Abstract:
A substrate treatment device includes: a treatment chamber in which a substrate is to be placed; a supply system configured to supply at least two kinds of treatment gases into the treatment chamber; an exhaust system having a pump, configured to exhaust the treatment gases from the treatment chamber; and a capturing unit interposed between the treatment chamber and the pump and containing fine grains, configured to capture by the fine grains at least one kind of the treatment gas exhausted from the treatment chamber.

Description:
CROSS-REFERENCE TO THE INVENTION  
         [0001]    This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2002-252273, filed on Aug. 30, 2002; the entire contents of which are incorporated herein by reference.  
         BACKGROUND OF THE INVENTION  
         [0002]    1. Field of the Invention  
           [0003]    The present invention relates to a substrate treatment device that treats a substrate, a substrate treatment method, and a cleaning method for the substrate treatment device.  
           [0004]    2. Description of the Related Art  
           [0005]    In recent years, there have been demands for higher speed and increasing density in manufacturing semiconductor devices. Accordingly, the hole diameter is becoming remarkably smaller, resulting in a higher aspect ratio.  
           [0006]    However, the increase in the aspect ratio tends to lower step coverage of a thin film such as a TiN film and a TiSiN film formed in holes. Such being the case, with the aim of forming thin films excellent in step coverage, a deposition device that forms films while supplying treatment gases alternately has been presently drawing attention.  
           [0007]    In forming the TiN film through the use of TiCl 4  and NH 3  by such a deposition device, however, even when a trap is installed, a large amount of yellow powder adheres to an inner wall of an exhaust pipe that is on a downstream side of the trap, concretely, the inner wall of the exhaust pipe whose inner pressure is maintained at an atmospheric pressure. Incidentally, this trap is intended for capturing NH 4 Cl that is a byproduct of the reaction. When a TiSiN film is formed through the use of TiCl 4 , NH 3 , and SiH 2 Cl 2 , white powder in addition to the yellow power adheres to the inner wall of the exhaust pipe. These powders deposit at every repetition of the film formation, which will be a cause of clogging the pipe. Therefore, there is such a problem that frequent maintenance is necessary for removing the powders adhering to the inner wall of the exhaust pipe by opening the exhaust pipe. Incidentally, this problem may possibly occur also in a deposition device that forms films while supplying treatment gases simultaneously.  
         BRIEF SUMMARY OF THE INVENTION  
         [0008]    It is an object of the present invention to provide a substrate treatment device, a substrate treatment method, and a cleaning method for the substrate treatment device that are capable of reducing the clogging of an exhaust system.  
           [0009]    A substrate treatment device according to an aspect of the present invention is characterized in that it includes: a treatment chamber in which a substrate is to be placed; a supply system configured to supply at least two kinds of treatment gases to the treatment chamber; an exhaust system having a pump, configured to exhaust the treatment gases from the treatment chamber; and a capturing unit interposed between the treatment chamber and the pump and containing fine grains, configured to capture by the fine grains at least one kind of the treatment gas exhausted from the treatment chamber. According to this substrate treatment device of the present invention, a large amount of the treatment gas can be captured in the capturing unit. As a result, the clogging of the exhaust system can be reduced.  
           [0010]    The fine grains contained in the capturing unit are preferably zeolite. Zeolite may be either synthetic zeolite or natural zeolite. The use of zeolite makes it possible to inhibit the reaction of the treatment gas captured by zeolite with the other treatment gas.  
           [0011]    The capturing unit preferably captures the treatment gas that is liquid or solid at room temperature and at atmospheric pressure. Capturing such a treatment gas makes it possible to inhibit liquid or solid generated in the exhaust system.  
           [0012]    The treatment gas captured by the capturing unit is preferably at least one of TiF 4 , TiCl 4 , TiBr 4 , TiI 4 , Ti[N(C 2 H 5 CH 3 ) 2 ] 4  (TEMAT), Ti[N(CH 3 ) 2 ] 4  (TDMAT), Ti[N(C 2 H 5 ) 2 ] 4  (TDEAT), TaF 5 , TaCl 5 , TaBr 5 , TaI 5 , Ta(NC(CH 3 ) 3 )(N(C 2 H 5 ) 2 ) 3  (TBTDET), Ta(OC 2 H 5 ) 5 , Al(CH 3 ) 3 , Zr(O-t(C 4 H 9 )) 4 , ZrCl 4 , SiH 4 , Si 2 H 6 , SiH 2 Cl 2 , and SiCl 4 . Capturing these treatment gases makes it possible to inhibit the generation of the powder in the exhaust system.  
           [0013]    Another substrate treatment device according to the present invention is characterized in that it includes: a treatment chamber in which a substrate is to be placed; a supply system configured to supply at least two kinds of treatment gases to the treatment chamber; an exhaust system having a pump, configured to exhaust the treatment gases from the treatment chamber; and a capturing unit interposed between the treatment chamber and the pump, configured to capture by a chemical action at least one kind of the treatment gas exhausted from the treatment chamber. The “chemical action” is accompanied by chemical reaction. The “chemical action” includes chemisorption. According to this substrate treatment device of the present invention, a large amount of the treatment gas can be captured in the capturing unit. As a result, the clogging of the exhaust system can be reduced.  
           [0014]    The capturing unit preferably has a metal oxide to capture the treatment gas. The use of the metal oxide enables reliable capturing of the treatment gas. The metal oxide is preferably Al 2 O 3 . The use of Al 2 O 3  makes it possible to capture a large amount of the treatment gas even at reduced pressure.  
           [0015]    Still another substrate treatment device of the present invention is characterized in that it includes: a treatment chamber in which a substrate is to be placed; a supply system configured to supply at least two kinds of treatment gases to the treatment chamber; an exhaust system having at least one pump, configured to exhaust the treatment gases from the treatment chamber; and an inert gas supply system configured to supply an inert gas into the exhaust system that is on a downstream side of the pump on a final stage. The inert gas is a gas inactive to the treatment gases. According to this substrate treatment device of the present invention, the liquefaction of the treatment gases can be inhibited. As a result, the clogging of the exhaust system can be reduced.  
           [0016]    The inert gas preferably includes at least one of Ar, He, and N 2 . The use of these gases enables reliable inhibition of the liquefaction of the treatment gas.  
           [0017]    Yet another substrate treatment device of the present invention is characterized in that it includes: a treatment chamber in which a substrate is to be placed; a supply system configured to supply at least two kinds of treatment gases into the treatment chamber; an exhaust system having at least one pump, configured to exhaust the treatment gases from the treatment chamber; a heater configured to heat the exhaust system that is on a downstream side of the pump on a final stage. According to this substrate treatment device of the present invention, the liquefaction of the treatment gases can be inhibited. As a result, the clogging of the exhaust system can be reduced.  
           [0018]    The treatment gases may include at least one of TiF 4 , TiCl 4 , TiBr 4 , TiI 4 , Ti[N(C 2 H 5 CH 3 ) 2 ] 4 , Ti[N(CH 3 ) 2 )] 4 , Ti[N(C 2 H 5 ) 2 ] 4 , TaF 5 , TaCl 5 , TaBr 5 , TaI 5 , Ta(NC(CH 3 ) 3 )(N(C 2 H 5 ) 2 ) 3 , Ta(OC 2 H 5 ) 5 , Al(CH 3 ) 3 , Zr(O-t(C 4 H 9 )) 4 , ZrCl 4 , SiH 4 , Si 2 H 6 , SiH 2 Cl 2 , and SiCl 4 . These gases are gases that may possibly cause the clogging of the exhaust system, but according to this substrate treatment device of the present invention, the clogging of the exhaust system can be reduced, which allows the use of these gases.  
           [0019]    The substrate treatment device preferably further includes a supply controller configured to control the supply system to supply the treatment gases alternately. When the supply controller is provided, a high-quality film can be formed.  
