Patent Publication Number: US-2015083331-A1

Title: Process Chamber, Semiconductor Manufacturing Apparatus and Substrate Processing Method Having the Same

Description:
This application is a continuation of U.S. patent application Ser. No. 13/049,743, filed Mar. 16, 2011, pending, which claims the benefit of Korean Patent Application Nos. 10-2010-0024019, filed on Mar. 18, 2010, and 10-2010-0079066, filed on Aug. 17, 2010, which are hereby incorporated by reference as if fully set forth herein. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a semiconductor manufacturing apparatus, and more particularly, to a process chamber to process substrates, such as semiconductor devices, and an apparatus and method to transfer the substrates between chambers. 
     2. Discussion of the Related Art 
     In general, in order to manufacture semiconductor devices, flat display devices and solar cells, a thin film deposition process in which a thin film formed of a specific material is deposited on the surface of a wafer or glass, a photolithography process in which selected regions of the thin film are exposed or shielded using a photosensitive material, and an etching process in which the thin film is desirably patterned by removing the thin film from the selected regions are required. 
     Further, in order to perform the above processes, the thin film deposition process, the etching process, etc. are respectively carried out in a plurality of process chambers. Transfer of substrates between the plural process chambers is carried out via a transfer chamber. 
     The above conventional process chambers and a semiconductor manufacturing apparatus having the same have problems, as follows. 
     Each of the respective process chambers processes one substrate. Therefore, after one substrate is transferred to one process chamber and the substrate is processed under a vacuum atmosphere in the process chamber, the substrate must be transferred to another process chamber. Thereby, productivity is lowered. 
     That is, whenever one substrate is transferred to one process chamber, the process chamber needs to be operated, and whenever one substrate enters or exits the process chamber, an entrance of the process chamber needs to be opened and closed and the vacuum atmosphere in the process chamber needs to be formed again. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention is directed to a process chamber, a semiconductor manufacturing apparatus and a substrate processing method having the same. 
     An object of the present invention is to provide a process chamber to process substrates, such as semiconductor devices, and an apparatus and method to transfer the substrates between chambers. 
     Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings. 
     To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a process chamber includes a chamber provided with a substrate entrance formed on a side surface thereof, a substrate support provided within the chamber such that at least two substrates are disposed on the substrate support, and at least one divider provided within the chamber to align the at least two substrates. 
     Each of the at least one divider may include a support member to support parts of the edges of the at least two substrates and a separation member contacting the at least two substrates to separate the at least two substrates from each other. 
     The at least one divider may include a divider having a rectilinear shape to divide and align a pair of substrates facing each other, or include two dividers having a rectilinear shape which cross each other to divide and align four substrates. 
     The at least one divider may have a line width of 4˜60 mm. 
     The at least one divider may align the at least two substrates at the same height. 
     The at least one divider may be formed of a ceramic or anodizing coated aluminum. 
     The substrate support may include at least one of a loading frame to support the outermost regions of the lower surfaces of the at least two substrates and pins to support the central regions of the lower surfaces of the at least two substrates. 
     In another aspect of the present invention, a semiconductor manufacturing apparatus includes a transfer chamber provided with a substrate moving device to move substrates, a load lock chamber to align the substrates and to load and unload the substrates into and out of the transfer chamber, and at least one process chamber to process the substrates transferred from the transfer chambers, wherein each of the at least one process chamber includes a chamber provided with a substrate entrance formed on a side surface thereof, a substrate support provided within the chamber such that at least two substrates are disposed on the substrate support, and at least one divider provided within the chamber to align the at least two substrates. 
     The semiconductor manufacturing apparatus may further include alignment members provided in the load lock chamber to align the substrates. 
     The alignment members may be provided at least two corners of a support on which the substrates are seated. 
     Two substrates facing each other may be provided within the load lock chamber, and the alignment members may include stationary members or rotary members provided between the two substrates. 
     Four substrates may be provided within the load lock chamber, and the alignment members may include a pair of alignment members having a rectangular shape, crossing each other and provided at the center of the four substrates where the four substrates meet 
     The pair of alignment members may include at least four rotary members respectively provided between the four substrates and the four substrates are aligned by rotation of the rotary members. 
     The alignment members within the load lock chamber and the at least one divider within the process chamber may align the substrates in the same pattern. 
     In a further aspect of the present invention, a substrate processing method includes sequentially loading at least two substrates into a first chamber provided with alignment members, aligning corners of the at least two substrates using the alignment members, conveying the at least two substrates from the first chamber to a second chamber using a substrate conveyor unit, and conveying the at least two substrates from the second chamber to a third chamber using the substrate conveyor unit, wherein the at least two substrates are loaded in the third chamber in the same pattern as an aligned pattern of the at least two substrates within the first chamber. 
