Abstract:
There is provided a chemical vapor deposition apparatus including: a chamber including a reactor where a deposition object is deposited; a first supplier including a plurality of gas pipes allowing a first gas to be jetted into the reactor in a substantially horizontal direction; a second supplier including a plurality of holes of a predetermined size having the gas pipes inserted therein, respectively; a supply flow path formed between each of the gas pipes and each of the holes, the supply flow path allowing a second gas to be supplied into the reactor in a substantially horizontal direction.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the priority of Korean Patent Application No. 2008-36095 filed on Apr. 18, 2008, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a chemical vapor deposition apparatus, and more particularly, to a chemical vapor deposition apparatus structured such that a reaction gas is jetted with higher efficiency. 
         [0004]    2. Description of the Related Art 
         [0005]    In general, chemical vapor deposition (CVD) is a process in which a reaction gas fed into a reaction chamber reacts chemically on a top surface of a heated wafer to grow a thin film. This thin film growth method ensures crystals to be grown with better quality than a liquid phase growth. However, disadvantageously, the crystals are grown at a relatively slow rate. A widely used method for overcoming this drawback is to grow the crystals on several substrates simultaneously in one growth cycle. 
         [0006]    A conventional chemical vapor deposition apparatus includes a reaction chamber having an inner space of a predetermined size, a susceptor installed in the inner space to mount a wafer as the deposition object thereon, a heater disposed adjacent to the susceptor to apply predetermined heat, and a gas supplier jetting a reaction gas into the reaction chamber to allow the wafer to be deposited. 
         [0007]    A reaction gas necessary for chemical vapor deposition includes a combination of various gases, some of which chemically react before being fed into the reaction chamber in a mixed state. Therefore, it may be undesirable to mix various gases into a reaction gas and supply the reaction gas to the reaction chamber at one time. 
         [0008]    Consequently, the reaction gas fed into the reaction chamber may be separated into at least two to be fed into the reaction chamber individually such that the gases are mixed together inside the reactor. 
         [0009]    However, conventionally, in order to supply such separate gases into the reactor individually, separate structures for gas supply should be provided. However, this causes the reaction gas to be supplied in a very limited amount at one time and renders the reaction gases supplied separately hardly miscible with each other. 
       SUMMARY OF THE INVENTION 
       [0010]    An aspect of the present invention provides a chemical vapor deposition apparatus which overcomes spatial limitation caused by supplying separate gases individually not to react in advance, but allows the gases to be supplied separately in a great amount at one time and the supplied gases to be mixed fast inside the chamber, thereby ensuring deposition is performed with better reliability. 
         [0011]    According to an aspect of the present invention, there is provided a chemical vapor deposition apparatus including: a chamber including a reactor where a deposition object is deposited; a first supplier including a plurality of gas pipes allowing a first gas to be jetted into the reactor in a substantially horizontal direction; a second supplier including a plurality of holes of a predetermined size having the gas pipes inserted therein, respectively; a supply flow path formed between each of the gas pipes and each of the holes, the supply flow path allowing a second gas to be supplied into the reactor in a substantially horizontal direction. 
         [0012]    The chemical vapor deposition apparatus may further include an outlet opening provided in a center of the reactor to exhaust a reaction gas, wherein the reactor is provided at an outer edge thereof with the first and second suppliers. 
         [0013]    The chemical vapor deposition apparatus may further include a first gas room provided between a side end portion of the chamber and the first supplier disposed inward from the side end portion of the chamber to have a predetermined gap therebetween. 
         [0014]    The chemical vapor deposition apparatus may include a second gas room provided between the first supplier and the second supplier disposed inward from the first supplier to have a predetermined gap therebetween. 
         [0015]    The first and second gas rooms may be separated from each other by the first supplier. 
         [0016]    The supply flow path may be defined by a gap of a predetermined size between an inner surface of the hole and an outer surface of the gas pipe. 
         [0017]    The chemical vapor deposition apparatus may further include a third supplier disposed between the first and second suppliers, wherein the second gas room is formed between the third supplier and the second supplier and the third gas room is formed between the third supplier and the first supplier. 
