Patent Publication Number: US-2019186001-A1

Title: Thin Film Deposition Apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority from Korean Patent Application No. 10-2017-0174880, filed on Dec. 19, 2017, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     Apparatuses and methods consistent with the present disclosure relate to a thin film deposition apparatus, and more particularly, to a thin film deposition apparatus for minimizing generation of powder at a gas supply unit for supplying process gas when a thin film is deposited by atomic layer deposition (ALD). 
     RELATED ART 
     Technology such as chemical vapor deposition (CVD) and atomic layer deposition (ALD) has been used as a deposition method of forming a thin film on a substrate such as a semiconductor wafer (hereinafter referred to as a substrate). 
       FIG. 7  is a schematic diagram showing a basic concept of ALD of a thin film deposition method. Referring to  FIG. 7 , source gas including a source material such as trimethyaluminium (TMA) is supplied onto a substrate to adsorb source gas onto the substrate, inert purge gas such as argon (Ar) is supplied to exhaust source gas that is not adsorbed and, then, reaction gas including a reactant such as ozone (O 3 ) which reacts with the source material is supplied to form a single atomic layer (Al-O) on the substrate and exhaust an unreactive material and a byproduct by suppling inert purge gas. 
     A conventional thin film deposition apparatus used in ALD temporally or spatially separates source gas and reaction gas and supplies the gas toward a substrate. Therefrom, the method of temporally separating and supplying source gas and reaction gas requires a pumping time halfway to decrease a substrate throughput of a thin film deposition apparatus. 
     Accordingly, in consideration of the substrate throughput of the thin film deposition apparatus, the method of spatially separating and supplying source gas and reaction gas is advantageous. As such, an example of the method of spatially separating and supplying source gas and reaction gas is a scan type method in which a gas supply unit and a substrate are relatively moved with respect to each other. 
     However, even if source gas and reaction gas are spatially separated and supplied in the scan type method or the like, powder is generated from a parasitic reaction between source gas and reaction gas. The powder is mainly generated below a gas supply unit and, as a deposition process proceeds, the powder is accumulated below the gas supply unit. Accordingly, when the powder is dropped toward the substrate from the gas supply unit due to itself weight, the powder acts as a particle that contaminates a thin film. 
     SUMMARY 
     The present disclosure provides a thin film deposition apparatus for maintaining the excellent quality of the thin film while maintaining high substrate throughput when a thin film is deposited on a substrate by atomic layer deposition (ALD). 
     The present disclosure also provides a thin film deposition apparatus for preventing a parasitic reaction between source gas and reaction gas to a maximum degree to minimize generation of powder when a gas supply unit and a substrate are relatively moved with respect to each other by atomic layer deposition (ALD). 
     According to an aspect of the present disclosure, a thin film deposition apparatus may comprise a chamber providing a deposition space in which a thin film is deposited on a substrate, a gas supply unit including at least one gas supply module supplying source gas and reaction gas toward the substrate and exhausting remaining gas, and disposed in the deposition space and a substrate support unit which is disposed below the gas supply unit, on which the substrate is mounted, and which is relatively moved with respect to the gas supply unit, wherein the gas supply module includes a pair of source gas supply channels supplying source gas toward the substrate, a reaction gas supply channel spaced apart from the pair of source gas supply channels and supplying reaction gas toward the substrate, and a first exhaust channel disposed between the pair of source gas supply channels and exhausting remaining gas. 
     The gas supply module may further include a pair of first purge gas supply channels supplying purge gas toward the substrate and symmetrically disposed outside the pair of source gas supply channels. 
     An exhaust channel exhausting remaining gas may be not disposed between the pair of source gas supply channels and the pair of first purge gas supply channels, each adjacent to each other. 
     The gas supply module may further comprise a second exhaust channel disposed between the reaction gas supply channel and one of the pair of first purge gas supply channels. 
     The gas supply module may further comprise an additional exhaust channel disposed adjacent to at least one of both edges of the gas supply module. 
     The gas supply module may further comprise a purge gas supply channel disposed outside the additional exhaust channel. 
     The pair of source gas supply channels and the pair of first purge gas supply channels may be disposed at one side of the reaction gas supply channel, and a third exhaust channel and a second purge gas supply channel are further disposed at the other side of the reaction gas supply channel. 
     At least one of the pair of first purge gas supply channels and the second purge gas supply channel may have a greater width than the pair of source gas supply channels and the reaction gas supply channel. 
     The gas supply module may further comprise an additional exhaust channel disposed adjacent to at least one of both edges of the gas supply module. 
     The gas supply module may further comprise a third purge gas supply channel disposed between the reaction gas supply channel and one of the pair of first purge gas supply channel. 