     At least one divider may divide and align the at least two substrates at the same height by a predetermined interval within the third chamber. 
     It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings: 
         FIGS. 1A to 1F  are views illustrating process chambers in accordance with embodiments of the present invention; 
         FIGS. 2A and 2B  are views illustrating substrates loaded on a substrate support of  FIG. 1A ; 
         FIG. 3  is a view illustrating a semiconductor manufacturing apparatus in accordance with one embodiment of the present invention; 
         FIG. 4  is a view illustrating alignment of substrates in a load lock chamber of  FIG. 3 ; 
         FIGS. 5A to 5F  are views illustrating alignment members of  FIG. 4  in accordance with embodiments of the present invention; 
         FIGS. 6 and 7  are views illustrating a substrate moving device in accordance with one embodiment of the present invention; and 
         FIG. 8  is a view illustrating a semiconductor manufacturing apparatus in accordance with another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. 
     In the accompanying drawings, the thicknesses of several layers and regions are exaggerated for clarity. A thickness ratio between the respective layers in the drawings does not represent an actual thickness ratio. 
       FIGS. 1A to 1F  are views illustrating process chambers in accordance with embodiments of the present invention and  FIGS. 2A and 2B  are views illustrating substrates loaded on a substrate support of  FIG. 1A . Hereinafter, a process chamber in accordance with one embodiment of the present invention will be described with reference to  FIG. 1A  and  FIGS. 2A and 2B . 
     In this embodiment, a plurality of substrates  16  is simultaneously loaded in the process chamber, and a process, such as deposition of a semiconductor layer on the plurality of substrates  16 , is carried out at one time. 
       FIG. 1A  illustrates the inside of the process chamber, and four substrates  16  are provided in a chamber  10 . Here, the respective substrates  16  are loaded on a substrate support within the chamber  10 . 
     The substrate support includes a loading frame  12  and pins  14 . The loading frame  12  supports surfaces of the respective substrates  16  facing the chamber  10 . That is, assuming that the four substrates  16  are regarded as one substrate, the loading frame  12  supports the edge of the substrate. 
     Further, the pins  14  support the edge of the respective substrates  16  facing dividers  40 . That is, if the respective substrates  16  have a rectangular cross-section, two sides of each of the substrates  16  facing the chamber  10  are supported by the loading frame  12  and the remaining two sides of each of the substrates  16  are supported by the pins  14 . 
     The substrates  16  may be supported by the loading frame  12  alone or the pins  14  alone. Here, the loading frame  12  or the pins  14  need to be provided so as to support all the edges of the four substrates  16 . 
     Further, the four substrates  16  are divided by the dividers  40 . Here, if the four substrates  16  are provided in the process chamber, the dividers  40  are provided such that the dividers  40  having a rectilinear shape cross each other so as to divide the four substrates  16  from each other. That is, when the dividers  40  divide the four substrates  16 , the dividers  40  are formed in a shape similar to a cross. 
       FIG. 2A  illustrates the substrates  16  loaded on the substrate support  12  and  14  of  FIG. 1A . The substrates  16  are supported by a susceptor  50 , and the loading frame  12  supports only the edges of the substrates  16 . 
       FIG. 2B  is an enlarged view of the portion D of  FIG. 2A . 
     The dividers  40  divide and align the substrates  16  while directly contacting the substrates  16 . Each of the dividers  40  includes a support member  40   a  and a separation member  40   b . The support member  40   a  supports parts of the edges of the substrates  16  and the separation member  40   b  separates the substrates  16  from each other so that the neighboring substrates  16  do not contact each other. Here, the separation member  40   b  has a trapezoidal shape, and reduces an area directly contacting the substrates  16  while separating the substrates  16  from each other, thereby preventing damage to the substrates  16 . 
     Here, the neighboring substrates  16  are separated from each other at least by a width T 1  of the lower side of the separation member  40   b . In this embodiment, the neighboring substrates  16  are separated from each other by 4-60 mm. That is, if the divider  40  has a bilaterally symmetrical structure, the substrates  16  are separated from the center of the divider  40  by at least 2-30 mm, thereby preventing interference generated between the respective substrates  16  in the process chamber. 
     Further, since the substrates  16  are supported by the support member  40   a  of the same divider  40 , the substrates  16  may be supported at the same height. 
     That is, since a margin allowing the neighboring substrates  16  to be loaded on a robot is 4 mm, if the separation member  40   b  of the divider  40  has a width of less than 4 mm, the neighboring substrates  16  collide with each other due to lack of the margin, when the substrates  16  are loaded on the susceptor  50 , thus being damaged. Further, the area of part of the substrates  16  loaded on the dividers  40  is increased, and the parts of the substrates  16  loaded on the dividers  40  are made of an ungrounded insulator, and thus uniformity of a thin film formed on the substrates  16  may be lowered. 