         [0018]    The third supplier may include a plurality of supply pipes hollowed to have the gas pipes inserted therein, each of the supply pipes allowing a third gas of the third gas room to be introduced to the reactor by keeping the third gas room and the reactor in communication with each other. 
         [0019]    The supply flow path may include: a first supply flow path formed between the each of the holes and each of the supply pipes to allow a second gas of the second gas room to be supplied, and a second supply flow path formed between the supply pipe and the gas pipe to allow the third gas of the gas room to be supplied. 
         [0020]    The first supply flow path may be defined by a gap of a predetermined size between an inner surface of the hole and an outer surface of the supply pipe, and the second supply flow path is defined by a gap of a predetermined size between an inner surface of the supply pipe and an outer surface of the gas pipe. 
         [0021]    The chemical vapor deposition apparatus may further include a plurality of outlet openings at an outer edge of the reactor to exhaust a reaction gas, wherein the reactor is provided in a center thereof with the first and second suppliers. 
         [0022]    The chemical vapor deposition apparatus may further include a first gas room disposed inward from the first supplier. 
         [0023]    The chemical vapor deposition apparatus may further include a second gas room formed between the first and second suppliers, the second supplier surrounding the first supplier to have a predetermined gap therebetween. 
         [0024]    The supply flow path may be defined by a gap of a predetermined size between an inner surface of the hole and an outer surface of the gas pipe. 
         [0025]    The flow path may be defined by a gap of a predetermined size between an inner surface of the holes and an outer surface of the gas pipes. 
         [0026]    The chemical vapor deposition apparatus may further include a third supplier disposed between the first and second suppliers, wherein the second gas room is formed between the third supplier and the second supplier and the third gas room is formed between the third supplier and the first supplier. 
         [0027]    The third supplier may include a plurality of supply pipes hollowed to have the gas pipes inserted therein, each of the supply pipes allowing a third gas of the third gas room to be introduced to the reactor by keeping the third gas room and the reactor in communication with each other. 
         [0028]    The supply flow path may include: a first supply flow path formed between the each of the holes and each of the supply pipes to allow a second gas of the second gas room to be supplied, and a second supply flow path formed between the supply pipe and the gas pipe to allow the third gas of the gas room to be supplied. 
         [0029]    The first supply flow path may be defined by a gap of a predetermined size between an inner surface of the hole and an outer surface of the supply pipe, and the second supply flow path is defined by a gap of a predetermined size between an inner surface of the supply pipe and an outer surface of the gas pipe. 
         [0030]    The chemical vapor deposition apparatus may further include: a first inlet formed in communication with the first gas room and allowing the first gas to be fed to the first gas room, and a second inlet surrounding the first inlet to have a predetermined gap therebetween, the second inlet allowing the second gas to be fed to the second gas room through the gap with the first inlet. 
         [0031]    The first inlet may be formed integral with the first supplier and the second inlet is formed integral with the second supplier. 
         [0032]    The chemical vapor deposition apparatus may further include: a first inlet formed in communication with the first gas room and allowing the first gas to be fed to the first gas room, a second inlet surrounding the first inlet to have a predetermined gap therebetween, the second inlet formed in communication with the second gas room to allow the second gas to be fed to the second gas room, and a third inlet inserted with a predetermined gap from the second inlet and surrounding the first inlet to have a predetermined gap therebetween, the third inlet allowing the third gas to be fed to the third gas room through the gap with the first inlet. 
         [0033]    The first inlet may be formed integral with the first supplier, the second inlet is formed integral with the second supplier and the third inlet is formed integral with the third supplier. 
