  100 . The internal pressure of the chamber  110  is adjusted to a predetermined vacuum level by the exhaust unit  120 . The temperature of the substrate S mounted on the mounting stand  10  is set to the first temperature setting, e.g., 25 degrees C., by the coolant circulating through the cooling unit  40 . 
     An etching gas is supplied from the process gas supply system  140  to the shower head  130  and introduced into the chamber  110  through the shower head  130 . The film on the substrate S is etched. 
     After the etching is finished, an inert gas is introduced through the shower head  130  to purge the chamber  110 . The inside of the chamber  110  is converted to an inert gas atmosphere by continuously introducing the inert gas. The substrate S is raised by the support pins  21  of the substrate elevating unit  20  to the second position. The LED arrays  31  irradiate the substrate S with light, thereby heating the substrate S to the second temperature setting, e.g., 200 degrees C., and this removes residue from the etching process. 
     After the residue removal is finished, the substrate S is lowered onto the mounting stand  10  (the first position) and cooled. The gate valve  112  is opened and the cooled substrate S is unloaded through the loading/unloading gate  111  by the transfer device. 
     The substrate temperature regulating device  100  can switch between temperature settings for non-plasma etching and residue removal quickly. This makes it possible to increase process throughput. The substrate temperature regulating device  100  fits in the bottom of the chamber  110  and none of its components take up room in the top of the chamber  110 . Thus, the shower head  130  can be installed in the top portion of the chamber  110 , and this makes it possible to uniformly supply a process gas. 
     EXAMPLE 2 
     Example 2 describes a substrate processing apparatus in which plasma for ashing is generated after non-plasma etching. 
       FIG. 6  is the sectional view of such a substrate processing apparatus  300  including the substrate temperature regulating device  100  of  FIG. 1 , according to some other embodiments. The substrate processing apparatus  300  is identical in its basic configuration with substrate processing apparatus  200 . Identical parts will be designated by the same reference symbols with simplified descriptions. 
     In this example, a plurality of microwave irradiation mechanisms  210  is installed in the top of the chamber  110  as a plasma source instead of a shower head. A ring-shaped gas introduction unit  220  is installed in the upper portion of the sidewall of the chamber  110 . Process gases are introduced from the process gas supply system  140  into the chamber  110  through the gas introduction unit  220 . Substrate processing apparatus  300  differs from the substrate processing apparatus  200  shown in  FIG. 5  on these points. 
     Each of the microwave irradiation mechanisms  210  includes a tubular axial waveguide, a planar antenna, and a tuner. The waveguide is configured to propagate microwaves generated from a microwave generator not shown here. The planar antenna is installed at the tip of the waveguide. The tuner can move the waveguide. Microwaves are irradiated from a dielectric window at the tip of the planar antenna. This generates microwave plasma within the chamber. 
     In the substrate processing apparatus  300 , the substrate S is mounted on the substrate temperature regulating device  100  as in substrate processing apparatus  200 . The temperature of the substrate S is set to the first temperature setting, e.g., 25 degrees C. Etching gas is introduced from the process gas supply system  140  into the chamber  110  through the gas introduction unit  220  and film on the substrate S is etched. 
     Next, the chamber  110  is purged. The substrate S is raised to the second position. The LED arrays  31  of the heating unit  30  are turned on and the substrate S is heated to the second temperature setting, e.g., 200 degrees C., with light. While a plasma gas, such as Ar gas, is introduced from the process gas supply system  140  into the chamber  110  through the gas introduction unit  220 , the microwave irradiation mechanisms  210  irradiate the chamber  110 , generating microwave plasma within the chamber  110 . Photoresist and etching residue on the substrate S are removed by this ashing process. 
     After the ashing is finished, the irradiation of microwaves is stopped. The substrate S is returned to the mounting stand  10  (the first position) and cooled. The gate valve  112  is opened and the cooled substrate S is unloaded from the loading/unloading gate  111  by a transfer device (not shown). 
     In the substrate processing apparatus  300 , the substrate temperature regulating device  100  can quickly switch between temperature settings for non-plasma etching and ashing. This increases process throughput. The substrate temperature regulating device  100  is placed in the bottom of the chamber  110  and does not take up room in the top of the chamber  110 . Thus, the microwave irradiation mechanisms  210  can be installed in the top of the chamber  110 . This makes it possible to effectively perform the ashing. Only one microwave irradiation mechanism  210  may be used. The plasma source is not limited to microwave irradiation mechanisms  210  but may include other plasma sources. 
     &lt;Other Applications&gt; 
     The present disclosure is not limited to the aforementioned embodiments and may be modified without departing from its spirit and scope. The examples for the first and second temperature settings were 25 degrees C. and 200 degrees C., respectively. The temperatures are not limited to these settings and can include other temperature settings. In one or more of the aforementioned embodiments, a coolant is used to bring the substrate S to the first temperature setting. However, if the first temperature setting is higher than room temperature, a heating medium can be used in place of the coolant. Any suitable temperature regulating medium can be used to maintain the desired first temperature setting. 
     The number of the light transmitting windows and the number of the LED arrays are not particularly limited and may be varied depending on the size of the substrate. Moreover, the configuration of the heating unit is not limited to the one of the aforementioned embodiments. It is only necessary that the heating unit can irradiate light with a wavelength capable of heating the substrate. 
     In the above examples, the top portion of the substrate processing apparatuses had either a shower head or plasma source. However, the present disclosure is not limited to these components. Other components can be installed in the top portion of the chamber for other processes. 
     In the above examples of the substrate processing apparatus, etching is performed at a relatively low first temperature setting and residue removal or ashing is performed at a relatively high second temperature setting. However, the present disclosure is not limited to these processes. It is only necessary that the one of the processes take place at a relatively low temperature and a second process at a relatively high temperature. It is also possible to perform the high temperature process before the low temperature process. 
     In the previous examples, the substrate is in contact with the surface of on the mounting stand when regulating the temperature of the substrate to the first temperature. Alternatively, the substrate may be held near the mounting stand where it is not in direct contact with the surface. 
     In the present disclosure, when the substrate temperature is set at the relatively lower first setting, the substrate is placed on the first position on the mounting stand. A temperature regulating medium is circulated through a flow path within the mounting stand by the first temperature regulating unit. The temperature of the substrate is regulated by heat transfer. When the substrate temperature is set to the higher second setting, the substrate is raised to a second position, away from the mounting stand. Light with a wavelength that can be absorbed by the substrate is emitted from the second temperature regulating unit. The second temperature regulating unit is located below the mounting stand, and the light is shone onto the substrate through light transmitting windows installed in the mounting stand. The substrate is heated with light to the second temperature setting. Thus, the first and second temperature regulating units can each set the substrate temperature to their desired settings without thermally affecting each other. The substrate temperature can be changed quickly within the same chamber. This improves process throughput. In addition, the first and second temperature regulating units are both installed in the vicinity of the mounting stand. Thus, if the substrate temperature regulating device is installed in the chamber of a substrate processing apparatus, it is possible to freely use the top of the chamber for substrate processing. This increases the flexibility of substrate processing within the chamber. 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the present disclosure. Indeed, the embodiments described herein may be embodied in a variety of other forms. Furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the present disclosure. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the present disclosure.