     Further, for example, during a thin film deposition process, the separation member  40   b  of the divider  40  allows the thin film formed on the neighboring substrates  16  not to be connected and prevents the susceptor  50  supporting the substrates  16  from being exposed to plasma, thereby allowing a desired thickness of the thin film to be deposited on the substrates  16 . 
     On the other hand, if the separation member  40   b  of the divider  40  has a width of more than 60 mm, space utility is not sufficient in consideration of the restricted space within the chamber  10 . That is, when a line width of the dividers  40  is increased, the area of the susceptor  50  is also increased. 
     Further, when the line width of the separation members  40   b  of the dividers is increased, the substrates  16  may be loaded on the susceptor  50  alone. In this case, when the susceptor  50  are exposed to plasma, arcing of the susceptor  50  may occur, and the plasma may be deposited on the susceptor  50  and thus the substrates  16  may not be effectively aligned during subsequent substrate processing. 
     Preferably, the dividers  40  do not react with plasma and an etchant during processes, such as the thin film deposition process and the etching process. In this embodiment, the dividers  40  are formed of an insulator, such as a ceramic or anodizing coated aluminum. Since the susceptor  50  is grounded, when the area of the dividers  40  formed of the insulator is increased, the area of regions in which plasma is not generated is increased. Thus, generated lower plasma density is achieved and uniformity of the thin film to be formed may be lowered. 
     Since the dividers  40  have only a height enough to exhibit the above-described effects, the separation members  40   b  of the dividers  40  may have a difference of ±10 mm or less with a height of the neighboring substrates  16 . 
       FIG. 1B  illustrates the process chamber in accordance with the embodiment shown in  FIG. 1A  under the condition that the chamber  10  is closed after the substrates are loaded in the chamber  10 . That is,  FIG. 1A  illustrates the process chamber in which arms  22  of a substrate conveyor unit  20  transfer the substrates  16  to the inside of the chamber  10 , and  FIG. 1B  illustrates the process chamber in which a valve  30  closes the chamber  10  after the substrates  16  are loaded on the substrate support. 
     Here, the valve  30  includes a valve housing and a blade moving in the valve housing to open and close an opening on the valve housing. 
     The process chamber in accordance with another embodiment shown in  FIG. 1C  is similar to the process chamber in accordance with the former embodiment of  FIG. 1B  except that two substrates  16  are loaded in one chamber  10  of the process chamber in accordance with this embodiment of  FIG. 1C . As shown in  FIG. 1C , one divider  40  having a rectilinear shape so as to divide the two substrates  16  from each other is provided. A line width and a height of the divider  40  is the same as those of the dividers  40  in accordance with the former embodiment. Surfaces of the two substrates  16  facing each other are supported by pins  14 , in the same manner as the former embodiment. 
       FIGS. 1D to 1E  illustrate a process chamber in accordance with another embodiment in which substrates  16  are supported by pins  14  alone without the loading frame  12  shown in  FIGS. 1A to 1C . 
     That is,  FIG. 1D  illustrates the process chamber in which the pins  14  are provided along the edges of the respective substrates  16  in a chamber  10  so as to support the substrates  16 , and  FIG. 1E  illustrates the process chamber in which the chamber  10  is closed after the substrates  16  are loaded on the chamber  10  of  FIG. 1D . 
     Further,  FIG. 1F  illustrates a process chamber in accordance with another embodiment in which two substrates  16  are provided in one chamber  10  and pins  14  supports the edges of the respective substrates  16 . That is, assuming that the process chamber is a chamber having a size of 8.5G (2,200 mm*2,600 mm), which can enable processing of large substrates, used in a plasma enhanced chemical vapor deposition (PECVD), the process chamber in accordance with the embodiment shown in  FIG. 1A  may load and process four substrates having a size of 5G (1,100 mm*1,300 mm) at a time, and the process chamber in accordance with the embodiment shown in  FIG. 1C  may load and process two larger substrates at a time. 
     Further, the process chambers in accordance with above embodiments may load and process other substrates having different sizes and provided in different numbers from those of the above substrates at a time. Here, the dividers  40  may be provided so as to divide or isolate the respective substrates from each other. 
       FIG. 3  is a view illustrating a semiconductor manufacturing apparatus in accordance with one embodiment of the present invention,  FIG. 4  is a view illustrating alignment of substrates in a load lock chamber of  FIG. 3 , and  FIGS. 5A to 5F  are views illustrating alignment members of  FIG. 4  in accordance with embodiments of the present invention. Hereinafter, the semiconductor manufacturing apparatus in accordance with this embodiment will be described with reference to  FIGS. 3 to 5F . 