         [0034]    The chemical vapor deposition apparatus may further include: a susceptor accommodating the deposition object inside the chamber; and a rotational axis passing through the first gas room to rotate the susceptor. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         [0035]    The above and other aspects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
           [0036]      FIG. 1  is a side cross-sectional perspective view illustrating a chemical vapor deposition apparatus according to an exemplary embodiment of the invention; 
           [0037]      FIG. 2  is a detailed magnified view illustrating an A portion shown in  FIG. 1 ; 
           [0038]      FIG. 3  is a view illustrating an A portion shown in  FIG. 1  having a different structure according to an exemplary embodiment of the invention; 
           [0039]      FIG. 4  is a side cross-sectional view illustrating a chemical vapor deposition apparatus according to another exemplary embodiment of the invention; 
           [0040]      FIG. 5  is a detailed magnified view illustrating a B portion shown in  FIG. 4 ; and 
           [0041]      FIG. 6  is a view illustrating a B portion shown in  FIG. 4  having a different structure according to an exemplary embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0042]    Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 
         [0043]    First, referring to  FIG. 1 , a general structure of a chemical vapor deposition apparatus according to an exemplary embodiment of the invention will be described.  FIG. 1  is a side cross-sectional perspective view illustrating a chemical vapor deposition apparatus according to an exemplary embodiment of the invention. 
         [0044]    As shown in  FIG. 1 , the chemical vapor deposition apparatus of the present embodiment includes a chamber  10  where a reactor  20  is disposed, a susceptor  11  disposed inside the reactor  20 , deposition objects  12  placed on the susceptor  11  and a heater  13  provided at a predetermined distance from a bottom end of the susceptor  11 . 
         [0045]    The reactor  20  provided inside the chamber  10  has an inner space of a predetermined space so that a reaction gas fed into the reactor chemically reacts with the deposition objects. The reactor may be provided on an inner surface thereof with a heat insulating material to withstand a high temperature atmosphere. 
         [0046]    The susceptor  11  as a supporting structure has at least one pocket on a top surface thereof to mount a corresponding one of the deposition objects  12  thereon and is disposed in the reactor  20 . 
         [0047]    The susceptor  11  is formed of graphite in a substantially disc shape. The susceptor has a driving motor and a rotational axis joined to each other in a central portion of a bottom surface thereof so as to be rotated at a predetermined rate. 
         [0048]    The heater  13  is disposed adjacent to the susceptor  11  and applies heat toward the susceptor  11  to heat the deposition objects  12 . This heater  130  includes an electric heater, a high frequency inductor, an infrared radiator, a laser and the like. 
         [0049]    Also, as shown in  FIG. 1 , the chemical vapor deposition apparatus of the present embodiment includes a first supplier  31  and a second supplier  32  formed on an outer side of the reactor  20  to supply a first gas and a second gas into the reactor  20 , respectively. 
         [0050]    A first gas room  41  and a second gas room  42  are disposed inward from a side end portion of the chamber  10 . The first gas room  41  is provided between the side end portion of the chamber  10  and the first supplier  31  and the second gas room  42  is provided between the first supplier  31  and the second supplier  32 . 
         [0051]    That is, the first supplier  31  and the second supplier  32  formed inward from the side end portion of the chamber  10  separate the first gas room  41  and the second gas  42  from each other to have a predetermined gap therebetween in a vertical direction. 
         [0052]    As shown in  FIG. 1 , the first supplier  31  and the second supplier  32  may be sequentially disposed in a circumferential direction along the reactor  20 . 
         [0053]    Also, the chemical vapor deposition apparatus of the present embodiment includes a first inlet  51  guiding the first gas to the first gas room  41  and a second inlet  52  guiding the second gas to the second gas room  42 . 
         [0054]    The first gas introduced to the first gas room  41  and the second gas introduced to the second gas room  42  may include gases of different kinds, or gases of partially identical kinds. 
         [0055]    Moreover, the first inlet  51  may be formed of a singular one or at least two. That is, at least two first inlets may be disposed with a predetermined gap therebetween to allow the first gas to be introduced to the first gas room  41  simultaneously. This ensures the gas to be fed into the reactor more uniformly. 
         [0056]    Likewise, the second inlet  52  maybe formed of a singular one or at least two. The second inlet  52  formed of at least two allows the second gas to be fed into the reactor  20  more uniformly. 
         [0057]    Meanwhile, as shown in  FIG. 1 , the chemical vapor deposition apparatus of the present embodiment includes an outlet opening  14  formed in a center of the reactor  20  to exhaust a reaction gas, and exhaust pipes  15  formed to allow the gas to be exhausted through the outlet opening  14 . 
         [0058]    Therefore, the chemical vapor deposition apparatus according to the present embodiment shown in  FIG. 1  is structured such that the reaction gas is jetted in a centripetal direction and exhausted through the outlet opening  14  formed in the center of the reactor  20 . 
