Patent Publication Number: US-2022213596-A1

Title: Substrate processing method and substrate processing device

Description:
TECHNICAL FIELD 
     The present disclosure relates to a substrate processing method and a substrate processing device for processing a process on a target substrate. 
     BACKGROUND 
     Semiconductor devices are manufactured by repeatedly performing various processes such as an etching process, a film-forming process and the like, on a semiconductor wafer (hereinafter simply referred to as a wafer) which is a target substrate. 
     As an apparatus for performing such a substrate process, a single wafer type processing apparatus for processing target substrates one by one has been conventionally widely used. However, such a processing apparatus is required to increase throughput, and a processing apparatus for performing the substrate process on two or more target substrates at a time while maintaining the platform of the single wafer type processing apparatus has also been used (see, e.g., Patent Document 1). 
     In the substrate processing device disclosed in Patent Document 1, a substrate mounting table on which a plurality of target substrates is mounted is installed inside a chamber. A plurality of process regions and a plurality of separation regions that separates the plurality of process regions from each other are alternately defined above the substrate mounting table along a circumferential direction of the substrate mounting table. In the substrate process, the substrate mounting table is rotated such that the plurality of target substrates pass through the regions in the order of “process region separation region process region separation region, . . . ”. In this way, the plurality of target substrates is processed under different gas conditions. 
     PRIOR ART DOCUMENTS 
     Patent Documents 
     
