Patent Publication Number: US-2015064621-A1

Title: Substrate treatment device and method of applying treatment solution

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This U.S. non-provisional patent application claims priority under 35 U.S.C. §119 of Korean Patent Application Nos. 10-2013-0104072, filed on Aug. 30, 2013, and 10-2013-0165400, filed on Dec. 27, 2013, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     The present invention relates to a substrate treatment device and a method of applying a treatment solution. 
     In order to fabricate a semiconductor device, various processes, for example, cleaning, deposition, photolithography, etching, and ion implantation, are performed. A photolithography process for forming a pattern plays a very important role to achieve the high integration of a semiconductor device. 
     The photolithography process is performed by coating a photoresist on a substrate. The coating process for the photoresist may be performed while a substrate rotates. If the amounts of a photoresist coated on each area of a substrate are different, a defective substrate may be caused. 
     SUMMARY OF THE INVENTION 
     The present invention provides a substrate treatment device treating a substrate uniformly and a method of applying a treatment solution. 
     The present invention also provides a substrate treatment device coating a photoresist on a substrate uniformly and a method of applying a treatment solution. 
     Embodiments of the present invention provide substrate treatment devices including: a substrate support member configured to support a substrate to be treated; a rotation driving member rotating the substrate support member; a container provided around the substrate support member; and a treatment solution supply unit including a photoresist nozzle for supplying a photoresist to a top surface of the substrate, wherein the photoresist nozzle starts supplying the photoresist while the substrate support member rotates at a first supply speed and stops supplying the photoresist while the substrate support member rotates at a second supply speed decelerated from the first supply speed. 
     In some embodiments, the rotation driving member may rotate the substrate support member at a diffusion speed accelerated from the second supply speed after the photoresist supply is terminated. 
     In other embodiments, the diffusion speed may be set to be less than the first supply speed and greater than the second supply speed. 
     In still other embodiments, the rotation driving member may rotate the substrate support member at a termination speed decelerated from the diffusion speed and then stops the substrate support member. 
     In even other embodiments, the rotation driving member gradually may reduce a rotational speed of the substrate support member from the first supply speed to the second supply speed. 
     In yet other embodiments, the rotation driving member may rotate the substrate support member at a buffer speed for a predetermined time while the first supply speed is decelerated to the second supply speed. 
     In further embodiments, the treatment solution supply unit may include: a nozzle arm having one end where the photoresist nozzle is positioned; and a driving member moving the nozzle arm with respect to the substrate support member, wherein the stop of the photoresist supply may be made when the driving member positions the nozzle arm to allow the photoresist nozzle to be positioned above the center of the substrate. 
     In still further embodiments, the start of the photoresist supply may be made when the driving member positions the nozzle arm to allow the photoresist nozzle to be positioned eccentrically above the center of the substrate. 
     In even further embodiments, after the start of the photoresist supply, the driving member may move the nozzle arm to allow the photoresist nozzle to be positioned above the center of the substrate. 
     In yet further embodiments, the photoresist nozzle may supply the photoresist for a predetermined time as being positioned above the center of the substrate. 
     In yet further embodiments, the treatment solution supply unit may further include a pre-wet nozzle for supplying an organic solvent to the substrate. 
     In yet further embodiments, the pre-wet nozzle may supply the organic solvent to the substrate before the photoresist supply. 
     In yet further embodiments, the treatment solution supply unit may supply the organic solvent to the substrate while the pre-wet nozzle is positioned above the center of the substrate. 
     In other embodiments of the present invention, provided are methods of applying a treatment solution. The methods include: starting to supply a photoresist to a top surface of a substrate supported by a substrate support member rotating at a first supply speed, and stopping the photoresist supply while the substrate support member is decelerated from the first supply speed to a second supply speed. 
     In some embodiments, the methods may further include, after the photoresist supply is terminated, rotating the substrate support member at a diffusion speed accelerated from the second supply speed and diffuses the photoresist gathered on a center portion of the substrate to a periphery of the center. 
     In other embodiments, the methods may further include rotating the substrate support member for a predetermined time at a termination speed decelerated from the diffusion speed and stopping the rotation. 
     In still other embodiments, the methods may further include gradually decelerating the first supply speed to the second supply speed. 
     In even other embodiments, the photoresist supply may start from a position eccentric from the center of the substrate and may move to the center of the substrate. 