         [0059]    Meanwhile, referring to  FIG. 2 , a detailed description will be given of major features of the chemical vapor deposition apparatus of the present embodiment shown in  FIG. 1 .  FIG. 2  is a magnified view of an A portion shown in  FIG. 1 . 
         [0060]    As shown in  FIG. 2 , in the chemical vapor deposition apparatus of the present embodiment, the first supplier  31  includes a plurality of gas pipes  31   a  through which the first gas room  41  and the reactor  20  are in communication with each other. 
         [0061]    The gas pipes  31   a  may be formed integral with the first supplier  31 . Alternatively, the gas pipes  31   a  alone may be manufactured to be joined to the first supplier  31 . 
         [0062]    A gas flow path P 1  is formed in a center of each of the gas pipes to be in communication with the first gas room  41  so that the first gas can flow to the reactor  20  therethrough. 
         [0063]    Also, the second supplier  32  is provided with a plurality of holes  32   a  of a predetermined size into which the gas pipes  31   a  are inserted. The holes  32   a  are substantially identical in number to the gas pipes  31   a.    
         [0064]    Each of the holes  32   a  should have a diameter greater than a diameter of each of the gas pipes  31   a.  As shown in FIG.  2 , a supply flow path P 2  may be formed between an inner surface of the hole  32   a  and an outer surface of the gas pipe  31   a  to be in communication with the second gas room  42  so that the second gas can flow to the reactor  20  therethrough. 
         [0065]    Also, to separate the first gas room  41  and the second gas room  42  substantially from each other, the gas pipe  31   a  may have a length identical to or greater than a length that covers a width of the second gas room  42  and a thickness of the hole  32   a  of the second supplier  32 . 
         [0066]    Moreover, to ensure the first gas supplied from the reactor  20  through the gas pipe  32   a  to be easily mixed with the second gas supplied through the supply flow path P 2 , the gas pipe  31   a  may have a length substantially identical to a length that covers a width of the second gas room  42  and a thickness of the hole  32   a  of the second supplier  32 . 
         [0067]    Meanwhile, a chemical vapor deposition apparatus will be described according to another exemplary embodiment of the invention. 
         [0068]    In the present embodiment, the structures of a chamber  10  where a reactor  20  is provided, a susceptor  11 , a heater  13  and an outlet opening  14  are substantially identical to the embodiment shown in  FIG. 1 , and thus will not be described in further detail. 
         [0069]    The present embodiment is different from the embodiment shown in  FIGS. 1 and 2  in the supply structure of the reaction gas, which will be described in more detail with reference to  FIG. 3 . 
         [0070]    As shown in  FIG. 3 , a first supplier  31  and a second supplier  32  are formed on an outer side of the reactor  20 . Here, the first and second suppliers  31  and  32  are sequentially disposed inward from a side end portion of the chamber and a third supplier  33  is disposed between the first and second suppliers  31  and  33 . 
         [0071]    A first gas room  41  is formed between the first supplier  31  and the side end portion of the chamber  10 . A third gas room  43  is formed between the first supplier  31  and the third supplier  33 , and a second gas room  42  is formed between the third supplier  33  and the second supplier  32 . 
         [0072]    The first gas room  41  is connected to a first inlet  51  so that the first gas is introduced through the first inlet  51 . The second gas room  42  is connected to a second inlet  52  so that the second gas is introduced through the second inlet  52 . The third gas room  43  is connected to a third inlet  53  so that a third gas is introduced through the third inlet  53 . Like the first inlet  51  and the second inlet  52 , the third inlet  53  may be formed of a singular one or at least two. 
         [0073]    The first, second and third gases may be formed of different gases from one another but may contain partially identical gas components. 
         [0074]    The first supplier  31  is provided with gas pipes  31   a , the third supplier  33  is provided with supply pipes  33   a  and the second supplier  32  is provided with holes  32   a.    
         [0075]    The gas pipes  31   a  maybe formed integrally with or joined to the first supplier  31 . The supply pipes  33   a  may be formed integrally with or joined to the third supplier  33 . 