     The semiconductor manufacturing apparatus in accordance with this embodiment includes the above-described process chamber. That is, the semiconductor manufacturing apparatus includes a load lock chamber LC, a transfer chamber TC, and the process chamber PC, and gates  100  and  110  are provided between the respective chambers. 
     The load lock chamber LC loads substrates S from the outside into the transfer chamber TC, and unloads substrates supplied from the transfer chamber TC to the outside. Further, the transfer chamber TC is provided with a substrate moving device  120  to move substrates S within the transfer chamber TC, thereby transferring the substrates S to other chambers. Here, arms  125  connected to the substrate moving device  120  support the substrates S during fixing and transferring of the substrates S. 
     More specifically, the process chamber PC has the same configuration as the process chamber in accordance with the embodiment of  FIG. 1A  and  FIGS. 2A and 2B . That is, the process chamber PC includes a chamber provided with a substrate entrance formed on one side surface thereof, and dividers provided in the chamber to divide plural substrates from each other, and performs processing of the substrates. 
     Therefore, the dividers in the process chamber PC having a rectilinear shape cross each other so as to divide the four substrates from each other, and are formed of a ceramic or anodizing coated aluminum. 
     Further, the process chamber PC includes a substrate supporter including a loading frame to support surfaces of the substrates facing the chamber and pins to support surfaces of the substrates facing the dividers in the same manner as the process chamber in accordance with the embodiment of  FIG. 1A  and  FIGS. 2A and 2B . 
     Alignment members are provided in the load lock chamber LC, thus performing alignment of the substrates S. That is, when the substrates are supplied from the outside to the load lock chamber LC, the load lock chamber LC performs alignment of the substrates S using the alignment members and then supplies the substrates to the transfer chamber TC. 
     That is, when four substrates S are supplied to the process chamber PC, the four substrates S must be aligned by the dividers and be then loaded. However, alignment of the substrates S within the process chamber PC is not desirable in view of process efficiency, and opening of the process chamber PC for a long time is not desirable in consideration of a subsequent deposition process. 
     Here, the process chamber PC may perform processes, such as a deposition process, a washing process, a preliminary heating process, a drying process, a heat treatment process, a photolithography process, an etching process, a diffusion process and an ion implantation process, on the respective substrates S transferred from the transfer chamber TC. As will be described later, a plurality of process chambers may be provided. 
     Therefore, the load lock chamber LC aligns the substrates S and then supplies the substrates S to the transfer chamber TC in the direction A, and the transfer chamber TC supplies the substrates T to the process chamber in the direction C. 
     Here, the substrates S within the transfer chamber TC may horizontally move in the direction B. The transfer chamber TC itself does not move but the substrate moving device  120  and the arms  125  move so as to move the substrates S. 
     That is, as shown in  FIG. 3 , the substrate moving device  120  may move in the direction B and the arms  125  may move in the direction A and the direction C. Further, although  FIG. 3  illustrates one process chamber PC alone, an array of process chambers PC may be provided so as to continuously perform plural processes and such a structure will be described later with reference to  FIG. 8 . 
       FIG. 4  is a view illustrating the inside of the load lock chamber LC to display alignment of the substrates S in detail. 
     In  FIG. 4 , the load lock chamber LC includes a body  150  in which the substrates S are provided, and the alignment members to align the substrates S. Here, four substrates S are provided within the load lock chamber LC, and the substrates S are aligned at the center A or the edge of the load lock chamber LC. 
     That is, the alignment members align the substrates S at the center A of the load lock chamber LC, as shown in  FIGS. 5A ,  5 C and  5 D, or align the substrates S at the edge B of the load lock chamber LC, as shown in  FIG. 5B . Such two types of alignment members may be selectively provided or be simultaneously provided. 
     Further, the alignment members may include stationary members or rotary members.  FIGS. 5A ,  5 E and  5 F illustrate rollers as the rotary members, and  FIGS. 5B ,  5 D, and  5 E illustrate rectilinear alignment members as the stationary members. Here, the rotary members, such as the rollers, contact the substrates S and move the substrates S using frictional force due to rotation, thus being capable of aligning the substrates S. 
       FIG. 5A  illustrates alignment members  170  provided at the center of the load lock chamber LC. As shown in  FIG. 5A , the alignment members  170  are provided at a point where the four substrates S meet. Here, the alignment members  170  are provided at regions where the edges of the respective substrates S come into plane contact with each other. In this embodiment, four alignment members  172 ,  174 ,  176  and  178  are provided at the point where the four substrates S meet. 
     The respective alignment members  172 ,  174 ,  176  and  178  may have a size (diameter) of 4˜60 mm, and such a size may be the same as the line width of the separation members of the dividers in the process chamber. 