     In yet other embodiments, the photoresist supply may stop while the photoresist is supplied to the center of the substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the present invention, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present invention and, together with the description, serve to explain principles of the present invention. In the drawings: 
         FIG. 1  is a view of a substrate treatment device as seen from the top; 
         FIG. 2  is a view illustrating a device of  FIG. 1  as seen from a direction A-A; 
         FIG. 3  is a view illustrating a device of  FIG. 1  as seen from a direction B-B; 
         FIG. 4  is a view illustrating a device of  FIG. 1  as seen from a direction C-C; 
         FIG. 5  is a plan view of a coating module according to an embodiment of the present invention; 
         FIG. 6  is a cross-sectional view illustrating a coating module of  FIG. 5 ; 
         FIG. 7  is a front view when an organic solvent is supplied from a pre-wet nozzle during an organic solvent supply process; 
         FIG. 8  is a front view when a photoresist is supplied during an eccentric supply process; 
         FIG. 9  is a front view when a photoresist is supplied during a center supply process; 
         FIG. 10  is a front view illustrating a diffusion stage; 
         FIG. 11  is a graph illustrating the rotational speed of a support plate in a photoresist supply stage and a diffusion stage; and 
         FIG. 12  is a graph illustrating the rotational speed of a support plate according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various forms, and the scope of the present invention is not limited to the following embodiments. These embodiments are provided so that the present invention will be further completely described to those skilled in the art. Accordingly, the forms of elements in the drawings are exaggerated for clarity of description. 
     Equipment of this embodiment is used for performing a photolithography process on a substrate, for example, a semiconductor wafer or a flat display panel. Especially, the equipment of this embodiment is used to perform a coating process on a substrate, a development process, and a pre/post-exposure treatment process that is required before/after an immersion exposure. Hereinafter, the case that a substrate is used as wafer is described as an example. 
       FIGS. 1 to 4  are views illustrating a substrate treatment device according to an embodiment of the present invention.  FIG. 1  is a view illustrating a substrate treatment device as seen from the top.  FIG. 2  is a view illustrating the device of  FIG. 1  as seen from a direction A-A.  FIG. 3  is a view illustrating the device of  FIG. 1  as seen from a direction B-B.  FIG. 4  is a view illustrating the device of  FIG. 1  as seen from a direction C-C. 
     Referring to  FIGS. 1 to 4 , the substrate treatment device  1  includes a rod port  100 , an index module  200 , a first buffer module  300 , a coating and development module  400 , a second buffer module  500 , an exposure before/before treatment module  600 , an interface module  700 , and a fuzzy module  800 . The rod port  100 , the index module  200 , the first buffer module  300 , the coating and development module  400 , the second buffer module  500 , the exposure before/before treatment module  600 , and the interface module  700  are sequentially disposed in a line in one direction. The fuzzy module  800  may be provided in the interface module  700 . Unlike this, the fuzzy module  800  may be provided at various positions, for example, a position where an exposure device  900  at the rear end of the interface module  700  is connected or a side part of the interface module  700 . 
     Hereinafter, a direction in which the rod port  100 , the index module  200 , the first buffer module  300 , the coating and development module  400 , the second buffer module  500 , the exposure before/before treatment module  600 , and the interface module  700  are disposed is referred to as a first direction  12 . A direction vertical from the first direction  12 , as seen from the top, is referred to as a second direction  14 . A direction vertical to the first direction  12  and the second direction  14  is referred to as a third direction  16 . 
     A wafer W moves while received in a cassette  20 . At this point, the cassette  20  has a structure sealed from the outside. For example, a front open unified pod (FOUP) having a door at the front may be used as the cassette  20 . 
     Hereinafter, the rod port  100 , the index module  200 , the first buffer module  300 , the coating and development module  400 , the second buffer module  500 , the exposure before/before treatment module  600 , the interface module  700 , and fuzzy module  800  will be described in more detail. 
     (Rod Port) 
     The rod port  100  has a support table  120  where the cassette  20  having received wafers W is disposed. A plurality of support tables  120  are provided and arranged in a line along the second direction  14 . Four support tables  120  are provided as shown in  FIG. 1 . 
     (Index Module) 
     The index module  200  transfers a wafer W between the cassette  20  and the first buffer module  300  on the support table  120  of the rod port  100 . The index module  200  includes a frame  210 , an index robot  220 , and a guide rail  230 . The frame  210  has a rectangular form with an empty inside and is disposed between the rod port  100  and the first buffer module  300 . The frame  210  of the index module  200  may be provided lower than a frame  310  of a first buffer module  300  described later. The index robot  200  and the guide rail  230  are disposed in the frame  210 . The index robot  220  has a 4-axis driving structure for allowing a hand  221  that directly handles the wafer W to move and rotate in the first direction  12 , the second direction  14 , and the third direction  16 . The index robot  220  includes the hand  221 , an arm  222 , a support  223 , and a stand  224 . The hand  221  is fixedly installed to the arm  222 . The arm  222  is provided with a stretchable structure and a rotatable structure. The support  223  has a length direction that is disposed along the third direction  16 . The arm  222  is coupled to the support  223  to move along the support  223 . The support  223  is fixedly coupled to the stand  224 . The guide rail  230  is provided with its length direction disposed along the second direction  14 . The stand  224  is coupled to the guide rail  230  to linearly move along the guide rail  230 . Additionally, although not shown in the drawing, a door opener opening/closing the door of the cassette  20  is further provided to the frame  210 . 