         [0076]    Each of the gas pipes  31   a  may have a diameter smaller than a diameter of each of the supply pipes  33   a.  The gas pipes  31   a  are inserted into the supply pipes  33   a  to have a predetermined gap therebetween. 
         [0077]    Moreover, the supply pipes  33   a  having the gas pipes  31   a  inserted thereinto are inserted in the holes  32   a.  Here, an outer surface of the supply pipe  33   a  and an inner surface of the hole  32   a  may have a gap of a predetermined size therebetween. 
         [0078]    Here, the chemical vapor deposition apparatus of the present embodiment includes a first supply flow path P 2  defined by the gap between the hole  32   a  and the supply pipe  33   a  and a second supply flow path P 3  defined by the gap between the gas pipe  31   a  and the supply pipe  33   a.    
         [0079]    P 1  indicated in  FIG. 3  denotes a gas flow path passing through the gas pipe  31   a.    
         [0080]    The gas flow path P keeps the first gas room  41  and the reactor  20  in communication with each other so that the first gas can flow to the reactor  20 . The first supply flow path P 2  keeps the second gas room  42  and the reactor  20  in communication with each other so that the second gas can flow to the reactor  20 . The second supply flow path P 3  keeps the third gas room  43  and the reactor  20  in communication with each other so that the third gas can flow to the reactor  20 . 
         [0081]    To ensure formation of the gas flow path P 1  and the supply flow paths P 2  and P 3 , separation of the first gas room  41 , the second gas room  42  and the third gas room  43  from one another, and easy mixture of gases, the gas pipe  31   a  may have a length substantially identical to a length that covers a sum of a width of the second gas room  42  and a thickness of the third supplier  33 , and a sum of a width of the second gas room  42  and a thickness of the second supplier  32 , respectively. Also, the supply pipe  33   a  has a length substantially identical to a length that covers a sum of a width of the second gas room  42  and a thickness of the second supplier  32 . 
         [0082]    That is, an end portion of the hole  32   a  leading to the reactor  20 , an end portion of the supply pipe  33   a  leading to the reactor  20  and an end portion of the gas pipe  31   a  leading to the reactor may be located at substantially identical positions. 
         [0083]    Hereinafter, a chemical vapor deposition apparatus will be described with reference to  FIG. 4  according to another exemplary embodiment of the invention.  FIG. 4  is a side cross-sectional perspective view illustrating a chemical vapor deposition apparatus according to another exemplary embodiment of the invention. 
         [0084]    As shown in  FIG. 4 , the chemical vapor deposition apparatus according to the present embodiment includes a chamber where a reactor  20  is provided, a susceptor  11  disposed inside the reactor  20 , a deposition object  12  placed on the susceptor  11 , and a heater  13  disposed below the susceptor  11 . 
         [0085]    Also, a first supplier  31  and a second supplier  32  are provided in a center of the reactor  20  to supply a reaction gas. In the present embodiment, the first supplier  31  is inserted into the second supplier  32  to have a predetermined gap therebetween. 
         [0086]    A first gas room  41  and a second gas room  42  are formed outward from the center of the reactor  20 . The first gas room  41  is located near the center of the reactor  20  and the second gas room  42  is located more outward. The first gas room  41  is provided in a hollow inner space of the first supplier  31  and the second gas room  42  is provided in the gap between the first supplier  31  and the second supplier  32 . 
         [0087]    That is, the first supplier  31  and the second supplier  32  are formed outward from the center of the reactor  20  to have a predetermined gap therebetween in a vertical direction to form the first gas room  41  and the second gas room  42 , respectively. 
         [0088]    As shown in  FIG. 4 , the first supplier  31  and the second supplier  32  may be formed in a cylindrical shape in the center of the second supplier  32 . 
         [0089]    Also, a first inlet  51  is provided to introduce a first gas to the first gas room  41  and a second inlet  52  is provided to introduce a second gas to the second gas room  42 . 
         [0090]    Here, the first inlet  51  can be joined to or formed integrally with the first supplier  31  and the second inlet  52  can be joined to or formed integrally with the second supplier  32 . 
         [0091]    The first gas introduced to the first gas room  41  and the second gas introduced to the second gas room  42  contain gases of different kinds from each other, but may contain gases of partially identical kinds. 
