Patent Publication Number: US-2016237568-A1

Title: Substrate processing apparatus and non-transitory computer readable recording medium

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATION 
     This U.S. non-provisional patent application claims priority under 35 U.S.C. §119 of Japanese Patent Application No. 2015-025282, filed on Feb. 12, 2015 in the Japanese Patent Office, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a substrate processing apparatus and a non-transitory computer-readable recording medium. 
     2. Description of the Related Art 
     In general, a substrate processing apparatus performing a process such as a film forming process on a substrate such as a wafer is used in a process of manufacturing a semiconductor device. The process which the substrate processing apparatus performs includes, for instance, a film forming process based on an alternate supply method. In the film forming process based on the alternate supply method, a source gas supplying process, a purging process, a reactive gas supplying process and a purging process are used as one cycle, and the cycle is repeatedly performed on a substrate to be processed a predetermined number of times (n cycles), and thereby forming a film on the substrate. The substrate processing apparatus performing the film forming process may be configured to supply various gases (a source gas, a reactive gas, a purge gas, etc.) onto a surface of the substrate to be processed from above the substrate, and to discharge the various gases supplied onto the surface of the substrate through above the substrate (e.g., see Patent document 1). 
     In the case of this substrate processing apparatus, there are a substrate support table having a substrate placement surface on which a plurality of substrates are circumferentially placed, and a gas supplier installed at a position opposite to the substrate placement surface. The gas supplier has a structure in which a gas is alternately supplied in a rotational direction of the substrate support table. In the film forming process, a film is formed on the substrate while the substrate support table is rotated below the gas supplier. Whenever the substrate support table makes a round, a monolayer film is formed on the wafer. A plurality of rotations results in forming a multilayer film, and the substrate support table is rotated until the multilayer film reaches a desired thickness. 
     RELATED ART DOCUMENTS 
     Patent Documents 
     1. Japanese Unexamined Patent Application, First Publication No. 2011-222960 
     SUMMARY OF THE INVENTION 
     When the formed film is used for, for instance, an electrode, it is necessary to make characteristics of the film uniform in a thickness direction of the film. The characteristics include, for instance, a resistance value. To achieve this, the conditions that each layer is formed are preferably consistent. For example, when the conditions are not consistent, the characteristics of the film become inconsistent, and thus a yield may be reduced. 
     An object of the present invention is to inhibit a film having inconsistent characteristics from being formed to process a substrate at a high yield. 
     According to one aspect of the present invention, there is provided a configuration including: 
     a process chamber; 
     a substrate support table disposed in the process chamber, the substrate support table including circumferentially arranged substrate placement units; 
     a rotation unit configured to rotate the substrate support table; 
     a plurality of source gas supply structures circumferentially arranged above the substrate support table; 
     a source gas supply unit configured to supply a source gas to a region below the plurality of source gas supply structures via the plurality of source gas supply structures; 
     a plurality of source gas exhaust structures configured to exhaust an atmosphere of the region below the plurality of source gas supply structures, wherein each source gas exhaust structure corresponds to each source gas supply structure; 
     a plurality of source gas exhaust pipes connected to the plurality of source gas exhaust structures, wherein each source gas exhaust pipe is connected to each source gas exhaust structure; 
     a source gas exhaust unit configured to exhaust an atmosphere of the process chamber via the plurality of source gas exhaust structures; 
     a plurality of reactive gas supply structures disposed between the plurality of source gas supply structures above the substrate support table; 
     a reactive gas supply unit configured to supply a reactive gas to a region below the plurality of reactive gas supply structures via the plurality of reactive gas supply structures; 
     a plurality of reactive gas exhaust structures configured to exhaust an atmosphere of the region below the plurality of reactive gas supply structures, wherein each reactive gas exhaust structure corresponds to each reactive gas supply structure; 
     a plurality of reactive gas exhaust pipes connected to the plurality of reactive gas exhaust structures, wherein each reactive gas exhaust pipe is connected to each reactive gas exhaust structure; 
     a reactive gas exhaust unit configured to exhaust the atmosphere of the process chamber via the plurality of reactive gas exhaust structures; 
     a plurality of reactive gas pressure detectors installed at the plurality of reactive gas exhaust pipes; and 
     a controller configured to control at least the source gas supply unit, the source gas exhaust unit, the reactive gas supply unit, the reactive gas exhaust unit and the plurality of reactive gas pressure detectors. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic cross-sectional view of a cluster type substrate processing apparatus according to a first embodiment of the present invention. 
         FIG. 2  is a schematic longitudinal sectional view of the cluster type substrate processing apparatus according to the first embodiment of the present invention. 
         FIG. 3  is a schematic cross-sectional view of a process chamber with which the substrate processing apparatus according to the first embodiment of the present invention is equipped. 
         FIG. 4  is a schematic longitudinal sectional view of the process chamber with which the substrate processing apparatus according to the first embodiment of the present invention is equipped, and is a sectional view taken along line B-B′ of the process chamber illustrated in  FIG. 3 . 
         FIG. 5  is a schematic longitudinal sectional view of the process chamber with which the substrate processing apparatus according to the first embodiment of the present invention is equipped, and is a sectional view taken along line C-C′ of the process chamber illustrated in  FIG. 3 . 
         FIG. 6  is a schematic cross-sectional view of a gas supply/exhaust structure with which the substrate processing apparatus according to the first embodiment of the present invention is equipped, and is a sectional view taken along line D-D′ of the process chamber illustrated in  FIG. 4 . 
         FIG. 7  is a schematic cross-sectional view of a gas supply/exhaust structure with which the substrate processing apparatus according to the first embodiment of the present invention is equipped, and is a sectional view taken along line E-E′ of the process chamber illustrated in  FIG. 4 . 
         FIG. 8  is an explanatory view of a gas supply unit according to the first embodiment of the present invention. 
         FIG. 9  is an explanatory view of a gas exhaust unit according to the first embodiment of the present invention. 
         FIG. 10  is an explanatory view of a gas supply unit according to the first embodiment of the present invention. 
         FIG. 11  is an explanatory view of a gas exhaust unit according to the first embodiment of the present invention. 
         FIG. 12  is an explanatory view of a gas supply unit according to the first embodiment of the present invention. 
         FIG. 13  is a flowchart illustrating a process of processing a substrate according to the first embodiment of the present invention. 
         FIG. 14  is a flowchart of a film forming process according to the first embodiment of the present invention. 
         FIG. 15  is a flowchart describing an operation of a wafer in the film forming process according to the first embodiment of the present invention. 
         FIG. 16  is an explanatory view explaining a modification of the schematic cross-sectional view of the gas supply/exhaust structure with which the substrate processing apparatus according to the first embodiment of the present invention is equipped. 
         FIG. 17  is an explanatory view of a gas exhaust unit according to a second embodiment of the present invention. 
         FIG. 18  is an explanatory view of the gas exhaust unit according to the second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     First Embodiment of the Present Invention 
     Configuration of Substrate Processing Apparatus 
     First, a substrate processing apparatus  10  according to the present embodiment will be described using  FIGS. 1 and 2 .  FIG. 1  is a cross-sectional view of a cluster type substrate processing apparatus  10  according to the present embodiment.  FIG. 2  is a schematic longitudinal sectional view of the cluster type substrate processing apparatus  10  according to the present embodiment. 
     In the substrate processing apparatus  10  to which the present invention is applied, a front opening unified pod  100  (hereinafter abbreviated to “FOUP”) is used as a carrier that carries a wafer  200  acting as a substrate. The carrier of the cluster type substrate processing apparatus  10  according to the present embodiment is divided into a vacuum side and an atmospheric side. 
     Further, the front, rear, left and right described below are based on  FIG. 1 . An X 1  direction shown in  FIG. 1  is defined as the right, an X 2  direction as the left, a Y 1  direction as the front, and a Y 2  direction as the rear. 
     [Configuration of Vacuum Side] 
     As illustrated in  FIGS. 1 and 2 , the substrate processing apparatus  10  is equipped with a first conveyance chamber  103  capable of withstanding a pressure (negative pressure) that is less than atmospheric pressure, for instance, is in a vacuum state. A housing  101  of the first conveyance chamber  103  has, for instance, a pentagonal shape in a planar view, and is formed in a box shape in which both upper and lower ends are closed. Note that the “planar view” described below refers to when the substrate processing apparatus  10  is viewed from a vertical upper side thereof toward a vertical lower side thereof. 
     A first wafer transfer machine  112  capable of transferring two wafers  200  under negative pressure at the same time is installed in the first conveyance chamber  103 . Here, the first wafer transfer machine  112  may transfer one wafer  200 . The first wafer transfer machine  112  is configured to be elevated by a first wafer transfer machine elevator  115  while maintaining airtightness of the first conveyance chamber  103 . 
     Spare chambers (load lock chambers)  122  and  123  are connected to a sidewall located at a front side among five sidewalls of the housing  101  via respective gate valves  126  and  127 . The spare chambers  122  and  123  are configured to combine a function of loading the wafer  200  and a function of unloading the wafer  200 , and are configured in a structure in which each thereof can withstand a negative pressure. 
     Further, the two wafers  200  can be placed in each of the spare chambers  122  and  123  in an overlapped state by a substrate support  140 . A partition plate (middle plate)  141  disposed between the wafers  200  is installed in each of the spare chambers  122  and  123 . 
     A first process chamber  202   a , a second process chamber  202   b , a third process chamber  202   c  and a fourth process chamber  202   d , each of which performs a desired process on the substrate, are connected to the four sidewalls located at a rear side (back side) among the five sidewalls of the housing  101  of the first conveyance chamber  103  so as to be adjacent to one another via gate valves  150 ,  151 ,  152  and  153 . The first process chamber  202   a , the second process chamber  202   b , the third process chamber  202   c  and the fourth process chamber  202   d  will be described below in detail. 
     [Configuration of Atmospheric Side] 
     A second conveyance chamber  121  capable of conveying the wafer  200  under vacuum and atmospheric pressure is connected to front sides of the spare chambers  122  and  123  via gate valves  128  and  129 . A second substrate transfer machine  124  transferring the wafer  200  is installed in the second conveyance chamber  121 . The second substrate transfer machine  124  is configured to be elevated by a second substrate transfer machine elevator  131  installed in the second conveyance chamber  121 , and to be reciprocated in a leftward/rightward direction by a linear actuator  132 . 
     A notch alignment device  106  is installed at a left side of the second conveyance chamber  121 . Alternatively, the notch alignment device  106  may be an orientation flat alignment device. Further, a clean unit  118  supplying clean air is installed at an upper portion of the second conveyance chamber  121 . 