     (First Buffer Module) 
     The first buffer module  300  includes a frame  310 , a first buffer  320 , a second buffer  330 , a cooling chamber  350 , and a first buffer robot  360 . The frame  310  has a rectangular form with an empty inside and is disposed between the index module  200  and the coating and development module  400 . The first buffer  320 , the second buffer  330 , the cooling chamber  350 , and the first buffer robot  360  are disposed in the frame  310 . The cooling chamber  350 , the second buffer  330 , and the first buffer  320  are disposed along the first direction  16  sequentially from the bottom. The first buffer  320  is positioned at the height corresponding to a coating module  401  of the coating and development module  400  and the second buffer  330  and the cooling chamber  350  are positioned at the height corresponding to a development module  402  of the coating and development module  400 . The first buffer robot  360  is spaced a predetermined distance in the second direction  14  from the second buffer  330 , the cooling chamber  350 , and the first buffer  320 . 
     The first buffer  320  and the second buffer  330  store a plurality of wafers W temporarily. The second buffer  330  has a housing  331  and a plurality of supports  332 . The supports  332  are disposed in the housing  331  and are provided spaced apart from each other in the third direction  16 . One wafer W is disposed at each support  332 . The housing  331  has an opening (not shown) in a direction where the index robot  220  is provided, a direction where the first buffer robot  350 , and a direction where a development unit robot  482  described later is provided, so as to allow the index robot  220 , the first buffer robot  360 , and the development unit robot  482  of the development module  402  to carry the wafer W into or from the support  332  in the housing  331 . The first buffer  320  has a relatively similar structure to the first buffer  330 . However, the hosing  321  of the first buffer  320  has an opening in a direction where the first buffer robot  360  is provided and in a direction where a coating unit robot  432  in the coating module  401  is provided. The number of the supports  322  provided in the first buffer  320  may be different from or identical to the number of the supports  332  provided in the second buffer  330 . For example, the number of the supports  322  provided in the second buffer  330  may be different from or identical to the number of the supports  322  provided in the first buffer  320 . 
     The first buffer robot  360  transfers the wafer W between the first buffer  320  and the second buffer  330 . The first buffer robot  360  includes a hand  361 , an arm  362 , and a support  363 . The hand  361  is fixedly installed to the arm  362 . The arm  362  has a stretchable structure to allow the hand  361  to move along the second direction  14 . The arm  362  is coupled to the support  363  to linearly move along the support  363  in the third direction  16 . The support  363  has an extended length from the position corresponding to the first buffer  330  to the position corresponding to the first buffer  320 . The support  363  may be further longer in an above or below direction thereof. The first buffer robot  360  may be provided to allow the hand  361  to be simply 2-axis-driven according to the second direction  14  and the third direction  16 . 
     The cooling chamber  350  cools each wafer W. The cooling chamber  350  includes a housing  351  and a cooling plate  352 . The cooling plate  352  includes a cooling means  353  cooling the top surface where the wafer W is disposed and the wafer W. Various methods, for example, cooling by coolant or cooling by a thermoelectric device, may be used for the cooling means  353 . Additionally, a lift pin assembly (not shown) positioning the wafer W on the cooling plate  352  may be provided to the cooling chamber  350 . The housing  351  has an opening (not shown) in a direction where the index robot  220  is provided and a direction where the development unit robot  482  is provided, so as to allow the index robot  220  and the development unit robot  482  of the development module  402  to carry the wafer W into or from the cooling plate  352 . Additionally, doors (not shown) opening/closing the opening may be provided to the cooling chamber  350 . 
     (Coating and Development Module) 
     The coating and development module  400  performs a process for coating a photoresist on the wafer W before an exposure process and a process for developing the wafer W after the exposure process. The coating and development module  400  has a relatively rectangular parallelepiped form. The coating and development module  400  includes a coating module  401  and a development module  402 . The coating module  401  and the development module  402  are disposed to be partitioned from each other by a layer. According to an embodiment of the present invention, the coating module  401  is disposed on the development module  402 . 
     The coating module  401  includes a process for coating a photoresist on the wafer W and a thermal treatment process for heating and cooling the wafer W before/after the resist coating process. The coating module  401  includes a resist coating chamber  410 , a bake chamber  420 , and a conveying chamber  430 . The resist coating chamber  410 , the bake chamber  420 , and the conveying chamber  430  are sequentially disposed along the second direction  14 . Accordingly, the resist coating chamber  410  and the bake chamber  420  are spaced from each other in the second direction with the conveying chamber  430  therebetween. A plurality of resist coating chambers  410  are provided in each of the first direction  12  and the third direction  16 . In the drawings, six resist coating chambers  410  are provided. A plurality of bake chambers  420  are provided in each of the first direction  12  and the third direction  16 . In the drawings, six bake chambers  420  are provided. Unlike this, the more number of bake chambers  420  may be provided. 