         [0092]    Meanwhile, as shown in  FIG. 4 , in the chemical vapor deposition apparatus of the present embodiment, a plurality of holes  16  are provided at a side end portion of the chamber  10  to exhaust the reaction gas therethrough. 
         [0093]    Accordingly, the chemical vapor deposition apparatus of the present embodiment shown in  FIG. 4  is structured such that the reaction gas is jetted in a centrifugal direction, i.e., radially and exhausted through the exhaust holes  16 . 
         [0094]    The chemical vapor deposition apparatus of the present embodiment shown in  FIG. 4  includes a rotational axis  60  passing through the first gas room  41  formed between the side end portion of the chamber  10  and the first supplier  31  and then joined to the susceptor  11 . The rotational axis  60  transfers a rotational force for rotating the susceptor  11 . 
         [0095]    Meanwhile, with reference to  FIG. 5 , major features of the chemical vapor deposition apparatus of the present embodiment shown in  FIG. 5  will be described in more detail.  FIG. 5  is a magnified view of a B portion shown in  FIG. 4 . 
         [0096]    As shown in  FIG. 5 , in the chemical vapor deposition apparatus of the present embodiment, the first supplier  31  includes a plurality of gas pipes  31   a  through which the first gas room  41  and the reactor  20  are in communication with each other. 
         [0097]    The gas pipes  31   a  can be formed integrally with the first supplier  31 . Alternatively, the gas pipes  31   a  alone may be manufactured to be joined to the first supplier  31 . 
         [0098]    A gas flow path P 1  is formed in a center of each of the gas pipes  31   a  to be in communication with the first gas room  41  so that the first gas can flow to the reactor  20 . 
         [0099]    Also, the second supplier  32  includes a plurality of holes  32   a  of a predetermined size into which the gas pipes  31   a  are inserted. The number of holes  32   a  may be substantially identical to the number of the gas pipes  31   a.    
         [0100]    Each of the holes  32   a  should have a diameter greater than a diameter of each of the gas pipes  31   a.  As shown in  FIG. 2 , a supply flow path P 2  may be formed between an inner surface of the hole  32   a  and an outer surface of the gas pipe  31   a  to be in communication with the second gas room  42  so that the second gas can flow to the reactor. 
         [0101]    To substantially separate the first gas room  41  and the second gas room  42  from each other, the gas pipe  31   a  may have a length substantially identical to or greater than a length that covers a sum of a width of the second gas room  42  and a thickness of the hole  32   a  of the second supplier  32 . 
         [0102]    Moreover, to ensure the first gas fed from the reactor  20  through the gas pipe  32   a  to be easily mixed with the second gas fed through the supply flow path P 2 , the gas pipe  31   a  may have a length substantially identical to a length that covers a sum of a width of the second gas room  42  and a thickness of the hole  32   a  of the second supplier  32 . 
         [0103]    Hereinafter, a chemical vapor deposition apparatus according to still another exemplary embodiment of the invention will be described with reference to  FIG. 6 . 
         [0104]    The present embodiment is substantially identical to the embodiment shown in  FIG. 4  when it comes to the structures of a chamber  10  where a reactor  20  is provided, a susceptor  11 , a heater  13  and an outlet opening  14 , and thus such structures will not be described in further detail. 
         [0105]    However, the present embodiment is different from the present embodiment shown in  FIGS. 4 and 5  in a supply structure of a reaction gas, which will be described in more detail with reference to  FIG. 6 . 
         [0106]    As shown in  FIG. 6 , a first supplier  31  and a second supplier  32  are disposed outward from a center of the reactor  20 , and a third supplier  33  is formed therebetween. 
         [0107]    That is, the third supplier  33  is inserted into the second supplier  32  to have a predetermined gap therebetween and the first supplier  31  is inserted into the third supplier  33  to have a predetermined gap therebetween. 
         [0108]    A first gas room  41  is defined by a hollow inner space of the first supplier  31  and a third gas room  43  is formed between the first supplier  31  and the third supplier  33 . Also, a second gas room  42  is formed between the third supplier  33  and the second supplier  32 . 