     In  FIG. 5A , each of the respective alignment members  172 ,  174 ,  176  and  178  include a plurality of circular rollers. The above-described size of 4˜60 mm represents the separation distance between the neighboring substrates S. The alignment members  172 ,  174 ,  176  and  178  including the circular rollers serve to precisely align the substrates S through rotation and friction of the alignment members  172 ,  174 ,  176  and  178  at points where the alignment members  172 ,  174 ,  176  and  178  come into plane contact with the respective substrates S. 
       FIGS. 5C and 5D  illustrate alignment members in accordance with other embodiments of the present invention. In  FIG. 5C , a pair of alignment members  180  having a rectilinear shape cross each other at the center of the load lock chamber LC where four substrates S meet, similarly to the dividers in the process chamber. Here, a line width of the alignment members  180  may be 4˜60 mm. 
     However, the alignment members in the load lock chamber LC serve to align the substrates, and thus adjust only the interval between the substrates S at the center of the substrates S without coming into plane contact with the all the edges of the substrates S differently from the dividers in the process chamber PC. 
     In  FIG. 5D , two substrates S are provided in one chamber, and thus one alignment member  182  having a rectilinear shape is provided. 
       FIG. 5B  illustrates an alignment member  162  to align the substrate S at the edge B of the load lock chamber LC, as shown in  FIG. 4 . With reference to  FIG. 5B , the alignment member  162  surrounds the edge of the substrate S and operation of the alignment member  162  is controlled by a fine adjusting device  160 . 
     The alignment members shown in  FIG. 5A  control the substrates S so that the neighboring substrates S are not excessively close to each other, and the alignment members  162  of  FIG. 5B  controls the substrates S so that the substrates S are not excessively distant away from each other. Here, it will be appreciated that the alignment member  162  of  FIG. 5B  is provided at corners of the respective substrates S. 
     Further,  FIG. 5E  illustrates alignment members  172 ,  174 ,  176  and  178  including circular rollers in accordance with another embodiment of the present invention. Differently from the embodiment of  FIG. 5A , this embodiment illustrates that two rollers are disposed in each of lines. 
     Further, in  FIG. 5F , two substrates S are provided in one chamber, and thus alignment members  170  including rollers is provided. The substrates S aligned by the above-described alignment members in the load lock chamber LC may be transferred to the process chamber PC through the transfer chamber TC. Here, the substrates S are transferred to the process chamber TC in the same pattern as in the load lock chamber LC. 
     The above-described transfer of the substrates between the chambers is carried out by the substrate moving device. The substrate moving device includes a substrate transfer unit to transfer the substrates in the horizontal direction and a substrate conveyor unit to convey the substrates to the load lock chamber and the process chamber through sliding. 
     Here, the substrate transfer unit may move the substrates in the direction B of  FIG. 3 . Further, the substrate conveyor unit may move the substrates in the direction A or in the direction C of  FIG. 3 . That, the substrate transfer unit and the substrate conveyor unit may move the substrates in directions perpendicular to each other, respectively. 
     The substrate conveyor unit may include a vertical moving part and a horizontal moving part. That is, the horizontal moving part slides the substrates in the direction A or in the direction C through sliding of the arms. 
     Further, the vertical moving part is in charge of loading and unloading of the substrates. In order to prevent damage to the edges of the substrates due to contact with the dividers when the substrates are loaded into or unloaded out of the process chamber, the vertical moving part raises or lowers the substrates after the horizontal moving part horizontally moves the substrates to the optimum position. 
       FIG. 8  is a view illustrating a semiconductor manufacturing apparatus in accordance with another embodiment of the present invention and  FIGS. 6 and 7  are views illustrating the substrate moving device of  FIG. 3 . 
     In the semiconductor manufacturing apparatus in accordance with the embodiment of  FIG. 3 , the transfer chamber TC performs transfer of substrates between one load lock chamber LC and one process chamber PC. On the other hand, the semiconductor manufacturing apparatus in accordance with this embodiment of  FIG. 8  includes a transfer chamber TC provided among a plurality of process chambers PC. 
     Therefore, transfer of substrates between different process chambers of  FIG. 8  corresponds to transfer of substrates in the direction A or in direction C of  FIG. 3 , and transfer of the substrates by a transfer guide  210  in the horizontal direction of  FIG. 8  corresponds to transfer of the substrates in the direction B of  FIG. 3 . 
     Here, a substrate moving device includes a substrate transfer unit  200  and a substrate conveyor unit  300 . The substrate transfer unit  200  is installed in the longitudinal direction of the transfer chamber TC, and thus moves the substrate conveyor unit  300  in the horizontal direction. For this purpose, the substrate transfer unit  200  may be a linear motor. 
     Further, the substrate transfer unit  200  includes a transfer guide  210  and a transfer block part  220 . The transfer guide  210  guides horizontal transfer of the transfer block part  220 . For example, the transfer guide  210  may be a stator of the linear motor. 