     A substrate loading/unloading port  134  for loading or unloading the wafer  200  into or from the second conveyance chamber  121  and a FOUP opener  108  are installed at a front side of a housing  125  of the second conveyance chamber  121 . A load port ( 10  stage)  105  is installed at a side opposite to the FOUP opener  108 , i.e., at an outer side of the housing  125  via the substrate loading/unloading port  134 . The FOUP opener  108  is equipped with a closure  142  that opens/closes a cap  100   a  of the FOUP  100  and can block the substrate loading/unloading port  134 , and a drive mechanism  136  that drives the closure  142 . Access of the wafer  200  to the FOUP  100  is allowed by opening/closing the cap  100   a  of the FOUP  100  placed on the load port  105 . Further, the FOUP  100  is adapted to be supplied to and discharged from the load port  105  by an in-process conveyance device (OHT, etc.) which is not illustrated. 
     [Configuration of Process Chamber] 
     Subsequently, a configuration of the process chamber acting as a process furnace according to the present embodiment will be described using  FIGS. 3 to 7 .  FIG. 3  is a schematic cross-sectional view of the process chamber with which the substrate processing apparatus  10  according to the present embodiment is equipped, and is a cross-sectional view taken along line A-A′ of  FIG. 4 or 5 .  FIG. 4  is a schematic cross-sectional view of the process chamber with which the substrate processing apparatus  10  according to the present embodiment is equipped, and is a cross-sectional view taken along line B-B′ of the process chamber illustrated in  FIG. 3 .  FIG. 5  is a schematic cross-sectional view of the process chamber with which the substrate processing apparatus  10  according to the present embodiment is equipped, and is a cross-sectional view taken along line C-C′ of the process chamber illustrated in  FIG. 3 .  FIG. 6  is an explanatory view explaining a first gas supply/exhaust structure  240  and a second gas supply/exhaust structure  280 .  FIG. 7  is an explanatory view explaining a third gas supply structure  320 .  FIG. 8  is an explanatory view explaining a gas supply unit  250  supplying a first gas, and  FIG. 9  is an explanatory view explaining a gas exhaust unit  270  exhausting the first gas.  FIG. 10  is an explanatory view explaining a gas supply unit  290  supplying a second gas, and  FIG. 11  is an explanatory view explaining a gas exhaust unit  310  exhausting the second gas.  FIG. 12  is an explanatory view explaining a gas supply unit  330  supplying a third gas. 
     A relation between the configurations of  FIGS. 4, 8, 9, 10, 11 and 12  will be described for the sake of convenience of description as follows. F 1  of  FIG. 4  is connected to F 1  of  FIG. 8 . The same is true of F 2  and F 3 . G 1  of  FIG. 4  is connected to G 1  of  FIG. 9 . The same is true of G 2  and G 3 . H 1  of  FIG. 4  is connected to H 1  of  FIG. 10 . The same is true of H 2  and H 3 . J 1  of  FIG. 4  is connected to J 1  of  FIG. 11 . The same is true of J 2  and J 3 . K 1  of  FIG. 4  is connected to K 1  of  FIG. 12 . The same is true of K 2  to K 6 . 
     In the present embodiment, the first process chamber  202   a , the second process chamber  202   b , the third process chamber  202   c  and the fourth process chamber  202   d  are configured to be identical to each other. Hereinafter, the first process chamber  202   a , the second process chamber  202   b , the third process chamber  202   c  and the fourth process chamber  202   d  are referred to collectively as a “process chamber  202 .” 
     [Process Chamber] 
     As illustrated in  FIGS. 3 to 5 , the process chamber  202  acting as the process furnace is equipped with a reaction vessel  203  that is a cylindrical airtight vessel. A process room  201  processing the wafer  200  is formed in the reaction vessel  203 . 
     A gas supply/exhaust structure  240  supplying a first gas, a gas supply/exhaust structure  280  supplying a second gas, and a gas supply structure  320  supplying an inert gas are installed upside in the reaction vessel  203 . As illustrated in  FIG. 4 , the gas supply/exhaust structure  240 , the gas supply structure  320 , the gas supply/exhaust structure  280  and the gas supply structure  320  are alternately disposed in a rotational direction of a susceptor (substrate support table)  220  to be described below. For example, three gas supply/exhaust structures  240 , three gas supply/exhaust structures  280  and six gas supply structures  320  are disposed. 
     In the plurality of gas supply/exhaust structures  240 , a gas supply/exhaust structure  240   a , a gas supply/exhaust structure  240   b  and a gas supply/exhaust structure  240   c  are disposed in that order in the rotational direction. In the plurality of gas supply/exhaust structures  280 , a gas supply/exhaust structure  280   a , a gas supply/exhaust structure  280   b  and a gas supply/exhaust structure  280   c  are disposed in that order in the rotational direction. In the plurality of gas supply structures  320 , a gas supply structure  320   a , a gas supply structure  320   b , a gas supply structure  320   c , a gas supply structure  320   d  and a gas supply structure  320   f  are disposed in that order in the rotational direction. 
     As described below, the wafer  200  placed on the susceptor  220  passes through regions below the three gas supply/exhaust structures  240 , the three gas supply/exhaust structures  280  and the six gas supply structures  320 . By passing through the below regions, whenever the susceptor  220  is rotated once, a plurality of films are formed. Due to this structure, a process having higher throughput than the related art is possible. 
     Further, as described below, the gas supply/exhaust structure  240  includes a gas supply structure  241  and a gas exhaust structure  243  configured to surround it in a horizontal direction. A gas supply channel  245  is formed inside the gas supply structure  241 . Further, a gas exhaust channel  246  is formed between the gas supply structure  241  and the gas exhaust structure  243 . Further, the gas supply/exhaust structure  280  includes a gas supply structure  281  and a gas exhaust structure  283  configured to surround it in a horizontal direction. A gas supply channel  285  is formed inside the gas supply structure  281 . Further, a gas exhaust channel  286  is formed between the gas supply structure  281  and the gas exhaust structure  283 . 
     Therefore, the first gas exhaust channel  246 , the first gas supply structure  241 , the first gas exhaust channel  246 , the third gas supply structure  320 , the second gas exhaust channel  286 , the second gas supply structure  281 , the second gas exhaust channel  286  and the third gas supply structure  320  are combined and disposed in turn in the rotational direction. 
     A lower end of each gas supply/exhaust structure and a lower end of each gas supply structure are disposed such near the susceptor  220  as to avoid interference with the wafer  200 . Thereby, an amount of exposure of the gas to the wafer  200  is increased, and film thickness uniformization of the film formed on the wafer and an increase in use efficiency of the gas are realized. 
     As another method for increasing the amount of exposure of the gas, there is a method of increasing a pressure of the region below the gas supply structure. As the method of increasing the pressure, for example, there is a method of increasing an area of a bottom wall of the gas supply structure to make it difficult for the gas to leak out. When the pressure is increased, the pressure is controlled to be uniform in the regions below the gas supply/exhaust structure  240   a , the gas supply/exhaust structure  240   b  and the gas supply/exhaust structure  240   c . Thereby, process conditions of the gas supply/exhaust structure  240   a , the gas supply/exhaust structure  240   b  and the gas supply/exhaust structure  240   c  can be equalized. As a result, characteristics of layers formed when passing through the respective below regions can be equalized. 
     Similarly, the pressure is controlled to be uniform in the regions below a gas supply/exhaust structure  280   a , a gas supply/exhaust structure  280   b  and a gas supply/exhaust structure  280   c . Thereby, process conditions of the gas supply/exhaust structure  280   a , the gas supply/exhaust structure  280   b  and the gas supply/exhaust structure  280   c  can be equalized. As a result, characteristics of layers formed when passing through the respective below regions can be equalized. 
     [Susceptor] 
     The susceptor  220  that acts as the substrate support table and is configured to be rotatable with the center of a rotating shaft placed in the center of the reaction vessel  203  is installed below gas supply holes, i.e., in the middle of a bottom side in the reaction vessel  203 . The susceptor  220  is formed of a non-metal material such as aluminum nitride (AlN), ceramic or quartz so as to be able to reduce metal contamination of the wafer  200 . Further, the susceptor  220  is electrically insulated from the reaction vessel  203 . 
     The susceptor  220  is configured to arrange and support a plurality of wafers  200  (five wafers in the present embodiment) on the same plane or in a same circumferential shape in the reaction vessel  203 . Here, the same plane is not limited to completely the same plane, and may be arranged such that the plurality of wafers  200  do not overlap each other when the susceptor  220  is viewed from the top. Further, the susceptor  220  is configured to arrange and dispose the plurality of wafers  200  in the rotational direction. 
     Wafer placement units  221  are installed at positions at which the wafers  200  are supported on the surface of the susceptor  220 . The wafer placement units  221 , the number of which is equal to the number of wafers  200  to be processed, are disposed at regular intervals (for instance, intervals of 72 degrees) at positions on the concentric circle from the center of the susceptor  220 . 
     Each of the wafer placement units  221  is, for instance, a circular shape when viewed from the top of the susceptor  220 , and a recessed shape when viewed from the side. A diameter of the wafer placement unit  221  is preferably configured to be slightly larger than that of the wafer  200 . The wafer  200  is placed in the wafer placement unit  221 , and thereby the wafer  200  can be easily positioned. Furthermore, the wafer  200  can be inhibited from being improperly positioned, for instance from protruding from the susceptor  220 , by a centrifugal force involved in rotation of the susceptor  220 . 
     The susceptor  220  is provided with an elevation mechanism  222  elevating the susceptor  220 . The elevation mechanism  222  is connected to a controller  400  to be described below, and the susceptor  220  is elevated according to an instruction of the controller  400 . Each of the wafer placement units  221  of the susceptor  220  is provided with a plurality of through-holes  223 . Wafer elevation pins  224  are provided in the respective through-holes  223 . When the wafer  200  is placed, the susceptor  220  moves to a conveyance position to bring lower ends of the wafer elevation pins  224  into contact with a bottom surface of the reaction vessel  203 . The wafer elevation pins  224  brought into contact moves up to a position higher than a surface of the wafer placement unit  221 . In this way, the wafer  200  moves up from the surface of the wafer placement unit  221 , and the wafer is placed. 
     A shaft of the susceptor  220  is provided with a rotary mechanism  225  rotating the susceptor  220 . A rotary shaft of the rotary mechanism  225  is configured to be connected to the susceptor  220  so as to be able to rotate the susceptor  220  by operating the rotary mechanism  225 . Further, the susceptor  220  is configured to be rotated, and thereby the plurality of wafer placement units  221  are rotated en bloc. The rotary mechanism  225  is also called a rotation unit. 
     The controller  400  to be described below is connected to the rotary mechanism  225  via a coupler  226 . The coupler  226  is configured, for instance, as a slip ring mechanism that provides electrical connection between a rotary side and a stationary side using a metal brush. This prevents the rotation of the susceptor  220  from being obstructed. The controller  400  is configured to control an electrical conduction state to the rotary mechanism  225  so as to rotate the susceptor  220  at a given speed for a given time. 