     The conveying chamber  430  is positioned parallel to the first buffer  320  of the first buffer module  300  in the first direction  12 . A coating unit robot  432  and a guide rail  433  are positioned in the conveying chamber  430 . The conveying chamber  430  typically has a rectangular form. The coating unit robot  432  transfers the wafer W between the bake chambers  420 , the resist coating chambers  400 , the first buffer  320  of the first buffer module  300 , and the first cooling chamber  520  of the second buffer module  500 . The guide rail  433  is disposed with its length direction parallel to the first direction  12 . The guide rail  433  guides the coating unit robot  432  to linearly move in the first direction  12 . The coating unit robot  432  includes a hand  434 , an arm  435 , a support  436 , and a stand  437 . The hand  434  is fixedly installed to the arm  435 . The arm  435  has a stretchable structure to allow the hand  434  to move in a horizontal direction. The support  436  is provided with its length direction that is disposed along the third direction  16 . The arm  435  is coupled to the support  436  to linearly move along the support  363  in the third direction  16 . The support  436  is fixedly coupled to the stand  437  and the stand  437  is coupled to the guide rail  433  to move linearly move along the guide rail  230 . 
     The resist coating chambers  410  have the same structure. However, types of a photoresist used in each resist coating chamber  410  may be different from each other. For example, a chemical amplification resist may be used as a photoresist. The resist coating chamber  410  coats the wafer W with a photoresist. The resist coating chamber  410  includes a housing  411 , a support plate  412 , and a nozzle  413 . The housing  411  has a cup form with an open top. The support plate  412  is disposed in the housing  411  and supports the wafer W. The support plate  412  is provided to be rotatable. The nozzle  413  supplies a photoresist to the top of the wafer W disposed on the support plate  412 . The nozzle  413  may have a circular pipe form and may supply a photoresist to the center of the wafer W. Selectively, the nozzle  413  may have a length corresponding to the diameter of the wafer W and a discharge port of the nozzle  413  may be provided as a slit. Additionally, the resist coating chamber  410  may further include a nozzle  414  for supplying a cleaning fluid such as deionized water to clean the surface of the wafer W where the photoresist is coated. 
     The bake chamber  420  performs a thermal treatment on the wafer W. For example, the bake chamber  420  performs a prebake process for removing organic matters or moistures of the surface of the wafer W by heating the wafer W to a predetermined temperature before applying the photoresist or a soft bake process after applying the photoresist on the wafer W, and then performs a cooling process for cooling the wafer W after each heating process. The bake chamber  420  includes a cooling plate  421  or a heating plate  422 . A cooling means  423  such as coolant or a thermoelectric device is provided to the cooling plate  421 . Additionally, a heating means  424  such as a heating wire or a thermoelectric device is provided to the heating plate  422 . The cooling plate  421  and the heating plate  422  may be separately provided in one bake chamber  420 . Selectively, part of the bake chamber  420  may include only the cooling plate  421  and another part may include only the heating plate  422 . 
     The development module  402  includes a development process for removing a portion of the photoresist by supplying a developer to obtain a pattern on the wafer W and a thermal treatment process such as heating and cooling on the wafer W before/after the development process. The development module  5402  includes a development chamber  460 , a bake chamber  470 , and a conveying chamber  480 . The development chamber  460 , the bake chamber  470 , and the conveying chamber  480  are sequentially disposed along the second direction  14 . Accordingly, the development chamber  460  and the bake chamber  470  are spaced from each other in the second direction with the conveying chamber  480  therebetween. A plurality of development chambers  460  are provided in each of the first direction  12  and the third direction  16 . In the drawings, six development chambers  460  are provided. A plurality of bake chambers  470  are provided in each of the first direction  12  and the third direction  16 . In the drawings, six bake chambers  470  are provided. Unlike this, the more number of bake chambers  470  may be provided. 
     The conveying chamber  480  is positioned parallel to the second buffer  330  of the first buffer module  300  in the first direction  12 . The development unit robot  482  and the guide rail  483  are positioned in the conveying chamber  480 . The conveying chamber  480  typically has a rectangular form. The development unit robot  482  transfers the wafer W between the bake chambers  470 , the development chambers  460 , the second buffer  330  and the cooling chamber  350  of the first buffer module  300 , and the second cooling chamber  540  of the second buffer module  500 . The guide rail  483  is disposed with its length direction parallel to the first direction  12 . The guide rail  483  guides the development unit robot  482  to linearly move in the first direction  12 . The development unit robot  482  includes a hand  484 , an arm  485 , a support  486 , and a stand  487 . The hand  484  is fixedly installed to the arm  485 . The arm  485  has a stretchable structure to allow the hand  484  to move in a horizontal direction. The support  486  is provided with its length direction that is disposed along the third direction  16 . The arm  485  is coupled to the support  486  to linearly move along the support  363  in the third direction  16 . The support  486  is fixedly coupled to the stand  487 . The stand  487  is coupled to the guide rail  483  to move along the guide rail  483 . 
     The development chambers  460  have the same structure. However, types of a photoresist used in each development chamber  460  may be different from each other. The development chamber  460  removes an irradiated area of the photoresist on the wafer W. At this point, an irradiated area in a protective layer is removed together. Selectively, according to the types of a photoresist in use, only the area that is not irradiated with light may be removed from areas of a photoresist and a protective layer. 