         
         Patent Document 1: Japanese laid-open publication No. 2010-080924 
       
    
     In the substrate processing device disclosed in Patent Document 1, in order to process the plurality of target substrates under the different gas conditions, exhaust mechanisms are separately installed for the process regions independently of each other. This increases the manufacturing costs of the substrate processing device. 
     SUMMARY 
     The present disclosure provides some embodiments of a substrate processing method and a substrate processing device, which are capable of performing a substrate process on a plurality of target substrates under different gas conditions with high precision using a common exhaust mechanism, when processing the plurality of target substrates by a plurality of processing parts. 
     According to a first aspect of the present disclosure, there is provided a substrate processing method for performing a predetermined process on a plurality of target substrates under a vacuum atmosphere using a substrate processing device that includes a plurality of processing parts for performing a substrate process on each of the plurality of target substrates, a gas supply mechanism for separately supplying gases to the plurality of processing parts, and a common exhaust mechanism for exhausting the gases inside the plurality of processing parts in a collective manner. The method includes: performing a first mode in which a first gas is supplied to a portion of the plurality of processing parts and a second gas different from the first gas is supplied to another portion of the plurality of processing parts, while controlling the common exhaust mechanism so as to exhaust a processing gas in common from the plurality of processing parts; and subsequently, performing a second mode in which the first gas as the processing gas is supplied to all of the plurality of processing parts under the same gas conditions, while exhausting the processing gas from the plurality of processing parts in a collective manner by the common exhaust mechanism, wherein, in the first mode, a pressure difference is prevented from occurring between the plurality of processing parts. 
     In the first aspect, when performing the first mode, an amount of the second gas supplied to the another portion of the plurality of processing parts may be controlled so as to prevent the pressure difference from occurring between the portion of the plurality of processing parts and the another portion of the plurality of processing parts. 
     At least one of an inert gas and a non-reactive gas that is not reactive with the plurality of target substrates may be used as the second gas. Further, when performing the first mode, in the portion of the plurality of processing parts, the substrate process using the first gas which is the processing gas for the plurality of target substrates may be performed; and in the another portion of the plurality of processing parts, the substrate process may not be performed by supplying the second gas as a supplement gas instead of supplying the first gas which is the processing gas for the plurality of target substrates. 
     In this case, the method may further include, prior to the performing the first mode, stabilizing pressures of the plurality of processing parts by regulating the pressures of the plurality of processing parts with a pressure regulating gas. When stabilizing the pressures, a flow rate of the pressure regulating gas may be set to a level at which the first gas used as the processing gas and the second gas used as the supplement gas are suppressed from backwardly diffusing between the plurality of processing parts, and a flow of the pressure regulating gas toward the common exhaust mechanism is formed, in the first mode of the substrate process. A portion of the gases supplied during the substrate process, which is not used for the substrate process, may be used as the pressure regulating gas, and the flow rate of the pressure regulating gas in the stabilizing pressures may be set to be larger than a flow rate of the pressure regulating gas used in the substrate process. The flow rate of the pressure regulating gas in the stabilizing pressures may be set to be three times or more the flow rate of the pressure regulating gas used in the substrate process. 
     In some embodiments, a dilution gas for diluting the first gas may be used as the second gas. 
     According to a second aspect of the present disclosure, there is provided a substrate processing method for performing a predetermined process on a plurality of target substrates under a vacuum atmosphere using a substrate processing device that includes a plurality of processing parts for performing a substrate process on each of the plurality of target substrates, a gas supply mechanism for separately supplying gases to the plurality of processing parts, and a common exhaust mechanism for exhausting the gases inside the plurality of processing parts in a collective manner. The method includes: performing a first mode in which an HF gas and an NH 3  gas as processing gases are supplied to a portion of the plurality of processing parts so as to perform an etching process, and instead of the HF gas, at least one of an inert gas and a non-reactive gas which is not reactive with the plurality of target substrates is supplied to another portion of the plurality of processing parts so as not to perform the etching process, while controlling the common exhaust mechanism so as to exhaust the processing gases in common from the plurality of processing parts; and subsequently, performing a second mode in which the HF gas and the NH 3  gas as the processing gases are supplied to all of the plurality of processing parts so as to perform the etching process, while exhausting the processing gases from the plurality of processing parts in a collective manner by the common exhaust mechanism, wherein, in the first mode, the supply of the gases is performed to prevent a pressure difference from occurring between the plurality of processing parts. 
     In the second aspect, when performing the first mode, the HF gas and the NH 3  gas as the processing gases and the inert gas may be supplied to the portion of the plurality of processing parts, and supplying the inert gas or the inert gas and the NH 3  gas to the another portion of the plurality of processing parts. The inert gas may be used as a supplement gas for regulating pressures of the portion of the plurality of processing parts and the another portion of the plurality of processing parts. 
     In some embodiments, the method may further include, prior to the performing a first mode, stabilizing pressures of the plurality of processing parts by regulating the pressures of the plurality of processing parts with the inert gas or the inert gas and the NH 3  gas as pressure regulating gases. When stabilizing the pressures, flow rates of the pressure regulating gases may be set to a level at which the processing gases and the inert gas are suppressed from backwardly diffusing between the plurality of processing parts, and a flow of the pressure regulating gases toward the common exhaust mechanism is formed, in the first mode of the substrate process. The flow rates of the pressure regulating gases in the stabilizing pressures may be set to be larger than flow rates of the pressure regulating gases used in the substrate process. The flow rates of the pressure regulating gases in the stabilizing pressures may be set to be three times or more the flow rates of the pressure regulating gases used in the substrate process. 
     According to a third aspect of the present disclosure, there is provided a substrate processing device for performing a predetermined process on a plurality of target substrates under a vacuum atmosphere, including: a plurality of processing parts, each of which configured to perform a substrate process on each of the plurality of target substrates; a gas supply mechanism configured to separately supply processing gases to the plurality of processing parts; a common exhaust mechanism configured to exhaust the processing gases inside the plurality of processing parts in a collective manner; and a controller configured to control the gas supply mechanism and the common exhaust mechanism to execute the substrate process on the plurality of target substrates in a sequence of first and second modes, wherein the first mode involves supplying a first gas to a portion of the plurality of processing parts and supplying a second gas different from the first gas to another portion of the plurality of processing parts, while controlling the common exhaust mechanism so as to exhaust the processing gas in common from the plurality of processing parts, and the second mode involves supplying the first gas as the processing gases to all of the plurality of processing parts under the same gas conditions, while exhausting the processing gases from the plurality of processing parts in a collective manner by the common exhaust mechanism, wherein, in the first mode, the controller controls such that a pressure difference is prevented from occurring between the plurality of processing parts. 
     According to a fourth aspect of the present disclosure, there is provided a substrate processing device for performing a predetermined process on a plurality of target substrates under a vacuum atmosphere, including: a plurality of processing parts, each of which configured to perform a substrate process on each of the plurality of target substrates; a gas supply mechanism configured to separately supply processing gases to the plurality of processing parts; a common exhaust mechanism configured to exhaust the processing gases inside the plurality of processing parts in a collective manner; and a controller configured to control the gas supply mechanism and the common exhaust mechanism to execute the substrate process on the plurality of target substrates in a sequence of first and second modes, wherein the first mode involves supplying an HF gas and an NH 3  gas as the processing gases to a portion of the plurality of processing parts so as to perform an etching process, and instead of the HF gas, supplying at least one of an inert gas and a non-reactive gas which is not reactive with the plurality of target substrates to another portion of the plurality of processing parts so as not to perform the etching process, while controlling the common exhaust mechanism so as to exhaust the processing gases in common from the plurality of processing parts; and the second mode involves supplying the HF gas and the NH 3  gas as the processing gases to all of the plurality of processing parts so as to perform the etching process, while exhausting the processing gases from the plurality of processing parts in a collective manner by the common exhaust mechanism, wherein the controller controls in the first mode such that the supply of the gases is performed to prevent a pressure difference from occurring between the plurality of processing parts. 