     The gas supply module may further comprise a fourth exhaust channel disposed between the reaction gas supply channel and the third purge gas supply channel. 
     At least one of the pair of first purge gas supply channel, the second purge gas supply channel, and the third purge gas supply channel may have a greater width than the pair of source gas supply channel and the reaction gas supply channel. 
     The gas supply module may further comprise a guide member disposed at an end of at least one of the pair of source gas supply channels and guiding a supplying direction of the source gas. 
     The guide member may guide source gas supplied from the pair of source gas supply channels to be directed toward the first exhaust channel. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING FIGURES 
       The above and/or other aspects of the present disclosure will be more apparent by describing certain exemplary embodiments of the present disclosure with reference to the accompanying drawings, in which: 
         FIG. 1  is a lateral cross-sectional view showing an internal configuration of a thin film deposition apparatus according to an exemplary embodiment; 
         FIG. 2  is an enlarged cross-sectional view of a gas supply module according to an exemplary embodiment; 
         FIGS. 3 to 6  are lateral cross-sectional views showing a configuration of a gas supply module according to another exemplary embodiments; and 
         FIG. 7  is a schematic diagram showing a basic concept of a conventional atomic layer deposition (ALD) apparatus. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a thin film deposition apparatus according to various embodiments of the present disclosure will be described in greater detail with reference to the accompanying drawings. 
       FIG. 1  is a lateral cross-sectional view showing an internal configuration of a thin film deposition apparatus  1000  according to an exemplary embodiment. 
     Referring to  FIG. 1 , the thin film deposition apparatus  1000  may include a chamber  100  that provides a deposition space  102  in which a thin film is deposited on a substrate  10  and the substrate  10  is loaded to perform a deposition operation, and a substrate loading/unloading device (not shown) for loading and unloading of a substrate. Although not shown in the drawing, the thin film deposition apparatus  1000  may further include a load lock chamber that is connected to one side of the chamber  100  and is switchable to a vacuum or atmospheric pressure state, one or more boats on which a substrate to be deposited is accommodated, and one or more boats on which a completely deposited substrate is accommodated. 
     The thin film deposition apparatus  1000  may include the chamber  100  including the deposition space  102  in which a thin film is deposited on the substrate  10 , a substrate support unit  150  which is included in the chamber  100  and on which the substrate is mounted, and a gas supply unit  2000 . 
     Here, the gas supply unit  2000  may include at least one gas supply module  200  for supplying source gas and reaction gas toward the substrate  10  and exhausting the remaining gas and may be disposed in upper part of the deposition space  102 . 
     In this case, the gas supply unit  2000  may be spaced apart from the substrate support unit  150  by a predetermined distance and may be configured to be relatively moved with respect to the substrate support unit  150 . Furthermore, the thin film deposition apparatus  1000  may include a loading/unloading means of loading the substrate  10  into the chamber  100 , or unloading the substrate  10  from the chamber  100 . 
     The chamber  100  may provide a space in which the substrate  10  is loaded, a deposition operation or the like is performed on the substrate  10 , and various components are disposed. In addition, the chamber  100  may provide an environment in which a vacuum state is maintained therein by vacuum equipment such as a pump (not shown) for exhausting internal gas to perform a substrate processing operation such as a deposition operation or the like. 
     In detail, the chamber  100  may include the deposition space  102  disposed therein and may include a chamber body  130  with an open upper part and a chamber lid  120  for opening and closing the open upper part of the chamber body  130 . An opening  134  for loading and unloading of the substrate  10  into and out of the chamber  100  may be disposed at one side of the chamber body  130 . 
     The chamber lid  120  of the chamber  100  may include the gas supply unit  2000  for supplying at least one of source gas, reaction gas, and purge gas, which is described below in detail. 
     The substrate support unit  150  on which the substrate  10  is mounted may be included in the chamber  100 . The substrate support unit  150  may be configured to be relatively moved with respect to the aforementioned gas supply unit  2000 . That is, at least one of the substrate support unit  150  and the gas supply unit  2000  may be configured in such a way that at least one of the substrate support unit  150  and the gas supply unit  2000  is relatively moved along a straight-line path by a predetermined distance in a parallel to the other one of the substrate support unit  150  and the gas supply unit  2000 . When being relatively moved, the substrate support unit  150  and the gas supply unit  2000  may reciprocate along a predetermined straight-line path. 
     For example, when the gas supply unit  2000  disposed in upper part of the deposition space  102  sequentially supplies source gas, reaction gas, and the like, if the substrate support unit  150  reciprocates while being relatively moved below the gas supply unit  2000 , a thin film may be deposited on the substrate  10  at high deposition rate by source gas and reaction gas that are supplied by the gas supply unit  2000 . 
