Patent Publication Number: US-2011048325-A1

Title: Gas Distribution Apparatus and Substrate Processing Apparatus Having the Same

Description:
BACKGROUND 
     The present disclosure relates to a substrate processing apparatus, and more particularly, to a substrate processing apparatus including a gas distribution apparatus configured to supply a source material containing two or more elements. 
     In general, to manufacture semiconductor devices, display devices, and thin film solar batteries, a thin film deposition process for depositing a thin film having a specific material on a substrate, a photolithography process for exposing or covering a selected region of the thin film using a photoresist, and an etching process for removing and patterning the thin film in a selected region are performed. The thin film deposition process and the etching process among the processes are performed within a substrate treating apparatus that is optimized in a vacuum state. 
     In the substrate treating apparatus, a gas distribution apparatus is used for uniformly distributing a processing gas within a processing chamber having a reaction space. Generally, a chemical vapor phase deposition (CVD) process is performed to deposit the thin film on the substrate. When the CVD process is performed, the gas distribution apparatus may increase in temperature to generate powder or particles due to decomposition and reaction of the processing gas between a lid of the processing chamber and the gas distribution apparatus or within the gas distribution apparatus. For example, when a plurality of process gases is supplied into the processing chamber at the same time to form a compound thin film containing two or more elements is deposited, the plurality of processing gases supplied into the gas distribution apparatus may be reacted with each other within the gas distribution apparatus to generate the particles. The ejection hole of the gas distribution apparatus may be blocked by the particles, or the particles may be adsorbed to the substrate to change device properties. 
     Thus, the gas distribution apparatus has a multi-layered structure to solve the limitation in which the particles are generated. That is, the inside of the gas distribution apparatus is divided into upper and lower spaces. One processing gas is supplied into the upper space, and the other processing gas is supplied into the lower space to prevent the processing gases from being gas-reacted with each other within the gas distribution apparatus. A plurality of pin type tubes is adequately arranged and the brazing process is performed several times to manufacture the gas distribution apparatus. As the gas distribution apparatus increases in area, the number of tubes increases. Thus, a fail rate may increases when the tubes are coupled using the brazing process. In addition, the brazing process may be repeatedly performed to cause thermal deformation, and a stress is inherent in the brazed portion to cause a leak. 
     Also, decomposition efficiency may be reduced due to a decomposition temperature difference between the plurality of processing gases, or the processing gas may be decomposed before the processing gas is ejected into the processing chamber. As a result, a thin film deposition speed may be reduced, and uniformity of the thin film may be deteriorated. Also, the usage of the processing gas increases to increase the processing costs. Also, an amount of by-products increases to increase the maintenance and repair costs. 
     SUMMARY 
     The present disclosure provides a gas distribution apparatus in which two or more gases are independently and stably ejected by a first gas distribution plate having a plurality of through holes and manufactured using a drilling or sheet metal forming process and a second gas distribution plate manufactured by coupling a plurality of tubes to each other and including a plurality of nozzles communicating with the plurality of through holes and a substrate treating apparatus including the same. 
     The present disclosure also provides a gas distribution apparatus in which a temperature measurement unit is disposed on a gas distribution plate including a plurality of ejection nozzles to adjust a refrigerant to an adequate temperature and a substrate treating apparatus including the same. 
     The present disclosure also provides a gas distribution apparatus in which decomposition efficiency reduction due to a decomposition temperature difference between a plurality of processing gases and decomposition of the processing gas before the processing gas is ejected are prevented and a substrate treating apparatus including the same. 
     The present disclosure also provides a gas distribution apparatus, which is divided into a plurality of gas distribution apparatuses to couple and separate the gas distribution apparatuses to/from each other and a substrate treating apparatus including the same. 
     In accordance with an exemplary embodiment, a gas distribution apparatus includes: a first gas distribution part configured to eject at least two source materials onto a substrate through routes different from each other; and a second gas distribution part configured to eject a source material having a decomposition temperature greater than an average of decomposition temperatures of the at least two source materials onto the substrate, wherein the first gas distribution part is divided into at least two sections and disposed such that the second gas distribution part is positioned therebetween; and couplable and separable to/from one another. 
     The first gas distribution part may include: a first gas distribution plate connected to a first gas inlet tube configured to introduce a first processing gas, the first gas distribution plate including a plurality of first through holes to pass through the first processing gas; a second gas distribution plate connected to a second gas inlet tube configured to introduce a second processing gas, the second gas distribution plate including a plurality of second through holes aligned with the plurality of first through holes to pass through the first processing gas and a plurality of third through holes passing through the second processing gas; and a third gas distribution plate including a plurality of first and second nozzles aligned with the plurality of second and third through holes and configured to respectively eject the first and second processing gases and a space in which a refrigerant flows. 
     The first gas distribution plate may include: a housing including a space configured to receive the first processing gas supplied from the first gas inlet tube; and a distribution unit disposed within the space, the distribution unit being configured to uniformly distribute the first processing gas introduced from the first gas inlet tube. 
     The distribution unit may include a plate and a plurality of supply hole defined by punching the plate. 
     The second gas distribution plate may include: a housing connected to the second gas inlet tube, the housing providing a space configured to receive the second processing gas; a plurality of pillars including the plurality of second through holes in the space; and a plurality of third through holes defined by punching a lower portion of the housing. 
     The second gas distribution plate may include: a partition disposed within the space; and a buffer space divided by a sidewall of the housing and the partition, the buffer space being configured to receive the second processing gas supplied from the second gas inlet tube. 
     The second gas distribution plate may include a supply hole in the partition to supply the second processing gas of the buffer space to the space. 
     The third gas distribution plate may include: a housing in which the plurality of first and second nozzles is disposed, the housing including the space in which the refrigerant flows; and a refrigerant flow tube connected to the housing to supply or discharge the refrigerant. 
     The housing may include a sidewall surrounding a lateral surface of the space, an upper plate disposed above the sidewall to communicate with the plurality of first and second nozzles, and a lower plate disposed below the sidewall to communicate with the plurality of first and second nozzles. 
     The housing may include a sidewall surrounding a lateral surface of the space and a lower plate in which the plurality of first and second nozzles directly contacting the second gas distribution plate is disposed. 
     The gas distribution apparatus may further include a temperature meter disposed on at least one of the second gas distribution plate and the third gas distribution plate. 
     The second gas distribution part may be disposed at a central portion of a lower side of a chamber lid, and the at least two first gas distribution parts are disposed below the chamber lid such that the second gas distribution part is positioned therebetween. 
     At least one of the at least two first gas distribution plates is spaced apart from each other. 
     The gas distribution apparatus may further include at least one third gas distribution part disposed between the at least two first gas distribution parts to eject a fuzzy gas. 
     The third gas distribution part may eject the fuzzy gas toward an outer side of the substrate. 
     Protrusions may be formed at both lateral surfaces of the at least two first gas distribution parts, and grooves corresponding to the protrusions are formed at both lateral surfaces of the third gas distribution part to insert protrusions into the grooves, thereby coupling the third gas distribution part between the first gas distribution parts. 
     A temperature detector may be disposed below the at least one third gas distribution part. 
     In accordance with another exemplary embodiment, a substrate treating apparatus includes: a chamber including a reaction space; a substrate seat unit disposed in the reaction space of the chamber to radially seat a plurality of substrates with respect to a center thereof; and a gas distribution device including a first gas distribution part configured to eject at least two source materials onto a substrate through routes different from each other and a second gas distribution part configured to eject a source material having a decomposition temperature greater than an average of decomposition temperatures of the at least two source materials onto the substrate, wherein the first gas distribution part is divided into at least two sections and disposed such that the second gas distribution part is positioned therebetween; and couplable and separable to/from one another. 
     The chamber may include a chamber body in which the reaction space is provided and a chamber lid configured to seal the reaction space, and the first and second gas distribution parts are fixed to the chamber lid. 
     A refrigerant path through which a refrigerant is circulated may be disposed in the chamber lid. 
     The first gas distribution part may include: a first gas distribution plate connected to a first gas inlet tube configured to introduce a first processing gas, the first gas distribution plate including a plurality of first through holes to pass through the first processing gas; a second gas distribution plate connected to a second gas inlet tube configured to introduce a second processing gas, the second gas distribution plate including a plurality of second through holes aligned with the plurality of first through holes to pass through the first processing gas and a plurality of third through holes passing through the second processing gas; and a third gas distribution plate including a plurality of first and second nozzles aligned with the plurality of second and third through holes and configured to respectively eject the first and second processing gases, and a space in which a refrigerant flows. 
     The second gas distribution part may include at least one central injection nozzle disposed in a chamber region corresponding to a central region of the substrate seat unit. 
     The second gas distribution part may include: a central injection nozzle disposed in a central region of the first gas distribution part; an extension injection nozzle extending into a space between the first gas distribution parts; and an extension path communicating with the central injection nozzle and the extension injection nozzle. 
     The gas distribution apparatus may further include a path change device disposed in a lower region of the second gas distribution part to eject a processing gas supplied from the second gas distribution part toward the substrate. 
     The path change device may include: a fixed plate a portion of which is respectively connected to the plurality of first gas distribution parts, the fixed plate being disposed at a centre of the plurality of the first gas distribution parts; an extension path extending from a central region of the fixed plate toward the substrate seat unit; and a path change nozzle disposed at an end region of the extension path. 
     The gas distribution apparatus may further include a heating unit configured to heat a processing gas ejected from the second gas distribution part or a plasma generation device configured to ionize the processing gas ejected from the second gas distribution part using plasma. 