     According to a fifth aspect of the present disclosure, there is provided a storage medium storing a program that operates on a computer and controls a substrate processing device that includes a plurality of processing parts for performing a substrate process on each of a plurality of target substrates, a gas supply mechanism for separately supplying gases to the plurality of processing parts, and a common exhaust mechanism for exhausting the gases inside the plurality of processing parts in a collective manner, wherein the program, when executed, causes the computer to control the substrate processing device so as to perform a substrate processing method. The method includes: performing a first mode in which a first gas is supplied to a portion of the plurality of processing parts and a second gas different from the first gas is supplied to another portion of the plurality of processing parts, while controlling the common exhaust mechanism so as to exhaust a processing gas in common from the plurality of processing parts; and subsequently, performing a second mode in which the first gas as the processing gas is supplied to all of the plurality of processing parts under the same gas conditions, while exhausting the processing gas from the plurality of processing parts in a collective manner by the common exhaust mechanism, wherein, in the first mode, a pressure difference is prevented from occurring between the plurality of processing parts. 
     According to the present disclosure, it is possible to perform a substrate process on a plurality of target substrates under different gas conditions with high precision using a common exhaust mechanism, when processing the plurality of target substrates by a plurality of processing parts. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a sectional view illustrating an example of a substrate processing device according to an embodiment of the present disclosure. 
         FIG. 2  is a system configuration view illustrating a configuration example of a gas supply mechanism. 
         FIG. 3A  is a sectional view for explaining a substrate processing operation in a common substrate processing mode by a COR processing apparatus according to an embodiment of the present disclosure. 
         FIG. 3B  is a sectional view for explaining a substrate processing operation in an independent substrate processing mode by the COR processing apparatus according to the embodiment of the present disclosure. 
         FIG. 4  is a view schematically illustrating a substrate processing mode according to a reference example. 
         FIG. 5  is a flow chart illustrating an example of a process sequence in the substrate processing device of  FIG. 1 . 
         FIG. 6  is a timing chart illustrating a specific gas flow when implementing an example of a sequence in the substrate processing device of  FIG. 1 . 
         FIG. 7  is a timing chart illustrating a specific gas flow when implementing another example of the sequence in the substrate processing device of  FIG. 1 . 
         FIG. 8  is a view for explaining the effect of the sequence of  FIG. 7 . 
         FIG. 9  is a view schematically illustrating an example of a chamber configuration of a substrate processing device. 
         FIG. 10  is a view schematically illustrating another example of the chamber configuration of the substrate processing device. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. 
     &lt;Substrate Processing Device&gt; 
       FIG. 1  is a sectional view illustrating an example of a substrate processing device according to an embodiment of the present disclosure. In this example, a COR processing apparatus which performs a chemical oxide removal (COR) process (etching process) will be described as the substrate processing device. 
     A typical example of the COR process is a substrate process of supplying a gas including an HF gas and a gas including an NH 3  gas onto an oxide film existing on a surface of a substrate such as a silicon wafer inside a chamber, thus removing the oxide film from the surface of the silicon wafer. 
     As illustrated in  FIG. 1 , a COR processing apparatus  100  includes a hermetically sealed chamber  10 . The chamber  10  is made of, for example, aluminum or an aluminum alloy, and includes a chamber main body  51  and a lid  52 . The chamber main body  51  includes a lateral wall portion  51   a  and a bottom portion  51   b . An upper portion of the chamber main body  51  is opened and closed by the lid  52 . The lateral wall portion  51   a  and the lid  52  are sealed by a seal member  51   c  to secure the airtightness of the chamber  10 . 
     Two processing parts  11   a  and  11   b  for performing a substrate process on a plurality of target substrates are installed inside the chamber  10 . The two processing parts  11   a  and  11   b  include substrate mounting tables  61   a  and  61   b , respectively. Wafers Wa and Wb as target substrates are mounted on the respective substrate mounting tables  61   a  and  61   b  in a horizontal posture. Gas introduction members  12   a  and  12   b  for introducing a processing gas into the chamber  10  are installed above the substrate mounting tables  61   a  and  61   b , respectively. The gas introduction members  12   a  and  12   b  are installed inward of the lid  52 . The gas introduction member  12   a  and the substrate placing table  61   a  face each other, and the gas introduction member  12   b  and the substrate placing table  61   b  face each other. A cylindrical inner wall  71   a  is installed so as to surround the gas introduction member  12   a  and the substrate mounting table  61   a , and a cylindrical inner wall  71   b  is installed so as to surround the gas introduction member  12   b  and the substrate mounting table  61   b . The inner walls  71   a  and  71   b  are installed to extend from the inner side of an upper wall of the lid  52  to the bottom portion  51   b  of the chamber main body  51 . Upper portions of the inner walls  71   a  and  71   b  constitute lateral walls of the gas introduction members  12   a  and  12   b , respectively. A space between the gas introduction member  12   a  and the substrate mounting table  61   a  and a space between the gas introduction member  12   b  and the substrate mounting table  61   b  are substantially sealed by the inner walls  71   a  and  71   b , respectively. These spaces constitute process spaces S in which the wafers Wa and Wb are subjected to the substrate process, respectively. 
     A gas supply mechanism  14  for supplying a gas to each of the gas introduction members  12   a  and  12   b , an exhaust mechanism  15  for exhausting the interior of the chamber  10 , and a control part  16  for controlling the COR processing apparatus  100  are installed outside the chamber  10 . A loading/unloading port (not shown) through which the wafer W is loaded into and unloaded is formed in the lateral wall portion  51   a  of the chamber main body  51 . The loading/unloading port can be opened and closed by a gate valve (not shown). A loading/unloading port (not shown) is also formed in each of the inner walls  71   a  and  72   b  and can be opened and closed by a shutter (not shown). 
     Each of the processing parts  1   a  and  11   b  has substantially a circular shape. Each of the substrate mounting tables  61   a  and  61   b  is supported by a base block  62 . The base block  62  is fixed to the bottom portion  51   b  of the chamber main body  51 . A temperature regulator  63  for regulating a temperature of the wafer W is installed inside each of the substrate mounting tables  61   a  and  61   b . The temperature regulator  63  is provided with a pipeline through which, for example, a temperature regulating medium (for example, water) circulates. By heat exchange with the temperature regulating medium flowing in the pipeline, the temperature of the wafer W is controlled. In addition, a plurality of lifting pins (not shown) used to transfer the wafer W are installed in the substrate mounting tables  61   a  and  61   b  so as to be moved upward and downward on a wafer mounting surface. 
     The gas supply mechanism  14  supplies a processing gas, such as an HF gas or an NH 3  gas, and an inert gas (dilution gas), such as an Ar gas or a N 2  gas, to the processing parts  11   a  and  11   b  via the gas introduction members  12   a  and  12   b , respectively. The gas supply mechanism  14  includes gas supply sources, supply pipes, valves, flow rate controllers represented by mass flow controllers and so on, which correspond to the respective gases. 
       FIG. 2  is a system configuration view illustrating an example of a system configuration of the gas supply mechanism  14 . As illustrated in  FIG. 2 , the gas supply mechanism  14  includes an Ar gas supply source  141 , an HF gas supply source  142 , an N 2  gas supply source  143  and an NH 3  gas supply source  144  as the gas supply sources. 
     In this example, the HF gas supplied from the HF gas supply source  142  is diluted with an Ar gas supplied from the Ar gas supply source  141  and then supplied to the gas introduction members  12   a  and  12   b . Likewise, the NH 3  gas supplied from the NH 3  gas supply source  144  is also diluted with the N 2  gas supplied from the N 2  gas supply source  143  and then supplied to the gas introduction members  12   a  and  12   b.    
     An HF gas supply pipe  145  through which the HF gas flows is branched into two HF gas supply pipes  145   a  and  145   b  which are respectively connected to a supply pipe  146   a  connected to the gas introduction member  12   a  and a supply pipe  146   b  connected to the gas introduction member  12   b . An Ar gas supply pipe  147  through which the Ar gas flows is branched into two Ar gas supply pipes  147   a  and  147   b  which are respectively connected to the HF gas supply pipes  145   a  and  145   b . Thus, the HF gas can be diluted with the Ar gas. 
     Similarly, an NH 3  gas supply pipe  148  through which the NH 3  gas flows is branched into two NH 3  gas supply pipes  148   a  and  148   b  which are respectively connected to the supply pipes  146   a  and  146   b . A N 2  gas supply pipe  149  through which the N 2  gas flows is branched into two N 2  gas supply pipes  149   a  and  149   b  which are respectively connected to the NH 3  gas supply pipes  148   a  and  148   b . Thus, the NH 3  gas can be diluted with the N 2  gas. 
     In addition to being used as dilution gases, the Ar gas and the N 2  gas are also used as a purge gas or as a supplement gas for pressure regulation to be described later. 
     Mass flow controllers (MFCs)  150   a  to  150   h  and opening/closing valves  151   a  to  151   h  for opening/closing the respective supply pipes are respectively installed in the HF gas supply pipes  145   a  and  145   b , the Ar gas supply pipes  147   a  and  147   b , the NH 3  gas supply pipes  148   a  and  148   b , and the N 2  gas supply pipes  149   a  and  149   b . The MFCs  150   a  to  150   h  and the opening/closing valves  151   a  to  151   h  can be controlled by the control part  16  independently of each other. 
     For example, in the case of performing the normal COR process in the two processing parts  11   a  and  11   b , both the HF gas and the NH 3  gas are supplied to each of the gas introduction members  12   a  and  12   b . In this case, the control part  16  controls all the opening/closing valves to be opened, as shown in the following “Case a”. 
     [Case a] 
     Supply System to Gas Introduction Member  12   a   
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 Opening/closing valve 151a (Ar) 
                 Opened 
               