     In this case, both the gas supply unit  2000  and the substrate support unit  150  may be configured to be relatively moved or any one of the gas supply unit  2000  and the substrate support unit  150  may be relatively moved with respect to the other one. For example, the gas supply unit  2000  and the substrate support unit  150  may be configured in such a way that the aforementioned gas supply unit  2000  is fixed and the substrate support unit  150  is moved or both the substrate support unit  150  and the gas supply unit  2000  are moved. 
     A heater  170  for heating the substrate  10  may be disposed below the substrate support unit  150 . The heater  170  may be spaced apart from a bottom of the substrate support unit  150  for supporting the substrate  10  by a predetermined distance to heat the substrate  10 . 
     In detail, the heater  170  may be disposed along a moving path of the substrate support unit  150 . For example, the heater  170  may include at least one heating plate  172  and a support member  174  for supporting the heating plate  172 . The heating plate  172  may be disposed to be spaced apart from the substrate support unit  150  for supporting the substrate  10  by a predetermined distance to heat the substrate  10 . 
     Meanwhile, in exemplary embodiments, the heater  170  may be provided inside the substrate support unit  150 . 
     The gas supply unit  2000  may include at least one gas supply module  200  for supplying source gas and reaction gas toward the substrate  10  and exhausting the remaining gas and, in detail, may include the plurality of gas supply modules  200  disposed along a moving path of the substrate  10 . In this case, each of the gas supply modules  200  may supply source gas and reaction gas toward the substrate  10  and may exhaust the remaining gas. Accordingly, when the gas supply unit  2000  is configured, the plurality of gas supply modules  200  with the same configuration may be disposed to easily assemble the gas supply unit  2000 . In this case, when the gas supply unit  2000  is repaired in the future, only the corresponding gas supply module  200  may be repaired or replaced to enable easy and rapid maintenance. 
     When the gas supply module  200  sequentially supplies source gas and reaction gas to deposit a thin film by atomic layer deposition (ALD), source gas may be first adsorbed onto the substrate  10  and the source gas adsorbed onto the substrate  10  may react with reaction gas to deposit the thin film. However, when a parasitic reaction between source gas and reaction gas occurs in a remaining region except for the substrate  10  on which a thin film needs to be deposited, powder may be generated and deposited. In particular, the powder may be generated and deposited at the gas supply module for supplying source gas and reaction gas. 
     For example, source gas supplied from a source gas supply channel of the gas supply module may be spread to both directions of the source gas supply channel and may be exhausted through an exhaust channel In this case, reaction gas and purge gas may also be exhausted together by pumping of the exhaust channel. In this case, a portion of the reaction gas may be moved to the source gas supply channel due to a weakened gas curtain effect during exhausting of the purge gas to the exhaust channel Accordingly, the reaction gas and the source gas may react with each other to generate powder at an outer part of a lower portion of the source gas supply channel. 
     As subsequent processes may be repeatedly performed, an amount of the generated powder is increased and, thus, the powder is dropped toward a substrate due to itself weight and acts as a particle that degrades the quality of a thin film of a substrate. Hereinafter, a configuration of a gas supply module for preventing a parasitic reaction in a gas supply module for supplying source gas and reaction gas if possible and reducing generation and deposition of powder to deposit a thin film by atomic layer deposition (ALD) will be described. 
       FIG. 2  is an enlarged cross-sectional view of the gas supply unit  2000  of  FIG. 1  and a lateral cross-sectional view showing only one of a plurality of the supply modules  200  included in the gas supply unit  2000 . As described above, at least one of the substrate support unit  150  and the gas supply module  200  may be configured to be relatively moved in parallel to the other one of the substrate support unit  150  and the gas supply module  200  by a predetermined distance. 
     Referring to  FIG. 2 , the gas supply module  200  may include a cover  202 . 
     The cover  202  may be disposed above the gas supply module  200 . The gas supply module  200  may include various lines for supplying or exhausting source gas, reaction gas, or purge gas to various supply channels to be described below in detail and the various lines may be disposed in the cover  202 . 
     In detail, the gas supply module  200  may include a first supply line  410  for supplying source gas. The first supply line  410  may be connected to a source gas source (not shown) and may supply source gas to source gas supply channels  210 A and  210 B of the gas supply module  200  through the cover  202 . 
     The gas supply module  200  may further include a second supply line  430  for supplying reaction gas. The second supply line  430  may be connected to a reaction gas source (not shown) and may supply reaction gas to a reaction gas supply channel  220  through the cover  202 . 