     The gas distribution apparatus may further include a protrusion disposed on the substrate seat unit, the protrusion being inserted into a lower side of the second distribution part between the first gas distribution parts. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiments can be understood in more detail from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a sectional view of a substrate treating apparatus in accordance with an exemplary embodiment; 
         FIGS. 2 and 3  are a detailed sectional view and an exploded perspective view illustrating a gas distribution apparatus of a substrate treating apparatus in accordance with an exemplary embodiment, respectively; 
         FIGS. 4A through 4C  are sectional views illustrating a process of manufacturing a third gas distribution plate in accordance with an exemplary embodiment; 
         FIG. 5  is a plan view of a second gas distribution plate in accordance with an exemplary embodiment; 
         FIG. 6  is an exploded perspective view of a gas distribution apparatus in accordance with another exemplary embodiment; 
         FIGS. 7A through 7C  are sectional views illustrating a process of a third gas distribution plate in accordance with another exemplary embodiment; 
         FIG. 8  is an exploded perspective view of a gas distribution apparatus in accordance with another exemplary embodiment; 
         FIG. 9  is a plan view of a substrate seat unit in accordance with another exemplary embodiment; 
         FIGS. 10 and 11  are a sectional view and a plan view of a substrate treating apparatus in accordance with another exemplary embodiment, respectively; 
         FIG. 12  a sectional view illustrating a gas distribution apparatus of a substrate treating apparatus in accordance with another exemplary embodiment; 
         FIG. 13  is a plan view illustrating a gas distribution apparatus of a substrate treating apparatus in accordance with another exemplary embodiment; 
         FIGS. 14 through 16  are a plan view, an exploded perspective view, and a coupled sectional view of a gas distribution apparatus in accordance with another exemplary embodiment; 
         FIG. 17  is a plan view of a gas distribution apparatus in accordance with another exemplary embodiment; and 
         FIGS. 18 through 23  are sectional views of a substrate treating apparatus in accordance with exemplary embodiments. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Hereinafter, specific embodiments will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. Like reference numerals refer to like elements throughout. 
       FIG. 1  is a sectional view of a substrate treating apparatus in accordance with an exemplary embodiment,  FIGS. 2 and 3  are a detailed sectional view and an exploded perspective view illustrating a gas distribution apparatus of a substrate treating apparatus in accordance with an exemplary embodiment, respectively.  FIGS. 4A through 4C  are sectional views illustrating a process of manufacturing a third gas distribution plate in accordance with an exemplary embodiment, and  FIG. 5  is a plan view of a second gas distribution plate in accordance with an exemplary embodiment. 
     Referring to  FIGS. 1 through 5 , a substrate treating apparatus  110  includes a processing chamber  112  providing a reaction space, a gas distribution apparatus  114  disposed at an inner upper portion of the processing chamber  112  to supply processing gases different from each other, a substrate seat unit  118  on which a substrate  116  is seated and facing the gas distribution apparatus  114 , a substrate entrance  120  through which the substrate  116  is loaded or unloaded, and a discharge hole  122  through which the processing gases and a by-product within the reaction space are discharged. The gas distribution apparatus  114  is connected to a radio frequency (RF) power source  124 . A matcher  126  for an impedance matching may be disposed between the gas distribution apparatus  114  and the RF power source  124 . Alternatively, the gas distribution apparatus  114  may not be connected to the RF power source  124  to use a chemical vapor deposition (CVD) method in which the processing gases are simply supplied into the reaction space to form a film. 
     The processing chamber  112  includes a chamber body  110  and a chamber lid  130  detachably coupled to a chamber body  110  to seal the reaction space. The chamber body  110  has a cylindrical or polygonal shape having an opened upper side. The chamber lid  130  has a plate shape having a shape corresponding to that of the chamber body  110 . Although not shown, a sealing member, e.g., an O-ring or a gasket is disposed between the chamber lid  130  and the chamber body  110  to couple the chamber lid  130  to the chamber body  110  using a fixing member. As shown in  FIG. 2 , a passage  146  in which a refrigerant is circulated as a temperature regulating unit by a refrigerant circulation apparatus (not shown) may be disposed to prevent a temperature of the chamber lid  130  from increasing. Here, the temperature of the chamber lid  130  may increase because a temperature within the reaction space is transmitted to the chamber lid  130  coupled to the gas distribution apparatus  114  when the substrate  116  is treated within the reaction space. That is, the refrigerant may prevent the temperature of the chamber lid  130  from increasing due to the increased temperature of the reaction space while it is circulated into the passage  146  disposed within the chamber lid  30 . In addition, it may prevent a temperature of peripheral devices disposed at an upper portion of the camber lid  130  or adjacent to the chamber lid  130  from increasing. 
     As shown in  FIG. 1 , the substrate seat unit  118  is supported by a support  132 . Also, the substrate seat unit  118  ascends or descends and is rotated by the support  132 . The support  132  is connected to a driving unit  131  configured to provide a driving force. A bellows (not shown) for maintaining a sealing and a magnetic thread (not shown) serving as a rotation sealing unit when the support  132  ascends or descends and is rotated are connected between the support  132  and the driving unit  131 . The substrate  118  and the substrate  116  have the same configuration as each other. Although the substrate seat unit  118  on which one substrate  116  is seated is illustrated in  FIG. 1 , the substrate seat unit  118  may include a plurality of susceptors on which the substrate  116  is seated and a disk on which each of the plurality of susceptors is disposed and having a plurality of insertion holes to seat a plurality of substrates  116  thereon. 
     As shown in  FIGS. 2 and 3 , the gas distribution apparatus  114  includes a first gas distribution plate  134  receiving a first processing gas to pass through the first processing gas, a second gas distribution plate  136  receiving a second processing gas to pass through the first and second processing gases, and a third gas distribution plate  138  ejecting the first and second processing gases onto the substrate seat unit  118 . 
     The first gas distribution plate  134  includes a first gas inlet tube  134   a , a first housing  134   b , a baffle  134   c , and a plurality of first through holes  134   d . The first gas inlet tube  134   a  passes through a central portion of the chamber lid  130  to introduce the first processing gas. The first housing  134   b  has a first space  160  receiving the first processing gas. The baffle  134   c  serves as a distribution unit for uniformly distributing the first processing gas supplied from the first gas inlet tube  134   a  into the first housing  134   b . The plurality of first through holes  134   d  is disposed on a bottom surface of the first housing  134   b  to pass through the first processing gas. 
     The second gas distribution plate  136  includes a second gas inlet tube  136   a , a second housing  136   b , a buffer space  136   c , a plurality of second through holes  136   d , and a plurality of third through holes  136   e . The second gas inlet tube  136   a  passes through the chamber lid  130  to introduce a second processing gas. The second housing  136   b  has a second space  162  receiving the second processing gas. The buffer space  136   c  is defined by dividing a lateral space of the second housing  136   b  using a partition  140  and connected to the second gas inlet tube  136   a  to receive the second processing gas before the second processing gas is supplied into the second space  162 . The plurality of second through holes  136   d  communicates with the plurality of first through holes  134   d  to pass through the first processing gas. The plurality of third through holes  136   e  is disposed on a bottom surface of the second housing  136   b  to pass through the second processing gas. The buffer space  136   c  is defined in a lateral surface of the second housing  136   b . A supply hole  142  is defined in the partition  140  to uniformly supply the second processing gas into the second space  162 . The partition  140  is disposed along and inside a sidewall of the second housing  136   b  and spaced a predetermined distance from the sidewall. The buffer space  136   c  is defined between the partition  140  and the second housing  136   b . The buffer space  136   c  receives the second processing gas supplied from the second gas inlet tube  136   a . The buffer space  136   c  has a circular or polygonal ring shape in accordance with a configuration of the gas distribution apparatus  114 . However, when the second gas inlet tube  136   a  is provided in plurality and each of the second gas inlet tubes  136   a  is connected to a lateral surface of the second housing  136   b , a plurality of buffer spaces  136   c  shielded against each other may be defined. Also, the plurality of buffer spaces  136   c  may communicates with each other. That is to say, when the second gas distribution plate  136  has a square shape, one second gas inlet tube  136   a  and one buffer space  136  may be disposed and defined at each of four sides. The supply hole  142  defined in the partition  140  may have a successively extending slit shape having the same height or a plurality of openings interruptedly extending to form isolated patterns. 
     The third gas distribution plate  138  includes a third housing  138   a , a plurality of first nozzles  138   b , a plurality of second nozzles  138   c , and a refrigerant flow tube  152 . The third housing  138   a  has a third space  164  in which a refrigerant flows. The plurality of first nozzles  138   b  is disposed inside the third housing  138   a  and respectively communicates with the plurality of second through holes  136   d  to eject the first processing gas. The plurality of second nozzles  138   c  communicates with the plurality of third through holes  136   e  to eject the second processing gas. The refrigerant flow tube  152  is connected to the third housing  138   a  to circulate the refrigerant. The refrigerant flow tube  152  includes a refrigerant supply tube supplying the refrigerant into the third space  164  and a refrigerant discharge tube discharging the refrigerant within the third space  164 . The refrigerant flow tube  152  passes through the chamber lid  130 , is inserted into the processing chamber  112 , and is connected to a lateral surface of the third housing  138   a . The refrigerant is circulated into the refrigerant circulation apparatus (not shown). 
     When a thin film deposition process is performed on the substrate  116  at a temperature of greater than approximately 1000° C. for a long time in the substrate treating apparatus  110 , the gas distribution apparatus  114  may be overheated to a heat resisting temperature or above. Furthermore, the overheating may seriously occur at the third distribution plate  138  of the gas distribution apparatus  114  facing the substrate seat unit  118 . Thus, the refrigerant circulation apparatus in which the refrigerant is circulated is disposed inside the third distribution plate  138  as a cooling apparatus for preventing the gas distribution apparatus  114  from overheating. In case of the malfunction of the refrigerant circulation apparatus, a first thermo couple  144  is disposed on the third gas distribution plate  138  to measure a temperature of the gas distribution plate  114 . When the gas distribution plate  114  is heated to the heat resisting temperature or above, the heating of the processing chamber  112  is stopped. Also, a second thermo couple (not shown) may be disposed on the second gas distribution plate  136 . The first and second thermo couples measure the temperatures of the third and second gas distribution plates  138  and  136 , respectively, and compare the temperature of the second gas distribution plate  136  with the third gas distribution plate  138  to adjust the temperature of the refrigerant. When a temperature difference between the second and third gas distribution plates  136  and  138  is large, the plurality of second through holes  136   d  and the plurality of first nozzles  138   b , which communicate with each other and the plurality of third through holes  136   e  and the plurality of second nozzles  138   c , which communicate with each other may be misaligned with each other due to thermal expansion. Thus, the refrigerant may be adjusted to prevent the temperature difference between the second and third gas distribution plates  136  and  138  from being generated. As a result, the misalignment between the plurality of second through holes  136   d  and the plurality of first nozzles  138   b  and between the plurality of third through holes  136   e  and the plurality of second nozzles  138   c  due to the thermal expansion may be prevented. 