           [0020]    A substrate treatment method according to another aspect of the present invention includes: a metal-containing gas supply step of supplying a metal-containing gas at a first flow rate into a treatment chamber while the treatment chamber has a substrate placed therein; a metal-containing gas exhaust step of exhausting the metal-containing gas from the treatment chamber via an exhaust system; a nitriding agent gas supply step of supplying a nitriding agent gas into the treatment chamber at a second flow rate that is 10 times as large as the first flow rate or at a larger rate; and a nitriding agent exhaust step of exhausting the nitriding agent gas from the treatment chamber via the exhaust system. The metal-containing gas exhaust step may be conducted either after the metal-containing gas supply step or during the metal-containing gas supply step. The nitriding agent gas supply step may be conducted either after the metal-containing gas supply step or during the metal-containing gas supply step. The nitriding agent gas exhaust step may be conducted either after the nitriding agent gas supply step or during the nitriding agent gas supply step. According to this substrate treatment method of the present invention, the clogging of the exhaust system can be reduced.  
           [0021]    The nitriding agent gas is preferably supplied at a flow rate of 300 sccm to 1000 sccm. The supply of the nitriding agent gas at such a flow rate makes it possible to reduce the clogging of the exhaust system reliably.  
           [0022]    The metal-containing gas may include at least one of TiF 4 , TiCl 4 , TiBr 4 , TiI 4 , Ti[N(C 2 H 5 CH 3 ) 2 ] 4 , Ti[N(CH 3 ) 2 ] 4 , Ti[N(C 2 H 5 ) 2 ] 4 , TaF 5 , TaCl5, TaBr 5 , TaI 5 , and Ta(NC(CH 3 ) 3 )(N(C 2 H 5 ) 2 ) 3 . These gases are gases that may possibly cause the clogging of the exhaust system, but according to this substrate treatment method of the present invention, the clogging of the exhaust system can be reduced, which allows the use of these gases.  
           [0023]    The nitriding agent gas preferably includes NH 3 . When it includes NH 3 , the clogging of the exhaust system can be more reliably reduced.  
           [0024]    A cleaning method for a substrate treatment device according to still another aspect of the present invention is characterized in that it includes: a substrate treatment device preparing step of preparing a substrate treatment device that treats a substrate by supplying a metal-containing gas and a nitriding agent gas to the substrate; and a nitriding agent gas supply step of supplying a nitriding agent gas into an exhaust system of the substrate treatment device while the substrate treatment device does not have the substrate placed therein. According to this cleaning method for the substrate treatment device of the present invention, the clogging of the exhaust system can be reduced.  
           [0025]    The nitriding agent gas supplied in the nitriding agent gas supply step is preferably supplied at a flow rate larger than a flow rate of the nitriding agent gas supplied for the treatment. The supply of the nitriding agent gas at such a flow rate makes it possible to reduce the clogging of the exhaust system reliably.  
           [0026]    The nitriding agent gas supplied in the nitriding agent gas supply step is preferably supplied at a flow rate of 300 sccm to 1000 sccm. The supply of the nitriding agent gas at such a flow rate makes it possible to more reliably reduce the clogging of the exhaust system.  
           [0027]    The metal-containing gas may include at least one of TiF 4 , TiCl 4 , TiBr 4 , TiI 4 , Ti[N(C2H 5 CH 3 ) 2 ] 4 , Ti[N(CH 3 ) 2 ] 4 , Ti[N(C 2 H 5 ) 2 ] 4 , TaF 5 , TaCl 5 , TaBr 5 , TaI 5  and Ta(NC(CH 3 ) 3 )(N(C 2 H 5 ) 2 ) 3 . These gases are gases that may possibly cause the clogging of the exhaust system, but according to this cleaning method for the substrate treatment device of the present invention, the clogging of the exhaust system can be reduced, which allows the use of these gases.  
           [0028]    The nitriding agent gas preferably includes NH 3 . When it includes NH 3 , the clogging of the exhaust system can be more reliably reduced.  
           [0029]    Another cleaning method of a substrate treatment device of the present invention is characterized in that it includes a nitriding agent gas supply step of supplying a nitriding agent gas into an exhaust system of the substrate treatment device that treats a substrate by supplying a metal-containing gas and a nitriding agent gas, while the substrate treatment device does not have the substrate placed therein. According to this cleaning method of the present invention, the clogging of the exhaust system can be reduced. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0030]    [0030]FIG. 1 is a schematic block diagram showing a deposition device according to a first embodiment.  
         [0031]    [0031]FIG. 2 is a schematic vertical sectional view of a capturing unit according to the first embodiment.  
         [0032]    [0032]FIG. 3 is a flowchart showing the flow of the treatment conducted in the deposition device according to the first embodiment.  
         [0033]    [0033]FIG. 4A to FIG. 4D are views schematically showing the treatment conducted in the deposition device according to the first embodiment.  
         [0034]    [0034]FIG. 5 is a schematic block diagram of a deposition device according to a second embodiment.  
         [0035]    [0035]FIG. 6 is a schematic vertical sectional view of a capturing unit according to the second embodiment.  
         [0036]    [0036]FIG. 7 is a flow chart showing the flow of the treatment conducted in the deposition device according to the second embodiment.  
         [0037]    [0037]FIG. 8A and FIG. 8B are views schematically showing the treatment conducted in the deposition device according to the second embodiment.  
         [0038]    [0038]FIG. 9 is a schematic block diagram of a deposition device according to a third embodiment.  
         [0039]    [0039]FIG. 10 is a flowchart showing the flow of the treatment conducted in the deposition device according to the third embodiment.  
         [0040]    [0040]FIG. 11 is a view schematically showing the treatment conducted in the deposition device according to the third embodiment.  
         [0041]    [0041]FIG. 12 is a schematic block diagram of a deposition device according to a fourth embodiment.  
         [0042]    [0042]FIG. 13 is a flowchart showing the flow of the treatment conducted in the deposition device according to the fourth embodiment.  
         [0043]    [0043]FIG. 14 is a view schematically showing the treatment conducted in the deposition device according to the fourth embodiment.  
         [0044]    [0044]FIG. 15 is a flowchart showing the flow of the treatment conducted in a deposition device according to a fifth embodiment.  
         [0045]    [0045]FIG. 16 is a flowchart showing the flow of the overall treatment conducted in a deposition device according to a sixth embodiment.  
         [0046]    [0046]FIG. 17 is a flowchart showing the flow of the treatment for one piece of wafer conducted in the deposition device according to the sixth embodiment.  
         [0047]    [0047]FIG. 18 is a view schematically showing the treatment conducted in the deposition device according to the sixth embodiment. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0048]    (First Embodiment)  
         [0049]    Hereinafter, a deposition device according to a first embodiment of the present invention will be explained. FIG. 1 is a schematic block diagram of the deposition device according to this embodiment.  
         [0050]    As shown in FIG. 1, a deposition device  1  has a chamber  2  formed of, for example, aluminum or stainless steel. Incidentally, surface treatment, for example, the treatment of anodized aluminum may be applied to the surface of the chamber  2 . The chamber  2  has an opening  2 A formed in a side portion thereof, and near the opening  2 A, a gate valve  3  intended for allowing a semiconductor wafer (hereinafter, simply referred to as a ‘wafer’) W to be carried into or carried out of the chamber  2  is attached.  
         [0051]    A susceptor  4  in a substantially disc shape to place the wafer W thereon is disposed in the chamber  2 . The susceptor  4  is formed of, for example, ceramics such as AlN or Al 2 O 3 . A heater  5  for heating the susceptor  4  to a predetermined temperature is provided in the susceptor  4 . When the heater  5  heats the susceptor  4  to the predetermined temperature, the wafer W placed on the susceptor  4  is heated to the predetermined temperature.  