     The gas supply module  200  may further include a third supply line  440  for supplying purge gas. The third supply line  440  may be connected to a purge gas source (not shown) and may supply purge gas to purge gas supply channels  250 A,  250 B, and  252  through the cover  202 . 
     The gas supply module  200  may include an exhaust line  420  disposed in the cover  202  to exhaust source gas, reaction gas, or purge gas, which is supplied from various supply channels. The exhaust line  420  may be connected to exhaust channels  230 ,  232 ,  234 ,  236 , and  238  and may exhaust the remaining gas inside the chamber  100  by pumping of a pumping member. 
     The gas supply module  200  may include various supply channels for supplying source gas, reaction gas, and/or purge gas. At least one supply channel may be disposed in the gas supply module  200 . 
     In detail, the gas supply module  200  may include the pair of source gas supply channels  210 A and  210 B for supplying source gas to the substrate  10 , and the reaction gas supply channel  220  that is spaced apart from the pair of source gas supply channels  210 A and  210 B to supply reaction gas to the substrate  10 . 
     The source gas supply channels  210 A and  210 B may supply source gas to the substrate  10  and the reaction gas supply channel  220  may be spaced apart from one side the source gas supply channels  210 A and  210 B by a predetermined distance to supply reaction gas toward the substrate  10 . 
     In this case, if the gas supply module  200  is configured in such a way that the source gas supply channels  210 A and  210 B and the reaction gas supply channel  220  are disposed adjacently to each other, a parasitic reaction between source gas and reaction gas may occur and, thus, the gas supply module  200  may be configured in such a way that the source gas supply channels  210 A and  210 B and the reaction gas supply channel  220  may be spaced apart from each other to a maximum distance. 
     For example, as shown in the drawing, the gas supply module  200  may be configured in such a way that source gas supply channels  210 A and  210 B and the reaction gas supply channel  220  are disposed at both sides of the gas supply module  200 , respectively. That is, the source gas supply channels  210 A and  210 B may be disposed at any one of the both sides of the gas supply module  200  and the reaction gas supply channel  220  may be disposed at the other one of the both sides of the gas supply module  200 , thereby maximizing a distance between the source gas supply channels  210 A and  210 B and the reaction gas supply channel  220 . 
     According to the present exemplary embodiment, the gas supply module  200  may include the first exhaust channel  230  between the pair of source gas supply channels  210 A and  210 B to exhaust the remaining gas. When the pair of source gas supply channels  210 A and  210 B are configured, the first exhaust channel  230  may be disposed between the source gas supply channels  210 A and  210 B. In this case, the source gas may be supplied toward the substrate  10  from the source gas supply channels  210 A and  210 B and, then, the source gas that is not adsorbed onto the substrate  10  may be exhausted by the first exhaust channel  230 . 
     In particular, according to the present exemplary embodiment the first exhaust channel  230  is disposed between the pair of source gas supply channels  210 A and  210 B for supplying the source gas and, thus, it may be possible to exhaust unreacted source gas that is supplied from the source gas supply channels  210 A and  210 B and does not participate in a reaction by pumping by the first exhaust channel  230  prior to being moved to the reaction gas supply channel  220 . Accordingly, the unreacted source gas that is not adsorbed onto the substrate  10  from the source gas supplied from the source gas supply channels  210 A and  210 B may be prevented from being moved toward the reaction gas supply channel  220  to reduce a parasitic reaction between the source gas and the reaction gas. 
     The gas supply module  200  may further include the pair of first purge gas supply channels  250 A and  250 B for supplying purge gas toward the substrate  10 . One of the pair of first purge gas supply channels  250 B may be disposed between one of the source gas supply channels  210 B and the reaction gas supply channel  220  to supply purge gas to prevent the source gas and the reaction gas from meeting, thereby reducing a parasitic reaction. 
     In detail, the gas supply module  200  may include the pair of first purge gas supply channels  250 A and  250 B for supplying purge gas. In this case, the pair of source gas supply channels  210 A and  210 B and the pair of first purge gas supply channels  250 A and  250 B may be adjacently disposed to each other. 
     That is, source gas supplied from the source gas supply channels  210 A and  210 B may be prevented from being moved to the reaction gas supply channel  220  to reduce a parasitic reaction by purge gas supplied by the pair of first purge gas supply channels  250 A and  250 B. 
     In this case, the pair of first purge gas supply channels  250 A and  250 B may be symmetrically disposed outside the pair of source gas supply channels  210 A and  210 B. 
     That is, the aforementioned first exhaust channel  230  may be disposed between the pair of source gas supply channels  210 A and  210 B and the first purge gas supply channels  250 A and  250 B may be symmetrically disposed outside the pair of source gas supply channels  210 A and  210 B, respectively. 