               
                   
                 Opening/closing valve 151c (HF) 
                 Opened 
               
               
                   
                 Opening/closing valve 151e (N 2 ) 
                 Opened 
               
               
                   
                 Opening/closing valve 151g (NH 3 ) 
                 Opened 
               
               
                   
                   
               
            
           
         
       
     
     Supply System to Gas Introduction Member  12   b   
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 Opening/closing valve 151b (Ar) 
                 Opened 
               
               
                   
                 Opening/closing valve 151d (HF) 
                 Opened 
               
               
                   
                 Opening/closing valve 151f (N 2 ) 
                 Opened 
               
               
                   
                 Opening/closing valve 151h (NH 3 ) 
                 Opened 
               
               
                   
                   
               
            
           
         
       
     
     On the other hand, the opening/closing valves may be controlled such that conditions of gases to be supplied to the processing parts  11   a  and  11   b  via the gas introduction members  12   a  and  12   b  are different from each other. For example, the opening/closing valves may be controlled as shown in the following “Case b” and “Case c”. 
     [Case b] 
     Supply System to Gas Introduction Member  12   a   
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 Opening/closing valve 151a (Ar) 
                 Opened 
               
               
                   
                 Opening/closing valve 151c (HF) 
                 Opened 
               
               
                   
                 Opening/closing valve 151e (N 2 ) 
                 Opened 
               
               
                   
                 Opening/closing valve 151g (NH 3 ) 
                 Opened 
               
               
                   
                   
               
            
           
         
       
     
     Supply System to Gas Introduction Member  12   b   
                                                Opening/closing valve 151b (Ar)   Opened           Opening/closing valve 151d (HF)   Closed           Opening/closing valve 151f (N 2 )   Opened           Opening/closing valve 151h (NH 3 )   Closed                        
[Case c]
 
     Supply System to Gas Introduction Member  12   a   
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 Opening/closing valve 151a (Ar) 
                 Opened 
               
               
                   
                 Opening/closing valve 151c (HF) 
                 Closed 
               
               
                   
                 Opening/closing valve 151e (N 2 ) 
                 Opened 
               
               
                   
                 Opening/closing valve 151g (NH 3 ) 
                 Closed 
               
               
                   
                   
               
            
           
         
       
     
     Supply System to Gas Introduction Member  12   b   
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 Opening/closing valve 151b (Ar) 
                 Opened 
               
               
                   
                 Opening/closing valve 151d (HF) 
                 Opened 
               
               
                   
                 Opening/closing valve 151f (N 2 ) 
                 Opened 
               
               
                   
                 Opening/closing valve 151h (NH 3 ) 
                 Opened 
               
               
                   
                   
               
            
           
         
       