         [0052]    Holes  4 A intended for a wafer up/down are formed in a vertical direction at three places of the susceptor  4 . Wafer up/down pins  6  insertable into the holes  4 A are provided at lower portions of the holes  4 A respectively. The wafer up/down pins  6  are fixed onto a wafer up/down pin support table  7  so as to vertically stand. An air cylinder  8  is fixed to the wafer up/down pin support table  7 . When a rod  8 A of the air cylinder  8  is contracted by the drive of the air cylinder  8 , the wafer up/down pins  6  are moved down so that the wafer W is placed on the susceptor  4 . When the rod  8 A is extended by the drive of the air cylinder  8 , the wafer up/down pins  6  are moved up so that the wafer W is detached from the susceptor  4 . A contractible/extendable bellows  9  covering the rod  8 A is disposed in the chamber  2 . By covering the rod  8 A with the bellows  9 , airtightness inside the chamber  2  is maintained.  
         [0053]    An opening is formed in an upper portion of the chamber  2 . A showerhead  10  to introduce TiCl 4  and NH 3  to the susceptor  4  is inserted in the opening. The showerhead  10  is divided into a TiCl 4  introducing portion  10 A and an NH 3  introducing portion  10 B. A large number of TiCl 4  introducing ports through which TiCl 4  is supplied are formed in the TiCl 4  introducing portion  10 A. Similarly, a large number of NH 3  introducing ports through which NH 3  is supplied are formed in the NH 3  introducing portion  10 B.  
         [0054]    A TiCl 4  supply system  20  to supply TiCl 4  to the TiCl 4  introducing portion  10 A is connected to the TiCl 4  introducing portion  10 A of the showerhead  10 . An NH 3  supply system  30  to supply NH 3  to the NH 3  introducing portion  10 B is connected to the NH 3  introducing portion  10 B.  
         [0055]    The TiCl 4  supply system  20  has a TiCl 4  supply source  21  storing TiCl 4  therein. A TiCl 4  supply pipe  22  having one end connected to the TiCl 4  introducing portion  10 A is connected to the TiCl 4  supply source  21 . A valve  23  and a mass flow controller (MFC)  24  to control the flow rate of TiCl 4  are disposed in the TiCl 4  supply pipe  22 . When the valve  23  is opened while the mass flow controller  24  is in a controlled state, TiCl 4  is supplied to the TiCl 4  introducing portion  10 A from the TiCl 4  supply source  21  at a predetermined flow rate.  
         [0056]    The NH 3  supply system  30  has an NH 3  supply source  31  storing NH 3  therein. An NH 3  supply pipe  32  having one end connected to the NH 3  introducing portion  10 B is connected to the NH 3  supply source  31 . A valve  33  and a mass flow controller  34  to control the flow rate of NH 3  are disposed in the NH 3  supply pipe  32 . When the valve  33  is opened while the mass flow controller  34  is in a controlled state, NH 3  is supplied to the showerhead  10  from the NH 3  supply source  31  at a predetermined flow rate.  
         [0057]    A valve controller  35  that controls the valves  23 ,  33  so as to alternately open the valve  23 ,  33  is electrically connected to the valves  23 ,  33 . Owing to such control over the valves  23 ,  33  by the valve controller  35 , a TiN film excellent in step coverage is formed on the wafer W.  
         [0058]    An exhaust system  40  to exhaust gases such as TiCl 4  and NH 3  is connected to a bottom portion of the chamber  2 . The exhaust system  40  has an auto-pressure controller (APC)  41  to control the pressure inside the chamber  2 . When conductance is adjusted by the auto-pressure controller  41 , the pressure inside the chamber  2  is controlled at a predetermined pressure.  
         [0059]    An exhaust pipe  42  is connected to the auto-pressure controller  41 . The other end of the exhaust pipe  42  is open to the atmosphere. In the exhaust pipe  42 , a main valve  43 , a turbo molecular pump  44 , a trap  45 , a capturing unit  46 , a valve  47 , a dry pump  48 , and a capturing unit  49  are arranged in this order from an upstream side to a downstream side.  
         [0060]    The turbo molecular pump  44  conducts high evacuation. The high evacuation by the turbo molecular pump  44  causes the pressure inside the chamber  2  to be maintained at a predetermined pressure. The turbo molecular pump  44  is also intended for exhausting excessive TiCl 4 , NH 3 , TiN, NH 4 Cl, and so on from the chamber  2 .  
         [0061]    The trap  45  is intended for capturing NH 4 Cl contained in an exhaust gas to remove NH 4 Cl from the exhaust gas. The trap  45  has a housing  45 A in which a flow-in port for letting the exhaust gas in therethrough and a flow-out port for letting the exhaust gas out therethrough are formed. A plate member  45 B is disposed in the housing  45 A, and the plate member  45 B is cooled by a not-shown cooler. When powder of NH 4 Cl comes into contact with the cooled plate member  45 B, the plate member  45 B adsorbs the powder of NH 4 Cl by physical adsorption, so that NH 4 Cl is removed from the exhaust gas.  
         [0062]    The dry pump  48  is intended for assisting the turbo molecular pump  44 . The dry pump  48  also conducts low evacuation of the inside of the chamber  2 . When the pressure of a subsequent stage of the turbo molecular pump  44  is reduced by the dry pump  48 , the exhaust rate of the turbo molecular pump  44  can be increased.  
         [0063]    A roughing out pipe  50  for use in low evacuation by the dry pump  48  is connected to the exhaust pipe  42  between the valve  47  and the dry pump  48 . The other end of the roughing out pipe  50  is connected to the exhaust pipe  42  between the auto-pressure controller  41  and the main valve  43 . A valve  51  is disposed in the roughing out pipe  50 .  
         [0064]    The capturing units  46 ,  49  are intended for capturing TiCl 4  contained in the exhaust gas to remove TiCl 4  from the exhaust gas. The capturing unit  46  will be explained in detail below. FIG. 2 is a schematic vertical sectional view of the capturing unit  46  according to this embodiment.  
         [0065]    As shown in FIG. 2, the capturing unit  46  has a housing  46 C in which a flow-in port  46 A for letting the exhaust gas in therethrough and a flow-out port  46 B for letting the exhaust gas out therethrough are formed. Fine-grained synthetic zeolite  46 D is contained in the housing  46 C. When TiCl 4  contained in the exhaust gas comes into contact with the synthetic zeolite  46 D, the synthetic zeolite  46 D adsorbs TiCl 4  by physical adsorption, so that TiCl 4  is removed from the exhaust gas.  
         [0066]    Hereinafter, the flow of the treatment conducted in the deposition device  1  will be explained, following FIG. 3 to FIG. 4D. FIG. 3 is a flowchart showing the flow of the treatment conducted in the deposition device  1  according to this embodiment, and FIG. 4A to FIG. 4D are views schematically showing the treatment conducted in the deposition device  1  according to this embodiment.  
         [0067]    First, the main valve  43  and the valve  47  are closed, and while the valve  51  is in an open state, the dry pump  48  operates to conduct low evacuation of the inside of the chamber  2 . Thereafter, when the pressure in the chamber  2  is reduced to some extent, the valve  51  is closed and at the same time, the main valve  43  and the valve  47  are opened, so that the low evacuation by the dry pump  48  is changed to the high evacuation by the turbo molecular pump  44  (Step  1 A). Note that the dry pump  48  is kept operating even after this change.  
         [0068]    After the pressure inside the chamber  2  is reduced to, for example, 1.33×10 −2  Pa or lower, the gate valve  3  is opened and a not-shown transfer arm holding the wafer W extends to carry the wafer W into the chamber  2  (Step  2 A).  