     [Heating Unit] 
     A heater  228  acting as a heating unit is configured to be integrally embedded in the susceptor  220  so as to be able to heat the wafer  200 . When power is supplied to the heater  228 , a surface of the wafer  200  is configured to be heatable to a given temperature (for instance, room temperature to about 1,000° C.). Alternatively, a plurality of heaters  228  (for instance, five heaters) may be provided on the same plane so as to individually heat the respective wafers placed on the susceptor  220 . 
     The susceptor  220  is provided with a temperature sensor  227 . A power regulator  230 , a heater power supply  231  and a temperature regulator  232  are electrically connected to the heaters  228  and the temperature sensor  227  via a power supply cable  229 . The electrical conduction to the heaters  228  is configured to be controlled based on information about a temperature detected by the temperature sensor  227 . 
     [Gas Supply/Exhaust Structure] 
     The gas supply/exhaust structure  240 , gas supply/exhaust structure  280  and gas supply structure  320  are radially provided radially when viewed from the middle of a ceiling that is an upper side of the process chamber. 
     The gas supply/exhaust structure  240  has the first gas supply structure  241  supplying a first gas, and is provided with the gas exhaust structure  243  so as to surround it. The gas supply/exhaust structure  280  has the second gas supply structure  281  supplying a second gas, and is provided with the gas exhaust structure  283  so as to surround it. The gas supply structure  320  has the third gas supply structure  321  supplying an inert gas. 
     The first gas supply structure  241 , the second gas supply structure  281  and the third gas supply structure  320  are shaped of, for instance, a pedestal. A susceptor radial width of each structure is at least set to be larger than a diameter of the wafer  200 , and thereby a structure in which a gas can be supplied to the entire surface of the wafer  200  passing through a region below each gas supply hole is formed. 
     The first gas exhaust channel  246  is provided to surround the first gas supply structure  241  in a horizontal direction, and evaculates the first gas that is not attached to the surface of the wafer  200  or the susceptor  220  and the inert gas that is supplied by the neighboring third gas supply structures  320 . With this configuration, it is possible to prevent mixture with the second gas supplied to the neighboring spaces. 
     The first gas exhaust channel  246  is provided between the neighboring third gas supply structures  320  as well as at a center side or an outer circumference side of the process chamber, for instance, when viewed from the gas supply structure. 
     The first gas exhaust channel  246  is provided at the center side of the process chamber, and thereby a large quantity of gas is prevented from being introduced into the center of the process chamber or the neighboring gas supply regions via the center of the process chamber. Here, the process chamber center side of the first gas exhaust channel  246  is referred to as an inner circumference gas migration inhibition portion. 
     Further, the first gas exhaust channel  246  is provided at the outer circumference side of the process chamber, and thereby a large quantity of gas is prevented from being introduced in a wall direction of the process chamber. Here, the process chamber outer circumference side of the first gas exhaust channel  246  is referred to as an outer circumference gas migration inhibition portion. 
     The second gas exhaust channel  286  is provided to surround the second gas supply structure  281  in a horizontal direction, and evaculates the second gas that is not attached to the surface of the wafer  200  or the susceptor  220  and the inert gas that is supplied by the neighboring third gas supply structures  320 . With this configuration, it is possible to prevent mixture with the first gas supplied to the neighboring spaces. 
     The second gas exhaust channel  286  is provided between the neighboring third gas supply structures  320  as well as at a center side or an outer circumference side of the process chamber, for instance, when viewed from the gas supply structure. 
     The second gas exhaust channel  286  is provided at the center side of the process chamber, and thereby a large quantity of gas is prevented from being introduced into the center of the process chamber or the neighboring gas supply regions via the center of the process chamber. Here, the process chamber center side of the second gas exhaust channel  286  is referred to as an inner circumference gas migration inhibition portion. 
     Further, the second gas exhaust channel  286  is provided at the outer circumference side of the process chamber, and thereby a large quantity of gas is prevented from being introduced in a wall direction of the process chamber. Here, the process chamber outer circumference side of the second gas exhaust channel  286  is referred to as an outer circumference gas migration inhibition portion. 
     The inner circumference gas migration inhibition portion of the first gas exhaust channel  246  and the inner circumference gas migration inhibition portion of the second gas exhaust channel  286  may be referred to collectively as an inner circumference gas migration inhibition portion. Further, the outer circumference gas migration inhibition portion of the first gas exhaust channel  246  and the outer circumference gas migration inhibition portion of the second gas exhaust channel  286  may be referred to collectively as an outer circumference gas migration inhibition portion. 
     When arrangement of the gas supply/exhaust structure  240 , the gas supply/exhaust structure  280  and the gas supply structure  320  is viewed from the side in the rotational direction, a plurality of combinations, in each of which the first gas exhaust channel  246 , the first gas supply structure  241 , the first gas exhaust channel  246 , the third gas supply structure  320 , the second gas exhaust channel  286 , the second gas supply structure  281 , the second gas exhaust channel  286  and the third gas supply structure  320  are combined in that order, are disposed. By disposing the plurality of combinations, the number of layers per one rotation is increased to enhance process throughput. 
     In the present embodiment, the description has been made using the three gas supply/exhaust structures  240  of the gas supply/exhaust structure  240   a  to the gas supply/exhaust structure  240   c . However, the present embodiment is not limited thereto, and four or more gas supply/exhaust structures may be used. 
     Further, in the present embodiment, the description has been made using the three gas supply/exhaust structures  280  that are the gas supply/exhaust structure  280   a  to the gas supply/exhaust structure  280   c . However, the present embodiment is not limited thereto, and four or more gas supply/exhaust structures may be used. 
     Furthermore, in the present embodiment, the description has been made using the six gas supply/exhaust structures  320  that are the gas supply structure  320   a  to the gas supply structure  320   f . However, the present embodiment is not limited thereto, and seven or more gas supply structures may be used. 
     Subsequently, a specific structure of the gas supply/exhaust structure  240  will be described using  FIG. 6 .  FIG. 6  is a view illustrating a cross section taken along line D-D′ of  FIG. 4  when viewed in a diagonal view direction. Note that parentheses of  FIG. 6  indicate a symbol of the gas supply/exhaust structure  280  to be described below. 
     The gas supply/exhaust structure  240  has the first gas supply structure  241  supplying a first gas. A supply pipe  242  is connected to an upper side of the first gas supply structure  241 . The first gas exhaust structure  243  is provided to cover the first gas supply structure  241 . The supply pipe  242  is connected to a downstream supply pipe  251  of  FIG. 8 . To be specific, a supply pipe  242   a  is connected to a downstream supply pipe  251   a , a supply pipe  242   b  is connected to a downstream supply pipe  251   b , and a supply pipe  242   c  is connected to a downstream supply pipe  251   c.    
     An exhaust pipe  244  is connected to the first gas exhaust structure  243 . The exhaust pipe  244  is connected to an upstream side exhaust pipe  271  of  FIG. 9 . To be specific, an exhaust pipe  244   a  is connected to an upstream side exhaust pipe  271   a , an exhaust pipe  244   b  is connected to an upstream side exhaust pipe  271   b , and an exhaust pipe  244   c  is connected to an upstream side exhaust pipe  271   c.    
     The gas supplied through the supply pipe  242  is supplied to the process chamber via the gas supply channel  245  that is an inner space of the first gas supply structure  241 . A space is provided between the gas supply structure  241  and the gas exhaust structure  243 , and is used as the first gas exhaust channel  246  through which the gas exhausted from the process chamber flows. 
     Subsequently, a specific structure of the gas supply/exhaust structure  280  will be described using  FIG. 6 . The gas supply/exhaust structure  280  has the second gas supply structure  281  supplying a second gas. The second gas exhaust structure  283  is provided to cover the second gas supply structure  281 . Supply pipes  282  are connected to the second gas supply structure  281 . To be specific, a supply pipe  282   a  is connected to a downstream supply pipe  291   a , a supply pipe  282   b  is connected to a downstream supply pipe  291   b , and a supply pipe  282   c  is connected to a downstream supply pipe  291   c.    
     An exhaust pipe  284  is connected to the second gas exhaust structure  283 . The exhaust pipe  284  is connected to an upstream side exhaust pipe  311  of  FIG. 11 . To be specific, an exhaust pipe  284   a  is connected to an upstream side exhaust pipe  311   a , an exhaust pipe  284   b  is connected to an upstream side exhaust pipe  311   b , and an exhaust pipe  284   c  is connected to an upstream side exhaust pipe  311   c.    
     The gas supplied through the supply pipes  282  is supplied to the process chamber via the gas supply channel  285  that is an inner space of the gas supply structure  281 . A space is provided between the gas supply structure  281  and the gas exhaust structure  283 , and is used as the second gas exhaust channel  286  through which the gas exhausted from the process chamber flows. 
     Subsequently, a specific structure of the gas supply structure  320  will be described using  FIG. 7 . The gas supply structure  320  includes a third gas supply structure  321  supplying a third gas. Supply pipes  322  are connected to the gas supply structure  320 . 
     The supply pipes  322  are connected to downstream supply pipes  331  of  FIG. 12 . To be specific, a supply pipe  322   a  is connected to a downstream supply pipe  331   a , a supply pipe  322   b  is connected to a downstream supply pipe  331   b , a supply pipe  322   c  is connected to a downstream supply pipe  331   c , a supply pipe  322   d  is connected to a downstream supply pipe  331   d , a supply pipe  322   e  is connected to a downstream supply pipe  331   e , and a supply pipe  322   f  is connected to a downstream supply pipe  331   f . The gas supplied through the supply pipes  322  is supplied to the process chamber via a gas supply channel  323  that is an inner space of the third gas supply structure  321 . 
     [Gas Supply Unit and Gas Exhaust Unit] 
     Subsequently, a gas supply unit that supplies a gas to each of the gas supply/exhaust structure  240 , the gas supply/exhaust structure  280  and the gas supply structure  320  will be described. 
     [First Gas Supply Unit] 
     The first gas supply unit  250  will be described using  FIG. 8 . The first gas supply unit  250  functions to supply the gas to the gas supply/exhaust structure  240 . This will be described below in detail. 
     The first gas supply unit  250  includes a plurality of downstream supply pipes  251 . The downstream supply pipes  251  are connected to the respective gas supply/exhaust structures  240 . To be specific, a downstream supply pipe  251   a  is connected to a supply pipe  242   a , a downstream supply pipe  251   b  is connected to a supply pipe  242   b , and a downstream supply pipe  251   c  is connected to a supply pipe  242   c.    
     The plurality of downstream supply pipes  251  are joined at an upstream confluence part  252 . A supply pipe  253  is connected upstream from the confluence part. A first gas source  254  is connected to an upstream end of the supply pipe  253 . A mass flow controller (MFC)  255  acting as a flow rate regulator (flow rate regulation unit) and an opening/closing valve  256  are provided from upstream between the first gas source  254  and the confluence part. 