     The development chamber  460  includes a housing  461 , a support plate  462 , and a nozzle  463 . The housing  461  has a cup form with an open top. The support plate  462  is disposed in the housing  461  and supports the wafer W. The support plate  462  is provided to be rotatable. The nozzle  463  supplies a developer to the top of the wafer W disposed on the support plate  462 . The nozzle  463  has a circular pipe form and supplies a developer to the center of the wafer W. Selectively, the nozzle  463  may have a length corresponding to the diameter of the wafer W and a discharge port of the nozzle  463  may be provided as a slit. Additionally, the development chamber  460  may further include a nozzle  464  for supplying a cleaning fluid such as deionized water to clean the surface of the wafer W where the developer is supplied. 
     The bake chamber  470  performs a thermal treatment on the wafer W. For example, the bake chamber  470  performs a post bake process for heating the wafer W before performing a development process, a hard bake process for heating the wafer W after performing a development process, and a cooling process for cooling the heated wafer W after performing each bake process. The bake chamber  470  includes a cooling plate  471  or a heating plate  472 . A cooling means  473  such as coolant or a thermoelectric device is provided to the cooling plate  471 . Additionally, a heating means  474  such as a heating wire or a thermoelectric device is provided to the heating plate  472 . The cooling plate  471  and the heating plate  472  may be separately provided in one bake chamber  470 . Selectively, part of the bake chamber  470  may include only the cooling plate  471  and another part may include only the heating plate  472 . 
     As mentioned above, the coating module  401  and the development module  402  are separately provided in the coating and development module  400 . Additionally, the coating module  401  and the development module  402  may have the same chamber arrangement as seen from the top. 
     (Second Buffer Module) 
     The second buffer module  500  is provided as a path through which the wafer W is transferred between the coating and development module  400  and the pre/post-exposure treatment module  600 . Moreover, the second buffer module  500  performs a predetermined process, for example, a cooling process or an edge exposure process on the wafer W. The second buffer module  500  includes a frame  510 , a buffer  520 , a first cooling chamber  530 , a second cooling chamber  540 , an edge exposure chamber  550 , and a second buffer robot  560 . The frame  510  has a rectangular parallelepiped form. The buffer  520 , the first cooling chamber  530 , the second cooling chamber  540 , the edge exposure chamber  550 , and the second buffer robot  560  are disposed in the frame  510 . The buffer  520 , the first cooling chamber  530 , and the edge exposure chamber  550  are disposed at the height corresponding to the coating module  401 . The second cooling chamber  540  is disposed at the height corresponding to the development module  402 . The buffer  520 , the first cooling chamber  530 , and the second cooling chamber  540  are sequentially disposed in a line along the third direction  16 . The buffer  520  and the conveying chamber  430  of the coating module  401  are disposed along the first direction  12  as seen from the top. The edge exposure chamber  550  is spaced a predetermined distance from the buffer  520  or the first cooling chamber  530  in the second direction  14 . 
     The second buffer robot  560  transfers the wafer W between the buffer  520 , the first cooling chamber  530 , and the edge exposure chamber  550 . The second buffer robot  560  is positioned between the edge exposure chamber  550  and the buffer  520 . The second buffer robot  560  has a similar structure to the first buffer robot  560 . The first cooling chamber  530  and the edge exposure chamber  550  perform a subsequent process on the wafers W where a process is performed by the coating module  401 . The first cooling chamber  530  cools the wafers W where a process is performed by the coating module  401 . The first cooling chamber  530  has a similar structure to the cooling chamber  350  of the first buffer module  300 . The edge exposure chamber  550  exposes the edges of the wafers W where a cooling process is performed by the first cooling chamber  530 . The buffer  520  temporarily stores the wafers W before the wafers W where a process is performed by the edge exposure chamber  550  are transferred to a pre-treatment module  601  described later. The second cooling chamber  540  cools the wafers W before the wafers W where a process is performed by the post-treatment module  602  described later is transferred to the development module  402 . The second buffer module  500  may further include an additional buffer at the height corresponding to the development module  402 . In this case, the wafers W where a process is performed by the post-treatment module  602  are temporarily stored in the additional buffer and then are transferred to the development module  402 . 
     (Pre/Post-Exposure Treatment Module) 
     The pre/post-exposure treatment module  600  may perform a process for applying a protective layer to protect the photoresist layer coated on the wafer W during immersion exposure when the exposure device  900  performs an immersion exposure process. Additionally, the pre/post-exposure treatment module  600  may perform a process for cleaning the wafers W after the exposure. Additionally, when a coating process is performed by using a chemical amplification resist, the pre/post-exposure treatment module  600  may perform a bake process after the exposure. 