         [0069]    Thereafter, the transfer arm contracts and the wafer W is placed on the wafer up/down pins  6 . After the wafer W is placed on the wafer up/down pins  6 , the wafer up/down pins  6  are moved down by the drive of the air cylinder  8 , so that the wafer W is placed on the susceptor  4  having been heated to about 300° C. to about 450° C. (Step  3 A).  
         [0070]    After the temperature of the wafer W is raised, the valve  23  is opened while the pressure inside the chamber  2  is kept at about 50 Pa to about 400 Pa, so that TiCl 4  is introduced to the wafer W from the TiCl 4  introducing portion  10 A at a flow rate of about 30 sccm, as shown in FIG. 4A (Step  4 A). When the introduced TiCl 4  comes into contact with the wafer W, TiCl 4  is adsorbed over the surface of the wafer W.  
         [0071]    After a predetermined period of time passes, the valve  23  is closed to stop the supply of TiCl 4 , and at the same time, TiCl 4  remaining in the chamber  2  is exhausted from the chamber  2 , as shown in FIG. 4B (Step  5 A). Note that the pressure inside the chamber  2  at the time of the exhausting becomes 6.67×10 −2  Pa or lower.  
         [0072]    After a predetermined period of time passes, the valve  33  is opened, so that NH 3  is introduced to the wafer W from the NH 3  j introducing portion  10 B at a flow rate of about 100 sccm, as shown in FIG. 4C (Step  6 A). When the introduced NH 3  comes into contact with TiCl 4  adsorbed by the wafer W, TiCl 4  and NH 3  react with each other, so that a TiN film is formed on the wafer W.  
         [0073]    After a predetermined period of time passes, the valve  33  is closed to stop the supply of NH 3 , and at the same time, NH 3  and so on remaining in the chamber  2  are exhausted from the chamber  2 , as shown in FIG. 4D (Step  7 A). Note that the pressure inside the chamber  2  at the time of the exhausting becomes 6.67×10 −2  Pa or lower.  
         [0074]    After a predetermined period of time passes, it is judged by a not-shown central controller whether or not 200 cycles of the treatment have been conducted, with the processes from Step  4 A to Step  7 A being one cycle (Step  8 A). When it is judged that 200 cycles of the treatment have not been conducted, the processes from Step  4 A to Step  7 A are conducted again.  
         [0075]    When it is judged that 200 cycles of the treatment have been conducted, the wafer up/down pins  6  are moved up by the drive of the air cylinder  8 , so that the wafer W is detached from the susceptor  4  (Step  9 A). Note that when 200 cycles of the treatment are conducted, the TiN film with a thickness of about 10 nm is formed on the wafer W.  
         [0076]    Thereafter, after the gate valve  3  is opened, the not-shown transfer arm extends to hold the wafer W. Finally, the transfer arm contracts to carry the wafer W out of the chamber  2  (Step  10 A).  
         [0077]    In this embodiment, since the capturing unit  46  containing the fine grains is disposed between the chamber  2  and the dry pump  48 , the clogging of the exhaust pipe  42  can be reduced. To be more specific, yellow powder adhering to an inner wall of the exhaust pipe is generated by the reaction between TiCl 4  and NH 3  that are exhausted from the chamber. Concretely, the yellow powder is TiCl 4  n NH 3 (n=2, 4), which is generated by the reaction between TiCl 4  and NH 3  at about 150° C. or lower. The possible reason why a large amount of the yellow powder adheres to the inner wall of the exhaust pipe maintained at the atmospheric pressure is that TiCl 4  is liquefied or a large amount of TiCl 4  adheres to the inner wall of the exhaust pipe. Concretely, as for the liquefaction of TiCl 4 , when TiCl 4  is liquefied, it is difficult for the liquefied TiCl 4  to move. When NH 3  flows therein, the reaction between TiCl 4  and NH 3  occurs one after another. This is the possible reason for the adhesion of a large amount of the yellow powder to the inner wall of the exhaust pipe maintained at the atmospheric pressure. As for the adhesion of a large amount of TiCl 4  to the inner wall of the exhaust pipe, at the atmospheric pressure, TiCl 4  is more easily adsorbed by the inner wall of the exhaust pipe and the adsorbed TiCl 4  is more difficult to be detached than at the reduced pressure. Therefore, an adhesion amount of TiCl 4  to the inner wall of the exhaust pipe increases. When NH 3  flows therein, the reaction between TiCl 4  and NH 3  occurs one after another. This is the possible reason for the adhesion of a large amount of the yellow powder to the inner wall of the exhaust pipe  42  maintained at the atmospheric pressure. Therefore, when TiCl 4  is captured at the reduced pressure, the generation of the yellow powder is inhibited, so that the adhesion of the yellow powder to the inner wall of the exhaust pipe maintained at the atmospheric pressure is inhibited. Here, a trap provided in a conventional deposition device is installed under the condition of the reduced pressure, and therefore, this trap is also likely to be capable of capturing TiCl 4 , but the surface area of the trap is small. Accordingly, an amount of TiCl 4  captured by the trap is very small, which is the possible reason for not allowing effective inhibition of the generation of the yellow powder. In this embodiment, on the other hand, since TiCl 4  is captured by the fine grains, the surface area is large, so that a large amount of TiCl 4  can be captured. Consequently, it is possible to greatly reduce the yellow powder adhering to the inner wall of the exhaust pipe  42 , resulting in the reduction in the clogging of the exhaust pipe  42 . As a result, maintenance frequency can be lowered.  
         [0078]    In this embodiment, owing to the use of the synthetic zeolite  46 D, TiCl 4  adsorbed by the synthetic zeolite  46 D does not easily react with NH 3  that flows in thereafter. As a result, reliable inhibition of the generation of the yellow powder is realized.  
         [0079]    In this embodiment, TiCl 4  and NH 3  are alternately supplied, and even in such a case, the generation of the yellow powder can be reliably inhibited. Specifically, the comparison of the alternate supply of TiCl 4  and NH 3  with the simultaneous supply of TiCl 4  and NH 3  shows that an amount of TiCl 4  exhausted from the chamber  2  is larger in the alternate supply. Therefore, an amount of the generated yellow powder becomes larger in the alternate supply than in the simultaneous supply. In this embodiment, since TiCl 4  can be reliably captured, the generation of the yellow powder can be reliably inhibited even when TiCl 4  and NH 3  are alternately supplied.  
         [0080]    (Second Embodiment)  
         [0081]    Hereinafter, a second embodiment of the present invention will be explained. Note that some of the contents of this embodiment and embodiments thereafter that are the same as those in the previous embodiment will be omitted in the explanation. In this embodiment, the explanation will be given on an example where a capturing unit contains aluminum oxide (Al 2 O 3 ) in addition to synthetic zeolite.  
         [0082]    [0082]FIG. 5 is a schematic block diagram of a deposition device according to this embodiment. As shown in FIG. 5, a deposition device  1  has an SiH 2 Cl 2  supply system  60 . The SiH 2 Cl 2  supply system  60  has an SiH 2 Cl 2  supply source  61  storing SiH 2 Cl 2  therein. An SiH 2 Cl 2  supply pipe  62  having one end connected to a TiCl 4  supply pipe  22  is connected to the SiH 2 Cl 2  supply source  61 . A valve  63  and a mass flow controller  64  to control the flow rate of SiH 2 Cl 2  are disposed in the SiH 2 Cl 2  supply pipe  62 . The valve  63  is opened while the valve  23  is in a closed state and the mass flow controller  64  is in a controlled state, so that SiH 2 Cl 2  is supplied to a TiCl 4  introducing portion  10 A from the SiH 2 Cl 2  supply source  61  at a predetermined flow rate.  