     A gas containing a first element (hereinafter referred to as “first element-containing gas” or “first gas”) is supplied to the gas supply/exhaust structure  240  through the upstream supply pipe  253  via the mass flow controller  255  and the valve  256 . 
     The first element-containing gas is a source gas, that is, one of process gases. The first element is, for instance, titanium (Ti). That is, the first element-containing gas is, for instance, a titanium-containing gas. The first element-containing gas may be any one of a solid, a liquid and a gas at room temperature under normal pressure. When the first element-containing gas is the liquid at room temperature under normal pressure, a vaporizer (not shown) may be provided between the first gas source  254  and the mass flow controller  255 . Here, the description will be made as the gas. 
     A downstream end of a first inert gas supply pipe  257  is connected downstream relative to the valve  256  of the upstream supply pipe  253 . An inert gas source  258 , a mass flow controller (MFC)  259  that is a flow rate controller (flow rate control unit) and a valve  260  that is an opening/closing valve are provided for the first inert gas supply pipe  257  in turn from an upstream direction. 
     Here, the inert gas is, for instance, nitrogen (N 2 ) gas. As the inert gas, a rare gas such as helium (He) gas, neon (Ne) gas or argon (Ar) gas may be used in addition to the N 2  gas. 
     The downstream supply pipe  251 , the upstream supply pipe  253 , the MFC  255  and the opening/closing valve  256  are mainly referred to as the first gas supply unit  250 . 
     Further, a first inert gas supply system is mainly configured by the first inert gas supply pipe  257 , the mass flow controller  259  and the valve  260 . The inert gas source  258 , the downstream supply pipe  251  and the upstream supply pipe  253  may be thought to be included in a first inert gas supply unit. 
     Further, the first gas source  254 , the first inert gas supply unit and the gas supply/exhaust structure  240  may be thought to be included in the first gas supply unit. 
     [First Gas Exhaust Unit] 
     Subsequently, the first gas exhaust unit  270  will be described using  FIG. 9 . The first gas exhaust unit  270  includes the upstream side exhaust pipes  271  connected to the exhaust pipes  244 . The upstream side exhaust pipes  271  are connected to the respective exhaust pipes  244 . To be specific, the exhaust pipe  244   a  is connected to the exhaust pipe  271   a , the exhaust pipe  244   b  is connected to the exhaust pipe  271   b , and the exhaust pipe  244   c  is connected to the exhaust pipe  271   c.    
     The plurality of exhaust pipes  271  are jointed at a confluence part  272 . A downstream side exhaust pipe  273  is connected downstream from the confluence part  272 . A valve  274  acing as an opening/closing valve, an auto pressure controller (APC) valve  275  acting as a pressure regulator (pressure regulation unit) and a pump  276  are disposed at the downstream side exhaust pipe  273  from upstream. 
     Each of the upstream side exhaust pipes  271  is provided with a pressure detector  277 . The pressure detector is used, for instance, as a flow rate detector. The upstream side exhaust pipe  271   a  is provided with a pressure detector  277   a , the upstream side exhaust pipe  271   b  is provided with a pressure detector  277   b , and the upstream side exhaust pipe  271   c  is provided with a pressure detector  277   c . The plurality of pressure detectors  277  provided for the first gas exhaust unit are referred to collectively as a first pressure detection unit. The pressure detectors  277  are connected to the controller  400 . A flow rate of each upstream side exhaust pipe  271  is detected by each pressure detector  277 . 
     The APC valve  275  is an opening/closing valve that can open/close a valve to perform or stop vacuum exhaust in the process room  201  and is also configured to be able to adjust a degree of valve opening to regulate pressure in the process room  201 . The exhaust unit is mainly configured by the first gas exhaust channel  246 , the upstream side exhaust pipe  271 , the downstream side exhaust pipe  273 , the valve  274  and the APC valve  275 . 
     When the first element-containing gas is used as the source gas, the first gas supply/exhaust structure may be referred to as a source gas supply/exhaust structure, the first gas supply unit may be referred to as a source gas supply unit, and the first gas exhaust unit may be referred to as a source gas exhaust unit. Further, in other components, the first gas may be replaced with the source gas. 
     [Second Gas Supply Unit] 
     The second gas supply unit  290  will be described using  FIG. 10 . The second gas supply unit  290  functions to supply a gas to the gas supply/exhaust structure  280 . This will be described below in detail. 
     The second gas supply unit  290  includes a plurality of downstream supply pipes  291 . The downstream supply pipes  291  are connected to the respective gas supply/exhaust structure  280 . To be specific, the downstream supply pipe  291   a  is connected to the supply pipe  282   a , the downstream supply pipe  291   b  is connected to the supply pipe  282   b , and the downstream supply pipe  291   c  is connected to the supply pipe  282   c.    
     The downstream supply pipes  291  are joined at a confluence part  292 , and are connected to an upstream supply pipe  293 . A second gas source  294  is connected to an upstream end of the supply pipe  293 . A mass flow controller (MFC)  295  acting as a flow rate regulator (flow rate regulation unit), an opening/closing valve  296  and a plasma generation unit  297  are provided from upstream between the second gas source  294  and the confluence part. 
     A gas containing a second element (hereinafter referred to as “second element-containing gas” or “second gas”) is supplied to the gas supply/exhaust structure  280  through the upstream supply pipe  293  via the mass flow controller  295  and the valve  296 . 
     The second element-containing gas is a reactive gas, that is, one of process gases. The second element is, for instance, nitrogen (N). That is, the second element-containing gas is, for instance, a nitrogen-containing gas. 
     A downstream end of a second inert gas supply pipe  298  is connected downstream relative to the valve  296  of the upstream supply pipe  293 . An inert gas source  299 , a mass flow controller (MFC)  300  that is a flow rate controller (flow rate control unit) and a valve  301  that is an opening/closing valve are provided for the second inert gas supply pipe  298  in turn from an upstream direction. 
     Here, the inert gas is, for instance, nitrogen (N 2 ) gas. As the inert gas, a rare gas such as helium (He) gas, neon (Ne) gas or argon (Ar) gas may be used in addition to the N 2  gas. 
     The downstream supply pipe  291 , the upstream supply pipe  293 , the MFC  295  and the opening/closing valve  296  are mainly referred to as the second gas supply unit  290 . 
     Further, a second inert gas supply system is mainly configured by the second inert gas supply pipe  298 , the mass flow controller  300  and the valve  301 . The inert gas source  299 , the downstream supply pipe  291  and the upstream supply pipe  293  may be thought to be included in a second inert gas supply unit. 
     Further, the second gas source  294 , the plasma generation unit  297 , the second inert gas supply unit and the gas supply/exhaust structure  280  may be thought to be included in the second gas supply unit. 
     [Second Gas Exhaust Unit] 
     Subsequently, the second gas exhaust unit  310  will be described using  FIG. 11 . The second gas exhaust unit  310  includes the upstream side exhaust pipes  311  connected to the exhaust pipes  284 . The upstream side exhaust pipes  311  are connected to the respective exhaust pipes  284 . To be specific, the exhaust pipe  284   a  is connected to the exhaust pipe  311   a , the exhaust pipe  284   b  is connected to the exhaust pipe  311   b , and the exhaust pipe  284   c  is connected to the exhaust pipe  311   c.    
     The plurality of exhaust pipes  311  are jointed at a confluence part  312 . A downstream side exhaust pipe  313  is connected downstream from the confluence part  312 . A valve  314  acing as an opening/closing valve, an auto pressure controller (APC) valve  315  acting as a pressure regulator (pressure regulation unit) and a pump  316  are disposed at the downstream side exhaust pipe  313  from upstream. 
     Each of the upstream side exhaust pipes  311  is provided with a pressure detector. The pressure detector is used, for instance, as a flow rate detector. The pressure detectors  317  are installed on the respective upstream side exhaust pipes  311 . A pressure detector  317   a  is installed on the upstream side exhaust pipe  311   a , a pressure detector  317   b  is installed on the upstream side exhaust pipe  311   b , and a pressure detector  317   c  is installed on the upstream side exhaust pipe  311   c . The plurality of pressure detectors  317  provided for the second gas exhaust unit are referred to collectively as a second pressure detection unit. The pressure detectors are connected to the controller  400 . A flow rate of each upstream side exhaust pipe  311  is detected by each pressure detector  317 . A detecting method will be described below. 
     The APC valve  315  is an opening/closing valve that can open/close a valve to perform or stop vacuum exhaust in the process room  201  and is also configured to be able to adjust a degree of valve opening to regulate a pressure in the process room  201 . The exhaust unit is mainly configured by the second gas exhaust channel  286 , the upstream side exhaust pipe  311 , the downstream side exhaust pipe  313 , the valve  314  and the APC valve  315 . The flow rate of each upstream side exhaust pipe is detected by each pressure detector  317 . A detecting method will be described below. 
     When the second element-containing gas is used as the reactive gas, the second gas supply/exhaust structure may be referred to as a reactive gas supply/exhaust structure, the second gas supply unit may be referred to as a reactive gas supply unit, and the second gas exhaust unit may be referred to as a reactive gas exhaust unit. Further, in other components, the second gas may be replaced with the reactive gas. 
     [Third Gas Supply Unit] 
     The third gas supply unit  330  will be described using  FIG. 12 . The third gas supply unit  330  functions to supply a gas to the gas supply structure  320 . This will be described below in detail. 
     The third gas supply unit  330  includes a plurality of downstream supply pipes  331 . The downstream supply pipes  331  are connected to the respective gas supply structure  320 . To be specific, the downstream supply pipe  331   a  is connected to the supply pipe  322   a , the downstream supply pipe  331   b  is connected to the supply pipe  322   b , the downstream supply pipe  331   c  is connected to the supply pipe  322   c , the downstream supply pipe  331   d  is connected to the supply pipe  322   d , the downstream supply pipe  331   e  is connected to the supply pipe  322   e , and the downstream supply pipe  331   f  is connected to the supply pipe  322   f.    
     The downstream supply pipes  331  are joined at a confluence part  332 , and are connected to an upstream supply pipe  333 . A third gas source  334  is connected to an upstream end of the supply pipe  333 . A mass flow controller (MFC)  335  acting as a flow rate regulator (flow rate regulation unit) and an opening/closing valve  336  are provided from upstream between the third gas source  334  and the confluence part. 
     A gas containing a third element (hereinafter referred to as “third element-containing gas” or “third gas”) is supplied to the gas supply structure  320  through the upstream supply pipe  333  via the mass flow controller  335  and the valve  336 . 
     Here, an inert gas is mainly used as the third gas. The inert gas is, for instance, nitrogen (N 2 ) gas. As the inert gas, a rare gas such as helium (He) gas, neon (Ne) gas or argon (Ar) gas may be used in addition to the N 2  gas. 