     The pre/post-exposure treatment module  600  includes a pre-treatment module  601  and a post-treatment module  602 . The pre-treatment module  601  performs a process for treating the wafer W before performing an exposure process and the post-treatment module  602  performs a process for treating the wafer W after performing an exposure process. The pre-treatment module  601  and the post-treatment module  602  are disposed to be partitioned from each other by a layer. According to an embodiment of the present invention, the pre-treatment module  601  is disposed on the post-treatment module  602 . The pre-treatment module  601  and the coating module  401  are provided at the same height. The post-treatment module  602  and the development module  402  are provided at the same height. The pre-treatment module  601  includes a protective layer coating chamber  610 , a bake chamber  620 , and a conveying chamber  630 . The protective layer coating chamber  610 , the conveying chamber  630 , and the bake chamber  620  are sequentially disposed along the second direction  14 . Accordingly, the protective layer coating chamber  610  and the bake chamber  620  are spaced from each other in the second direction with the conveying chamber  630  therebetween. A plurality of protective layer coating chambers  610  are provided and disposed along the third direction  16  to form respective layers. Selectively, the plurality of protective layer coating chambers  610  are provided in each of the first direction  12  and the third direction  16 . A plurality of bake chambers  620  are provided and disposed along the third direction  16  to form respective layers. Selectively, the plurality of bake chambers  620  are provided in each of the first direction  12  and the third direction  16 . 
     The conveying chamber  630  is positioned parallel to the first cooling chamber  530  of the second buffer module  500  in the first direction  12 . A pre-treatment robot  632  is positioned in the conveying chamber  630 . The conveying chamber  320  typically has a square or rectangular form. The pre-treatment robot  632  transfers the wafer W between the protective layer coating chambers  610 , the bake chambers  620 , the buffer  520  of the second buffer module  500 , and the first buffer  720  of the interface module  700  described later. The pre-treatment robot  632  includes a hand  633 , an arm  634 , and a support  635 . The hand  633  is fixedly installed to the arm  634 . The arm  634  is provided with a stretchable structure and a rotatable structure. The arm  634  is coupled to the support  635  to linearly move along the support  635  in the third direction  16 . 
     The protective layer coating chamber  610  applies on the wafer W a protective layer for protecting a photoresist layer during immersion exposure. The protective layer coating chamber  610  includes a housing  611 , a support plate  612 , and a nozzle  613 . The housing  611  has a cup shape with an open top. The support plate  612  is disposed in the housing  611  and supports the wafer W. The support plate  612  is provided to be rotatable. The nozzle  613  supplies a protective solution to the top of the wafer W disposed on the support plate  612  so as to form a protective layer. The nozzle  613  has a circular pipe form and supplies a protective solution to the center of the wafer W. Selectively, the nozzle  613  may have a length corresponding to the diameter of the wafer W and a discharge port of the nozzle  613  may be provided as a slit. In this case, the support plate  612  may be provided in a fixed state. The protection solution includes a form material. The protective solution may include a photoresist and a material with low affinity to water. For example, the protection solution may include a fluorine-based solvent. The protective layer coating chamber  610  supplies a protective solution to the center area of the wafer W as rotating the wafer W disposed on the support plate  612 . 
     The bake chamber  620  performs a thermal treatment on the wafer W where the protective layer is applied. The bake chamber  620  includes a cooling plate  621  or a heating plate  622 . A cooling means  623  such as coolant or a thermoelectric device is provided to the cooling plate  621 . Additionally, a heating means  624  such as a heating wire or a thermoelectric device is provided to the heating plate  622 . The heating plate  622  and the cooling plate  621  may be separately provided in one bake chamber  620 . Selectively, part of the bake chamber  620  may include only the heating plate  622  and another part may include only the cooling plate  621 . 
     The post-treatment module  602  includes a cleaning chamber  660 , a post exposure bake chamber  670 , and a conveying chamber  680 . The cleaning chamber  660 , the conveying chamber  680 , and the post exposure bake chamber  670  are sequentially disposed along the second direction  14 . Accordingly, the cleaning chamber  660  and the post exposure bake chamber  670  are spaced from each other in the second direction with the conveying chamber  680  therebetween. A plurality of cleaning chambers  660  are provided and disposed along the third direction  16  to form respective layers. Selectively, the plurality of cleaning chambers  660  are provided in each of the first direction  12  and the third direction  16 . A plurality of post exposure bake chambers  670  are provided and disposed along the third direction  16  to form respective layers. Selectively, the plurality of post exposure bake chambers  670  are provided in each of the first direction  12  and the third direction  16 . 
     The conveying chamber  680  is positioned parallel to the second cooling chamber  540  of the second buffer module  500  in the first direction  12  as seen from the top. The conveying chamber  680  typically has a square or rectangular form. A post-treatment robot  682  is positioned in the conveying chamber  680 . The post-treatment robot  682  transfers the wafer W between the cleaning chambers  660 , the post exposure bake chambers  670 , the second cooling chamber  540  of the second buffer module  500 , and a second buffer  730  of an interface module  700  described later. The post-treatment robot  682  provided in the post-treatment module  602  may have the same structure as the pre-treatment robot  632  provided in the pre-treatment module  601 . 