     Referring to  FIGS. 2 and 3 , the first gas distribution plate  134  of the gas distribution apparatus  114  is fixed to the chamber lid  130 , and the first space  160  receiving the first processing gas introduced through the first gas inlet tube  134   a  is defined between the chamber lid  130  and the first gas distribution plate  134 . A recessed portion  148  is defined in the chamber lid  130  corresponding to the first gas distribution plate  134 , and the baffle  134   c  is disposed between the recessed portion  148  and the first space  160  defined by the first housing  134   b . The baffle  134   c  includes a plate  149  and a plurality of supply holes  150  in which the plate  149  is punched to smoothly supply the first processing gas within the recessed portion  148  into the first space  160 . To smoothly supply the first processing gas within the recessed portion  148  into the first space  160 , any one of the plurality of supply holes  150  may not match the first gas inlet tube  134   a . That is to say, the first processing gas supplied through the first gas inlet tube  134   a  is reflected by the baffle  134   c  and received into the recessed portion  148 . Then, the first processing gas is supplied into the first space  160  through the plurality of supply holes  150 . 
     The first gas distribution plate  134  is manufactured using aluminum having excellent processability. The inside of the first gas distribution plate  134  is drilled using bulk aluminum to define the first space  160  receiving the first processing gas. Then, a bottom surface of the first space  160  is punched to define the plurality of first through holes  134   d  for passing through the first processing gas. Alternatively, without using the bulk aluminum, plates formed of aluminum may be coupled to each other using a welding process, and then a lower portion thereof may be punched to define the first gas distribution plate  134 . A sidewall of the first housing  134   b  has a thickness enough to cover the buffer space  136   c  defined in the second housing  136   b  of the second gas distribution plate  136 . The reason in which the sidewall of the first housing  134   b  has the thickness enough to cover the buffer space  136   c  is because the second gas inlet tube  136   a  connected to the buffer space  136   c  is inserted through the chamber lid  130  and the sidewall of the first housing  134   b . Thus, the sidewall of the first housing  134   b  may have a thickness equal to the sum of a width of the sidewall of the second housing  136   b  and a width of the buffer space  136   c.    
     The plurality of first through holes  134   d  of the first gas distribution plate  134  and the plurality of second through holes  136   d  of the second gas distribution plate  136  are aligned to communicate with each other, and then, the second gas distribution plate  136  is coupled to the first gas distribution plate  134 . The second gas distribution plate  136  is manufactured using aluminum having excellent processability. The second through holes  136   d  vertically passing through the bulk aluminum is defined, and portions between both ends of the bulk aluminum and between the plurality of second through holes  136   d  are drilled to define the buffer space  136   c  and the second space  162  receiving the second processing gas. Then, portions between the plurality of second through holes  136   d  are punched to define the plurality of third through holes  136   e.    
     Referring to  FIGS. 3 and 5 , a bottom surface of the bulk aluminum is drilled to maintain a constant thickness to form a plurality of pillars  166  having the second through holes  136   d . Lower portions of the plurality of pillars  166  constitute the bottom surface of the second housing  136   b  in which the plurality of third through holes  136   e  is defined. Each of the plurality of pillars  166  has an isolated pattern, portions between the plurality of pillars  166  are drilled to define the second spaces  162  communicating with each other. Although each of the plurality of pillars  166  may have a cylindrical shape equal to that of the respective second through holes  136   d , the present disclosure is not limited thereto. For example, considering process convenience, each of the pillars  166  may have a square shape as shown in  FIG. 5 . When each of the plurality of pillars  166  has the square shape, an edge portion of the respective pillars  166  may be rounded so that the second processing gas smoothly flows. The bulk aluminum is drilled to form the sidewall of the second housing  136   b  in which the second space  162  is defined and the partition  140  dividing the buffer spaces  136   c . The partition  140  is processed to define the supply hole  142  through which the second processing gas is supplied at an upper portion of the partition  140 . Although one pillar  166  has one second through hole  136   d  in  FIGS. 3 and 5 , the present disclosure is not limited thereto. For example, as necessary, one pillar  166  may have two or more second through holes  136   d . However, when one pillar  166  has two or more second through holes  136   d , since the number of the third through holes  136   e  is less than that of the second through holes  136   d , a relatively large amount of the second processing gas passing through the plurality of first and second through holes  134   d  and  136   d  may be supplied when compared to the first processing gas. Thus, the number of the second through hole  136   d  formed in one pillar  166  may be adjusted in consideration of a supply rate of the first and second processing gases. 
     The plurality of first through holes  134   d  of the first gas distribution plate  134  and the plurality of second through holes  136   d  of the second gas distribution plate  136  are aligned to communicate with each other. When the second gas distribution plate  136  is coupled to the first gas distribution plate  134 , a lower portion of the first housing  134   b  of the first gas distribution plate  134  surface-contacts an upper portion of the plurality of the pillars  166 . Thus, the first processing gas is transmitted into the plurality of second through holes  136   d  of the second gas distribution plate  136  through the plurality of first through holes  134   d  of the first gas distribution plate  134  while maintaining a sealing of the first processing gas. Here, the second through holes  136   d  adjacent to one third through hole  136   e  have the same distance as each other. That is to say, the third through hole  136   e  is defined at a center of four second through holes  136   d . When the second gas distribution plate  136  is coupled to the first gas distribution plate  134 , the second gas inlet tube  136   a  is inserted into the buffer space  136   c  through the chamber lid  130  and the first gas distribution plate  134 . The buffer space  136   c  and the second space  162  are processed to form the partition  140  between the buffer space  136   c  and the second space  162 , and the second processing gas received into the buffer space  136   c  is supplied into the second space  162  through the supply hole  142 . 
     The third gas distribution plate  138  is coupled to the second gas distribution plate  136  so that each of the second and third through holes  136   d  and  136   e  of the second gas distribution plate  136  communicates with each of the first and second nozzles  138   b  and  138   c  of the third gas distribution plate  138 . The third gas distribution plate  138  is manufactured using a stainless steel or aluminum having strong heat resistance and corrosion resistance. The third gas distribution plate  138  is manufactured through following processes. As shown in  FIG. 4A , first and second plates  170  and  172  formed of a stainless steel are prepared. The first and second plates  170  and  170  are punched to form a plurality of first and second openings  174  and  176  corresponding to the plurality of first and second nozzles  138   b  and  138   c . As shown in  FIG. 4B , a plurality of pin type tubes  178  used as the plurality of first and second nozzles  138   b  and  138   c  for ejecting the first and second processing gases is prepared. Then, the plurality of tubes  178  is inserted into the first and second openings  174  and  176  and arranged. A paste  180  including a filler metal is coated on the first and second plates  170  and  172  in which the plurality of tubes  178  is arranged. As shown in  FIG. 4C , a brazing process is performed to couple the plurality of tubes  178  to the first and second plates  170  and  172 , thereby forming the plurality of first second nozzles  138   b  and  138   c  for ejecting the first and second processing gases. The plurality of tubes  178  disposed outside the third space  164  and protruding from the first plate  170  is cut off, and then, a lateral plate  182  formed of a stainless steel is disposed to couple the lateral plate  182  to lateral surfaces between the first and second plates  170  and  172  using welding, thereby forming the third housing  138   a  having the third space  164  in which the refrigerant flows. The refrigerant flow tube  152  passing through the chamber lid  130  and inserted into a lateral surface of the gas distribution apparatus  114  is connected to the lateral surface of the third housing  138   a . A third refrigerant flows to cool the gas distribution apparatus  114 . 
     As shown in  FIG. 4B , the plurality of tubes  178  inserted into the plurality of first and second openings  174  and  176  protrude to the outside of the first and second plates  170  and  172 . A paste including a filler metal is coated on the first and second plates  170  and  172 . That is to say, the paste coated on the first plate  170  is disposed in the third space  164 , and the paste coated on the second plate  172  is disposed in the third space  164 . As shown in  FIG. 4C , the plurality of tubes  178  disposed outside the third space  164  and protruding from the first and second plates  170  and  172  is cut off so that the first and second plates  170  and  172  and the plurality of tubes  178  are flush with each other. Although not shown in  FIGS. 4A through 4C , a temperature measurement unit, e.g., a thermo couple may be disposed on the first or second plate  170  or  172  to stop the brazing process when a temperature measured in the brazing process exceeds a reasonable temperature. Although the plurality of pin type tubes is formed using the same material as the first and second plates  170  and  172 , the present disclosure is not limited thereto. For example, as necessary, the pin type tubes may be formed using a material different from the first and second plates  170  and  172 . The brazing process represents a method in which a filler metal is added to two parent materials to be jointed at a temperature of approximately 450° C. or more to joint the two patent materials to each other at a temperature of less than a melting point. The processing temperature of the brazing process may be changed in accordance with parent materials of objects to be jointed and a type of a paste including a filler metal. 
     Each of the second and third through holes  136   d  and  136   e  of the second gas distribution plate  136  and each of the plurality of first and second nozzles  138   b  and  138   c  of the third gas distribution plate  138  are aligned and communicate with each other. When the third gas distribution plate  138  is coupled to the second gas distribution plate  136 , a lower portion of the second housing  136   b  of the second gas distribution plate  136  surface-contacts an upper portion of the third housing of the third gas distribution plate  138 . Thus, the first and second processing gases pass through the plurality of second and third through holes  136   d  and  136   e  and the plurality of first and second nozzles  138   b  and  138   c  and are ejected onto the substrate seat unit  118  while maintaining a sealing of the first and second processing gasses. 