     The downstream supply pipes  331 , the upstream supply pipe  333 , the mass flow controller  335  and the valve  336  are mainly referred to as the third gas supply unit. The third gas source  334  may be thought to be included in the third gas supply unit. 
     When the third element-containing gas is used as the inert gas, the third gas supply structure may be referred to as an inert gas supply structure, and the third gas supply unit may be referred to as an inert gas supply unit. Further, in other components, the third gas may be replaced with the inert gas. 
     [Controller] 
     The substrate processing apparatus  10  includes the controller (control unit)  400  that controls an operation of each unit of the substrate processing apparatus  10 . The controller  400  includes at least an operation unit  401  and a storage unit  402 . The controller  400  is connected to each of the aforementioned components, calls a program or a recipe from the storage unit  402  according to an instruction of the controller or a user, and controls an operation of each component according to contents of the program or the recipe. The controller  400  may be configured as a dedicated computer or a general-purpose computer. For example, an external storage device  403  in which the aforementioned program is stored (for instance, a magnetic tape, a magnetic disk such as a flexible disk or a hard disk, an optical disk such as a compact disc (CD) or a digital versatile disc (DVD), a magneto-optical (MO) disc or a semiconductor memory such as a universal serial bus (USB) memory (USB flash drive) or a memory card) is prepared, and the program is installed in the general-purpose computer using the external storage device  403 . Thereby, the controller  400  according to the present embodiment may be configured. Further, a means for supplying the program to the computer is not limited to supplying the program via the external storage device  403 . For example, the program may be supplied using a telecommunication means such as the Internet or a private line without the external storage device  403 . The storage unit  402  or the external storage device  403  is configured as a computer readable recording medium. Hereinafter, these are referred to collectively simply as a recording medium. The term recording medium used herein may include only the storage unit  402 , only the external storage device  403 , or both of these. 
     [Process of Processing Substrate] 
     Subsequently, as one process of a method of manufacturing a semiconductor device according to the present embodiment, a process of processing a substrate using the aforementioned substrate processing apparatus having the process chamber  202  will be described. 
     First, an outline of the process of processing the substrate will be described using  FIGS. 13 and 14 .  FIG. 13  is a flowchart illustrating the process of processing the substrate.  FIG. 14  is a flowchart of a film forming process according to the present embodiment. In the following description, the operation of each constituent unit of the process chamber  202  of the substrate processing apparatus  10  is controlled by the controller  400 . 
     Here, an example in which a titanium nitride film is formed on the wafer  200  as a thin film using a TiCl 4  gas as a first element-containing gas and using an ammonia (NH 3 ) gas as a second element-containing gas will be described. Further, a given film may be formed, for instance, on the wafer  200  in advance. Further, a given pattern may be formed on the wafer  200  or the given film. 
     [Substrate Loading and Placing Process S 102 ] 
     For example, the FOUP  100  in which maximum 25 wafers are accommodated is conveyed by the in-process conveyance device, and is placed on the load port  105 . The cap  100   a  of the FOUP  100  is removed by the FOUP opener  108 , and a substrate gate of the FOUP  100  is opened. The second substrate transfer machine  124  picks up the wafer  200  from the FOUP  100 , and place it on the notch alignment device  106 . The notch alignment device  106  positions the wafer  200 . The second substrate transfer machine  124  loads the wafer  200  into the spare chamber  122  under atmospheric pressure from the notch alignment device  106 . The gate valve  128  is closed, and the interior of the spare chamber  122  is exhausted to a negative pressure by an exhaust system (not shown). 
     The susceptor  220  is displaced to and maintained at a conveyance position of the wafer  200 , namely a substrate placement position in the process chamber  202 . In the present embodiment, the susceptor  220  is caused to move down. The downward movement causes the wafer elevation pins  224  to move up in the through-holes  223  of the susceptor  220 . As a result, the wafer elevation pins  224  are kept protruding from the surface of the susceptor  220  by a given height only. Subsequently, a given gate valve is opened, and a given number (e.g., five) of wafers (process substrates)  200  are loaded into the process room  201  using a vacuum conveyance robot  112 . Then, the wafers  200  are placed around the rotary shaft of the susceptor  220  in a rotational direction of the susceptor  220  such that the wafers  200  do not overlap. Thereby the wafers  200  are supported on the wafer elevation pins  224  protruding from the surface of the susceptor  220  in a horizontal posture. 
     When the wafer  200  is loaded into the process room  201 , the first conveyance robot  112  is retreated outside the process chamber  202 , the predetermined gate valve is closed to seal the interior of the reaction vessel  203 . Afterwards, the susceptor  220  is displaced to and maintained at the substrate processing position. In the present embodiment, the susceptor  220  is caused to move up. The upward movement of the susceptor  220  causes the wafer  200  to be placed on each wafer placement unit  221  provided for the susceptor  220 . 
     When the wafer  200  is loaded into the process room  201 , a N 2  gas used as an inert gas is preferably supplied into the process room  201  by the third gas supply unit while the interior of the process room  201  is exhausted by the first gas exhaust unit  270  and the second gas exhaust unit  310 . That is, in a state in which the interior of the process room  201  is exhausted by operating the pump  276  and the pump  316  and opening the APC valve  275  and the APC valve  315 , the N 2  gas is preferably supplied into the process room  201  by at least opening the valve  274  and the valve  314 . Thereby, it is possible to inhibit particles from intruding into the process room  201  or from being attached onto the wafer  200 . Further, the pump  276  and the pump  316  are at least kept operated normally until the substrate loading and placing process S 102  to a substrate unloading process S 106  to be described below are completed. 
     When the wafer  200  is placed on the susceptor  220 , power is supplied to the heater  228  embedded in the susceptor  220 , and the surface of the wafer  200  is controlled to reach a predetermined temperature. The temperature of the wafer  200  is for instance room temperature or more and 700° C. or less, and preferably room temperature or more and 500° C. or less. At this time, a temperature of the heater  228  is adjusted by controlling an electrical conduction to the heater  228  based on information about a temperature detected by the temperature sensor  227 . 
     When the surface temperature of the wafer  200  is heated to 750° C. or more in a process of heating the wafer  200  formed of silicon, diffusion of impurities may occur in a source or drain region formed on the surface of the wafer  200 . Accordingly, circuit characteristics may be deteriorated, and performance of a semiconductor device may be reduced. By restricting the temperature of the wafer  200  as described above, it is possible to inhibit the diffusion of the impurities into the source or drain region formed on the surface of the wafer  200 , the deterioration of the circuit characteristics, and the reduction in the performance of the semiconductor device. 
     [Thin Film Forming Process S 104 ] 
     Next, a thin film forming process S 104  is performed. Here, a basic flow of the thin film forming process S 104  will be described, and characteristic portions of the present embodiment will be described below in detail. 
     In the thin film forming process S 104 , a TiCl 4  gas is supplied by a first gas supply structure  241   a , a first gas supply structure  241   b  and a first gas supply structure  241   c , and an ammonia gas of a plasma state is supplied by a second gas supply structure  281   a , a second gas supply structure  281   b  and a second gas supply structure  281   c . Accordingly, a titanium nitride (TiN) film is formed on the wafer  200 . 
     In the thin film forming process S 104 , the interior of the process room  201  is continuously exhausted by the first gas exhaust unit  270  and the second gas exhaust unit  310  even after the substrate loading and placing process S 102 . In conjunction with this, the N 2  gas used as the inert gas are supplied by a third gas supply structure  321   a , a third gas supply structure  321   b , a third gas supply structure  321   c , a third gas supply structure  321   d , a third gas supply structure  321   e  and a third gas supply structure  321   f.    
     [Start to Rotate Susceptor S 202 ] 
     Subsequently, details of the thin film forming process S 104  will be described using  FIG. 14 . First, when the wafers  200  are placed on the respective wafer placement units  221 , the susceptor  220  starts to be rotated by the rotary mechanism  225 . At this time, a speed of rotation of the susceptor  220  is controlled by the controller  400 . The rotation speed of the susceptor  220  is for instance one rotation per minute or more and 100 rotations per minute or less. In detail, the rotation speed is for instance 60 rotations per minute. By rotating the susceptor  220 , the surface of the susceptor  220  and the wafer  200  start to move in regions below the gas supply/exhaust structure  240  and the gas supply/exhaust structure  280 . Together with the rotation start, the pressure detector  277   a , the pressure detector  277   b  and the pressure detector  277   c  are operated. 
     [Start Supply of Gas S 204 ] 
     When the wafer  200  is heated to reach a desired temperature and the susceptor  220  reaches a desired rotation speed, the TiCl 4  gas starts to be supplied by the gas supply structure  241   a , the gas supply structure  241   b  and the gas supply structure  241   c . In conjunction with this, the ammonia gas of the plasma state is supplied by the gas supply structure  281   a , the gas supply structure  281   b  and the gas supply structure  281   c.    
     At this time, the mass flow controller  255  is adjusted such that a flow rate of the TiCl 4  gas reaches a predetermined flow rate. Further, the flow rate of supply of the TiCl 4  gas is for instance 100 sccm or more and 5,000 sccm or less. Together with the TiCl 4  gas, the N 2  gas may be supplied as a carrier gas. 
     The mass flow controller  295  is adjusted such that a flow rate of the ammonia gas becomes a predetermined flow rate. The flow rate of the supplied ammonia gas is for instance 100 sccm or more and 5,000 sccm or less. Together with the ammonia gas, the N 2  gas may be supplied as the carrier gas. 
     Further, the degrees of opening of the APC valve  275  and the APC valve  315  are properly adjusted, and thereby a pressure in the process room  201  including the region below each gas supply/exhaust structure is set to a predetermined pressure. 
     A titanium-containing layer having a predetermined thickness starts to be formed on the surface of the wafer  200  or the susceptor from the process of starting the supply of the gas S 204 . 
     [Film Forming Process S 206 ] 
     Next, a film forming process to be described below is performed by rotating the susceptor  220  a predetermined number of times. At this time, since the surfaces of the wafer  200  and the susceptor  220  are exposed to the gas, a film is formed on the wafer  200 , and simultaneously a film is formed on the surface of the susceptor  220 . 
     Further, a flow of the gas or atmosphere is formed in the film forming process as follows. In the region below the first gas supply/exhaust structure  240   a , the first gas supplied by the first gas supply structure  241   a  forms a titanium-containing layer on the wafer  200 , and then is exhausted by a first gas exhaust structure  243   a . This is true of the first gas supply/exhaust structure  240   b  and the first gas supply/exhaust structure  240   c.    
     Further, in the region below the second gas supply/exhaust structure  280   a , the second gas supplied by the second gas supply structure  281   a  reacts with the titanium-containing layer on the wafer  200 , and then is exhausted by a second gas exhaust structure  283   a . This is true to the second gas supply/exhaust structure  280   b  and the second gas supply/exhaust structure  280   c.    