     Accordingly, unreacted source gas that is supplied from the source gas supply channels  210 A and  210 B and does not participates in a reaction may be exhausted by the first exhaust channel  230  disposed at a central parts between the pair of source gas supply channels  210 A and  210 B. In this case, purge gas supplied from the pair of first purge gas supply channels  250 A and  250 B disposed at an outer part of the pair of source gas supply channels  210 A and  210 B may function as a kind of gas curtain to prevent the source gas from being spread to both sides of the source gas supply channels  210 A and  210 B. 
     When the pair of first purge gas supply channels  250 A and  250 B are symmetrically disposed outside the pair of source gas supply channels  210 A and  210 B as described above, there may be no exhaust channel for exhausting the remaining gas between the pair of source gas supply channels  210 A and  210 B and the pair of first purge gas supply channels  250 A and  250 B, each adjacent to each other. 
     If the exhaust channel for exhausting the remaining gas is present between the source gas supply channels  210 A and  210 B and the first purge gas supply channels  250 A and  250 B, source gas supplied from the source gas supply channels  210 A and  210 B may be exhausted and reaction gas supplied from the reaction gas supply channel  220  may also be pumped and exhausted together. In this case, a parasitic reaction between source gas and reaction gas may occur in the exhaust channel presented between the source gas supply channels  210 A and  210 B and the first purge gas supply channels  250 A and  250 B to generate powder. Accordingly, according to the present exemplary embodiment, the exhaust channel for exhausting the remaining gas may not be present between the source gas supply channels  210 A and  210 B and the first purge gas supply channels  250 A and  250 B and, thus, source gas supplied to the source gas supply channels  210 A and  210 B may be prevented from being spread to both sides and meeting reaction gas, thereby preventing a parasitic reaction therebetween to a maximum. 
     Furthermore, the exhaust channel for exhausting the remaining gas may not be present between the source gas supply channels  210 A and  210 B and the first purge gas supply channels  250 A and  250 B and, thus, the gas supply module  200  may be compact 
     The gas supply module  200  may include the reaction gas supply channel  220  that is spaced apart from the aforementioned pair of source gas supply channels  210 A and  210 B to supply reaction gas. 
     In this case, the pair of first purge gas supply channels  250 A and  250 B may be symmetrically disposed outside the pair of source gas supply channels  210 A and  210 B, respectively, and the second exhaust channel  232  may be disposed between the reaction gas supply channel  220  and one the pair of first purge gas supply channels  250 A and  250 B. 
     That is, the second exhaust channel  232  may be further disposed between one of the pair of first purge gas supply channel  250 A and  250 B and the reaction gas supply channel  220 . Accordingly, source gas that is supplied from one of the source gas supply channels  210 B and passes through a lower portion of one of the first purge gas supply channels  250 B may be exhausted prior to reaching the reaction gas supply channel  220 . 
     As described above, when the pair of source gas supply channels  210 A and  210 B and the pair of first purge gas supply channels  250 A and  250 B are disposed at one side of the reaction gas supply channel  220 , the third exhaust channel  234  may be further disposed at the other side of the reaction gas supply channel  220 . 
     In this case, as shown in the drawing, the third exhaust channel  234  may correspond to an exhaust channel disposed on the right side of the reaction gas supply channel  220 . In this case, the third exhaust channel  234  may be disposed between the reaction gas supply channel  220  and a source gas supply channel (not shown) of another gas supply module (not shown) disposed on the right side of the gas supply module  200 . Accordingly, a parasitic reaction between source gas and reaction gas may be prevented by the third exhaust channel  234 . 
     When the third exhaust channel  234  is omitted, the exhaust channel  236  shown at the outermost of the left side of the gas supply module  200  may perform a similar function to that of the omitted third exhaust channel  234 . That is, if another gas supply module (not shown) is disposed on the left side of the gas supply module  200 , an exhaust channel may be formed between the source gas supply channel  210 A of the gas supply module  200  and a reaction gas supply channel of a gas supply module that is not shown to prevent a parasitic reaction. 
     As a result, an additional exhaust channel may be disposed adjacent to at least one of both edges of the gas supply module  200  and, in this case, the additional exhaust channel may correspond to the third exhaust channel  234  or the exhaust channel  236  shown at the outermost of the left side of the gas supply module  200 . 
     The second purge gas supply channel  252  may be further disposed outside the third exhaust channel  234 . The second purge gas supply channel  252  may be disposed between the reaction gas supply channel  220  and a source gas supply channel (not shown) of another gas supply module (not shown) disposed on the right side of the gas supply module  200 . Accordingly, a parasitic reaction between source gas and reaction gas may be prevented by the second purge gas supply channel  252 . 