         [0083]    A valve controller  35  to control the valves  23 ,  33 ,  63  so as to open the valve  23 ,  33 ,  63  by turns is electrically connected to the valve  63 . Owing to such control over the valves  23 ,  33 ,  63  by the valve controller  35 , a TiSiN film excellent in step coverage is formed on a wafer W.  
         [0084]    Next, a capturing unit  46  in this embodiment will be explained. FIG. 6 is a schematic vertical sectional view of the capturing unit  46  according to this embodiment. As shown in FIG. 6, fine-grained synthetic zeolite  46 D and fine-grained aluminum oxide  46 E are put in an alternate layered state in the capturing unit  46 . When SiH 2 Cl 2  contained in an exhaust gas comes into contact with the aluminum oxide  46 E, SiH 2 Cl 2  is adsorbed by the aluminum oxide  46 E by chemisorption, so that SiH 2 Cl 2  is removed from the exhaust gas.  
         [0085]    Hereinafter, the flow of the treatment conducted in the deposition device  1  will be explained, following FIG. 7 to FIG. 8B. FIG. 7 is a flowchart showing the flow of the treatment conducted in the deposition device  1  according to this embodiment, and FIG. 8A and FIG. 8B are views schematically showing the treatment conducted in the deposition device  1  according to this embodiment.  
         [0086]    A dry pump  48  is operated to conduct low evacuation of the inside of a chamber  2 . Thereafter, the low evacuation by the dry pump  48  is changed to high evacuation by a turbo molecular pump  44  (Step  1 B).  
         [0087]    After the pressure inside the chamber  2  is reduced to, for example, 1.33×10 −2  Pa or lower, a not-shown transfer arm holding the wafer W extends to carry the wafer W into the chamber  2  (Step  2 B). Thereafter, wafer up/down pins  6  are moved down to place the wafer W on a susceptor  4  (Step  3 B).  
         [0088]    After the temperature of the wafer W is raised, the valve  23  is opened while the pressure inside the chamber  2  is kept at about 50 Pa to about 400 Pa, so that TiCl 4  is introduced from the TiCl 4  introducing portion  10 A (Step  4 B). After a predetermined period of time passes, the valve  23  is closed to stop the supply of TiCl 4  and at the same time, TiCl 4  remaining in the chamber  2  is exhausted from the chamber  2  (Step  5 B).  
         [0089]    After a predetermined period of time passes, the valve  63  is opened, so that SiH 2 Cl 2  is introduced from the TiCl 4  introducing portion  10 A at a flow rate of about 30 sccm, as shown in FIG. 8A (Step  6 B). When the introduced SiH 2 Cl 2  comes into contact with TiCl 4  adsorbed by the wafer W, TiCl 4  and SiH 2 Cl 2  react with each other, so that a film in which Ti and Si are bonded together is formed on the wafer W. After a predetermined period of time passes, the valve  61  is closed to stop the supply of SiH 2 Cl 2  and at the same time, SiH 2 Cl 2  and so on remaining in the chamber  2  are exhausted from the chamber  2 , as shown in FIG. 8B (Step  7 B).  
         [0090]    After a predetermined period of time passes, the valve  33  is opened, so that NH 3  is introduced from an NH 3  introducing portion  10 B (Step  8 B). When the introduced NH 3  comes into contact with the film in which Ti and Si are bonded together on the wafer W, the film in which Ti and Si are bonded together react with NH 3 , so that a TiSiN film is formed on the wafer W. After a predetermined period of time passes, the valve  33  is closed to stop the supply of NH 3 , and at the same time, NH 3  and so on remaining in the chamber  2  are exhausted from the chamber  2  (Step  9 B).  
         [0091]    After a predetermined period of time passes, it is judged whether or not 200 cycles of the treatment, with the processes from Step  4 B to Step  9 B being one cycle, have been conducted (Step  10 B). When it is judged that 200 cycles of the treatment have not been conducted, the processes from Step  4 B to Step  9 B are conducted again.  
         [0092]    When it is judged that 200 cycles of the treatment have been conducted, the wafer up/down pins  6  are moved up, so that the wafer W is detached from the susceptor  4  (Step  11 B). Finally, the wafer W is carried out of the chamber  2  by the not-shown transfer arm (Step  12 B).  
         [0093]    In this embodiment, since the capturing unit  46  containing the aluminum oxide  46 E is disposed between the chamber  2  and the dry pump  48 , the clogging of an exhaust pipe  42  can be reduced. To be more specific, white powder adhering to an inner wall of the exhaust pipe is generated by the reaction between SiH 2 Cl 2  and NH 3  that are exhausted from the chamber. Specifically, the white powder is NH 4 Cl. The possible reason why a large amount of the white powder adheres to the inner wall of the exhaust pipe maintained at the atmospheric pressure is that a large amount of SiH 2 Cl 2  adheres to the inner wall of the exhaust pipe. Concretely, as described above, at the atmospheric pressure, SiH 2 Cl 2  is more easily adsorbed by the inner wall of the exhaust pipe and the adsorbed SiH 2 Cl 2  is more difficult to be detached than at the reduced pressure. Therefore, an adhesion amount of SiH 2 Cl 2  to the inner wall of the exhaust pipe increases. When NH 3  flows therein, the reaction between SiH 2 Cl 2  and NH 3  occurs one after another. This is the possible reason for the adhesion of a large amount of the white powder to an inner wall of the exhaust pipe maintained at the atmospheric pressure. Here, NH 4 Cl is also captured in a trap provided in a conventional deposition device, but NH 4 Cl that this trap is capable of capturing is mainly NH 4 Cl generated in the chamber, and NH 4 Cl generated at the atmospheric pressure cannot be captured. This is the possible reason for not allowing effective inhibition of the generation of the white powder. In this embodiment, on the other hand, SiH 2 Cl 2  that is a generating source of NH 4 Cl is captured in advance at the reduced pressure, so that it is possible to greatly reduce the white powder adhering to the inner wall of the exhaust pipe  42 , thereby reducing the clogging of the exhaust pipe  42 . As a result, maintenance frequency can be lowered.  
         [0094]    In this embodiment, the aluminum oxide  46 E captures SiH 2 Cl 2  by chemisorption. Here, since chemisorption is the adsorption by chemical reaction, even a gas can be adsorbed reliably. Accordingly, an amount of SiH 2 Cl 2  captured in this case is larger than that when SiH 2 Cl 2  is captured by physical adsorption.  
         [0095]    In this embodiment, since the aluminum oxide  46 E is contained in a fine-grained state, so that the surface area thereof is large. Therefore, a larger amount of SiH 2 Cl 2  can be captured.  
         [0096]    In this embodiment, TiCl 4 , SiH 2 Cl 2 , and NH 3  are supplied by turns, and even in such a case, the generation of the white powder can be reliably inhibited. Specifically, the comparison of the supply of TiCl 4 , SiH 2 Cl 2 , and NH 3  by turns with the simultaneous supply of TiCl 4 , SiH 2 Cl 2 , and NH 3  shows that an amount of SiH 2 Cl 2  exhausted from the chamber  2  is larger in the supply by turns. Therefore, an amount of the generated white powder is larger in the supply by turns than in the simultaneous supply. In this embodiment, since SiH 2 Cl 2  can be reliably captured, the generation of the white powder can be reliably inhibited even when TiCl 4 , SiH 2 Cl 2 , and NH 3  are supplied by turns. Since the capturing unit  46 E also contains the synthetic zeolite  46 D, the same effect as in the first embodiment is obtainable.  
         [0097]    (Third Embodiment)  
         [0098]    Hereinafter, a third embodiment of the present invention will be explained. In this embodiment, the explanation will be given on an example where provided is an N 2  supply system to supply N 2  into an exhaust pipe that is on a downstream side of a dry pump.  