     
     That is to say, in Case b, from the state of Case a, the opening/closing valve  151   d  and the opening/closing valve  151   h  are closed to stop the supply of the HF gas and the NH 3  gas as processing gases and supply only the Ar gas and the Na gas to the gas introduction member  12   b , and the HF gas and the NH 3  gas as the processing gases continue to be supplied to the gas introduction member  12   a . Conversely, in Case c, the supply of the HF gas and the NH 3  gas to the gas introduction member  12   a  is stopped, and the HF gas and the NH 3  gas as the processing gases continue to be supplied to the gas introduction member  12   b.    
     For this reason, in Case b, the HF gas and the NH 3  gas are supplied from the gas introduction member  12   a  to the processing part  11   a , together with the Ar gas and the Na gas which are inert gases, respectively, while only the Ar gas and the Na gas which are inert gases are supplied from the gas introduction member  12   b  to the processing part  11   b . Conversely, in Case c, the HF gas and the NH 3  gas are supplied from the gas introduction member  12   b  to the processing part  11   b , together with the Ar gas and the Na gas which are inert gases, respectively, while only the Ar gas and the Na gas which are inert gases are supplied from the gas introduction member  12   a  to the processing part  11   a . In this manner, during processing, it is possible to simultaneously supply the gases to the processing part  11   a  and the processing part  11   b  under different gas supply conditions. Substrate processing modes by the control of the valves will be described in detail later. 
     The gas introduction members  12   a  and  12   b  are provided to introduce the gases from the gas supply mechanism  14  into the chamber  10  and supply the gases to the processing parts  11   a  and  11   b . Each of the gas introduction members  12   a  and  12   b  has a gas diffusion space  64  defined therein and has a cylindrical shape. Gas introduction holes  65  penetrating the upper wall of the chamber  10  are respectively formed in the upper surfaces of the gas introduction members  12   a  and  12   b . A large number of gas discharge holes  66  connected to each of the gas diffusion spaces  64  are respectively formed in the bottom surfaces of the gas introduction members  12   a  and  12   b . Gases such as the HF gas and the NH 3  gas supplied from the gas supply mechanism  14  reach the gas diffusion spaces  64  via the gas introduction holes  65 , diffuse inside the gas diffusion spaces  64 , and are uniformly discharged from the gas discharge holes  66  in the form of a shower. That is to say, each of the gas introduction members  12   a  and  12   b  functions as a gas dispersion head (shower head) that dispersedly discharges a gas. The gas introduction members  12   a  and  12   b  may be of a post-mix type in which the HF gas and the NH 3  gas are discharged into the chamber  10  through different flow paths. 
     The exhaust mechanism  15  includes an exhaust pipe  101  connected to an exhaust port (not shown) formed in the bottom portion  51   b  of the chamber  10 . Further, the exhaust mechanism  15  includes an automatic pressure control valve (APC)  102  for controlling an internal pressure of the chamber  10  and a vacuum pump  103  for exhausting the interior of the chamber  10 , which are installed in the exhaust pipe  101 . The exhaust port is formed outside the inner walls  71   a  and  71   b . A number of slits are formed in portions of the inner walls  71   a  and  71   b  below the substrate mounting tables  61   a  and  61   b , respectively, so that the exhaust mechanism  15  can exhaust the interior of the chamber  10  from both the processing parts  11   a  and  11   b . Thus, the interiors of the processing parts  11   a  and  11   b  are exhausted by the exhaust mechanism  15  at the same time. The APC  102  and the vacuum pump  103  are shared by both the processing parts  11   a  and  11   b.    
     In addition, in order to measure the internal pressure of the chamber  10 , a high-pressure capacitance manometer  105   a  and a low-pressure capacitance manometer  105   b , which are pressure gauges, are installed so as to be inserted into the exhaust spaces  68  from the bottom portion  51   b  of the chamber  10 , respectively. The opening degree of the automatic pressure control valve (APC)  102  is controlled based on a pressure detected by the capacitance manometer  105   a  or  105   b.    
     The control part  16  includes a process controller  161  provided with a microprocessor (computer) for controlling various components of the COR processing apparatus  100 . A user interface  162  is connected to the process controller  161 . The user interface  162  includes a keyboard or a touch panel display for allowing an operator to input commands to manage the COR processing apparatus  100 , a display for visualizing and displaying the operation status of the COR processing apparatus  100 , and the like. In addition, a storage part  163  is connected to the process controller  161 . The storage part  163  stores a control program for realizing various processes executed in the COR processing apparatus  100  under the control of the process controller  161 , processing recipes which are control programs for causing the various components of the COR processing apparatus  100  to execute their respective prescribed processes according to processing conditions, various databases and the like. The processing recipes are stored in an appropriate storage medium (not shown) in the storage part  163 . Then, as necessary, any of the processing recipes is called from the storage part  163  and is executed by the process controller  161 , so that a desired process is performed in the COR processing apparatus  100  under the control of the process controller  161 . 
     Further, in the present embodiment, the control part  16  has a significant feature in that the MFCs  150   a  to  150   h  and the opening/closing valves  151   a  to  151   h  of the gas supply mechanism  14  are independently controlled as described above. 
     &lt;Substrate Processing Operation&gt; 
     Next, a substrate processing operation performed by such a substrate processing device will be described.  FIGS. 3A and 3B  are sectional views for explaining a substrate processing operation performed by the COR processing apparatus  100  according to an embodiment. 
     Two wafers Wa and Wb on each of which an etching target film (for example, SiO 2  film) has been formed are respectively loaded into the processing parts  11   a  and  11   b  inside the chamber  10 , and are respectively mounted on the substrate mounting tables  61   a  and  61   b . Then, a pressure stabilizing step of stabilizing the internal pressure of the chamber  10  by adjusting the internal pressure to a predetermined pressure by means of the exhaust mechanism  15  is performed, and subsequently, a substrate process step is performed. Since the processing parts  11   a  and  11   b  share the exhaust mechanism  15 , the pressure adjustment during the pressure stabilizing step and the substrate process step is performed by the common automatic pressure control valve (APC)  102 . 
     The substrate process step is performed with a common substrate processing mode illustrated in  FIG. 3A  and an independent substrate processing mode illustrated in  FIG. 3B . 
     (Common Substrate Processing Mode) 
     The common substrate processing mode is a mode in which the wafers Wa and Wb are processed under the same gas conditions. With this common substrate processing mode, a COR process is performed in both the processing parts  11   a  and  11   b . In this mode, the state of the opening/closing valves  151   a  to  151   h  corresponds to “Case a” described above. Thus, as illustrated in  FIG. 3A , the HF gas and the NH 3  gas respectively diluted with the Ar gas and the N 2  gas as inert gases are supplied from the gas introduction members  12   a  and  12   b  onto the wafers Wa and Wb, whereby the same substrate process is performed on both the wafers Wa and Wb. 
     (Independent Substrate Processing Mode) 
     The independent substrate processing mode is a mode in which the wafers Wa and Wb are processed under different gas conditions. In this mode, the state of the opening/closing valves  151   a  to  151   h  corresponds to, for example, “Case b” described above. Thus, as illustrated in  FIG. 3B , the HF gas and the NH 3  gas respectively diluted with the Ar gas and the N 2  gas are supplied from the gas introduction member  12   a  onto the wafer Wa of the processing part  11   a , and only the Ar gas and the N 2  gas are supplied from the gas introduction member  12   b  onto the wafer Wb of the processing part  11   b , whereby different substrate processes are performed on the wafers Wa and Wb. That is to say, the processing of the wafer Wa by the HF gas and the NH 3  gas is continued in the processing part  11   a , whereas the supply of the HF gas and the NH 3  gas onto the wafer Wb is stopped in the processing part  11   b . At this time, only the HF gas may be stopped and the NH 3  gas may be supplied to the processing part  11   b . An inert gas supplied from the gas introduction member  12   b  may be one of the Ar gas and the N 2  gas. 
     In the independent substrate processing mode, contrary to  FIG. 3B , the processing of the wafer Wb by the HF gas and the NH 3  gas may be performed in the processing part  11   b , whereas the supply of the HF gas and the NH 3  gas onto the wafer Wa may be stopped in the processing part  11   a . In this case, the state of the opening/closing valves  151   a  to  151   h  corresponds to, for example, “Case c” described above. At this time, the supply of the HF gas to the processing part  11   a  may be stopped, and the NH 3  gas may be supplied to the processing part  11   a . An inert gas supplied from the gas introduction member  12   a  may be one of the Ar gas and the N 2  gas. 
     When it is desired to make a timing of the COR processing different between the processing part  11   a  and the processing part  11   b , the independent substrate processing mode is a mode in which processing is performed in one processing part and no processing is performed in the other processing part. 