     Although the gas distribution apparatus  114  is coupled to the chamber lid  130  in  FIGS. 2 and 3 , the gas distribution apparatus  114  may be disposed spaced from the chamber lid  130 . When the chamber  130  is spaced from the gad distribution apparatus  114 , a separate rear plate connected to the first gas inlet tube  134   a  is disposed on an upper portion of the first gas distribution plate  134 . Here, the first processing gas may include, for example, trimethylgallium (TMGa), biscyclopentadienylmagnesium (Cp 2 Mg), trimethyaluminum (TMAl), and trimethylindium (TMIn), and the second processing gas may include a nitrogen gas such as N 2  and NH 3 , a silicon gas such as SiH 4  and SiH 6 , and H 2 . The gases may be used for forming a light emitting device. For example, when a GaN layer is formed on the substrate  116 , TMG may be used as the first processing gas, and NH 3  may be used as the second processing gas. 
       FIG. 6  is an exploded perspective view of a gas distribution apparatus in accordance with another exemplary embodiment, and  FIGS. 7A through 7C  are sectional views illustrating a process of a third gas distribution plate in accordance with another exemplary embodiment. A gas distribution apparatus in accordance with another exemplary embodiment has the same function as that of the previously described exemplary embodiment. In addition, the gas distribution apparatus in accordance with another exemplary embodiment may be simplified in components to reduce a manufacturing cost. In this exemplary embodiment, the same component as that of the previously described exemplary embodiment is represented by the same reference numeral. 
     Referring to  FIG. 6 , a gas distribution apparatus  114  includes a first gas distribution plate  134  receiving a first processing gas to pass through the first processing gas, a second gas distribution plate  136  receiving a second processing gas to pass through the first and second processing gases, and a third gas distribution plate  138  ejecting the first and second processing gases onto a substrate seat unit  118 . 
     The first gas distribution plate  134  includes a first gas inlet tube  134   a , a first housing  134   b , a baffle  134   c , and a plurality of first through holes  134   d . The first gas inlet tube  134   a  passes through a central portion of a chamber lid  130  to introduce the first processing gas. The first housing  134   b  has a first space  160  receiving the first processing gas. The baffle  134   c  serves as a distribution unit for uniformly distributing the first processing gas supplied from the first gas inlet tube  134   a  into the first housing  134   b . The plurality of first through holes  134   d  is defined in a bottom surface of the first housing  134   b  to pass through the first processing gas. The first housing  134   b  includes a first sidewall  190   a  surrounding the first space  160  and a first lower plate  190   b  disposed below the first sidewall  190   a  and having the plurality of first through holes  134   d.    
     The second gas distribution plate  136  includes a second gas inlet tube  136   a , a second housing  136   b , a buffer space  136   c , a plurality of second through holes  136   d , and a plurality of third through holes  136   e . The second gas inlet tube  136   a  passes through a chamber lid  130  to introduce the second processing gas. The second housing  136   b  has a second space  162  receiving the second processing gas. The buffer space  136   c  is defined by dividing a lateral space of the second housing  136   b  using a partition  140  and connected to the second gas inlet tube  136   a  to receive the second processing gas before the second processing gas is supplied into the second space  162 . The plurality of second through holes  136   d  communicates with the plurality of first through holes  134   d  to pass through the first processing gas. The plurality of third through holes  136   e  is defined in a bottom surface of the second housing  136   b  to pass through the second processing gas. The second housing  136   b  includes a second sidewall  192   a  surrounding a peripheral portion of the second space  162  and a second lower plate  192   b  disposed below the second sidewall  192   a  and having the plurality of first and third through holes  134   d  and  136   e . The buffer space  136   c  is defined in a lateral surface of the second housing  136   b . A supply hole  142  is defined in the partition  140  to uniformly supply the second processing gas into the second space  162 . The partition  140  is disposed along the sidewall  192   a  of the second housing  136   b  and spaced a predetermined distance from the sidewall  192   a . The buffer space  136   c  is defined between the partition  140  and the second housing  136   b . The buffer space  136   c  receives the second processing gas supplied from the second gas inlet tube  136   a . The buffer space  136   c  has a circular or polygonal ring shape in accordance with a configuration of the gas distribution apparatus  114 . However, when the second gas inlet tube  136   a  is provided in plurality and each of the second gas inlet tubes  136   a  is connected to the sidewall  192   a  of the second housing  136   b , a plurality of buffer spaces  136   c  shielded against each other may be defined. Also, the plurality of buffer spaces  136   c  may communicates with each other. That is to say, when the second gas distribution plate  136  has a square shape, one second gas inlet tube  136   a  and one buffer space  136  may be disposed and defined at each of four sides. The supply hole  142  defined in the partition  140  may have a successively extending slit shape having the same height or a plurality of openings interruptedly extending to form isolated patterns. 
     The third gas distribution plate  138  includes a third housing  138   a , a plurality of first nozzles  138   b , a plurality of second nozzles  138   c , and a refrigerant flow tube (now shown). The third housing  138   a  has a third space  164  in which a refrigerant flows. The plurality of first nozzles  138   b  is disposed inside the third housing  138   a  and respectively communicates with the plurality of second through holes  136   d  to eject the first processing gas. The plurality of second nozzles  138   c  communicates with the plurality of third through holes  136   e  to eject the second processing gas. The refrigerant flow tube is connected to the third housing  138   a  to circulate the refrigerant. The third housing  138   a  includes a third sidewall  194   a  surrounding the third space  164  and a third lower plate  194   b  disposed below the third sidewall  194   a  and including the first and second nozzles  138   b  and  138   c . The refrigerant flow tube includes a refrigerant supply tube supplying the refrigerant into the third space  164  and a refrigerant discharge tube discharging the refrigerant within the third space  164 . The refrigerant flow tube passes through the chamber lid  130 , is inserted into the processing chamber  112 , and is connected to the third sidewall  194   a  of the third housing  138   a . The refrigerant is circulated into the refrigerant circulation apparatus (not shown). 
     The third gas distribution plate  138  is manufactured through following processes. As shown in  FIG. 7A , a plate  220  formed of a stainless steel or aluminum is prepared. The pate  220  is punched to form a plurality of first and second openings  174  and  176  corresponding to the plurality of first and second nozzles  138   b  and  138   c . As shown in  FIG. 7B , a plurality of pin type tubes  178  used as the plurality of first and second nozzles  138   b  and  138   c  for ejecting the first and second processing gases is prepared. Then, the plurality of tubes  178  is inserted into the plurality of first and second openings  174  and  176  and arranged. A paste  180  including a filler metal is coated on the plate  222  in which the plurality of tubes  178  is arranged. As shown in  FIG. 7C , a brazing process is performed to couple the plurality of tubes  178  to the first and second plates  170  and  172 , thereby forming the plurality of first second nozzles  138   b  and  138   c  for ejecting the first and second processing gases. A lateral plate  182  formed of a stainless or aluminum is disposed to allow the third space  164  to surround the third space  164  and to be connected a circumference portion of the plate  220 , and then the plate  220  and the lateral plate  182  are coupled to each other using welding to form the third housing  138   a  having the third space  164  in which the refrigerant flows. The refrigerant flow tube passing through the chamber lid  130  and inserted into a lateral surface of the gas distribution apparatus  114  is connected to the lateral surface of the third housing  138   a . A third refrigerant flows to cool the gas distribution apparatus  114 . 
     In another exemplary embodiment, the third housing  138   a  of the third gas distribution plate  138  does not include an upper plate. The third housing  138   a  includes the third sidewall  194   a  and the third lower plate  194   b . Thus, the plurality of tube type first and second nozzles  138   b  and  138   b  communicating with the plurality of second and third through holes  136   d  and  136   e  directly contact the second lower plate  192   b  of the second housing  136   b  constituting the second gas distribution plate  136 . Since each of the plurality of first and second nozzles  138   b  and  138   c  has a tube shape having a certain thickness, upper portions of the plurality of first and second nozzles  138   b  and  138   c  surface-contact a lower portion of the second lower plate  192   b . Thus, another exemplary embodiment, the third gas distribution plate  138  may be manufactured through a relatively simple process when compared to that of the previously described exemplary embodiment. 
       FIG. 8  is an exploded perspective view of a gas distribution apparatus in accordance with another exemplary embodiment, and  FIG. 9  is a plan view of a substrate seat unit in accordance with another exemplary embodiment. In this exemplary embodiment is different from the previously described exemplary embodiments in that first and third gas distribution plates are divided when a gas distribution apparatus is large-scaled. In this exemplary embodiment, the same component as those of the previously described exemplary embodiments is represented by the same reference numeral. 
     Referring to  FIG. 8 , a gas distribution apparatus  144  includes a first gas distribution plate  134  receiving a first processing gas to pass through the first processing gas, a second gas distribution plate  136  receiving a second processing gas to pass through the first and second processing gases, and a third gas distribution plate  138  ejecting the first and second processing gases onto a substrate seat unit (not shown) of a processing chamber. 
     The first gas distribution plate  134  includes a first gas inlet tube  134   a , a first housing  134   b , a baffle  134   c , and a plurality of first sub gas distribution plates  200 . The first gas inlet tube  134   a  passes through a chamber lid  130  to introduce the first processing gas. The first housing  134   b  has a first space  160  receiving the first processing gas. The baffle  134   c  serves as a distribution unit for uniformly distributing the first processing gas supplied from the first gas inlet tube  134   a  into the first housing  134   b . The plurality of first sub distribution plates  200  includes a plurality of first through holes  134   d  defined in a bottom surface of the first housing  134   b  to pass through the first processing gas. 
     Each of the first sub gas distribution plates  200  has a shape varied in accordance to that of the processing chamber. In this exemplary embodiment, the first sub gas distribution plate  200  has a fan shape and an end of the first sub gas distribution plate  200  adjacent to a central portion of the first gas distribution plate  134  has an arc shape so that the first sub gas distribution plate  200  is adequate for a case in which a cylindrical processing chamber is used and a plurality of circular wafers as substrates is stacked and processed. When the plurality of first sub gas distribution plates  200  is combined to assemble the first gas distribution plate  134 , a circular shape having a hollow is formed at a central portion thereof. 