     When the second purge gas supply channel  252  is omitted, the first purge gas supply channel  250 A disposed on the left side among the pair of first purge gas supply channels  250 A and  250 B may perform a similar function to the omitted second purge gas supply channel  252 . That is, if another gas supply module (not shown) is disposed on the left side of the gas supply module  200 , the first purge gas supply channel  250 A may be formed between the source gas supply channel  210 A of the gas supply module  200  and a reaction gas supply channel of a gas supply module that is not shown to prevent a parasitic reaction. 
     As a result, the gas supply module  200  according to the present exemplary embodiment may be configured in such a way that relatively many purge gas supply channels are disposed between the reaction gas supply channel and the source gas supply channel in one gas supply module  200 , compared with a conventional device. In addition, when the gas supply modules  200  according to the present exemplary embodiment are consecutively disposed, relatively many purge gas supply channels may also be disposed between a reaction gas supply channel of any one of the gas supply modules  200  and a source gas supply channel of another gas supply module. In the case of this configuration, a parasitic reaction between source gas and reaction gas may be prevented by a gas curtain effect of purge gas supplied from the purge gas supply channel. 
     As illustrated in  FIG. 1 , the gas supply unit  2000  of the thin film deposition apparatus  1000  according to the present disclosure may include the plurality of gas supply modules  200  which are installed in upper part of the deposition space  102  of the chamber  100  along a moving path of the substrate  10 . That is, a gas supply module that is not shown in the drawing with the same configuration may be disposed on the right side of the gas supply module  200  shown in  FIG. 2 . 
     In this case, a parasitic reaction between reaction gas supplied from the reaction gas supply channel  220  of the gas supply module  200  that is shown in the drawing and source gas supplied from a source gas supply channel of a gas supply module that is not shown in the drawing may occur. 
     Accordingly, to prevent such a parasitic reaction, the third exhaust channel  234  and the second purge gas supply channel  252  may be disposed at the right side of the reaction gas supply channel  220 . Reaction gas that is supplied from the reaction gas supply channel  220  and does not participate in a reaction may be exhausted through the third exhaust channel  234 . In addition, purge gas supplied from the second purge gas supply channel  252  may act as a gas curtain to prevent a parasitic reaction between reaction gas and source gas. 
     The gas supply module  200  may include an additional exhaust channel disposed adjacent to at least one of both edges. 
     As shown in  FIG. 2 , the additional exhaust channel may correspond to an exhaust channel denoted by ‘ 236 ’ and ‘ 238 ’ or, when the second purge gas supply channel  252  is omitted, the additional exhaust channel may correspond to the exhaust channel denoted by ‘ 236 ’ and ‘ 234 ’. 
     As such, the additional exhaust channel may be disposed adjacent to at least one of the both edges of the gas supply module  200 , thereby preventing a parasitic reaction between source gas or reaction gas supplied from a gas supply module (not shown) that is to neighbor both sides of the gas supply module  200  and reaction gas or source gas supplied from the gas supply module  200 . 
     When a thin film is deposited on the substrate  10  by atomic layer deposition (ALD), a gas activation unit  300  for activating reaction gas may be disposed at the reaction gas supply channel  220 . 
     The gas activation unit  300  described in the present embodiment may activate reaction gas to supply the reaction gas in an activated atom or radical. Here, the gas activation unit  300  may be provided in any one form of a plasma generation unit, a super high frequency generation unit, an ultraviolet irradiation unit, and a laser irradiation unit. 
     For example, when the gas activation unit  300  is configured in the form of a high frequency generation unit, the high frequency generation unit may activate reaction gas using a high frequency equal to or greater than  10   9  Hz. When the high frequency generation unit applies a high frequency, the reaction gas may be changed to an activated atom or radical state and may be supplied toward the substrate  10 . 
     When the gas activation unit  300  is configured in the form of an ultraviolet irradiation unit, reaction gas may be changed to an activated atom or radical state by ultraviolet rays emitted by the ultraviolet irradiation unit and may be supplied toward the substrate  10 . 
     When the gas activation unit  300  is configured in the form of a laser irradiation unit, reaction gas may be changed to an activated atom or radical state by laser beams emitted by the laser irradiation unit and may be supplied toward the substrate  10 . 
     Hereinafter, a detailed description will be given assuming that the gas activation unit  300  is a plasma generation unit. When the gas activation unit  300  includes a plasma generation unit, a power electrode  310  supplied with power may be disposed to one side internal wall  314  of the reaction gas supply channel  220  and the other side internal wall  316  of the reaction gas supply channel  220  may be grounded to function as a ground electrode. In this case, a shield member  312  may be disposed at the one side internal wall  314  of the reaction gas supply channel  220  and may support the power electrode  310 . The shield member  312  may electrically separate the power electrode  310  and the gas supply module  200  to electrically shield the power electrode  310  from the gas supply module  200 . In this case, the shield member  312  may electrically shied the power electrode  310  and may also function as a support for supporting the power electrode  310 . 