     Further, the third gas supplied by the third gas supply structure  320   a  extrudes (removes) a remaining gas on the wafer  200  passing through the region below the third gas supply structure  320   a , and then is exhausted along with the remaining gas component by the first gas exhaust structure  243   a  or the second gas exhaust structure  283   a . This is same to the third gas supply structure  320   b  and the third gas supply structure  320   c.    
     Here, details of the film forming process S 206  will be described using  FIG. 15 . 
     [Passing Through Region Below First Gas Supply/Exhaust Structure (S 302 )] 
     When the wafer  200  passes through the region below the first gas supply/exhaust structure  240 , the TiCl 4  gas is supplied to the wafer  200 . The TiCl 4  gas comes into contact with the surface of the wafer  200 , and thereby a titanium-containing layer is formed as a “first element-containing layer.” The first gas supplied onto the wafer  200  is exhausted via the gas exhaust structure  243 , and an exhausted flow rate is detected by the pressure detector  277 . 
     The titanium-containing layer is formed at a predetermined thickness and with a predetermined distribution, for instance, according to a pressure of the region blow the first gas supply/exhaust structure  240 , a pressure in the process room  201 , a flow rate of the TiCl 4  gas, a temperature of the susceptor  220 , a time required to pass through the region below the first gas supply structure (processing time in the region below the first gas supply structure), and so on. 
     [Passing Through Region Below Inert Gas Supply Structure (S 304 )] 
     Next, after the wafer  200  passes through the region below the first gas supply/exhaust structure  240 , the wafer  200  moves in a rotational direction R of the susceptor  220  and to the region below the inert gas supply structure  320 . When the wafer  200  passes through the region below the inert gas supply structure  320 , a titanium component not bonded to the wafer  200  in the region below of the first gas supply/exhaust structure  240  is removed from the wafer  200 . 
     [Passing Through Region Below Second Gas Supply/Exhaust Structure (S 306 )] 
     Next, after the wafer  200  passes through the region below the inert gas supply structure  320 , the wafer  200  moves in the rotational direction R of the susceptor  220  and to the region below the second gas supply/exhaust structure  280 . When the wafer  200  passes through the region below the second gas supply/exhaust structure  280 , the titanium-containing layer and the ammonia gas react to form a titanium nitride layer in the region below the second gas supply/exhaust structure  280 . The second gas supplied onto the wafer  200  is exhausted via the second gas exhaust structure  283 , and an exhausted flow rate is detected by the pressure detector  317 . 
     [Passing Through Region Below Inert Gas Supply Structure (S 308 )] 
     Next, after the wafer  200  passes through the region below the second gas supply/exhaust structure  280 , the wafer  200  moves in the rotational direction R of the susceptor  220  and to the region below the inert gas supply structure  320 . When the wafer  200  passes through the region below the inert gas supply structure  320 , a nitrogen component failing to react with the titanium-containing layer of the wafer  200  in the region below the second gas supply/exhaust structure  280  is removed from the wafer  200  by the inert gas. 
     [Decision S 310 ] 
     In the meantime, the controller  400  decides whether to perform one cycle a predetermined number of times. In detail, the controller  400  counts the number of revolutions of the susceptor  220 . 
     When one cycle is not performed a predetermined number of times (No in S 310 ), the rotation of the susceptor  220  continues to repeat the cycle of the passing through the region below the first gas supply/exhaust structure (S 302 ), the passing through the region below the inert gas supply structure (S 304 ), the passing through the region below the second gas supply/exhaust structure (S 306 ) and the passing through the region below the inert gas supply structure (S 308 ). When one cycle is performed a predetermined number of times (Yes in S 310 ), the film forming process S 206  is terminated. 
     Subsequently, an operation of the pressure detection unit in the film forming process S 206  will be described. When a combination of the first gas supply/exhaust structure  240  and the second gas supply/exhaust structure  280  is increased to realize high throughput, a distance between the neighboring supply/exhaust structures may be reduced and the gases may be mixed. 
     When the distance between the neighboring first and second gas supply structures  241  and  281  is reduced, the exhaust of the first gas or the second gas may become insufficient. Therefore, the first gas and the second gas may be mixed in the process chamber, the exhaust channel or the exhaust pipe. In this case, the first gas and the second gas are introduced into the first gas exhaust channel  246  or the second gas exhaust channel  286 , a chemical vapor deposition (CVD) reaction occurs in the gas exhaust channel or in the exhaust pipe, and a film is attached to a wall surface. When an amount of attachment is increased, abnormality such as clogging of the gas exhaust channel or the exhaust pipe is caused. Since an exhausted flow rate becomes insufficient due to the clogging, process conditions such as a flow velocity or pressure are changed compared to the regions (spaces) below the other gas supply/exhaust structures. Thus, characteristics of the film formed in each of the regions (spaces) below the gas supply/exhaust structures may be changed and lead to reduction in yield. 
     Thus, in the present embodiment, the abnormal state of the gas exhaust channel or the exhaust pipe is detected to make the process conditions equal to the other region in which the same gas is supplied. Hereinafter, details will be described giving the first gas exhaust unit  270  by way of example. 
     The first gas exhaust unit  270  exhausts an atmosphere of the region (space) below the gas supply/exhaust structure  240   a  via a gas exhaust channel  246   a  and the exhaust pipe  244   a . The exhaust pipe  244   a  is connected to the upstream side exhaust pipe  271   a , and the pressure detector  277   a  detects a pressure P 11   a  when the atmosphere passes through the exhaust pipe  271   a . Similarly, an atmosphere of the region below the gas supply/exhaust structure  240   b  is exhausted through the exhaust pipe  271   b , and the pressure detector  277   b  detects a pressure P 11   b . Further, an atmosphere of the region below the gas supply/exhaust structure  240   c  is exhausted through the exhaust pipe  271   c , and the pressure detector  277   c  detects a pressure P 11   c.    
     Pressure data detected by each of the pressure detector  277   a , the pressure detector  277   b  and the pressure detector  277   c  is sent to the controller  400 . The controller  400  compares a value detected by each pressure detection unit with pressure data previously recorded in the storage unit. 
     As previously stored pressure data, for example, three-stage pressure data α 1 , β 1  and γ 1  are stored. A relation between these is α 1 &lt;β 1 &lt;γ 1 . α 1  is the upper limit of a typical pressure value for forming a film on the wafer  200  using a first gas. When the detected pressure value is lower than α 1 , the detected pressure is regarded as a typical pressure range. When the detected pressure value is β 1 , the detected pressure is a pressure that has no influence on a film quality of the wafer, but it is regarded as a pressure higher than the typical pressure α 1 . When the pressure value is β 1 , the controller  400  continues processing together with informing a user of a warning on an attached display screen. The apparatus is stopped before wafers of the next lot are processed. During the stop of the apparatus, maintenance, for instance, exchanging the exhaust pipe from which a high pressure value is detected is performed. γ 1  is a pressure value that influences the wafer processing. When the pressure value is γ 1 , it is determined that this exceeds a level at which the pipe has an influence on the film quality, and the apparatus is immediately stopped without waiting for the next lot. The immediate stop inhibits the gas from being introduced into the other pipes. 
     Similar to the second gas exhaust unit  310 , an atmosphere of the region below the gas supply/exhaust structure  280   a  is exhausted via the exhaust pipe  311   a . Along with this, the pressure detector  317   a  detects a pressure P 21   a  when the atmosphere passes through the exhaust pipe  311   a . Further, an atmosphere of the region below the gas supply/exhaust structure  280   b  is exhausted from the exhaust pipe  311   b . Along with this, the pressure detector  317   b  detects a pressure P 21   b . An atmosphere of the region below the gas supply/exhaust structure  280   c  is exhausted from the exhaust pipe  311   c . Along with this, the pressure detector  317   c  detects a pressure P 21   c.    
     Pressure data detected by each of the pressure detector  317   a , the pressure detector  317   b  and the pressure detector  317   c  is sent to the controller  400 . The controller  400  compares a value detected by each pressure detection unit with pressure data previously recorded in the storage unit. 
     As previously stored pressure data, for example, three-stage pressure data α 2 , β 2  and γ 2  are stored. A relation between these is α 2 &lt;β 2 &lt;γ 2 . α 2  is the upper limit of a typical pressure value for reacting a second gas on the wafer. When the first gas is a source gas and the second gas is a reactive gas, α 2  is preferably a value higher than α 1  in order to increase reaction efficiency of the reactive gas with respect to the first element-containing layer. When the detected pressure value is lower than α 2 , the detected pressure is regarded as a typical pressure range. β 2  is higher than α 2 , and is lower than γ 2 . The pressure value β 2  is a pressure that has no influence on a film quality of the wafer, but it is regarded as a pressure value high than the typical pressure α 2 . When the pressure value is β 2 , the controller  400  continues processing together with informing a user of a warning on an attached display screen. The apparatus is stopped before wafers of the next lot are processed. During the stop of the apparatus, maintenance, for instance, exchanging the exhaust pipe from which a high pressure value is detected is performed. When the detected pressure value is above γ 2 , it is determined that a state of the pipe exceeds a level at which the pipe has an influence on the film quality, and the apparatus is immediately stopped without waiting for the next lot. The immediate stop inhibits the gas from being introduced into the other pipes. 
     [Stop Supplying Gas (S 208 )] 
     After the film forming process S 206 , the valve  256  is at least closed, and supply of the first element-containing gas is stopped. In conjunction with this, the valve  296  is closed, and supply of the second element-containing gas is stopped. 
     [Stop Rotating Susceptor (S 210 )] 
     After the gas supply is stopped (S 208 ), the rotation of the susceptor  220  is stopped. Thereby, the thin film forming process S 104  is terminated. 
     [Substrate Unloading Process S 106 ] 
     Next, the susceptor  220  is lowered to support the wafer  200  on the wafer elevation pins  224  protruding from the surface of the susceptor  220 . Afterwards, a predetermined gate valve is opened, and the wafer  200  is unloaded outside the reaction vessel  203  using the first conveyance robot  112 . Afterwards, when the process of processing the substrate is terminated, supply of the inert gas into the process room  201  through the inert gas supply system is stopped. 
     With the configuration as described above, it can be reliably detected whether the exhaust pipes corresponding to the first gas supply/exhaust structure  240   a , the first gas supply/exhaust structure  240   b  and the first gas supply/exhaust structure  240   c  are in an abnormal state. Thus, the pressure conditions of the region below the first gas supply/exhaust structure  240   a , the region below the first gas supply/exhaust structure  240   b  and the region below the first gas supply/exhaust structure  240   c  can be maintained within a constant range. 
     Further, it can be reliably detected whether the exhaust pipes corresponding to the second gas supply/exhaust structure  280   a , the second gas supply/exhaust structure  280   b  and the second gas supply/exhaust structure  280   c  are in an abnormal state. Thus, the pressure conditions of the region below the second gas supply/exhaust structure  280   a , the region below the second gas supply/exhaust structure  280   b  and the region below the second gas supply/exhaust structure  280   c  can be maintained within a constant range. 