     As shown in  FIG. 9 , in case where a wafer is used as a substrate and a plurality of substrates  116  is stacked on a substrate seat unit  118 , the substrate seat unit  118  includes a plurality of susceptors on which the substrates  116  are seated and a disk  212  on which the plurality of susceptors  210  is disposed. When the first gas distribution plate  134  has a circular shape, the plurality of sub gas distribution plates  200  is divided by a plurality of straight lines passing through a center of the first gas distribution plate  134 . Here, the plurality of first sub gas distribution plates  200  has the same size. When the first gas distribution plate  134  includes six first sub gas distribution plates  200 , each of the first sub gas distribution plates  200  adjacent to a central portion of the first gas distribution plate  134  has an angle of approximately 60°. When the first gas distribution plate  134  has a square shape, the first sub gas distribution plate is divided into a plurality of square shapes having the same size as each other. 
     The first housing  134   b  includes a first sidewall  190   a  surrounding a first space  160  and a first lower plate  190   b  disposed below the first sidewall  190   a  and having a plurality of first through holes  134   d . As shown in  FIG. 9 , the plurality of susceptors  210  is not disposed at a central portion of the disk  212 . Thus, since the substrate  116  is not seated on the central portion of the disk  212 , a substrate treating process is not affected even through the first gas distribution plate  134  has the hollow at the central portion thereof. Also, since the end of the respective first sub gas distribution plates  200  has the arc shape to form the hollow at the central portion of the first gas distribution plate  134 , the first sub gas distribution plate  200  may be easily manufactured and assembled. When the end of the first sub gas distribution plate  200  extends up to the central portion of the processing chamber, it may be difficult to uniformly form the plurality of first through holes  134   d  in the first lower plate  190   b  of the first housing  134   b  corresponding to the end of the first sub gas distribution plate  200 . 
     A first gas inlet tube  134   a  is branched into a plurality of sub gas inlet tubes  204  to supply the first processing gas into the first space  160  of each of the plurality of first sub gas distribution plates  200 . One or more first sub gas inlet tubes  204  are uniformly connected to the first sub gas distribution plate  200 . The first sub gas inlet tube  204  may be buried into the chamber lid  130  to supply the first processing gas at the central portion of the first sub gas distribution plate  200 , or the first sub gas inlet tube  204  may be branched from the first gas inlet tube  134   a  to the first sub gas inlet tube  204  at the outside of the processing chamber and then the first sub gas inlet tube  204  may pass through the chamber lid  130  to supply the first processing gas into the first space of the first sub gas distribution plate  200 . 
     Unlike the previously described exemplary embodiments, in this exemplary embodiment, a recessed portion  148  may not be disposed in the chamber lid  130 . A stepped portion  230  is disposed along an inner circumference of the sidewall  190   a  of the first housing  134   b . When the baffle  134   c  is disposed at the stepped portion  230 , a receiving space  232  receiving the first processing gas supplied from the first sub gas inlet tube  204  is defined above the baffle  134   c  within the first housing  134   b . The baffle  134   c  uniformly supplies the first processing gas within the receiving space  232  into the first space  160 . 
     The second gas distribution plate  136  includes a second gas inlet tube (see reference numeral  136   a  of  FIG. 1 ), a second housing  136   b , a buffer space  136   c , a plurality of second through holes  136   d , and a plurality of second sub gas distribution plates  206 . The second gas inlet tube  136   a  passes through the chamber lid  130  to introduce a second processing gas. The second housing  136   b  has a second space  162  receiving the second processing gas. The buffer space  136   c  is defined by dividing a lateral space of the second housing  136   b  using a partition  140  and connected to the second gas inlet tube  136   a  to receive the second processing gas before the second processing gas is supplied into the second space  162 . The plurality of second through holes  136   d  communicates with the plurality of first through holes  134   d  to pass through the first processing gas. The plurality of second sub gas distribution plates  206  includes a plurality of third through holes  136   e  defined in a bottom surface of the second housing  136   b  to pass through the second processing gas. 
     The second sub gas distribution plate  206  has the same shape as the first sub gas distribution plate  200 . Thus, like the first sub gas distribution plate  200 , the second sub gas distribution plate  206  has a fan shape, and an end of the second sub gas distribution plate  206  adjacent to a central portion of the second gas distribution plate  136  has an arc shape. Also, when the plurality of second sub gas distribution plates  206  is assembled to assemble the second gas distribution plate  136 , the second gas distribution plate  136  has a circular shape having a hollow at a central portion thereof. The second housing  136   b  includes a second sidewall  192   a  surrounding a peripheral portion of the second space  162  and a second bottom surface  192   b  disposed below the second sidewall  192   a  and having the plurality of first and third through holes  134   d  and  136   e . The buffer space  136   c  is defined in a lateral space of the second housing  136   b . A supply hole  142  is defined in a partition  140  to uniformly supply the second processing gas into the second space  162 . The partition  140  is disposed along and within the sidewall  192   a  of the second housing  136   b  and spaced a predetermined distance from the sidewall  192   a . The buffer space  136   c  is defined between the partition  140  and the second housing  136   b . The buffer space  136   c  receives the second processing gas supplied from the second gas inlet tube  136   a . The supply hole  142  defined in the partition  140  may have a successively extending slit shape having the same height or a plurality of openings interruptedly extending to form isolated patterns. 
     The third gas distribution plate  138  includes a third housing  138   a , a plurality of first nozzles  138   b , a plurality of second nozzles  138   c , and a plurality of sub gas distribution plates  208 . The third housing  138   a  has a third space  164  in which a refrigerant flows. The plurality of first nozzles  138   b  is disposed inside the third housing  138   a  and respectively communicates with the plurality of second through holes  136   d  to eject the first processing gas. The plurality of second nozzles  138   c  communicates with the plurality of third through holes  136   e  to eject the second processing gas. The plurality of sub gas distribution plates  208  includes a refrigerant flow tube connected to the third housing  138   a  to circulate the refrigerant. The third housing  138   a  includes a third sidewall  194   a  surrounding the third space  164  and a third lower plate  194   b  disposed below the third sidewall  194   a  and including the first and second nozzles  138   b  and  138   c . The refrigerant flow tube includes a refrigerant supply tube supplying the refrigerant into the third space  164  and a refrigerant discharge tube discharging the refrigerant within the third space  164 . The refrigerant flow tube passes through the chamber lid  130 , is inserted into the processing chamber  112 , and is connected to a lateral surface of the third housing  138   a . The refrigerant is circulated into the refrigerant circulation apparatus (not shown). 
     The third sub gas distribution plate  208  has the same shape as the first and second sub gas distribution plates  200  and  206 . Thus, like the first and second sub gas distribution plates  200  and  206 , the third sub gas distribution plate  208  has a fan shape, and an end of the third sub gas distribution plate  208  adjacent to a central portion of the third gas distribution plate  138  has an arc shape. Also, when the plurality of third sub gas distribution plates  208  is assembled to assemble the third gas distribution plate  138 , the third gas distribution plate  138  has a circular shape having a hollow at a central portion thereof. The third housing  138   b  includes a third sidewall  194   a  surrounding a peripheral portion of the third space  164  and a third lower plate  194   b  disposed below the third sidewall  194   a  and including the plurality of first and second nozzles  138   b  and  138   c.    
     In this exemplary embodiment, the third housing  138   a  of the third gas distribution plate  138  includes the third sidewall  194   a  and the third lower plate  194   b . Also, the plurality of tube type first and second nozzles  138   b  and  138   b  communicating with the plurality of second and third through holes  136   d  and  136   e  directly contact the second lower plate  192   b  of the second housing  136   b  constituting the second gas distribution plate  136 . As necessary, the third housing  138   a  may include an upper plate communicating with the plurality of first and second nozzles  138   b  and  138   c . Since each of the plurality of first and second nozzles  138   b  and  138   c  has a tube shape having a certain thickness, upper portions of the plurality of first and second nozzles  138   b  and  138   c  surface-contact a lower portion of the second lower plate  192   b . Thus, in this exemplary embodiment, the third gas distribution plate  138  may be manufactured through a relatively simple process when compared to that of the previously described exemplary embodiment. 
     A gas distribution apparatus  114  in accordance with another exemplary embodiment may eject at least portion of a plurality of processing gases onto direct upper regions of substrate  116  and supply a processing gas having a high decomposition temperature of the plurality of processing gases into a space (e.g., a central upper region of a substrate seat unit  118 ) between the plurality of substrates  116 . In this case, the plurality of substrates  116  may be seated on the substrate seat unit  118  and radially disposed with respect to a center of the substrate seat unit  118 . Thus, the processing gas having the high decomposition temperature may be supplied into a region having the highest temperature of a chamber lid region to improve decomposition efficiency. The gas distribution apparatus  114  in accordance with another exemplary embodiment and a substrate treating apparatus including the same will be described below. Descriptions of duplicate parts with the foregoing exemplary embodiments are omitted. 
       FIGS. 10 and 11  are a sectional view and a plan view of a substrate treating apparatus in accordance with another exemplary embodiment, respectively, and  FIG. 12  a sectional view illustrating a gas distribution apparatus of a substrate treating apparatus in accordance with another exemplary embodiment. 
     Referring to  FIGS. 10 and 12 , a substrate treating apparatus in accordance with this exemplary embodiment includes a processing chamber  112  providing a reaction space, a substrate seat unit  118  disposed in the reaction space of the processing chamber  112  to seat a substrate  116 , and a gas distribution apparatus  114  disposed in the reaction space of the processing chamber  112  to supply processing gases different from each other. Also, the gas distribution apparatus  114  includes first and second gas distribution parts  310  and  320 . Here, the first gas distribution part  310  is provided in plurality. Each of the plurality of first gas distribution parts  310  includes first, second, and third gas distribution plates  134 ,  136 , and  138 , which are stacked with each other. 