     The cleaning chamber  660  cleans the wafer W after an exposure process. The cleaning chamber  660  includes a housing  661 , a support plate  662 , and a nozzle  663 . The housing  661  has a cup shape with an open top. The support plate  662  is disposed in the housing  661  and supports the wafer W. The support plate  662  is provided to be rotatable. The nozzle  663  supplies a cleaning solution to the top of the wafer W disposed on the support plate  662 . Water such as deionized water may be used as the cleaning solution. The cleaning chamber  660  supplies a cleaning solution to the center area of the wafer W as rotating the wafer W disposed on the support plate  662 . Selectively, while the wafer W rotates, the nozzle  663  may linearly or rotatably move from the center area to the edge area of the wafer W. 
     The post exposure bake chamber  670  heats the wafer W, where an exposure process is performed, by using ultraviolet. The post exposure bake process amplifies an acid generated in a photoresist through exposure by heating the wafer W, thereby completing of the property change of the photoresist. The post exposure bake chamber  670  includes a heating plate  672 . A heating means  674  such as a heating wire or a thermoelectric device is provided to the heating plate  672 . The post exposure bake chamber  670  includes a cooling plate  671  therein. A cooling means  673  such as coolant or a thermoelectric device is provided to the cooling plate  671 . Additionally, a bake chamber including only the cooling plate  672  may be further provided selectively. 
     As mentioned above, the pre-treatment module  601  and the post-treatment module  602  are completely separated and provided to the post exposure treatment module  600 . Additionally, the conveying chamber  630  of the pre-treatment module  601  and the conveying chamber  680  of the post-treatment module  602  are provided with the same size, so that they may overlap each other completely as seen from the top. Additionally, the protective layer coating chamber  610  and the cleaning chamber  660  are provided with the same size, so that they may overlap each other completely as seen from the top. Additionally, the bake chamber  620  and the post exposure bake chamber  670  are provided with the same size, so that they may overlap each other completely as seen from the top. 
     (Interface Module) 
     The interface module  700  transfers the wafer W between the pre/post-exposure treatment module  600 , a fuzzy module  800 , and an exposure device  900 . The interface module  700  includes a frame  710 , a first buffer  720 , a second buffer  730 , and an interface robot  740 . The first buffer  720 , the second buffer  730 , and the interface robot  740  are disposed in the frame  710 . The first buffer  720  and the second buffer  730  are spaced a predetermined distance from each other and disposed to be stacked each other. The first buffer  720  is disposed higher than the second buffer  730 . The first buffer  720  is positioned at the height corresponding to the pre-treatment module  601  and the second buffer  730  is disposed at the height corresponding to the post-treatment module  602 . As seen from the top, the first buffer  720  and the conveying chamber  630  of the pre-treatment module  601  are disposed in a line along the first direction  12  and the second buffer  730  and the conveying chamber  630  of the pre-treatment module  602  are disposed in a line along the first direction  12 . 
     The interface robot  740  is spaced from the first buffer  720  and the second buffer  730  in the second direction  14 . The interface robot  740  transfers the wafer W between the first buffer  720 , the second buffer  730 , the fuzzy module  800 , and the exposure device  900 . The interface robot  740  has a relatively similar structure to the second buffer robot  560 . 
     The first buffer  720  temporarily stores the wafers W before the wafers W where a process is performed by the edge exposure chamber  720  are transferred to the exposure device  900 . Then, the second buffer  730  temporarily stores the wafers W before the wafers W where a process is completed by the exposure device  900  are transferred to the post-treatment module  602 . The first buffer  720  has a housing  721  and a plurality of supports  722 . The supports  722  are disposed in the housing  721  and are provided spaced apart from each other in the third direction  16 . One wafer W is disposed at each support  722 . The housing  721  has an opening (not shown) in a direction where the interface robot  740  is provided and a direction where the pre-treatment robot  632  is provided, so as to allow the interface robot  740  and the pre-treatment robot  632  to carry the wafer W into or from the hosing  721 . The second buffer  730  has a relatively similar structure to the first buffer  720 . However, the hosing  4531  of the second buffer  730  has an opening (not shown) in a direction where the interface robot  740  is provided and in a direction where the post-treatment robot  682  is provided. An interface module may include only the above-mentioned buffers and robots without a chamber for performing a predetermined process on a wafer. 
     (Fuzzy Module) 
     The fuzzy module  800  may be disposed in the interface module  700 . In more detail, the fuzzy module  800  may be disposed at the position facing the first buffer  720  on the basis of the interface robot  740 . Unlike this, the fuzzy module  800  may be provided at various positions, for example, a position where the exposure device  900  at the rear end of the interface module  700  is connected or a side part of the interface module  700 . The fuzzy module  800  performs a gas purge process and a rinse process on a wafer where a protective layer is applied through the pre/post-exposure treatment module  600  to protect a photoresist. 
       FIG. 5  is a plan view of a coating module according to an embodiment of the present invention.  FIG. 6  is a cross-sectional view of the coating module of  FIG. 5 . 