     Furthermore, since the pressure conditions of the region below each of the first gas supply/exhaust structures  240  and the region below each of the second gas supply/exhaust structures  280  can be maintained within a constant range, the characteristics of the layer in the thickness direction of the layer can be made uniform, and the yield can be improved. 
     Further, when the process continues in the abnormal state such as clogging, it is thought that the gas flows back into the neighboring exhaust channel or exhaust pipe and the abnormal state further occurs. However, in the present embodiment, such a situation can be prevented. For example, when the first gas and the second gas are mixed in the region below the second gas supply/exhaust structure  280   a  and the clogging occurs in the exhaust pipe  284 , the first and second gases originally to be exhausted move to the region below the neighboring first gas supply/exhaust structure  240   a  or first gas supply/exhaust structure  240   b . The moving first and second gases flow into the exhaust pipes of the respective gases, and the film is attached to the gas exhaust channel or the exhaust pipe. When an amount of attachment is increased, the clogging occurs in the gas exhaust channel or the exhaust pipe. When the clogging occurs at one gas supply/exhaust structure in this way, the clogging occurs at the neighboring supply/exhaust structure. As a result, particles occur in the process room  201 . In the present embodiment, this situation can be prevented. 
     Further, in the present embodiment, a more remarkable effect is exerted when a liquid raw material is used as the first gas. Hereinafter, when the liquid raw material is used, the gas supply/exhaust structure and the reason why the remarkable effect is exerted will be described. 
     When the liquid raw material is used, a first gas exhaust structure  240 ′ as in  FIG. 16  is used in place of the first gas supply/exhaust structure  240  illustrated in  FIGS. 4 and 6 . The first gas exhaust structure  240 ′ is different from those of  FIGS. 4 and 6  in that a heater  245 ′ acting as a temperature controller is provided around the supply pipe  242 . 
     The first gas that is the liquid raw material is supplied to the supply pipe  242  of the first gas exhaust structure  240 ′. The liquid raw material is not liquefied at the supply pipe  242  again, and is heated to maintain a gas state by the heater  245 ′. 
     The liquid source gas supplied through the gas supply channel  245  forms a film on the wafer  200 . The liquid source gas having contributed to the film formation is exhausted via the exhaust channel  246 , the exhaust pipe  244  and the exhaust pipe  271 , but the exhaust pipe  244  or the exhaust pipe  271  is not heated and thus has a low temperature compared to the supply pipe. For this reason, the gas is thought to be liquefied again. The liquid raw material liquefied again may be attached to the exhaust pipe  244  and the exhaust pipe  271 , and cause pipe abnormality such as clogging. 
     In the present embodiment, the pipe abnormality can be reliably detected with respect to this situation. Thus, even when the liquid raw material requiring delicate temperature control is used, it is possible to prevent a reduction in operation efficiency. 
     Second Embodiment of the Present Invention 
     Subsequently, a second embodiment will be described. In the second embodiment, the exhaust unit  270  of the first embodiment is replaced with an exhaust unit  270 ′, and the exhaust unit  310  of the first embodiment is replaced with an exhaust unit  310 ′. As illustrated in  FIG. 17 , the exhaust unit  270 ′ has a valve  278   a , a valve  278   b , a valve  278   c  and a pressure detector  279  that are added to the components of the exhaust unit  270 . As illustrated in  FIG. 18 , the exhaust unit  310 ′ has a valve  318   a , a valve  318   b , a valve  318   c  and a pressure detector  319  that are added to the components of the exhaust unit  310 . 
     Subsequently, a method of detecting abnormality of the pipe will be described. The abnormality mentioned herein refers to, for instance, clogging of the pipe as in the first embodiment. An abnormality detecting process of the present embodiment is performed in a maintenance process to be described below after the process of  FIG. 13  is terminated. 
     [Maintenance Process] 
     In the maintenance process, abnormality of the exhaust pipe is detected. First, a method of detecting abnormality of the exhaust unit  270 ′ will be described. After the substrate processing is terminated, the valve  278   a  is set to be opened, and the valve  278   b  and the valve  278   c  are set to be closed. In conjunction with this, the valve  318   a , the valve  318   b  and the valve  318   c  are set to be closed. 
     Thereafter, an inert gas is supplied to the process chamber through a gas supply channel  245   a , and the supplied gas is exhausted via a gas exhaust channel  246   a  and an exhaust pipe  271   a . When the gas is exhausted, a pressure of the exhaust pipe  271   a  is detected by a pressure detection unit  277   a . Further, a pressure of an exhaust pipe  273  is detected by a pressure detection unit  279 . Each of the detected pressure data is sent to a controller  400 . A difference ΔP 1   a  between a value of the pressure detected by the pressure detection unit  277   a  and a value of the pressure detected by the pressure detection unit  279  is calculated at the controller  400 . The calculated data is compared with pre-stored pressure data for maintenance. The pressure data for maintenance includes, for instance, an upper limit α 3   a  of a processible state and β 3   a  of an abnormal state. When ΔP 1   a  is within a range of α 3   a , this is determined to be in a wafer processible state. When ΔP 1   a  is within a range of β 3   a , this is determined to be in an abnormal state, and maintenance such as exchanging or cleaning of the pipe is performed. 
     Next, the valve  278   a  and the valve  278   c  are set to be closed, and the valve  278   b  is set to be opened. Thereafter, an inert gas is supplied to the process chamber through a gas supply channel  245   b , and the supplied gas is exhausted via a gas exhaust channel  246   b  and an exhaust pipe  271   b . When the gas is exhausted, a pressure of the exhaust pipe  271   b  is detected by a pressure detection unit  277   b . Further, the pressure of the exhaust pipe  273  is detected by the pressure detection unit  279 . Each of the detected pressure data is sent to the controller  400 . A difference ΔP 1   b  between a value of the pressure detected by the pressure detection unit  277   b  and a value of the pressure detected by the pressure detection unit  279  is calculated at the controller  400 . The calculated data is compared with pre-stored pressure data for maintenance. The pressure data for maintenance includes, for instance, an upper limit α 3   b  of a processible state and β 3   b  of an abnormal state. When ΔP 1   b  is within a range of α 3   b , this is determined to be in a wafer processible state. When ΔP 1   b  is within a range of β 3   b , this is determined to be in an abnormal state, and maintenance such as exchanging or cleaning of the pipe is performed. 
     Next, the valve  278   a  and the valve  278   b  are set to be closed, and the valve  278   c  is set to be opened. Thereafter, an inert gas is supplied to the process chamber through a gas supply channel  245   c , and the supplied gas is exhausted via a gas exhaust channel  246   c  and an exhaust pipe  271   c . When the gas is exhausted, a pressure of the exhaust pipe  271   c  is detected by a pressure detection unit  277   c . Further, the pressure of the exhaust pipe  273  is detected by the pressure detection unit  279 . Each of the detected pressure data is sent to the controller  400 . A difference ΔP 1   c  between a value of the pressure detected by the pressure detection unit  277   c  and a value of the pressure detected by the pressure detection unit  279  is calculated at the controller  400 . The calculated data is compared with pre-stored pressure data for maintenance. The pressure data for maintenance includes, for instance, an upper limit α 3   c  of a processible state and β 3   c  of an abnormal state. When ΔP 1   c  is within a range of α 3   c , this is determined to be in a wafer processible state. When ΔP 1   c  is within a range of β 3   c , this is determined to be in an abnormal state, and maintenance such as exchanging or cleaning of the pipe is performed. 
     The abnormality of the exhaust unit  270 ′ is detected by the method as described above. 
     Next, a method of detecting abnormality of the exhaust unit  310 ′ will be described. After the abnormality detection of the exhaust unit  270 ′ is terminated, the valve  278   a , the valve  278   b  and the valve  278   c  are set to be closed. In conjunction with this, the valve  318   a  is set to be opened, and the valve  318   b  and the valve  318   c  are set to be closed. 
     Thereafter, an inert gas is supplied to the process chamber through a gas supply channel  285   a , and the supplied gas is exhausted via a gas exhaust channel  286   a  and an exhaust pipe  311   a . When the gas is exhausted, a pressure of the exhaust pipe  311   a  is detected by a pressure detection unit  317   a . Further, a pressure of an exhaust pipe  313  is detected by a pressure detection unit  319 . Each of the detected pressure data is sent to the controller  400 . A difference ΔP 2   a  between a value of the pressure detected by the pressure detection unit  317   a  and a value of the pressure detected by the pressure detection unit  319  is calculated at the controller  400 . The calculated data is compared with pre-stored pressure data for maintenance. The pressure data for maintenance includes, for instance, an upper limit α 4   a  of a processible state and β 4   a  of an abnormal state. When ΔP 2   a  is within a range of α 4   a , this is determined to be in a wafer processible state. When ΔP 2   a  is within a range of β 4   a , this is determined to be in an abnormal state, and maintenance such as exchanging or cleaning of the pipe is performed. 
     Next, the valve  318   a  and the valve  318   c  are set to be closed, and the valve  318   b  is set to be opened. Thereafter, an inert gas is supplied to the process chamber through a gas supply channel  285 , and the supplied gas is exhausted via a gas exhaust channel  286   b  and an exhaust pipe  311   b . When the gas is exhausted, a pressure of the exhaust pipe  311   b  is detected by a pressure detection unit  317   b . Further, the pressure of the exhaust pipe  273  is detected by the pressure detection unit  319 . Each of the detected pressure data is sent to the controller  400 . A difference ΔP 2   b  between a value of the pressure detected by the pressure detection unit  317   b  and a value of the pressure detected by the pressure detection unit  319  is calculated at the controller  400 . The calculated data is compared with pre-stored pressure data for maintenance. The pressure data for maintenance includes, for instance, an upper limit α 4   b  of a processible state and β 4   b  of an abnormal state. When ΔP 2   b  is within a range of α 4   b , this is determined to be in a wafer processible state. When ΔP 2   b  is within a range of β 4   b , this is determined to be in an abnormal state, and maintenance such as exchanging or cleaning of the pipe is performed. 
     Next, the valve  318   a  and the valve  318   b  are set to be closed, and the valve  318   c  is set to be opened. Thereafter, an inert gas is supplied to the process chamber through a gas supply channel  285 , and the supplied gas is exhausted via a gas exhaust channel  286   c  and an exhaust pipe  311   c . When the gas is exhausted, a pressure of the exhaust pipe  311   c  is detected by a pressure detection unit  317   c . Further, the pressure of the exhaust pipe  313  is detected by the pressure detection unit  319 . Each of the detected pressure data is sent to the controller  400 . A difference ΔP 2   c  between a value of the pressure detected by the pressure detection unit  317   c  and a value of the pressure detected by the pressure detection unit  319  is calculated at the controller  400 . The calculated data is compared with pre-stored pressure data for maintenance. The pressure data for maintenance includes, for instance, an upper limit α 4   c  of a processible state and β 4   c  of an abnormal state. When ΔP 2   c  is within a range of α 4   c , this is determined to be in a wafer processible state. When ΔP 2   c  is within a range of β 4   c , this is determined to be in an abnormal state, and maintenance such as exchanging or cleaning of the pipe is performed. 