     In the gas distribution apparatus  114  in accordance with this exemplary embodiment, the first gas distribution part  310  supplies at least portion of a plurality of processing gases onto direct upper regions of the substrate  116 . Also, the second gas distribution part  320  supplies supply a processing gas having a high decomposition temperature of the plurality of processing gases into a space (e.g., a central upper region of the substrate seat unit  118 ) between the plurality of substrates  116 . Thus, the processing gas having the high decomposition temperature may be ejected into a region having the highest temperature of a chamber lid region to improve decomposition efficiency. That is, the gas distribution apparatus  114  is disposed on a lower bottom surface of a chamber lid  130 , and the processing gas having the high decomposition temperature is supplied to the region having the highest temperature of a region in which the gas distribution apparatus  114  is disposed. Thus, thin film deposition efficiency may be improved, and a non-reacted derelict processing gas may be reduced. An average temperature of decomposition temperatures of the plurality of processing gases may be calculated to supply a processing material having a decomposition temperature greater than the average temperature into the spaces between the plurality of substrates  116 . Here, the processing gas having the decomposition temperature greater than the average temperature is referred to as a processing gas having a high decomposition temperature. Also, a processing gas having a decomposition temperature less than the average temperature is cooled and then supplied. Thus, it may prevent the processing gas having the lower decomposition temperature from being decomposed and reacted within the first gas distribution part  310 . The gas distribution apparatus  114  includes a processing gas storage part  400  through which the processing gases are supplied. Also, the gas distribution apparatus  114  further includes a refrigerant storage part  500  through which a refrigerant for cooling the processing gases is supplied. 
     An apparatus configured to deposit two binary compound on the substrate using two processing gases described below will be mainly described. That is, first and second processing gas storage parts  410  and  420  are provided to eject first and second processing gases within the first and second processing gas storage parts  410  and  420  onto the substrate  116 , respectively. Here, the first and second processing gas storage parts  410  and  420  may store a material having a gaseous state and a material having a liquid state. For convenience, the first and second processing gas storage parts  410  and  420  are called the processing gas storage part  400 . Also, this exemplary embodiment is not limited thereto, and a large number of source materials may be used. Here, the first processing gas may include materials such as TMGa, Cp 2 Mg, TMAl, and TMIn, and the second processing gas may include a nitrogen gas such as N 2  and NH 3 , a silicon gas such as SiH 4  and SiH 6 , and H 2 . 
     The first gas distribution part  310  receives the first and second processing gases through first and second gas supply tubes  412  and  422  to supply the first and second processing gases to the substrate  116  through separated spaces (or routes). The first gas distribution part  310  cools the first and second processing gases to supply the cooled first and second processing gases. The first gas distribution part  310  includes a first gas distribution plate  134 , a second gas distribution plate  136 , and a third gas distribution plate  138 . The first gas distribution plate  134  receives the first processing gas of the first gas storage part  410  through the first gas supply tube  412  to supply the first processing gas. The second gas distribution plate  136  receives the second processing gas of the second gas storage part  420  through the second gas supply tube  422  to supply the second processing gas. The third gas distribution plate  138  cools the supplied processing gases. Here, the first, second, and third gas distribution plates  134 ,  136 , and  138  are vertically stacked with each other. As shown in  FIG. 10 , the third gas distribution plate  138  may be disposed between the first and second gad distribution plates  134  and  136  and the substrate seat unit  118  to prevent the processing gases within the first and second gas distribution plates  134  and  136  from being decomposed due to heat of the substrate seat unit  118 . As described above, each of the gas distribution plates may be variously varied in accordance with the number of processing gases. 
     The first gas distribution plate  134  includes a first gas inlet tube  134   a , a first housing  134   b , and a plurality of first through holes  134   d . The first gas inlet tube  134   a  passes through a chamber lid  130  to introduce the first processing gas. The first housing  134   b  has a first space  160  receiving the first processing gas. The plurality of first through holes  134   d  extends from the first housing  134   b  to pass through the first processing gas. Also, the first gas distribution plate  134  may further include a baffle (not shown) uniformly distributes the first processing gas into the first housing  134   b . The second gas distribution plate  136  includes a second gas inlet tube  136   a , a second housing  136   b , a plurality of second through holes  136   d , and a plurality of third through holes  136   e . The second gas inlet tube  136   a  passes through the chamber lid  130  to introduce the second processing gas. The second housing  136   b  has a second space  162  receiving the second processing gas. The plurality of second through holes  136   d  communicates with the plurality of first through holes  134   d  to pass through the first processing gas. The plurality of third through holes  136   e  is defined in a bottom surface of the second housing  136   b  to pass through the second processing gas. The third gas distribution plate  138  includes a third housing  138   a , a plurality of first nozzles  138   b , and a plurality of second nozzles  138   c . The third housing  138   a  having a third space  164  in which a refrigerant flows. The plurality of first nozzles  138   b  is disposed inside the third housing  138   a  and respectively communicates with the plurality of second through holes  136   d  to eject the first processing gas. The plurality of second nozzles  138   c  communicates with the plurality of third through holes  136   e  to eject the second processing gas. Also, the third gas distribution plate  138  further includes a refrigerant flow tube  152  connected to the third housing  138   a  to circulate the refrigerant. The refrigerant flow tube includes a refrigerant supply tube  152   a  supplying the refrigerant into the third space  164  and a refrigerant discharge tube  152   b  discharging the refrigerant within the third space  164 . The first through third gas distribution plates  134 ,  136 , and  138  may have the same components as those described with reference to  FIGS. 1 through 9 . 
     As described above, the first processing gas supplied into the first space  160  of the first gas distribution plate  134  is supplied into an inner space (i.e., a reaction space) of the processing chamber  112  through the first through hole  136   d  passing through the second space  162  of the second gas distribution plate  136  and the first nozzle  138   d  of the third gas distribution plate  138 . Also, the second processing gas supplied into the second space  162  of the second gas plate  136  is supplied into an inner space of the processing chamber  112  through the third through hole  136   e  and the second nozzle  138   c  of the third gas distribution plate  318 . 
     The first and second processing gases may have temperatures less than that of the substrate seat unit  118  by the refrigerant. Thus, it may prevent the first and second processing gases from being decomposed by heat before the first and second processing gases are ejected into the reaction space of the processing chamber  112 . In particular, when a compound thin film containing two or more elements is deposited, two or more source materials having decomposition temperatures different from each other should be used. Thus, when the third gas distribution plate  138  in which the refrigerant is circulated is not used, a processing gas having a relatively lower decomposition temperature in the two or more processing gases is decomposed by heat at the inside (i.e., inner spaces  160  and  162 ) of the first and second gad distribution plates  134  and  136  due to the heat of the substrate seat unit  118 . Thus, thin film deposition efficiency may be significantly reduced to generate particles. 
     In accordance with this exemplary embodiment, the third gas distribution plate  138  in which the refrigerant is circulated is provided to cool the first and second spaces  160  and  162  of the first and second gas distribution plates  134  and  136  as well as the first and second nozzles  138   b  and  138   c , thereby preventing the processing gases from being decomposed by the heat. However, in this case, since the processing gas having a relatively high decomposition temperature in the two or more processing gases is cooled, the decomposition efficiency may be reduced. In case of the processing gas having the relatively high decomposition temperature, the processing gas is supplied into the reaction space of the processing chamber  112  and then is heated within the reaction space. However, there is a limitation that the processing gas does not have sufficient decomposition efficiency by the heating. Thus, to solve the limitation, a supply amount of the processing gas having the relatively high decomposition temperature should increase. Since the processing gas having the relatively high decomposition temperature is cooled to reduce the decomposition efficiency, the supply amount of the processing gas may increase. Thus, an amount of a non-reacted derelict source material may increase to increase process costs. 
     As described above, the processing gas having the relatively high decomposition temperature in the two or more processing gases may be ejected into a central region of the substrate seat unit  118  through the second gas distribution part  320  to solve the above-described limitation. That is, in this exemplary embodiment, the first gas distribution part  310  having a plate shape and corresponding to the substrate seat unit  118  is separated into the plurality of first gas distribution parts  310  corresponding to the substrates  116  as shown in  FIG. 11 . Thus, the first gas distribution part  310  disposed above a central region of the substrate seat unit  180  is removed. That is, the central region of the substrate seat unit  180  is opened toward an upper side (i.e., a chamber lid region). The second gas distribution part  320  ejecting the processing gas having the relatively high decomposition temperature in the two or more processing gases into the upper region of the central portion of the substrate seat unit  118 , i.e., a central region of the chamber lid  130  is disposed. The second gas distribution part  320  includes a central ejection nozzle  321  disposed at a position of the chamber lid  130  corresponding to the central region of the substrate seat unit  118 . The central ejection nozzle  321  communicates with the second processing gas storage part  420  in which a decomposition temperature is high. Thus, the central ejection nozzle  321  may supply the second processing gas having the relatively high decomposition temperature into the upper region of the central portion of the substrate seat unit  118 . Here, the second processing gas supplied into the central region of the substrate seat unit  118  is ejected from a peripheral region of the chamber lid  130  toward the substrate seat unit  118 . Then, the second processing gas is moved toward the substrates  116  radially disposed around the central region of the substrate seat unit  118 . Thus, the second processing gas has a movement distance greater than that of the second processing gas ejected from the first gas distribution part  310 . That is, the second processing gas ejected into the central region of the substrate seat unit  118  is moved into an edge region of the substrate seat unit  118  and exhausted. This is because the second processing gas is exhausted through a lower edge region of the substrate seat unit  118 . Here, as the movement distance (i.e., a path) of the processing gas increases, the second processing gas ejected from the second gas distribution part  320  may receive the heat of the substrate seat unit  118  for a longer time. Thus, the second processing gas may be pre-heated by a temperature within a chamber to improve the decomposition efficiency. Furthermore, since separate cooling members are not disposed between the second gas distribution part  320  and the substrate seat unit  118 , it may prevent the ejected second processing gas from being cooled. 
     In this exemplary embodiment, since the processing gas having the relatively high decomposition temperature in the two or more processing gases is additionally supplied into the second gas distribution part  320 , the decomposition efficiency may be improved. Thus, a supply amount of the processing gas having the relatively high decomposition temperature may be reduced by about 10% than that of related art. In this exemplary embodiment, the second processing gas of the second gas storage part  420  is supplied into the second gas inlet tube  136   a  of the second gas distribution plate  136  and the central ejection nozzle  321  of the second gas distribution part  320 . Here, a flow controller such as a mass flow controller (MFC) may be disposed at the second gas inlet tube  136   a  and the central ejection nozzle  321  to vary a flow amount (i.e., supply amount) of the second processing gas. Also, a flow controller may be disposed between the first gas inlet tube  136   a  of the first gas distribution plate  134  and the first gas storage part  410 . 