         [0099]    [0099]FIG. 9 is a schematic block diagram of a deposition device according to this embodiment. As shown in FIG. 9, an N 2  supply system  70  to supply N 2  into an exhaust pipe  42  is connected to the exhaust pipe  42  that is on a downstream side of a dry pump  48 . The N 2  supply system  70  has an N 2  supply source  71  storing N 2  therein. An N 2  supply pipe  72  having one end connected to the exhaust pipe  42  that is on the downstream side of the dry pump  48  is connected to the N 2  supply source  71 . A valve  73  and a mass flow controller  74  to control the flow rate of N 2  are disposed in the N 2  supply pipe  72 . When the valve  73  is opened while the mass flow controller  74  is in a controlled state, N 2  is supplied into the exhaust pipe  42  from the N 2  supply source  71  at a predetermined flow rate.  
         [0100]    Hereinafter, the flow of the treatment conducted in a deposition device  1  will be explained, following FIG. 10 and FIG. 11. FIG. 10 is a flowchart showing the flow of the treatment conducted in the deposition device  1  according to this embodiment, and FIG. 11 is a view schematically showing the treatment conducted in the deposition device  1  according to this embodiment.  
         [0101]    The dry pump  48  is operated to conduct low evacuation of the inside of a chamber  2 . Thereafter, the low evacuation by the dry pump  48  is changed to high evacuation by a turbo molecular pump  44  (Step  1 C).  
         [0102]    After the pressure inside the chamber  2  is reduced to, for example, 1.33×10 −2  Pa or lower, a not-shown transfer arm holding a wafer W extends to carry the wafer W into the chamber  2  (Step  2 C). Thereafter, wafer up/down pins  6  are moved down to place the wafer W on a susceptor  4  (Step  3 C).  
         [0103]    After the temperature of the wafer W is raised, a valve  23  is opened while the pressure inside the chamber  2  is kept at about 50 Pa to about 400 Pa, so that TiCl 4  is introduced from a TiCl 4  introducing portion  10 A. At this time, N 2  is also supplied into the exhaust pipe  42  at a flow rate of about 1 L/min to about 50 L/min as shown in FIG. 11 (Step  4 C). After a predetermined period of time passes, the valve  23  is closed to stop the supply of TiCl 4  and at the same time, TiCl 4  remaining in the chamber  2  is exhausted from the chamber  2  (Step  5 C).  
         [0104]    After a predetermined period of time passes, the valve  33  is opened, so that NH 3  is introduced from an NH 3  introducing portion  10 B (Step  6 C). After a predetermined period of time passes, the valve  33  is closed to stop the supply of NH 3  and at the same time, NH 3  and so on remaining in the chamber  2  are exhausted from the chamber  2  (Step  7 C).  
         [0105]    After a predetermined period of time passes, it is judged whether or not 200 cycles of the treatment have been conducted (Step  8 C). When it is judged that 200 cycles of the treatment have not been conducted, the processes from Step  4 C to Step  7 C are conducted again.  
         [0106]    When it is judged that 200 cycles of the treatment have been conducted, the valve  73  is closed to stop the supply of N 2  to the exhaust pipe  42  (Step  9 C). Thereafter, the wafer up/down pins  6  are moved up, so that the wafer W is detached from the susceptor  4  (Step  10 C). Finally, the wafer W is carried out of the chamber  2  by the not-shown transfer arm (Step  11 C).  
         [0107]    In this embodiment, since the N 2  supply system  70  to supply N 2  is disposed in the exhaust pipe  42  that is on the downstream side of the dry pump  48 , the clogging of the exhaust pipe  42  can be reduced. To be more specific, the inside of the exhaust pipe  42  that is on the downstream side of the dry pump  48  is kept at the atmospheric pressure. Therefore, when N 2  is supplied into the exhaust pipe  42  that is on the downstream side of the dry pump  48 , the pressure of TiCl 4  is lowered to reduce liquid TiCl 4 . Further, the supply of N 2  causes TiCl 4  to be pushed out, so that TiCl 4  is not easily adsorbed by an inner wall of the exhaust pipe  42  and TiCl 4  adsorbed by the inner wall of the exhaust pipe  42  is easily detached. Consequently, yellow powder adhering to the inner wall of the exhaust pipe  42  can be greatly reduced to reduce the clogging of the exhaust pipe  42 . As a result, maintenance frequency can be lowered.  
         [0108]    (Fourth Embodiment)  
         [0109]    Hereinafter, a fourth embodiment of the present invention will be explained. In this embodiment, the explanation will be given on an example where provided is a tape heater for heating an exhaust pipe that is on a downstream side of a dry pump.  
         [0110]    [0110]FIG. 12 is a schematic block diagram of a deposition device according to this embodiment. As shown in FIG. 12, a tape heater  80  for heating an exhaust pipe  42  is wound around an external wall of the exhaust pipe  42  that is on a downstream side of a dry pump  48 . A tape heater controller  81  that controls the heating temperature of the tape heater  80  by adjusting an electric current passing through the tape heater  80  is electrically connected to the tape heater  80 .  
         [0111]    Hereinafter, the flow of the treatment conducted in a deposition device  1  will be explained, following FIG. 13 and FIG. 14. FIG. 13 is a flowchart showing the flow of the treatment conducted in the deposition device  1  according to this embodiment, and FIG. 14 is a view schematically showing the treatment conducted in the deposition device  1  according to this embodiment.  
         [0112]    The dry pump  48  is operated to conduct low evacuation of the inside of a chamber  2 . Thereafter, the low evacuation by the dry pump  48  is changed to high evacuation by a turbo molecular pump  44  (Step  1 D).  
         [0113]    After the pressure inside the chamber  2  is reduced to, for example, 1.33×10 −2  Pa or lower, a not-shown transfer arm holding a wafer W extends to carry the wafer W into the chamber  2  (Step  2 D). Thereafter, wafer up/down pins  6  are moved down to place the wafer W on a susceptor  4 . Further, the exhaust pipe  42  is heated by the tape heater  80  to about 60° C. to about 100° C. (Step  3 D).  
         [0114]    After the temperature of the wafer W is raised and the temperature of the exhaust pipe  42  becomes stable at 60° C. to 100° C., a valve  23  is opened while the pressure inside the chamber  2  is kept at about 50 Pa to about 400 Pa, so that TiCl 4  is introduced from a TiCl 4  introducing portion  10 A as shown in FIG. 14 (Step  4 D). After a predetermined period of time passes, the valve  23  is closed to stop the supply of TiCl 4  and at the same time, TiCl 4  remaining in the chamber  2  is exhausted from the chamber  2  (Step  5 D).  
         [0115]    After a predetermined period of time passes, a valve  33  is opened, so that NH 3  is introduced from an NH 3  introducing portion  10 B (Step  6 D). After a predetermined period of time passes, the valve  33  is closed to stop the supply of NH 3  and at the same time, NH 3  and so on remaining in the chamber  2  are exhausted from the chamber  2  (Step  7 D).  
         [0116]    After a predetermined period of time passes, it is judged whether or not 200 cycles of the treatment have been conducted (Step  8 D). When it is judged that 200 cycles of the treatment have not been conducted, the processes from Step  4 D to Step  7 D are conducted again.  
         [0117]    When it is judged that 200 cycles of the treatment have been conducted, the heating of the exhaust pipe  42  by the tape heater  80  is stopped (Step  9 D). Thereafter, the wafer up/down pins  6  are moved up, so that the wafer W is detached from the susceptor  4  (Step  10 D). Finally, the wafer W is carried out of the chamber  2  by the not-shown transfer arm (Step  11 D).  