       FIG. 3  is a lateral cross-sectional view showing a configuration of a gas supply module  200 ′ according to another exemplary embodiment. In the exemplary embodiment shown in  FIG. 3 , the same reference numeral may be denoted for the same component as in the exemplary embodiment shown in  FIG. 2 . 
     Referring to  FIG. 3 , the gas supply module  200 ′ according to the present exemplary embodiment may further include a third purge gas supply channel  254  between the reaction gas supply channel  220  and the first purge gas supply channel  250 B. 
     In  FIG. 3 , the aforementioned second exhaust channel  232  may be disposed on the left side of the third purge gas supply channel  254  and a fourth exhaust channel  239  may be disposed between the third purge gas supply channel  254  and the reaction gas supply channel  220 . 
     In this case, compared with the exemplary embodiment shown in  FIG. 2 , a distance between the source gas supply channels  210 A and  210 B and the reaction gas supply channel  220  may be further increased. In addition, an effect of a gas curtain may be further enhanced by purge gas supplied from the third purge gas supply channel  254 . The fourth exhaust channel  239  may be further included to more effectively exhaust the remaining gas. Accordingly, a parasitic reaction between source gas supplied from the source gas supply channels  210 A and  210 B and reaction gas supplied from the reaction gas supply channel  220  may be prevented. 
     The other components except for the aforementioned components of  FIG. 3  have been described above with reference to  FIG. 2  and, thus, a repeated description is omitted. 
       FIG. 4  is a lateral cross-sectional view showing a configuration of a gas supply module  200 ″ according to another exemplary embodiment. 
     Referring to  FIG. 4 , compared with the exemplary embodiment of  FIG. 2 , the gas supply module  200 ″ according to the present exemplary embodiment may be configured in such a way that at least one of the pair of first purge gas supply channels  250 A and  250 B and the second purge gas supply channel  252  has a greater width than the pair of source gas supply channels  210 A and  210 B and the reaction gas supply channel  220 . 
     For example, a width W 1  of the pair of first purge gas supply channels  250 A and  250 B may be greater than a width W 2  of the pair of source gas supply channels  210 A and  210 B and a width W 3  of the reaction gas supply channel  220 . 
     In this case, a distance between the source gas supply channels  210 A and  210 B and the reaction gas supply channel  220  may be increased and a width of purge gas supplied from the pair of first purge gas supply channels  250 A and  250 B may be increased to enhance an effect of a gas curtain compared with the exemplary embodiments of  FIGS. 1 and 1 . As a pressure of purge gas supplied from the pair of first purge gas supply channels  250 A and  250 B is increased, the effect of a gas curtain may be further enhanced. Although not shown in the drawing, a width of at least one of various exhaust channels such as the first exhaust channel  230 , the second exhaust channel  232 , the third exhaust channel  234 , the additional exhaust channels  236  and  238  may be increased or a pumping capacity may be increased and, thus, a parasitic reaction between source gas supplied from the source gas supply channels  210 A and  210 B and reaction gas supplied from the reaction gas supply channel  220  may be prevented. 
     Although  FIG. 4  shows the case in which the width W 1  of the pair of first purge gas supply channels  250 A and  250 B is relatively wide, the present disclosure is not limited thereto. Alternatively, the width of the second purge gas supply channel  252  may also be relatively wide or the widths of the pair of first purge gas supply channels  250 A and  250 B and the second purge gas supply channel  252  may also be wide. 
     The other components except for the aforementioned components of  FIG. 4  have been described above with reference to  FIG. 2  and, thus, a repeated description is omitted. 
       FIG. 5  is a lateral cross-sectional view showing a configuration of a gas supply module  200 ″′ according to another exemplary embodiment. 
     Referring to  FIG. 5 , compared with the exemplary embodiment of  FIG. 3 , the gas supply module  200 ″′ according to the present exemplary embodiment may be configured in such a way that a width of at least one of the pair of first purge gas supply channels  250 A and  250 B, the second purge gas supply channel  252 , and the third purge gas supply channel  254  has a greater width than the pair of source gas supply channels  210 A and  210 B and the reaction gas supply channel  220 . 
     For example, the width W 1  of the pair of first purge gas supply channels  250 A and  250 B may be wider than the width W 2  of the pair of source gas supply channels  210 A and  210 B and the width W 3  of the reaction gas supply channel  220 . 