     The substrate treating apparatus of this exemplary embodiment is not limited to the above-described descriptions. That is, the substrate treating apparatus may be variously varied. Hereinafter, modified examples of the substrate treating apparatus will be described. The modified examples described below may be mutually applicable to each other. 
     Referring to  FIG. 13 , a first gas distribution part  310  may be manufactured in one body to cover all substrates  116  disposed on a substrate seat unit  118 . Thus, the first gas distribution part  310  may have a ring shape. A second gas distribution part  320  is disposed at a central region of the ring shape. Since the first gas distribution part  310  has the ring shape, the substrate seat unit  118  may be rotated. That is, processing gases may be continuously supplied onto the substrates  116  even through the substrate seat unit  118  is rotated. This is because the first gas distribution part  310  is manufactured in the ring shape corresponding to a rotation radius due to the rotation of the substrate seat unit  118 . Thus, since the substrate seat unit  118  is rotated, uniformity of a thin film deposited on the substrate  116  may be improved. Here, as shown in  FIG. 13 , the first gas distribution part  310  having the ring shape may include a plurality of blocks. When a plurality of large-scaled substrates is seated, the first gas distribution part  310  having the ring shape may increase in diameter. Thus, it may be difficult to manufacture the gas distribution apparatus using a single processing. As shown in  FIG. 13 , the plurality of first gas distribution parts  310  having an approximately fan shape (four blocks in  FIG. 13 ) may be provided to couple them to each other, thereby manufacturing the first gas distribution part  310  having the ring shape. Here, each of the coupled blocks may be independently operated. Also, as shown in  FIG. 13 , a processing gas supplied into the first gas distribution part  310  having the ring shape and the second gas distribution part  320  may be supplied through tubes different from each other. Also, the tubes may be connected to storage tanks different from each other. 
     A separable and couplable gas distribution apparatus  114  may be manufactured as shown in  FIGS. 14 through 16 . Here,  FIG. 14  is a plan view of a gas distribution apparatus in accordance with another exemplary embodiment,  FIG. 15  is an exploded perspective view of a gas distribution apparatus in accordance with another exemplary embodiment, and  FIG. 16  is a coupled sectional view of a gas distribution apparatus in accordance with another exemplary embodiment. 
     Referring to  FIGS. 14 through 16 , a gas distribution apparatus  114  in accordance with this exemplary embodiment includes a second gas distribution part  320 , a plurality of separable and couplable first gas distribution part  310 , and a third gas distribution part  330 . The second gas distribution part is disposed at a lower central portion of a chamber lid  130 . The plurality of first gas distribution part  310  contacts a lateral surface of the second gas distribution part  320  and is disposed at a lower side of the chamber lid  130 . The third gas distribution part  330  is disposed between the plurality of first gas distribution part  310  to supply a fussy gas. That is, in a source material supply part  300  in accordance with this exemplary embodiment, a central ejection part  320  is disposed at the lower central portion of the chamber lid  120 , a plurality of source material ejection parts  310  is coupled to the lower side of the chamber lid  120  to contact the central ejection part  320 , and a plurality of fuzzy gas injection part is coupled between the plurality of source material ejection parts  310 . 
     Referring to  FIGS. 14 and 15 , the chamber lid  130  has a shape approximately equal to that of that inside of a chamber body  129 , e.g., a circular plate shape with a predetermined thickness. A plurality of inflow holes  611 ,  612 , and  613  vertically passing through the chamber lid  130  is defined in the chamber lid  130 . The plurality of inflow holes  611 ,  612 , and  613  are defined in regions respectively corresponding to the second gas distribution part  320 , the plurality of first gas distribution parts  310 , and the plurality of third gas distribution parts  330 . That is, one second inflow hole  612  is defined at a central portion corresponding to the second gas distribution part  320 , the first and second inflow holes  611  and  612  are defined at portions corresponding to the plurality of first gas distribution parts  310 , and the third inflow hole  613  is defined at a portion corresponding to the plurality of third gas distribution parts  330 . Here, one first inflow hole  611  and at least one second inflow hole  612  may be defined at a region corresponding to the first gas distribution part  310 . The number of the second inflow hole  612  may be changed in accordance with an inflow rate of the first and second processing gases. For example, three second inflow holes  612  may be defined in one first gas distribution part  310 . Also, one first inflow hole  611  and at least one second inflow hole  612  defined in the region corresponding to the first gas distribution part  310  may be arranged with an equal interval in accordance with a configuration of the first gas distribution part  310 . That is, one first inflow hole  611  may be defined at a central portion of the region corresponding to the first gas distribution part  310 , and at least one, e.g., three second inflow holes  612  may be defined with an equal interval with respect to the first and second inflow holes  611  and  612 . The first inflow hole  611  is connected to a first gas supply tube  412  supplying the first processing gas, the second inflow hole  612  is connected to a second gas supply tube  422  supplying the second processing gas, and the third inflow hole  613  is connected to a fuzzy gas supply tube  432  supplying the fuzzy gas. Thus, the second gas distribution part  320  and the first gas distribution part  310  receive the first and second processing gases stored in first and second gas storage parts  410  and  420  from the first and second gas supply tubes  412  and  422  through the first and second inflow holes  611  and  612 . Also, the third gas distribution part  330  receives the fuzzy gas from the fuzzy gas supply tube  432  through the third inflow hole  613 . The first and second gas supply tubes  412  and  422  may be disposed toward the central portion of the chamber lid  130 , branched from the central portion of the chamber lid  130 , and connected to the first and second inflow holes  611  and  612 . Also, the first and second gas supply tubes  412  and  422  may be branched from the outside of the chamber lid  130  and connected to the first and second inflow holes  612  and  612 . Here, a relatively small amount of the first processing gas is introduced to perform a deposition process when compared to an amount of the second processing gas. 
     The second gas distribution part  320  is disposed at the central portion of the chamber lid  130  and has an approximately cylindrical shape. The second gas distribution part  320  may be integrated with the chamber lid  130 . Alternatively, the second gas distribution part  320  and the chamber lid  130  are separately manufactured to couple the second gas distribution part to the chamber lid  130  at the lower central portion of the chamber lid  130 . A second gas injection hole  322  corresponding to the second inflow hole  612  of the chamber lid  130  is defined at an upper side of the second gas distribution part  320 . Also, at least one injection hole is defined at a lower side of the second gas distribution part  320 . Thus, the second gas distribution part  320  receives the second processing gas to eject the second processing gas toward a lower side thereof. Here, the second gas distribution part  320  ejects the second processing gas toward the central portion of the substrate seat unit  118 . That is, the second gas distribution part  320  ejects the second processing gas into a central space defined by the plurality of substrates  116  seated on the substrate seat unit  118 . 
     An inner surface of each of the plurality of first gas distribution part  310  contacts the second gas distribution part  320  and is fixed to a lower side of the chamber lid  130 . At least two or more first gas distribution parts  320  may be provided. When two first gas distribution parts  320  are provided, each of the two first gas distribution parts  320  has a semicircular shape. When three or more first gas distribution parts  320  are provided, each of the second gas distribution parts  320  has a fan shape in which an inner surface contacting the second gas distribution part  320  has a narrow width and is gradually widened in width toward the outside thereof. Also, when the plurality of first gas distribution part  310  is coupled to the chamber lid  130 , the first gas distribution part  310  does not contact an adjacent first gas distribution part  310  and is spaced a predetermined distance from the adjacent first gas distribution part  310 . Also, protrusions  314  may be longitudinally disposed on both side surfaces of the first gas distribution part  310 . Since the protrusions  314  are provided, the third gas distribution part  330  may be coupled between the first gas distribution parts  310 . One first source material injection hole  614  and at least one second source material ejection hole  615  are defined at an upper side of the first gas distribution part  310 . One first source material injection hole  614  and at least one second source material injection hole  615  correspond to the first inflow hole  611  and the second inflow hole  612  of the chamber lid  130 . Also, as described in the forgoing exemplary embodiments and shown in the drawings, the first gas distribution part  310  includes the first gas distribution plate  134 , the second gas distribution plate  136 , and the third gas distribution plate  138 , which are stacked with each other. The first, second, and third gas distribution plates  134 ,  136 , and  138  are separately manufactured, and then, they are stacked and coupled to each other. That is, the first, second, and third gas distribution plates  134 ,  136 , and  138  may be integrated in one body. Here, since the first, second, and third gas distribution plates  134 ,  136 , and  138  have the same structure and function as those described with reference to the drawings, the structure and function thereof will be omitted. 
     The third gas distribution part  330  has a bar shape having a predetermined width and thickness and a predetermined space therein. Grooves  332  are longitudinally defined in both side surfaces of the third gas distribution plate  330 . The protrusions  314  of the first gas distribution part  310  are inserted into the grooves  332  defined in both side surface of the third gas distribution plate  330 . Thus, the third gas distribution part  330  is inserted and coupled between two adjacent first gas distribution parts  310 . A fuzzy gas injection hole  616  is defined in an upper side of the third gas distribution part  330  to inject the fuzzy gas through the third inflow hole  613  of the chamber lid  130  and inject the fuzzy gas to the outside of the substrate seat unit  118 . To eject the fuzzy gas to the outside of the substrate seat unit  118 , an inject hole of the fuzzy gas injection part may be defined in an outer portion of a bottom surface facing a top surface in which the fuzzy gas injection hole  616  is defined or defined in an outer surface facing an inner surface corresponding to the second gas distribution part  320 . That is, when the injection hole is defined in the bottom surface, the injection holes may be defined in the bottom surface and a bottom surface disposed on a boundary of the outer surface. Also, a temperature meter  333  may be disposed on at least one third gas distribution part  330 , e.g., at least two third gas distribution parts  330  facing each other to measure a temperature within a processing chamber  112 . The temperature meter  333  may be disposed on the bottom surface of the third gas distribution part  330 . Also, a portion of the third gas distribution part  330  may be recessed, and the temperature meter  330  may be buried into the recessed portion. 