     When the independent substrate processing mode is applied in such a manner that the COR process is performed in the processing part  11   b  and no COR process is performed in the processing part  11   b , it may be considered to stop the supply of a gas from the gas introduction member  12   b  to the processing part  11   b , as a reference example illustrated in  FIG. 4 . However, since the exhaust mechanism  15  is shared by both the processing parts  11   a  and  11   b  and the pressure is controlled by the single APC, if the supply of a gas from the gas introduction member  12   b  is stopped while continuing to supply the HF gas and the NH 3  gas from the gas introduction member  12   a , a pressure difference occurs between the processing part  11   a  and the processing part  11   b . Therefore, even when the process spaces S of the processing parts  11   a  and  11   b  are substantially sealed, the gas from the gas introduction member  12   a  flows backward through slits formed in the lower portions of the inner walls  71   a  and  71   b  and flows into the processing portion  11   b . This makes it difficult to completely stop the processing of the wafer Wb by the HF gas and the NH 3  gas in the processing part  11   b . For this reason, in the independent substrate processing mode, the Ar gas and the N 2  gas are supplied from the gas introduction member  12   b , as illustrated in  FIG. 3B . However, if the flow rates of the Ar gas and the N 2  gas are equal to those in the processing part  11   a , the total flow rate decreases, which also generates a pressure difference to cause a backward flow. This makes it difficult to stop the processing completely. Therefore, in the present embodiment, in the case where the processing is performed in the independent substrate processing mode, the gas supply mechanism  14  controls the flow rates of the Ar gas and the N 2  gas from the gas introduction member  12   b  so as to prevent a pressure difference from occurring between the processing part  11   a  and the processing part  11   b.    
     For example, the control part  16  can control the gas supply mechanism so that the pressure of the processing part  11   a  and the pressure of the processing part  11   b  become equal to each other so as to prevent the pressure difference from occurring between the processing part  11   a  and the processing part  11   b  by closing the opening/closing valves  151   d  and  151   h  to stop the supply of the HF gas and the NH 3  gas to the gas introduction member  12   b  and increasing the flow rates of the Ar gas and the N 2  gas by means of the MFCs  150   b  and  150   f  with the opening/closing valves  151   b  and  151   f  opened. That is to say, the Ar gas and the N 2  gas are used as supplement gases for pressure regulation. As described above, in the independent substrate processing mode, the NH 3  gas may be supplied to the processing part  11   b  which performs no processing, but in that case, only the Ar gas may be used as the supplement gas. 
     In this manner, for one of the processing parts  11   a  and  11   b , which is intended to stop the substrate process, the pressure regulation is performed by supplying an inert gas as a supplement gas for pressure regulation rather than simply stopping the supply of a processing gas. Thus, even when the exhaust of gases from both the processing parts  11   a  and  11   b  by the single exhaust mechanism  15  is performed at the same time, it is possible to prevent the inflow of gas between the processing parts  11   a  and  11   b.    
     (One Example of Process Sequence) 
     In this example, as illustrated in a flow chart of  FIG. 5 , after a pressure stabilizing step S 1  for stabilizing a pressure, a substrate process step (COR process) S 2  is performed in combination of the processing in the common substrate processing mode and the processing in the independent substrate processing mode, and then an exhausting step S 3  for exhausting a process space is performed. In performing the substrate process step S 2 , the independent substrate processing mode-based process S 2 - 1  is initially performed and subsequently the common substrate processing mode-based process S 2 - 2  is performed. 
     In the substrate process step S 2 , when the common substrate processing mode-based process S 2 - 2  is initially performed and the independent substrate processing mode-based process S 2 - 1  is then performed, even if a processing gas to be supplied to a processing part in which the processing is paused is switched to a supplement gas, etching (COR process) may proceed due to a reaction product and a residual gas on the wafer when the processing is paused under high pressure conditions. 
     Therefore, in this example, when performing the substrate process step S 2  followed by the pressure stabilizing step S 1 , the independent substrate processing mode-based process S 2 - 1  is first performed and subsequently the common substrate processing mode-based process S 2 - 2  is performed. Thus, it is possible to eliminate the influence of a reaction product and a residual gas, thereby improving the control accuracy of the etching amount. 
     In the transition from the independent substrate processing mode-based process S 2 - 1  to the common substrate processing mode-based process S 2 - 2 , as described above, in the processing part  11   b , the HF gas and the NH 3  gas as processing gases are introduced while the Ar gas and the N 2  gas are being supplied, or the HF gas is introduced while the Ar gas, the N 2  gas and the NH 3  gas are being supplied. As such, an etching delay may occur when the flow rate of the Ar gas or the N 2  gas is large. In such a case, a processing time may be adjusted in anticipation of the etching delay in advance. 
     As described above, the substrate process step S 2  is ended by performing the independent substrate processing mode-based process S 2 - 2  followed by the common substrate processing mode-based process S 2 - 2 . In some embodiments, after the common substrate processing mode-based process S 2 - 2 , the independent substrate processing mode-based process S 2 - 1  and the common substrate processing mode-based process S 2 - 2  may be repeated while performing a purging process between the process S 2 - 1  and the process S 2 - 2 . 
     A specific gas flow control in this example will be described with reference to a timing chart of  FIG. 6 . First, the opening/closing valves  151   a ,  151   b ,  151   e ,  151   f ,  151   g  and  151   h  are opened so that the Ar gas, the N 2  gas and the NH 3  gas are supplied to the processing parts  11   a  and  11   b  at the predetermined same flow rates to adjust internal pressures of the processing parts  11   a  and  11   b  to a predetermined pressure, thereby stabilizing the internal pressures (in the pressure stabilizing step S 1 ). 
     At the point of time when the pressure is stabilized, the substrate process is started (in the substrate process step S 2 ). In the substrate process step S 2 , first, the opening/closing valve  151   c  is opened to supply the HF gas to the processing part  11   a  to start the COR process in the processing part  11   a , and then the independent substrate processing mode-based process S 2 - 1  with no COR process is performed for a predetermined period of time without supplying the HF gas to the processing part  11   b . At this time, since the HF gas is not supplied to the processing part  11   b , the Ar gas of the processing part  11   b  is increased in flow rate more than that of the processing part  11   a  so that the processing part  11   b  has the same internal pressure as the processing part  11   a . The Ar gas of the increased flow rate serves as a supplement gas. The increase in amount of the Ar gas (the flow rate of the supplement gas) may correspond to the amount of the HF gas supplied to the processing part  11   a.    
     After the predetermined period of time, the COR process is continued in the processing part  11   a  while maintaining all the gases at the same flow rates, and the common substrate processing mode-based process S 2 - 2  with the COR process is performed in the processing part  11   b  for a predetermined period of time by opening the opening/closing valve  151   d  to supply the HF gas to the processing part  11   b . At this time, in the processing part  11   b , the flow rate of the Ar gas supplied in the independent substrate processing mode-based process S 2 - 1  is decreased so that the processing part  11   b  has the same internal pressure as the processing part  11   a . In this case, the decrease in the amount of the Ar gas may correspond to the amount of the HF gas supplied to the processing part  11   b.    
     After the substrate process step S 2  is completed, all the opening/closing valves are closed to stop the supply of the gases and the process spaces S are exhausted by the exhaust mechanism  15  (in the exhausting step S 3 ). 
     In the example of  FIG. 6 , the HF gas is not introduced into the processing part  11   b  in the independent substrate processing mode-based process S 2 - 1 , but the HF gas is introduced into the processing part  11   b  in the common substrate processing mode-based process S 2 - 2 . In some embodiments, the HF gas and the NH 3  gas may not be introduced into the processing part  11   b  in the independent substrate processing mode-based process S 2 - 1 , but the HF gas and the NH 3  gas may be introduced into the processing part  11   b  when switching to the common substrate processing mode-based process S 2 - 2 . In this case, in the independent substrate processing mode-based process S 2 - 1 , the supplement gases to be supplied to the processing part  11   b  may be the Ar gas and the N 2  gas. 
     The result of confirming the effects of the method of this example will be described. Here, etching (COR process) was performed by the processing apparatus of  FIG. 1 . First, a processing recipe for cyclically etching a CVD-SiO 2  film in 6 sec×8 cycle was used to evaluate an etching result for a case (process A) where the etching was performed in the order of the common substrate processing mode→the independent substrate processing mode in each cycle and a case (process B) where the etching was performed in the order of the independent substrate processing mode→the common substrate processing mode in each cycle. As described above, the Ar gas, the HF gas, the N 2  gas and the NH 3  gas were supplied to both the processing parts  11   a  and  11   b  to perform the COR process in the common substrate processing mode, and the COR process was performed in only the processing part  11   a  in the independent substrate processing mode without supplying the HF gas to the processing part  11   b . That is to say, in the process A, the COR process was initially performed and subsequently the process was stopped in the processing part  11   b  in each cycle, whereas, in the processing B, the COR process was performed after initially stopping the process for a predetermined period of time in the processing part  11   b  in each cycle. 
     As a result, in the process A, the etching amount was +36.6% for the target, whereas, in the processing B, the etching amount was −10.4% for the target. From this fact, it was confirmed that the controllability of the etching amount is improved by initially performing the independent substrate processing mode-based process and then performing the common substrate processing mode-based process. 
     Next, a processing recipe for cyclically etching a thermal oxide film in 15 sec×5 cycle was used to evaluate an etching result for a case (process C) where the etching was performed in the order of the common substrate processing mode→the independent substrate processing mode in each cycle and a case (process D) where the etching was performed in the order of the independent substrate processing mode→the common substrate processing mode in each cycle. 