     The transfer block part  220  is installed on the transfer guide  210  so as to be transferable, and is thus transferred in the horizontal direction along the transfer guide  210 . For example, the transfer block part  220  may be a rotor (or a coil part) of the linear motor. 
     The substrate conveyor unit  300  includes a base frame  310 , a fork frame  320 , first and second bi-directional sliding fork units  330  and  340 , a fork elevation unit  350 , and a fork elevation guide unit  360 . 
     The base frame  310  is installed on the transfer block part  220  of the substrate transfer unit  200 , and is moved in the horizontal direction together with the transfer block part  220 . 
     The fork frame  320  includes a first support frame  322 , a plurality of side wall supports  324 , and a second support frame  326 . 
     The first support frame  322  is installed on the base frame  310  to a designated height and is supported by the fork elevation unit  350  so as to be raised and lowered. Protrusions  328  through which the fork elevation unit  350  passes are formed on first and second side surfaces of the first support frames  322 . 
     The plural side wall supports  324  are installed at designated intervals along the edge of the first support frame  322 , thus supporting the second support frame  326 . 
     The second support frame  326  is installed on the plural side wall supporters  324  so as to overlap with the first support frame  322 . The second support frame  326  is raised and lowered together with raising and lowering of the first support frame  322 . 
     The first bi-directional sliding fork unit  330  in accordance with one embodiment includes first and second sliding forks  410  and  420 , a first fork slider  430 , and a plurality of first substrate support pads  440 . 
     The first and second sliding forks  410  and  420  are installed at a designated interval in parallel on the first support frame  322 , and are transferred in a first horizontal direction or a second horizontal direction opposite to the first horizontal direction according to driving of the first fork slider  430 . Each of the first and second sliding forks  410  and  420  includes a first guide block  412  and first to third sliding bars  414 ,  416  and  418 . 
     The first guide blocks  412  of the first and second sliding forks  410  and  420  are installed on the first support frame  322  between both sides of the first support frame  322 , and guide sliding of the first sliding bars  414 . 
     The first sliding bars  414  of the first and second sliding forks  410  and  420  are installed on the first guide blocks  412 , and are transferred in the first horizontal direction or the second horizontal direction opposite to the first horizontal direction according to driving of the first fork slider  430 . 
     The second sliding bars  416  of the first and second sliding forks  410  and  420  are installed on side surfaces of the first sliding bars  414 , and are transferred in the horizontal direction in connection with sliding of the first sliding bars  414 . 
     The third sliding bars  418  of the first and second sliding forks  410  and  420  are installed on side surfaces of the second sliding bars  416 , and are transferred in the horizontal direction in connection with sliding of the second sliding bars  416 . 
     On the other hand, the second and third sliding bars  416  and  418  may be sequentially stacked on the upper surfaces of the first sliding bars  414 , and be transferred in the horizontal direction in connection with sliding of the first sliding bars  414 . 
     The first fork slider  430  is installed between both sides of the first support frame  322  so as to be disposed between the first and second sliding forks  410  and  420 , thus simultaneously transferring both the first and second sliding forks  410  and  420  in the first horizontal direction or the second horizontal direction opposite to the first horizontal direction. 
     The first fork slider  430  includes a first guide rod  432  installed between both sides of the first support frame  322  so as to be supported by a bracket, and a first transfer cylinder  434  installed on the first guide rod  432  so as to be transferable and provided with links (not shown) respectively connected to the first and second sliding forks  410  and  420 . Such a first fork slider  430  may be a hydraulic or pneumatic cylinder to transfer the first transfer cylinder  434  using hydraulic pressure or pneumatic pressure supplied to at least one side surface of the first guide rod  432 . 
     The plural first substrate support pads  440  are installed on the third sliding bars  418  at designated intervals, and support rear surfaces of substrates when the substrates are conveyed. 
     Although this embodiment describes the first bi-directional sliding fork unit  330  as including two sliding forks  410  and  420 , the structure of the first bi-directional sliding fork unit  330  is not limited thereto and the first bi-directional sliding fork unit  330  may include two or more sliding forks so as to achieve stable substrate conveyance. Further, although this embodiment describes the first fork slider  430  of the first bi-directional sliding fork unit  330  as being the hydraulic or pneumatic cylinder, the first fork slider  430  is not limited thereto and the sliding forks  410  and  420  may be slid by at least one of an LM guider, a ball screw and a belt or combinations of at least two thereof. 
     The first bi-directional sliding fork unit  330  may further include a position sensor to detect sliding positions of the sliding bars  414 ,  416  and  418  so as to control the first fork slider  430  when the sliding bars  414 ,  416  and  418  are slid in both directions. 