     In the gas distribution apparatus  114  in accordance with this exemplary embodiment, although four first gas distribution parts  310  and four third gas distribution parts disposed between the four first gas distribution parts  310  are illustrated as an example, the number of the first gas distribution part  310  may be changed in accordance with an inner size of the processing chamber  112  and the number of the substrate  116 . Also, since the plurality of first gas distribution parts is separable and couplable, the large-scaled gas distribution apparatus  114  in accordance with the tendency of the large-scaled processing chamber  112  may be further easily manufactured. 
     As shown in  FIG. 17 , the second gas distribution part  320  includes a central ejection nozzle  321 , an extension ejection nozzle  324 , and an extension path  323 . The central ejection nozzle  321  is disposed in a central region of the plurality of gas distribution parts  310 . The extension ejection nozzle  324  extends into a space between the first gas distribution parts  310 . The extension path  323  communicates with the central ejection nozzle  321  and the extension ejection nozzle  324  to receive the second processing gas. The first gas distribution parts  310  of this exemplary embodiment are disposed corresponding to the substrates  116 , respectively. Thus, the second processing gas may be ejected into a space between the first gas distribution parts  310  to supply the second processing gas into a space between the substrates  116 . Thus, the second processing gas that is not cooled may be further supplied onto the substrate  116 . As a result, decomposition efficiency of the second processing gas may be improved to increase thin film deposition efficiency. 
     As shown in  FIG. 18 , an external heating unit  340  for heating the second processing gas supplied into the second gas distribution part  320  may be further disposed outside the second gas distribution part  320 . An electrical heating device and an optical heating device may be used as the external heating unit  340 . Thus, the second processing gas may be heated to further improve the decomposition efficiency. 
     As shown in  FIG. 19 , the second gas distribution part  320  may include a plurality of central ejection nozzles  321 . Thus, the second processing gas may be effectively supplied to the central region of the substrate seat unit  118 . Also, the second gas distribution part  320  may further include a path change device  350  ejecting the second processing gas supplied from the second gas distribution part  320  toward the substrates  116 . The path change device  350  includes a fixed plate  351 , an extension path  352  extending from a central region of the fixed plate  351  toward the substrate seat unit  118 , and a path change nozzle  353  disposed at an end of the extension path  352 . Here, the fixed plate  351  collects the second processing gas ejected through the second gas distribution part  320 . In  FIG. 19 , a portion of the fixed plate  351  is connected and fixed to the first gas distribution part  310 . However, the present disclosure is not limited thereto. For example, the fixed plate  351  may be connected and fixed to the chamber lid  130 . The extension path  352  has a rod shape in which an end thereof is closed. Thus, the second processing gas supplied into the extension path  352  is ejected toward the substrates  116  through the path change nozzle  353  disposed around the end of the extension path  352 . That is, the second processing gas supplied from the second gas distribution part  320  is ejected in an approximately vertical direction with respect to the substrates  116 . Thus, the second processing gas is bumped against the substrate seat unit  118  once, and then, is spread in all directions (i.e., toward the substrates). However, in the modified example of this exemplary embodiment, the second processing gas is supplied to the inside (i.e., the extension path  352 ) of the path change device  350 . Since a lower surface of the extension path  352  is blocked, the second processing gas may be ejected in a direction parallel to the substrates  116  through the path change nozzle  353  disposed at a lateral surface of the extension path  352 . Thus, an ejection amount of the second processing gas ejected toward an upper space of the plurality of substrates  116  may be uniformly adjusted. 
     As shown in  FIG. 20 , an internal heating unit  360  may be further disposed in a lower region of the second gas distribution part  320  of an inner space of the processing chamber  112  to heat the second processing gas supplied from the second gas distribution part  320 . That is, the internal heating unit  360  may be disposed in a space between the second gas distribution part  320  and the path change device  350 . Here, an electrical heating device and an optical heating device may be used as the internal heating unit  360 . Thus, since the second processing gas ejected inside the processing chamber  112  through the second gas distribution part  320  is heated, the decomposition efficiency of the second processing gas may be further improved. 
     As shown in  FIG. 21 , a separate plasma generation device  370  generating plasma in a region of the processing chamber  112  below the second gas distribution part  320  may be further provided. The plasma generation device  370  includes an antenna  371  disposed in a space between the second gas distribution part  320  and the path change device  350  and a power supply part  372  supplying a plasma power to the antenna  371 . The second processing gas supplied from the second gas distribution part  320  may be ionized by the plasma. Since the second processing gas is ionized, the thin film deposition efficiency may be improved. A capacitive coupled plasma (CCP) method instead of the above-described inductively coupled plasma (ICP) method may be used. For this, a separate electrode may be disposed in a lower region of the second gas distribution part  320 . Also, a remote plasma method may be applicable. Thus, a device for changing the second processing gas supplied into the second gas distribution part  320  into plasma may be further provided. 
     As shown in  FIG. 22 , the first processing gas having a low decomposition temperature may be ejected into an inner space of the processing chamber  112  through the first gas distribution part  310 , and the second processing gas having a high decomposition temperature may be ejected into an inner space of the processing chamber  112  through the second gas distribution part  320 . That is, the processing gases may be respectively ejected into the separated spaces to deposit a thin film. Thus, it may prevent the first processing gas having the low decomposition temperature from being decomposed before the first processing gas is ejected into the inner space of the processing chamber  112 . Also, it may prevent the second processing gas having the high decomposition temperature from being ejected into the inner space of the processing chamber  112  in a state where the second processing gas is in a cooled state. 
     Also, although not shown, the first gas distribution part  310  may be integrated with the chamber lid  130 . That is, the first gas distribution part  310  may be disposed inside the chamber lid  130 . In the above-described descriptions, a semi-batch type apparatus for treating the plurality of substrates was mainly described. However, the present disclosure is not limited thereto. For example, the present disclosure may be applicable to an apparatus for treating a single substrate. In this case, the second gas distribution part ejecting the second processing gas into a peripheral region of the substrate may be disposed. 
     As shown in  FIG. 23 , an upwardly protruding protrusion  380  may be disposed in the central region of the substrate seat unit  118 . Here, the second gas distribution part  320  may have a thickness less than that of the first gas distribution part  310 . In this case, when the substrate seat unit  118  ascends, the protrusion  380  may be partially inserted into a lower side of the second gas distribution part  320  between the first gas distribution parts  310 . Thus, the second gas distribution part  380  ejects the second processing gas toward the protrusion  380 , and the flow direction of the second processing gas is changed by the protrusion  380  to flow toward the substrates  116 . 
     Compounds (GaN, Ga/IN/AlN, TiN, and Ti/AlN) containing two or more elements are deposited on the plurality of substrates at the same time using the substrate treating apparatus of this exemplary embodiment. In accordance with the thin film deposition process, a supply amount of the second processing gas supplied into the second gas distribution part  320  may be varied. For example, the supply of the second processing gas may be fully interrupted by the second gas distribution part  320 . This represents that the processing gas may be supplied using only at least one of the first gas distribution part  310  and the second gas distribution part  320 . The first gas distribution part  310  and the second gas distribution part  320  in according to the exemplary embodiments may be coupled and fixed to the chamber lid  130  except that the first gas distribution parts  310  are separated and coupled from/to each other. 
     The substrate treating apparatus including the gas distribution apparatus in accordance with the exemplary embodiments has the following effects. 
     In three gas distribution plates in which two processing gases are independently ejected at the same time, since a space in which the refrigerant flows is defined in the gas distribution plate including the nozzle for ejecting the processing gas onto the substrate, it may prevent particles from being generated by the decomposition of the processing gases and prevent the gas distribution apparatus from being thermally deformed. The two gas distribution plates are manufactured using the drilling or sheet metal forming process. Also, since only the gas distribution plate including the nozzle is manufactured using the brazing process, the simplified structure may be realized, and also the manufacturing coat may be reduced. 
     The temperature meter is disposed on the gas distribution plate including the nozzle to provide a signal by which the processing or substrate treating process are stopped when a temperature of the gas distribution plate increases over a predetermined temperature during the brazing or substrate treating process. Thus, since the processing or substrate treating process is automatically stopped by the signal, limitations occurring during the manufacturing process or substrate treating process may be prevented. 
     Also, since the processing gas having the high decomposition temperature is ejected into the space between the substrates, a travel time of the processing gas is greater than that of the processing gas in case where the processing gas is directly ejected on the substrates. Thus, the processing gas may be pre-heated within the processing chamber for a longer time to increase the decomposition of the processing gas having the high decomposition temperature, thereby reducing the usage of the processing gas and improving the thin film deposition efficiency. 
     Also, since the processing gas having the high decomposition temperature in the plurality of processing gases is ejected through a peripheral region of an ejection device except the ejection device having a cooling function, the processing gas having the high decomposition temperature may be ejected into the processing chamber (i.e., substrates) without cooling the processing gas. 
     Also, since the processing gas having the high decomposition temperature is ejected in the chamber lid region above the central portion of the substrate seat unit on which the plurality of substrates is seated, i.e., a region in which a temperature is relatively high in a gas ejection region, the usage of the processing gas may be reduced and the thin film deposition efficiency may be improved due to the pre-heating of the processing gas. 
     Also, the separate path change device may be disposed in a region in which the processing gas having high decomposition temperature is ejected to eject the processing gas toward the substrate. Thus, an amount of the processing gas supplied onto the substrate may be uniform. 
     Also, the second gas distribution part of the gas distribution apparatus may be divided in plurality, and the plurality of second gas distribution parts may be coupled and separated to/from each other. Thus, the large-scaled gas distribution apparatus in accordance with the tendency of the large-scaled processing chamber  112  may be further easily manufactured. 
     Although the gas distribution apparatus and substrate treating apparatus having the same has(have) been described with reference to the specific embodiments, it(they) is(are) not limited thereto. Therefore, it will be readily understood by those skilled in the art that various modifications and changes can be made thereto without departing from the spirit and scope of the present invention defined by the appended claims.