     As a result, in the process C, the etching amount was +12.7% for the target, whereas, in the process D, the etching amount was −5.0% for the target. Similarly in the thermal oxide film, from this fact, it was confirmed that the controllability of the etching amount is improved by initially performing the independent substrate processing mode-based process and then performing the common substrate processing mode-based process. 
     (Another Example of Process Sequence) 
     In the aforementioned example of the process sequence, in the independent substrate processing mode-based process S 2 - 1 , the Ar gas and the N 2  gas are increased to function as supplement gases in the processing part to which the processing gases (the HF gas and the NH 3  gas) are not supplied, so that a pressure difference is prevented from occurring between the processing part  11   a  and the processing part  11   b . This prevents the inflow of the gases between the processing parts  11   a  and  11   b . However, since the processing parts  11   a  and  11   b  are interconnected via the slits formed in the portions of the inner walls  71   a  and  71   b  below the substrate mounting tables  61   a  and  61   b , it is difficult to completely prevent a backward flow of the processing gases (the HF gas and the NH 3  gas) from one processing part to the other processing part and completely prevent a backward flow of the supplement gases (the Ar gas and the N 2  gas) from the other processing part to one processing part. Thus, a backward flow of tiny amounts of gases (gas backward diffusion) occurs. When the flow rates of the processing gases are equal to or higher than a certain level, such a backward flow of tiny amounts of gases does not greatly affect the etching amount, which makes it possible to realize a process with a desired etching amount in the processing parts  11   a  and  11   b . However, in the process of a low flow rate region, the influence of such a gas backward flow cannot be ignored and a deviation from a set etching amount becomes large, which may make it impossible to perform a desired process in the processing parts  11   a  and  11   b  independently of each other. 
     On the other hand, if the flow rates of the processing gases (the HF gas and the NH 3  gas) and the supplement gases (the Ar gas and the N 2  gas) are increased in order to avoid such a problem, the etching rate increases and it is therefore necessary to adjust the etching amount with the processing time and the gas flow rate, which may result in a narrow process margin. 
     Therefore, in this example, during the pressure stabilizing step S 1 , a pressure regulating gas is flowed at a sufficient flow rate to prevent the processing gases and the supplement gases from backwardly diffusing between the processing parts  11   a  and  11   b  in the independent substrate processing mode-based process S 2 - 2  of the subsequent substrate process step S 2 , and to form a flow of gas flowing from the gas introducing members  12   a  and  12   b  to the exhaust mechanism  15 . This effectively prevents the backward flow (backward diffusion) of gases in the low flow rate region in the independent substrate processing mode-based process S 2 - 2  of the substrate process step S 2 . 
     Specifically, as illustrated in a timing chart of  FIG. 7 , the Ar gas, the N 2  gas and the NH 3  gas are supplied as the pressure regulating gases to both the processing parts  11   a  and  11   b  during the pressure stabilizing step S 1 . The flow rates of the Ar gas, the N 2  gas and the NH 3  gas are set to be larger than those in the substrate process step S 2 . In this case, the total flow rate of the pressure regulating gases may be three times or more as large as that in the substrate process step S 2 . As the pressure regulating gas, a portion of the gases supplied during the substrate process step S 2 , which does not cause substrate process, may be used. As in the example of  FIG. 6 , as the pressure regulating gases, the Ar gas, the N 2  gas and the NH 3  gas may be used in the processing part  11   a , and the Ar gas and the N 2  gas may be used in the processing part  11   b.    
     In this example, in the subsequent substrate process step S 2 , in the independent substrate processing mode-based process S 2 - 1 , the flow rates of the Ar gas, the N 2  gas and the NH 3  gas are decreased until reaching a normal state, and the HF gas is supplied at a predetermined flow rate to perform the COR process in the processing part  11   a , whereas the flow rates of the N 2  gas and the NH 3  gas in the processing part  11   b  are set to be equal to those in the processing part  11   a . The supply amount of the Ar gas is adjusted so as to include a supplement gas corresponding to the HF gas supplied to the processing part  11   a . In the subsequent common substrate processing mode-based process S 2 - 2 , the HF gas is also supplied to the processing part  11   b , the flow rate of the Ar gas supplied as a supplement gas is reduced by the supply amount of the HF gas. Thus, the COR process is performed in the processing parts  11   a  and  11   b  under the same processing conditions. Thereafter, the supply of the gases is stopped and the exhausting step S 3  is performed to exhaust the process spaces S by the exhaust mechanism  15 . 
     Thus, in the low flow rate region, in the independent substrate processing mode-based process S 2 - 2 , it is possible to prevent the backward flow of the processing gases and the supplement gases more effectively than that in a case of only adjusting the pressure with the supplement gases. More specifically, even in the low flow rate region, it is possible to extremely effectively prevent the processing gases (the HF gas and the NH 3  gas) from flowing backward from the processing part  11   a  to the processing part  11   b  intended to stop the process, and also prevent the supplement gases (the Ar gas and the N 2  gas) from flowing backward from the processing part  11   b  to the processing part  11   a  intended to continue the process. It is therefore possible to perform the substrate process so that the etching amount is close to the etching amount set in both the processing parts  11   a  and  11   b.    
     In the example of  FIG. 7 , the HF gas is not introduced into the processing part  11   b  in the independent substrate processing mode-based process S 2 - 1 , whereas the HF gas is introduced into the processing part  11   b  in the common substrate processing mode-based process S 2 - 2 . However, the HF gas and the NH 3  gas may not be introduced into the processing part  11   b  in the independent substrate processing mode-based process S 2 - 1 . The HF gas and the NH 3  gas may be introduced into the processing part  11   b  when switching to the common substrate processing mode-based process S 2 - 2 . In this case, in the independent substrate processing mode-based process S 2 - 1 , the supplement gases supplied to the processing part  11   b  may be the Ar gas and the N 2  gas. 
     The effects achieved when the flow rate of the pressure regulating gas is actually increased in the pressure stabilizing step will be described with reference to  FIG. 8 . Here, after performing the pressure stabilizing step using the apparatus of  FIG. 1 , the COR process was initially performed in the processing part  11   a  in the substrate process step. The HF gas was not supplied to the processing part  11   b , and the independent substrate processing mode-based process was performed to supplement an Ar gas as a supplement gas at a flow rate corresponding to the amount of the not-supplied HF gas. Therefore, the COR process was performed in both the processing parts in the common substrate processing mode.  FIG. 8  is a view illustrating the total gas flow rate during the substrate process step and an etching amount deviation (a difference between the actual etching amount and the set etching amount) in the COR process in the processing part  11   a . In  FIG. 8 , a black circle indicates an etching amount deviation when the flow rates of the pressure regulating gases (the Ar gas, the N 2  gas and the NH 3  gas) in the pressure stabilizing step are set to be equal to those in the substrate process step. The etching amount deviation tends to be large in a region where the total flow rate is low. The etching amount deviation is as large as about −0.33 nm at the total flow rate of 300 sccm. On the other hand, a black square indicates an etching amount deviation available when the flow rates of the pressure regulating gases are tripled. In this case, even when the total flow rate during the substrate process step is 300 sccm, the etching amount deviation is about −0.03 nm, which is very close to the set value. The effect of increasing the flow rates of the pressure regulating gases was confirmed from this fact. 
     As described above, when the COR process is performed on a SiO 2  film formed on a wafer using the HF gas and the NH 3  gas, ammonium fluorosilicate ((NH 4 ) 2 SiF 6 : AFS) is generated as a reaction product. Thus, the wafer processed in the COR processing apparatus  100  is heat-treated in a heat treating apparatus to decompose and remove the AFS. 
     As described above, according to the present embodiment, in performing the COR process on the two wafers respectively in the processing part  11   a  and the processing part  11   b , while the exhaust mechanism  15  is used in a collective manner, the process is initially performed in only one of the processing part  11   a  and the processing part  11   b  in the independent substrate processing mode, and subsequently, the COR process is performed in the processing parts in the common substrate processing mode under the same conditions. This improves the controllability of the etching amount. 
     &lt;Other Applications&gt; 
     Although the present disclosure has been described by way of an embodiment, the present disclosure is not limited to the above embodiment but various modifications can be made without departing from the spirit and scope of the present disclosure. 
     While in the above embodiment, the HF gas and the NH 3  gas have been described to be used to perform the COR process, the COR process may be performed with only the HF gas or the NH 3  gas by the substrate processing device of  FIG. 1 . For example, in a case in which an HF gas diluted with an Ar gas is supplied to perform the COR process, the opening/closing valves may be controlled as shown in the following Case d. Specifically, the independent substrate processing mode-based process may be performed using the HF gas only in the processing part  11   a . Subsequently, with the opening/closing valves  151   e ,  151   f ,  151   g  and  151   h  closed, the opening/closing valves  151   a ,  151   b ,  151   c  and  151   d  may be opened to supply the HF gas and the Ar gas to perform the common substrate processing mode-based process. 
     [Cased] 
     Supply System to Gas Introduction Member  12   a   
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 Opening/closing valve 151a (Ar) 
                 Opened 
               