     As described above, the first and second sliding forks  410  and  420  of the first bi-direction sliding fork unit  330  are stretched or retracted so as to be simultaneously slid in the first conveyance direction or the second conveyance direction opposite to the first conveyance direction using the first slider  430 , thereby transferring the substrates to the process chamber PC disposed at one side or the other side of the transfer chamber TC in both directions. 
     The second bi-directional sliding fork unit  330  in accordance with this embodiment includes third and fourth sliding forks  510  and  520 , a second fork slider  530 , and a plurality of second substrate support pads  540 . 
     The third and fourth sliding forks  510  and  520  are installed at a designated interval in parallel on the second support frame  326 , and are transferred in the first horizontal direction or the second horizontal direction opposite to the first horizontal direction according to driving of the second fork slider  530 . For this purpose, each of the third and fourth sliding forks  510  and  520  includes a second guide block  512  and fourth to sixth sliding bars  514 ,  516  and  518 . 
     The second guide blocks  512  of the third and fourth sliding forks  510  and  520  are installed on the second support frame  326  between both sides of the second support frame  326 , and guide sliding of the fourth sliding bars  514 . 
     The fourth sliding bars  514  of the third and fourth sliding forks  510  and  520  are installed on the second guide blocks  512 , and are transferred in the first horizontal direction or the second horizontal direction opposite to the first horizontal direction according to driving of the second fork slider  530 . 
     The fifth sliding bars  516  of the third and sixth sliding forks  510  and  520  are installed on side surfaces of the fourth sliding bars  514 , and are transferred in the horizontal direction in connection with sliding of the fourth sliding bars  514 . 
     The sixth sliding bars  518  of the fourth and sixth sliding forks  510  and  520  are installed on side surfaces of the fifth sliding bars  516 , and are transferred in the horizontal direction in connection with sliding of the fifth sliding bars  516 . 
     On the other hand, the fifth and sixth sliding bars  516  and  518  may be sequentially stacked on the upper surfaces of the fourth sliding bars  514 , and be transferred in the horizontal direction in connection with sliding of the fourth sliding bars  514 . 
     The second fork slider  530  is installed between both sides of the second support frame  326  so as to be disposed between the third and fourth sliding forks  510  and  520 , thus simultaneously transferring both the third and fourth sliding forks  510  and  520  in the first horizontal direction or the second horizontal direction opposite to the first horizontal direction. 
     The second fork slider  530  includes a second guide rod  532  installed between both sides of the second support frame  326  so as to be supported by a bracket, and a second transfer cylinder  534  installed on the second guide rod  532  so as to be transferable and provided with links  536  respectively connected to the third and fourth sliding forks  510  and  520 . Such a second fork slider  530  may be a hydraulic or pneumatic cylinder to transfer the second transfer cylinder  534  using hydraulic pressure or pneumatic pressure supplied to at least one side surface of the second guide rod  532 . 
     The plural second substrate support pads  540  are installed on the sixth sliding bars  518  at designated intervals, and support rear surfaces of substrates when the substrates are conveyed. 
     Although this embodiment describes the second bi-directional sliding fork unit  340  as including two sliding forks  510  and  520 , the structure of the second bi-directional sliding fork unit  340  is not limited thereto and the second bi-directional sliding fork unit  340  may include two or more sliding forks so as to achieve stable substrate conveyance. Further, although this embodiment describes the second fork slider  530  of the second bi-directional sliding fork unit  340  as being the hydraulic or pneumatic cylinder, the second fork slider  530  is not limited thereto and the sliding forks  510  and  520  may be slid by at least one of an LM guider, a ball screw and a belt or combinations of at least two thereof. 
     The second bi-directional sliding fork unit  340  may further include a position sensor to detect sliding positions of the sliding bars  514 ,  516  and  518  so as to control the second fork slider  530  when the sliding bars  514 ,  516  and  518  are slid in both directions. 
     As described above, the third and fourth sliding forks  510  and  520  of the second bi-direction sliding fork unit  340  are stretched or retracted so as to be simultaneously slid in the first conveyance direction or the second conveyance direction opposite to the first conveyance direction using the second slider  530 , thereby transferring the substrates to the process chamber PC disposed at one side or the other side of the transfer chamber TC in both directions. 
     The fork elevation unit  350  in accordance with this embodiment includes a first elevation support  352   a , a second elevation support  352   b , a first elevation motor  354   a , a second elevation motor (not shown), a first ball screw  356   a , a second ball screw  356   b , and an interlocking shaft  358 . 
     The first elevation support  352   a  is vertically installed on the base frame  320  at the first side surface of the fork frame  320 . 
     The second elevation support  352   b  is vertically installed on the base frame  310  at the second side surface of the fork frame  320  so as to face the first elevation support  352   a.    