     The width W 4  of the third purge gas supply channel  254  may also be wider than the width W 2  of the source gas supply channels  210 A and  210 B and the width W 3  of the reaction gas supply channel  220 . 
     In this case, compared with the exemplary embodiment of  FIG. 3 , a distance between the source gas supply channels  210 A and  210 B and the reaction gas supply channel  220  may be further increased and a width of purge gas supplied from the pair of first purge gas supply channels  250 A and  250 B may be increased to further enhance an effect of a gas curtain. As a pressure of purge gas supplied from the pair of first purge gas supply channels  250 A and  250 B, the second purge gas supply channel  252 , or the third purge gas supply channel  254  is increased, the effect of the gas curtain of the purge gas may be further enhanced. Although not shown in the drawing, a width of at least one of various exhaust channels such as the first exhaust channel  230 , the second exhaust channel  232 , the third exhaust channel  234 , and the additional exhaust channels  236  and  238  may be increased or a pumping capacity may be increased and, thus, parasitic reaction between source gas supplied from the source gas supply channels  210 A and  210 B and reaction gas supplied from the reaction gas supply channel  220  may be prevented to a maximum. 
     Although  FIG. 5  shows the case in which the width of the pair of first purge gas supply channels  250 A and  250 B and the third purge gas supply channel  254  is relatively wide, the present disclosure is not limited thereto. Alternatively, the width of the second purge gas supply channel  252  may also be relatively wide or the widths of all purge gas supply channels may also be wide. 
     The other components except for the aforementioned components of  FIG. 5  have been described above with reference to  FIG. 3  and, thus, a repeated description is omitted. 
       FIG. 6  is a lateral cross-sectional view showing the gas supply module  200  according to another exemplary embodiment. 
     Referring to  FIG. 6 , compared with the exemplary embodiment of  FIG. 2 , the gas supply module  200 ″′ according to the present exemplary embodiment may further include guide members  610 A and  610 B disposed at an end of at least one of the pair of source gas supply channels  210 A and  210 B to guide a supply direction of the source gas. 
     As described above, the gas supply module  200  according to the present disclosure may be provided to prevent a parasitic reaction between source gas supplied from the source gas supply channels  210 A and  210 B and reaction gas supplied from the reaction gas supply channel  220 . To this end, the source gas supplied from the source gas supply channels  210 A and  210 B may not be moved to the reaction gas supply channel  220 , and a distance between the source gas supply channels  210 A and  210 B and the reaction gas supply channel  220  may also be increased to a maximum degree. 
     According to the present exemplary embodiment, the gas supply module  200 ″′ may include guide members  610 A and  610 B for preventing source gas supplied from the pair of source gas supply channels  210 A and  210 B from being moved to the reaction gas supply channel  220  and directing the source gas toward the first exhaust channel  230 . 
     In detail, the guide members  610 A and  610 B may be formed to be directed toward the first exhaust channel  230  from an end of both external walls  212  and  214  of the pair of source gas supply channels  210 A and  210 B. Accordingly, source gas supplied from the pair of source gas supply channels  210 A and  210 B may be supplied toward the first exhaust channel  230  and may be adsorbed onto the substrate  10 , and source gas that is not adsorbed onto the substrate  10  may be exhausted through the first exhaust channel  230  to prevent a parasitic reaction with reaction gas. 
     Although  FIG. 6  shows the case in which the guide member  610  protrudes downward from an end of the both external walls  212  and  214  of the pair of source gas supply channels  210 A and  210 B, the guide member  610  is not limited thereto. For example, the guide member  610  may protrude inward from an inside of the both external walls  212  and  214  or the pair of source gas supply channels  210 A and  210 B may also be inclined with respect to each other to function as a guide member 
     The aforementioned guide members  610 A and  610 B may also be applied to a structure of the gas supply module  200 ′,  200 ″,  200 ″′ according to the exemplary embodiments of  FIGS. 3 to 5 . 
     According to the present disclosure with the aforementioned configuration, when a gas supply unit and a substrate are relatively moved with respect to each other by atomic layer deposition (ALD), a parasitic reaction between source gas and reaction gas may be prevented to a maximum degree to reduce generation of powders that are the cause of a particle. 
     Accordingly, according to the present disclosure, when a thin film is deposited on a substrate by ALD, the excellent quality of the thin film may be maintained while maintaining high substrate throughput. 
     The foregoing exemplary embodiments and advantages are merely exemplary and are not to be construed as limiting the present disclosure. The present teaching can be readily applied to other types of apparatuses. Also, the description of the exemplary embodiments of the present disclosure is intended to be illustrative, and not to limit the scope of the claims, and many alternatives, modifications, and variations will be apparent to those skilled in the art.