         [0118]    In this embodiment, since the tape heater  80  for heating the exhaust pipe  42  that is on the downstream side of the dry pump  48  is provided, the clogging of the exhaust pipe  42  can be reduced. To be more specific, when the exhaust pipe  42  that is on the downstream side of the dry pump  48  is heated, TiCl 4  is not easily liquefied and liquid TiCl 4  is liable to turn into gas again. Accordingly, liquid TiCl 4  is reduced. Further, when the exhaust pipe  42  that is on the downstream side of the dry pump  48  is heated, TiCl 4  adsorbed by an inner wall of the exhaust pipe  42  is easily detached from the inner wall of the exhaust pipe  42 . Consequently, an amount of TiCl 4  adhering to the inner wall of the exhaust pipe  42  is reduced. This makes it possible to greatly reduce yellow powder adhering to the inner wall of the exhaust pipe  42  to reduce the clogging of the exhaust pipe  42 . As a result, maintenance frequency can be lowered.  
         [0119]    (Fifth Embodiment)  
         [0120]    Hereinafter, a fifth embodiment of the present invention will be explained. In this embodiment, the explanation will be given on an example where NH 3  is supplied at a flow rate about 10 times as large as the flow rate of TiCl 4  or at a larger flow rate.  
         [0121]    [0121]FIG. 15 is a flow chart showing the flow of the treatment conducted in a deposition device  1  according to this embodiment. Note that the deposition device of this embodiment is a similar one to the deposition device in the first embodiment, but the capturing unit  46  is not disposed.  
         [0122]    A dry pump  48  is operated to conduct low evacuation of the inside of a chamber  2 . Thereafter, the low evacuation by the dry pump  48  is changed to high evacuation by a turbo molecular pump  44  (Step  1 E).  
         [0123]    After the pressure inside the chamber  2  is reduced to, for example, 1.33×10 −2  Pa or lower, a not-shown transfer arm holding a wafer W extends to carry the wafer W into the chamber  2  (Step  2 E). Thereafter, wafer up/down pins  6  are moved down to place the wafer W on a susceptor  4  (Step  3 E).  
         [0124]    After the temperature of the wafer W is raised, a valve  23  is opened while the pressure inside the chamber  2  is kept at about 50 Pa to about 400 Pa, so that TiCl 4  is introduced from a TiCl 4  introducing portion  10 A at a flow rate of about 30 sccm (Step  4 E). After a predetermined period of time passes, the valve  23  is closed to stop the supply of TiCl 4  and at the same time, TiCl 4  remaining in the chamber  2  is exhausted from the chamber  2  (Step  5 E).  
         [0125]    After a predetermined period of time passes, a valve  33  is opened, so that NH 3  is introduced from an NH 3  introducing portion  10 B at a flow rate of about 300 sccm to about 1000 sccm (Step  6 E). After a predetermined period of time passes, the valve  33  is closed to stop the supply of NH 3  and at the same time, NH 3  and so on remaining in the chamber  2  are exhausted from the chamber  2  (Step  7 E).  
         [0126]    After a predetermined period of time passes, it is judged whether or not 200 cycles of the treatment have been conducted (Step  8 E). When it is judged that 200 cycles of the treatment have not been conducted, the processes from Step  4 E to Step  7 E are conducted again.  
         [0127]    When it is judged that 200 cycles of the treatment have been conducted, the wafer up/down pins  6  are moved up, so that the wafer W is detached from the susceptor  4  (Step  9 E). Finally, the wafer W is carried out of the chamber  2  by the not-shown transfer arm (Step  10 E).  
         [0128]    In this embodiment, since NH 3  is supplied at a flow rate about 10 times as large as the flow rate of TiCl 4  or at a larger rate, the clogging of an exhaust pipe  42  can be reduced. As a result, maintenance frequency can be lowered.  
       EXAMPLE  
       [0129]    Hereinafter, an example will be explained. In this example, the deposition device according to the fifth embodiment was used and the degree of the clogging of the exhaust pipe was observed.  
         [0130]    Measurement conditions will be explained. In this example, a TiN film was formed on a wafer, using the deposition device according to the fifth embodiment. Incidentally, the TiN film with a thickness of about 10 nm was formed on each of the wafers. TiCl 4  was supplied at a flow rate of about 30 sccm and NH 3  was supplied at a flow rate of about 800 sccm. Further, for comparison with this example, TiCl 4  was supplied at a flow rate of about 30 sccm and NH 3  was supplied at a flow rate of about 100 sccm, and the degree of the clogging of the exhaust pipe  42  in this case was also observed.  
         [0131]    The measurement results will be discussed. When TiCl 4  was supplied at a flow rate of about 30 sccm and NH 3  was supplied at a flow rate of about 100 sccm, the exhaust pipe was clogged at the time after the TiN film was formed on 30 pieces of the wafer and maintenance was required. On the other hand, when TiCl 4  was supplied at a flow rate of about 30 sccm and NH 3  was supplied at a flow rate of about 800 sccm, even the TiN film formation on 100 pieces of the wafers did not cause the exhaust pipe to be clogged, and maintenance was not required. It has been confirmed from these results that the supply of NH 3  at a flow rate about 10 times as large as the flow rate of TiCl 4  or at a larger rate reduces the clogging of the exhaust pipe to lower maintenance frequency.  
         [0132]    (Sixth Embodiment)  
         [0133]    Hereinafter, a sixth embodiment of the present invention will be explained. In this embodiment, the explanation will be given on an example where NH 3  is periodically supplied into an exhaust pipe while a deposition device does not have a wafer carried therein.  
         [0134]    [0134]FIG. 16 is a flowchart showing the flow of the overall treatment conducted in the deposition device according to this embodiment, FIG. 17 is a flowchart showing the flow of the treatment for one piece of wafer conducted in the deposition device according to this embodiment, and FIG. 18 is a view schematically showing the treatment conducted in the deposition device according to this embodiment. The deposition device of this embodiment is a similar one to the deposition device of the first embodiment, but the capturing unit  46  is not disposed.  
         [0135]    First, a TiN film is formed on the first wafer W (Step  1 F). Concretely, high evacuation is first conducted by a turbo molecular pump  44  (Step  101 F). After the pressure inside a chamber  2  is reduced to, for example, 1.33×10 −2  Pa or lower, the first wafer W is carried into the chamber  2  and placed on a susceptor  4  thereafter (Step  102 F, Step  103 F). After the temperature of the wafer W is raised, TiCl 4  is introduced from a TiCl 4  introduceing portion  10 A at a flow rate of about 30 sccm (Step  104 F). Thereafter, the supply of TiCl 4  is stopped, and at the same time, TiCl 4  remaining in the chamber  2  is exhausted from the chamber  2  (Step  105 F). After a predetermined period of time passes, NH 3  is introduced at a flow rate of about 100 sccm (Step  106 F). Thereafter, the supply of NH 3  is stopped, and at the same time, NH 3  and so on remaining in the chamber  2  are exhausted from the chamber  2  (Step  107 F). After a predetermined period of time passes, it is judged whether or not 200 cycles of the treatment have been conducted (Step  108 F). When it is judged that 200 cycles of the treatment have not been conducted, the processes from Step  104 F to Step  107 F are conducted again. When it is judged that 200 cycles of the treatment have been conducted, the wafer W is detached from the susceptor  4 , and the first wafer W is carried out of the chamber  2  by a not-shown transfer arm (Step  109 F, Step  110 F).  
         [0136]    Subsequently, the same processes as in Step  101 F to Step  110 F are also conducted for the second, third, . . . , twenty-fifth wafers W respectively (Step  2 F to Step  25 F).  
         [0137]    After the twenty-fifth wafer W is carried out of the chamber  2 , a valve  33  is opened while the turbo molecular pump  44  and a dry pump  48  are in operation, so that NH 3  is introduced from an NH 3  introducing portion  10 B at a flow rate of about 300 sccm to about 1000 sccm, as shown in FIG. 18 (Step  26 F). The introduced NH 3  is supplied into an exhaust pipe  42  that is on a downstream side of the dry pump  48  via the chamber  2 . The supply of NH 3  while the deposition device  1  does not have the wafer W carried therein is conducted periodically. Specifically, it is conducted for, for example, every 1 lot (25 pieces of the wafers). After a predetermined period of time passes, the valve  33  is closed to stop the supply of NH 3  (Step  27 F).  