     The abnormality of the exhaust unit  310 ′ is detected by the method as described above. 
     In this way, the pressure is detected at each of the upstream side exhaust pipe  271  and the downstream side exhaust pipe  273 , and thereby the abnormality can be discovered upstream as well as downstream from the pressure detector  277 . 
     Further, since the abnormality can be discovered at each of the upstream side exhaust pipe  271   a , the upstream side exhaust pipe  271   b  and the upstream side exhaust pipe  271   c , it is possible to increase maintenance efficiency. 
     Other Embodiments of the Present Invention 
     Although the embodiments of the present invention have been described, the present invention is not limited to each of the aforementioned embodiments. 
     Further, for example, in each of the aforementioned embodiments, the structure in which relative positions of each wafer  200  on the susceptor  220  and each gas supply structure are displaced by rotating the susceptor  220  is given as an example, but the present invention is not limited thereto. That is, in the present invention, as long as the relative positions of each wafer on the substrate support table  220  and each gas supply structure are displaced, the rotary drive system described in each embodiment is not necessarily employed. For example, the ceiling of the process chamber in which the gas supply structures are fixed may be rotated. 
     Further, for example, in each of the aforementioned embodiments, the example in which, as the film forming process which the substrate processing apparatus performs, the TiCl 4  gas is used as the source gas (first process gas), the NH 3  gas is used as the reactive gas (second process gas), and these gases are alternately supplied to form the TiN film on the wafer W is given, the present invention is not limited thereto. That is, the process gas used for the film forming process is not limited to the TiCl 4  gas or the NH 3  gas, and another type of thin film may be formed using another type of gas. Further, even when three or more process gases are used, the present invention may be applied as long as the process gases are alternately supplied to perform the film forming process. 
     Further, in the above embodiments, the process conditions are described to be the same. This consequently refers to conditions on which the characteristics of the substrate are within a desired range. Thus, the meaning that the process conditions are set to be the same indicates a range of the conditions on which the characteristics of the substrate are within a desired range. 
     Further, for example, in each of the aforementioned embodiments, as the process which the substrate processing apparatus performs, the film forming process is given as an example, but the present invention is not limited thereto. That is, in addition to the film forming process, a process of forming an oxide film or a nitride film, or a process of forming a film including a metal may be used. Further, the details of the process of processing the substrate are not restricted at all, and may be properly applied to the film forming process as well as another process of processing the substrate such as an annealing process, an oxidizing process, a nitriding process, a diffusing process or a lithography process. Further, the present invention may be properly applied to another substrate processing apparatus, for instance, an annealing apparatus, an oxidizing apparatus, a nitriding apparatus, an exposing apparatus, a coating apparatus, a drying apparatus, a heating apparatus or a processing apparatus using plasma. Further, in the present invention, these apparatuses may be mixed. Further, some of the components of any embodiment may be substituted with the components of the other embodiment. Further, the components of the other embodiment may be added to the components of any embodiment. Further, the other components may be added, deleted, or substituted with respect to some of the components of each embodiment. 
     According to the present invention, it is possible to inhibit a film having inconsistent characteristics from being formed to process a substrate at a high yield. 
     Preferred Embodiments of the Present Invention 
     Hereinafter, preferred embodiments according to the present invention are supplementarily noted. 
     &lt;Supplementary Note 1&gt; 
     According to an aspect of the present invention, there is provided a substrate processing apparatus including: 
     a process chamber; 
     a substrate support table disposed in the process chamber, the substrate support table including circumferentially arranged substrate placement units; 
     a rotation unit configured to rotate the substrate support table; 
     a plurality of source gas supply structures circumferentially arranged above the substrate support table; 
     a source gas supply unit configured to supply a source gas to a region below the plurality of source gas supply structures via the plurality of source gas supply structures; 
     a plurality of source gas exhaust structures configured to exhaust an atmosphere of the region below the plurality of source gas supply structures, wherein each source gas exhaust structure corresponds to each source gas supply structure; 
     a plurality of source gas exhaust pipes connected to the plurality of source gas exhaust structures, wherein each source gas exhaust pipe is connected to each source gas exhaust structure; 
     a source gas exhaust unit configured to exhaust an atmosphere of the process chamber via the plurality of source gas exhaust structures; 
     a plurality of reactive gas supply structures disposed between the plurality of source gas supply structures above the substrate support table; 
     a reactive gas supply unit configured to supply a reactive gas to a region below the plurality of reactive gas supply structures via the plurality of reactive gas supply structures; 
     a plurality of reactive gas exhaust structures configured to exhaust an atmosphere of the region below the plurality of reactive gas supply structures, wherein each reactive gas exhaust structure corresponds to each reactive gas supply structure; 
     a plurality of reactive gas exhaust pipes connected to the plurality of reactive gas exhaust structures, wherein each reactive gas exhaust pipe is connected to each reactive gas exhaust structure; 
     a reactive gas exhaust unit configured to exhaust the atmosphere of the process chamber via the plurality of reactive gas exhaust structures; 
     a plurality of reactive gas pressure detectors installed at the plurality of reactive gas exhaust pipes; and 
     a controller configured to control at least the source gas supply unit, the source gas exhaust unit, the reactive gas supply unit, the reactive gas exhaust unit and the plurality of reactive gas pressure detectors. 
     &lt;Supplementary Note 2&gt; 
     In the substrate processing apparatus of Supplementary note 1, preferably, further including a plurality of source gas pressure detectors installed at the plurality of source gas exhaust pipes. 
     &lt;Supplementary Note 3&gt; 
     In the substrate processing apparatus of any one of Supplementary notes 1 and 2, preferably, the controller is configured to determine at least one of the plurality of reactive gas exhaust pipes as abnormal when pressure of the at least one of the plurality of reactive gas exhaust pipes detected by the plurality of reactive gas pressure detector is higher than a predetermined value. 
     &lt;Supplementary Note 4&gt; 
     In the substrate processing apparatus of any one of Supplementary notes 2 and 3, preferably, the controller is configured to determine at least one of the plurality of source gas exhaust pipes as abnormal when pressure of the at least one of the plurality of source gas exhaust pipes detected by the plurality of source gas pressure detector is higher than a predetermined value. 
     &lt;Supplementary Note 5&gt; 
     In the substrate processing apparatus of any one of Supplementary notes 1 through 4, preferably, further including: 
     a first confluence part where the plurality of reactive gas exhaust pipes are joined; 
     a reactive gas confluence pipe connected to a downstream side of the first confluence part; and 
     a reactive gas confluence pipe pressure detector installed at the reactive gas confluence pipe. 
     &lt;Supplementary Note 6&gt; 
     In the substrate processing apparatus of Supplementary note 5, preferably, further including a first valve installed between the plurality of reactive gas pressure detectors and the first confluence part. 
     &lt;Supplementary Note 7&gt; 
     In the substrate processing apparatus of any one of Supplementary notes 2 through 6, preferably, further including: 
     a second confluence part where the plurality of source gas exhaust pipes are joined; 
     a source gas confluence pipe connected to a downstream side of the second confluence part; and 
     a source gas confluence pipe pressure detector installed at the source gas confluence pipe. 
     &lt;Supplementary Note 8&gt; 
     In the substrate processing apparatus of Supplementary note 7, preferably, further including a second valve installed between the plurality of source gas pressure detectors and the second confluence part. 
     &lt;Supplementary Note 9&gt; 
     According to another aspect of the present invention, preferably, there is provided a method of manufacturing s semiconductor device including: 
     a) loading a plurality of substrates into a process chamber and circumferentially arranging the plurality of substrates on a substrate support table accommodated in the process chamber; 
     b) rotating the substrate support table; 
     c) supplying a source gas to a region below a plurality of source gas supply structures via the plurality of source gas supply structures, and exhausting an atmosphere of the region below the plurality of source gas supply structures, wherein each source gas exhaust structure corresponds to each source gas supply structure; and 
     d) supplying a reactive gas to a region below a plurality of reactive gas supply structures via the plurality of reactive gas supply structures, and exhausting an atmosphere of the region below the plurality of reactive gas supply structures while performing c, wherein each reactive gas exhaust structure corresponds to each reactive gas supply structure, 
     wherein pressures of a plurality of reactive gas exhaust pipes, wherein each reactive gas exhaust pipe is connected to each reactive gas exhaust structure, are detected in d). 
     &lt;Supplementary Note 10&gt; 
     According to still another aspect of the present invention, preferably, there is provided a program executed in a substrate processing apparatus, the program causing the substrate processing apparatus to perform: 
     a) loading a plurality of substrates into a process chamber and circumferentially arranging the plurality of substrates on a substrate support table accommodated in the process chamber; 
     b) rotating the substrate support table; 
     c) supplying a source gas to a region below a plurality of source gas supply structures via the plurality of source gas supply structures, and exhausting an atmosphere of the region below the plurality of source gas supply structures, wherein each source gas exhaust structure corresponds to each source gas supply structure; and 
     d) supplying a reactive gas to a region below a plurality of reactive gas supply structures via the plurality of reactive gas supply structures, and exhausting an atmosphere of the region below the plurality of reactive gas supply structures while performing c, wherein each reactive gas exhaust structure corresponds to each reactive gas supply structure, 
     wherein pressures of a plurality of reactive gas exhaust pipes, wherein each reactive gas exhaust pipe is connected to each reactive gas exhaust structure, are detected in d). 
     &lt;Supplementary Note 11&gt; 
     According to still another aspect of the present invention, preferably, there is provided a non-transitory computer-readable recording medium storing a program executed in a substrate processing apparatus, the program causing the substrate processing apparatus to perform: 
     a) loading a plurality of substrates into a process chamber and circumferentially arranging the plurality of substrates on a substrate support table accommodated in the process chamber; 
     b) rotating the substrate support table; 
     c) supplying a source gas to a region below a plurality of source gas supply structures via the plurality of source gas supply structures, and exhausting an atmosphere of the region below the plurality of source gas supply structures, wherein each source gas exhaust structure corresponds to each source gas supply structure; and 
     d) supplying a reactive gas to a region below a plurality of reactive gas supply structures via the plurality of reactive gas supply structures, and exhausting an atmosphere of the region below the plurality of reactive gas supply structures while performing c, wherein each reactive gas exhaust structure corresponds to each reactive gas supply structure, 
     wherein pressures of a plurality of reactive gas exhaust pipes, wherein each reactive gas exhaust pipe is connected to each reactive gas exhaust structure, are detected in d).