               
                   
                 Opening/closing valve 151c (HF) 
                 Opened 
               
               
                   
                 Opening/closing valve 151e (N 2 ) 
                 Closed 
               
               
                   
                 Opening/closing valve 151g (NH 3 ) 
                 Closed 
               
               
                   
                   
               
            
           
         
       
     
     Supply System to Gas Introduction Member  12   b   
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 Opening/closing valve 151b (Ar) 
                 Opened 
               
               
                   
                 Opening/closing valve 151d (HF) 
                 Closed 
               
               
                   
                 Opening/closing valve 151f (N 2 ) 
                 Closed 
               
               
                   
                 Opening/closing valve 151h (NH 3 ) 
                 Closed 
               
               
                   
                   
               
            
           
         
       
     
     In addition, the substrate processing device is not limited to the COR processing apparatus  100  of  FIG. 1  as long as it is schematically configured as illustrated in  FIG. 9  such that the processing parts  11   a  and  11   b  are installed in a single common chamber  10  and the exhaust mechanism  15  is shared by the processing parts  11   a  and  11   b  installed inside the single common chamber  10 . 
     Further, the present disclosure is limited to the configuration of  FIG. 9  where the processing parts  11   a  and  11   b  are installed inside the single common chamber  10 . As an example, as illustrated in  FIG. 10 , the processing parts  11   a  and  11   b  may be respectively installed inside separate chambers  10   a  and  10   b , and the exhaust mechanism  15  may be shared by the separate chambers  10   a  and  10   b.    
     While in the above embodiment, the Ar gas or the N 2  gas, which is a dilution gas for diluting the processing gas such as the HF gas or the NH 3  gas, is used as a supplement gas for pressure regulation, but the present disclosure is limited to thereto. As an example, the supplement gas may be another inert gas. In addition, the supplement gas for pressure regulation is not limited to the inert gas but may be a non-reactive gas which is not reactive with etching target films of processed wafers Wa and Wb. Further, a reactive gas may be used as long as it can regulate the pressure without affecting the process. 
     In the above embodiment, the dilution gas is used as a supplement gas for pressure regulation together with the processing gas during the substrate process. However, separately from the dilution gas used together with the processing gas, a dedicated supplement gas may be used. In this case, a dedicated supplement gas supply source, a dedicated supplement gas supply pipe and dedicated MFCs and dedicated opening/closing valves may be additionally installed in the gas supply mechanism  14 . 
     Further, in the above embodiment, a semiconductor wafer has been described as an example of a target substrate. However, it is obvious that the target substrate is not limited to the semiconductor wafer in the principle of the present disclosure and it is to be understood that it can be applied to different various substrate processes. 
     Furthermore, in the above embodiment, the apparatus provided with the two processing parts  11   a  and  11   b  as a plurality of processing parts has been described as an example, but the number of processing parts is not limited to two. 
     Moreover, in the above embodiment, the substrate processing device of the present disclosure has been described to be applied as the COR processing apparatus, but the substrate processing device is not limited to the COR processing apparatus. 
     EXPLANATION OF REFERENCE NUMERALS 
       10 ,  10   a ,  10   b : chamber,  11   a ,  11   b : processing part,  12   a ,  12   b : gas introduction member,  14 : gas supply mechanism,  15 : exhaust mechanism,  16 : control part,  71   a ,  71   b : inner wall,  101 : exhaust pipe,  141 : Ar gas supply source,  142 : HF gas supply source,  143 : N 2  gas supply source,  144 : NH 3  gas supply source,  145 ,  145   a ,  145   b : HF gas supply pipe,  146   a ,  146   b : supply pipe,  147 ,  147   a ,  147   b : Ar gas supply pipe,  148 ,  148   a ,  148   b : NH 3  gas supply pipe,  149 ,  149   a ,  149   b : N 2  gas supply pipe,  150   a  to  150   h : mass flow controller,  151   a  to  151   h : opening/closing valve