         [0109]    Therefore, the first supplier  31 , the second supplier  32 , and the third supplier  33  may be formed in a cylindrical shape. The third supplier  33  should have a diameter greater than a diameter of the first supplier  31  and be sized such that the third gas room  43  can be formed between the third supplier  33  and the first supplier  31 . 
         [0110]    Moreover, the second supplier  32  should have a diameter greater than a diameter of the third supplier  33  and be sized such that the second gas room  42  is formed between the second supplier  32  and the third supplier  33 . 
         [0111]    The first gas room  41  is connected to the first inlet  51  so that the first gas is fed through the first inlet  51 . The second gas room  42  is connected to the second inlet  52  so that the second gas is fed through the second inlet  52 . The third gas room  43  is connected to the third inlet  53  so that the third gas is fed through the third inlet  53 . 
         [0112]    Here, the first inlet  51 , the second inlet  52  and the third inlet  53  are formed integral with the first supplier  31 , the second supplier  32  and the third supplier  33 , respectively. Alternatively, the first, second and third inlets  51 ,  52 , and  53  may be joined to the first, second and third suppliers  31 ,  32  and  33 , respectively. 
         [0113]    The first gas, the second gas and the third gas may include gases of different kinds from one another, or partially identical gas components. 
         [0114]    Meanwhile, a gas pipe  31   a  is provided in the first supplier  31  and a supply pipe  33   a  is provided in the third supplier  33 . Also, a hole  32   a  is formed in the second supplier  32 . 
         [0115]    The gas pipe  31   a  may be formed integral with or joined to the first supplier  31 . The supply pipe  33   a  may be formed integral with or joined to the third supplier  33 . 
         [0116]    The gas pipe  31   a  may have a diameter smaller than the supply pipe  33   a.  The gas pipe  31   a  is inserted into the supply pipe  33   a  to have a predetermined gap therebetween. 
         [0117]    Also, the supply pipe  33   a  having the gas pipe  31   a  inserted thereinto is inserted into the hole  32   a  to have a gap of a predetermined size between an outer surface of the supply pipe  33   a  and an inner surface of the hole  32   a.    
         [0118]    Here, the chemical vapor deposition apparatus of the present embodiment includes a first supply flow path P 2  defined by the gap between the hole  32   a  and the supply pipe  33   a,  and a second supply flow path P 3  defined by the gap between the gas pipe  31   a  and the supply pipe  33   a.    
         [0119]    P 1  indicated in  FIG. 6  denotes a gas flow path passing through the gas pipe  31   a.    
         [0120]    The gas flow path P 1  keeps the first gas room  41  in communication with the reactor  20  so that the first gas flows to the reactor  20 . The first supply flow path P 2  keeps the second gas room  42  in communication with the reactor  20  so that the second gas flows to the reactor  20 . The second supply flow path P 3  keeps the third gas room  43  in communication with the reactor  20  so that the third gas flows to the reactor  20 . 
         [0121]    To ensure formation of the gas flow path P 1  and the supply flow paths P 2  and P 3 , separation of the first gas room  41 , the second gas room  42  and the third gas room  43  from one another, and easy mixture of gases, the gas pipe  31   a  may have a length substantially identical to a length that covers a sum of a width of the second gas room  42  and a thickness of the third supplier  33 , and a sum of a width of the second gas room  42  and a thickness of the second supplier  32 , respectively. Also, the supply pipe  33   a  may have a length substantially identical to a length that covers a sum of a width of the second gas room  42  and a thickness of the second supplier  32 . 
         [0122]    That is, an end portion of the hole  32   a  near the reactor  20 , an end portion of the supply pipe  33   a  near the reactor  20 , and an end portion of the gas pipe  31   a  near the reactor  20  may be located at substantially identical positions. 
         [0123]    As set forth above, according to exemplary embodiments of the invention, in a chemical vapor deposition apparatus, separate gases are fed into a chamber individually. However, the apparatus overcomes a spatial limitation to allow the separate gases to be supplied in a great amount at one time. Also, the gases supplied are mixed fast to ensure more reliable deposition. 
         [0124]    While the present invention has been shown and described in connection with the exemplary embodiments, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the invention as defined by the appended claims.