         [0138]    In this embodiment, since NH 3  is supplied into the exhaust pipe  42  while the deposition device  1  does not have the wafer W carried therein, the clogging of the exhaust pipe  42  can be reduced. Therefore, the frequency for removing yellow powder by opening the exhaust pipe  42  can be lowered.  
         [0139]    It should be noted that the present invention is not limited to the descried contents in the above embodiments, and the structure, the materials, the arrangement of each member, and so on are appropriately changeable within a range not departing from the sprit of the present invention. Table 1 presents examples of treatment gases for forming film species and these films. TiCl 4  and NH 3  are used in the first embodiment and the third to sixth embodiments, and TiCl 4 , SiH 2 Cl 2 , and NH 3  are used in the second embodiment, but the treatment gases shown in Table 1 are also usable.  
                                           TABLE 1                                                               First   Second   Third       First   Second   Third       Film   Treatment   Treatment   Treatment   Film   Treatment   Treatment   Treatment        Species   Gas   Gas   Gas   Species   Gas   Gas   Gas                   TiN   TiCl 4     NH 3     —   TaN   TaF 5     NH 3     —           TiF 4     NH 3     —       TaCl 5     NH 3     —           TiBr 4     NH 3     —       TaBr 5     NH 3     —           TiI 4     NH 3     —       TaI 5     NH 3     —           TEMAT   NH 3     —       TBTDET   NH 3     —           TDMAT   NH 3     —   TaSiN   TaF 5     NH 3     SiH 4             TDEAT   NH 3     —       TaCl 5     NH 3     SiH 4         TiSiN   TiCl 4     NH 3     SiH 4         TaBr 5     NH 3     SiH 4             TiF 4     NH 3     SiH 4         TaI 5     NH 3     SiH 4             TiBr 4     NH 3     SiH 4         TBTDET   NH 3     SiH 4             TiI 4     NH 3     SiH 4         TaF 5     NH 3     Si 2 H 6             TEMAT   NH 3     SiH 4         TaCl 5     NH 3     Si 2 H 6             TDMAT   NH 3     SiH 4         TaBr 5     NH 3     Si 2 H 6             TDEAT   NH 3     SiH 4         TaI 5     NH 3     Si 2 H 6             TiCl 4     NH 3     Si 2 H 6         TBTDET   NH 3     Si 2 H 6             TiF4   NH 3     Si 2 H 6         TaF 5     NH 3     SiH 2 Cl 2             TiBr 4     NH 3     Si 2 H6       TaCl 5     NH 3     SiH 2 Cl 2             TiI 4     NH 3     Si 2 H 6         TaBr 5     NH 3     SiH 2 Cl 2             TEMAT   NH 3     Si 2 H 6         TaI 5     NH 3     SiH 2 Cl 2             TDMAT   NH 3     Si 2 H 6         TBTDET   NH 3     SiH 2 Cl 2             TDEAT   NH 3     Si 2 H 6         TaF 5     NH 3     SiCl 4             TiCl 4     NH 3     SiH 2 Cl 2         TaCl 5     NH 3     SiCl 4             TiF 4     NH 3     SiH 2 Cl 2         TaBr 5     NH 3     SiCl 4             TiBr 4     NH 3     SiH 2 Cl 2         TaI 5     NH 3     SiCl 4             TiI 4     NH 3     SiH 2 Cl 2         TBTDET   NH 3     SiCl 4             TEMAT   NH 3     SiH 2 Cl 2     Al 2 O 3     Al(CH 3 ) 3     H 2 O   —           TDMAT   NH 3     SiH 2 Cl 2         Al(CH 3 ) 3     H 2 O 2     —           TDEAT   NH 3     SiH 2 Cl 2     ZrO 2     Zr(O-t(C 4 H 9 )) 4     H 2 O   —           TiCl 4     NH 3     SiCl 4         Zr(O-t(C 4 H 9 )) 4     H 2 O 2     —           TiF 4     NH 3     SiCl 4         ZrCl 4     H 2 O   —           TiBr 4     NH 3     SiCl 4         ZrCl 4     H 2 O 2     —           TiI 4     NH 3     SiCl 4     Ta 2 O 5     Ta(OC 2 H 5 ) 5     O 2     —           TEMAT   NH 3     SiCl 4         Ta(OC 2 H 5 ) 5     H 2 O   —           TDMAT   NH 3     SiCl 4         Ta(OC 2 H 5 ) 5     H 2 O 2     —           TDEAT   NH 3     SiCl 4                    
 
         [0140]    TiCl 4  and NH 3  are supplied in the order of TiCl 4  and NH 3  in the first embodiment and the third to sixth embodiments described above, and TiCl 4 , SiH 2 Cl 2 , and NH 3  are supplied in the order of TiCl 4 , SiH 2 Cl 2 , and NH 3  in the second embodiment, but the supply order is not limited to these orders. The same applies to the treatment gases shown in the aforesaid Table 1.  
         [0141]    The capturing unit  46  is disposed in the third embodiment, but the structure in which the capturing unit  46  is not disposed may also be adopted. The tape heater  80  may be wound around as in the fourth embodiment. Further, N 2  is supplied into the exhaust pipe  42 , but other inert gas may be supplied. Moreover, though N 2  is supplied into the exhaust pipe  42  at the time of the supply of TiCl 4 , it is also possible to start supplying N 2  into the exhaust pipe  42  before the supply of TiCl 4 .  
         [0142]    In the fourth embodiment, the exhaust pipe  42  is heated to 60° C. to 100° C., but the heating temperature is not limited to a specific value as long as it is the temperature causing the evaporation of the metal-containing gas. For example, when the metal-containing gas is TaF 5  or TaCl 5  the exhaust pipe  42  is heated to 80° C. to 200° C. When the metal-containing gas is Al(CH 3 ) 3 , Zr(O-t(C 4 H 9))   4 , or Ta(OC 2 H 5 ) 5 , the exhaust pipe  42  is heated to 80° C. to 150° C. Further, the exhaust pipe  42  is heated after the wafer W is carried in, but it is also possible to start heating the exhaust pipe  42  before the wafer W is carried in or while the wafer W is being carried in.  
         [0143]    In the fourth embodiment, the capturing unit  46  is disposed, but the structure without the capturing unit  46  may also be adopted. The tape heater  80  is wound around the exhaust pipe  42 , but any other type is usable as long as it can heat the exhaust pipe  42 .  
         [0144]    In the fifth and sixth embodiments, any of the capturing unit  46 , the N 2  supply system  70 , and the tape heater  80  is not disposed, but it is also possible to dispose at least one of these components. In these cases, a larger amount of TiCl 4  can be captured.  
         [0145]    In the first to sixth embodiments, the wafer W is used, but a glass substrate may be used. Further, the explanation is given on the deposition device  1  that forms a film by alternately supplying TiCl 4  and NH 3  or by supplying TiCl 4 , SiH 2 Cl 2 , and NH 3  by turns, but the present invention is also applicable to a deposition device that forms a film by supplying these gases simultaneously.  
         [0146]    In the first to sixth embodiments, the chamber  2  is evacuated to exhaust TiCl 4  and so on, but it is also possible to supply a purge gas such as N 2  into the chamber  2  at the time of the evacuation. It is also possible to repeat the supply of the purge gas and vacuuming. Moreover, the present invention is applicable to an etching apparatus, not limited to the deposition device. In this case, at least two kinds of etching gases may be alternately supplied or simultaneously supplied.