     The first elevation motor  354   a  is installed on the base frame  310  so as to be adjacent to the inner surface of the first elevation support  352   a , thus rotating the first ball screw  356   a  in a first direction or a second direction opposite to the first direction. 
     The second elevation motor is installed on the base frame  310  so as to be adjacent to the inner surface of the second elevation support  352   b , thus rotating the second ball screw  356   b  in the same direction as the first ball screw  356   a.    
     The first ball screw  356   a  is installed between the first elevation support  352   a  and the first elevation motor  354   a  so as to pass through the protrusion  328  formed on the first support frame  322  of the fork frame  320 , thus raising or lowering the first side of the fork frame  320  according to rotation of the first elevation motor  354   a . Here, the protrusion  328  formed on the first support frames  322  is provided with a screw thread engaged with the first ball screw  356   a.    
     The second ball screw  356   b  is installed between the second elevation support  352   b  and the second elevation motor so as to pass through the protrusion  328  formed on the first support frame  322  of the fork frame  320 , thus raising or lowering the second side of the fork frame  320  according to rotation of the second elevation motor  354   b . Here, the protrusion  328  formed on the first support frame  322  is provided with a screw thread engaged with the second ball screw  356   b.    
     The interlocking shaft  358  is installed between the first elevation motor  354   a  and the second elevation motor and serves to transmit rotary force of one of the first elevation motor  354   a  or the second elevation motor to the other of the first elevation motor  354   a  or the second elevation motor, thereby interlocking rotation of the first elevation motor  354   a  and rotation of the second elevation motor so as to synchronize rotation of the first elevation motor  354   a  and rotation of the second elevation motor. 
     As described above, the fork elevation unit  350  raises or lowers the fork frame  320  according to rotation of the first and second ball screws  356   a  and  356   b  due to rotation of the first elevation motor  354   a  and the second elevation motor, thus raising or lowering the first and second bi-directional sliding fork units  330  and  340  to a desired height. 
     The fork elevation unit  350  may further include a position sensor to detect a position of the fork frame  320  when the fork frame  320  is raised or lowered so as to control rotation of the first elevation motor  354   a  and the second elevation motor. 
     The fork elevation guide unit  360  in accordance with this embodiment includes a plurality of elevation guide blocks  362  and a plurality of elevation guide rails  364 . 
     The plural elevation guide blocks  362  are installed on the side wall support  324  corresponding to the corners of the first and second side surfaces of the fork frame  320 . Here, two elevation guide blocks  362  may be installed on each of the first and second side surfaces of the fork frame  320 . 
     The plural elevation guide rails  364  are vertically installed on the base frame  310  so as to be connected to the respective elevation guide blocks  362 , thereby guiding raising or lowering of the respective elevation guide blocks  362  when the fork frame  320  is raised or lowered. 
     As described above, the substrate moving device may transfer substrates within the transfer chamber TC through horizontal transfer of the substrate transfer unit  200  and convey the substrates to the process chamber PC or the load lock chamber LC in both directions using the substrate conveyor unit  300 . 
     Hereinafter, a substrate processing method of the above-described semiconductor manufacturing apparatus, i.e., a substrate moving method will be described. 
     First, plural substrates are sequentially loaded in the first chamber (the load lock chamber) provided with the alignment members. Here, the above-described alignment members in the load lock chamber align four corners of the plural substrates. Alignment of four substrates using rollers of the alignment members has been described above. 
     In addition to the alignment members provided at the corners of the substrates, other alignment members may be provided at a point where the plural substrates meet in the load lock chamber. When four substrates are provided within the load lock chamber, the latter alignment members may be a pair of alignment members having a rectilinear shape which cross each other at the center of the load lock chamber where the four substrates meet so as to align the four substrates in the horizontal and vertical directions. 
     Thereafter, the substrate conveyor unit conveys the plural substrates from the load lock chamber to the second chamber (the transfer chamber). 
     Thereafter, the substrate transfer unit transfers the substrates within the transfer chamber. Here, the substrate transfer unit transfers the substrates from a position parallel with the load lock chamber to a position parallel with the process chamber. 
     Thereafter, the substrate conveyor unit conveys the plural substrates from the transfer chamber to the third chamber (the process chamber). Here, the plural substrates are loaded in the process chamber in the same pattern as the aligned pattern in the load lock chamber. 
     The dividers may be provided in the process chambers. The dividers are provided in the same pattern as the alignment members, i.e., a pair of dividers having a rectilinear shape which cross each other, thereby aligning the four substrates in the horizontal and vertical directions. 
     Further, when the substrate conveyor unit conveys the substrates from an unloading chamber to a loading chamber, the substrate conveyor unit vertically raises the substrates in the unloading chamber, horizontally transfers the substrates from the unloading chamber to the loading chamber, and then vertically lowers and loads the substrates in the loading chamber. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.