     Referring to  FIGS. 5 to 6 , the coating module  401  includes a substrate support member  4100  and a treatment solution supply unit  4300 . The substrate support member  4100  supports a substrate W. The substrate support member  4100  may rotate while supporting the substrate W. The treatment solution supply unit  4300  supplies a treatment solution to the top of the substrate W disposed on the substrate support member  4100  so as to treat the substrate W. 
     The substrate support member  4100  supports the substrate W and is rotated by the rotation driving member  4120  such as a motor during a process. The substrate support member  4100  has a support plate  4140  having a circular top surface and pin members  4160  supporting the substrate W are installed at the top surface of the support plate  4140 . The substrate W supported by the pin members  4160  rotates as the substrate support member  4100  rotates by the rotation driving member  4120 . 
     A container  4200  is disposed around the substrate support member  4100 . The container  4200  typically has a cylindrical form. A discharge hole  4240  is formed at a lower wall  4220  and a discharge pipe  4260  communicates with the discharge pipe  4260 . A discharge member  4280  such as a pump is connected to the discharge pipe  4260 . The discharge member  4280  provides a pressure to discharge air in the container  4200  containing a treatment solution scattered by the rotation of the substrate W. 
     The treatment solution supply unit  4300  supplies a treatment solution to the top of the substrate W disposed on the substrate support member  4100 . The treatment solution supply unit  4300  includes a nozzle arm  4320  provided at one side of the substrate support member  4100 . A plurality of nozzles  4340  and  4360  may be mounted at the end of the nozzle arm  4320 . The nozzles  4340  and  4360  may be disposed in a line at one end of the nozzle arm  4320  in vertical to the length direction of the nozzle arm  4320 . One of the nozzles  4340  and  4360  is provided as a photoresist nozzle  4360  and the other one is provided as a pre-wet nozzle  4340 . The nozzle arm  4320  may be disposed at one side of the substrate support member  4100  to allow the arrangement direction of the nozzles  4340  and  4360  to pass through the center of the substrate W disposed on the substrate support member  4100 . 
     The photoresist nozzle  4360  supplies a photoresist to the substrate W. The pre-wet nozzle  4340  supplies an organic solvent to the substrate W in order to improve the wettability of the photoresist with respect to the substrate W before providing the photoresist to the substrate W. If the organic solvent is supplied before the photoresist is supplied on the substrate W, the photoresist is uniformly spread on the substrate W, so that a uniform photoresist layer may be formed on the substrate W. 
     The organic solvent supplied from the pre-wet nozzle  4340  to the substrate W may include a thinner. 
     The nozzle arm  4320  equipped with the plurality of nozzles  4340  and  4360  may linearly move by a driving member  4400  along the arrangement direction of the nozzles  4340  and  4360 . The driving member  4400  includes a nozzle arm support member  4410  and a guide member  4420 . A nozzle arm support member  4410  is coupled to the other end of the nozzle arm  4320 . The nozzle arm support member  4410  may be provided in a rod form disposed in a downward direction at one side of the nozzle arm  4320 . A lower part of the nozzle arm support member  4410  is connected to the guide member  4420 . The guide member  4420  is disposed at one side of the substrate support member  4100  to be vertical to the length direction of the nozzle arm  4320  according to a planar arrangement structure. The guide member  4420  has a rail form and guides a linear movement of the nozzle arm support member  4410 . The nozzle arm support member  4410  may be provided to be variable in a vertical length. 
     As moving linearly by the driving member  4400  having the above configuration, the treatment solution supply unit  4300  may move to a process position on the substrate support member  4100  and a process standby position provided at one side of the substrate support member  4100 . 
       FIG. 7  is a front view when an organic solvent is supplied from a pre-wet nozzle during an organic solvent supply process. 
     Referring to  FIGS. 5 to 7 , the treatment solution supply unit  4300  supplies an organic solvent to the substrate W positioned at the substrate support member. 
     The driving member  4400  adjusts the position of the pre-wet nozzle  4340  with respect to the substrate W while the organic solvent is supplied. For example, the driving member  4400  may move the nozzle arm  4320  to allow the pre-wet nozzle  4340  to be positioned above the center of the substrate W. Accordingly, the pre-wet nozzle  4340  supplies an organic solvent to the center of the substrate W. While the organic solvent is supplied, the rotation driving member  4400  rotates the support plate  4140 . Accordingly, as the organic solvent supplied to the substrate W is diffused by centrifugal force in a radial direction from the center of the substrate W and then is uniformly applied to the top surface of the substrate W. As another example, the pre-wet nozzle  4340  starts supplying an organic solvent at the off-center position of the substrate W. Then, the driving member  4400  moves the nozzle arm  4320  to allow the pre-wet nozzle  4340  to be positioned above the center of the substrate W while the organic solvent is supplied. 
       FIG. 8  is a front view when a photoresist is supplied during an eccentric supply process and  FIG. 9  is a front view when a photoresist is supplied during a center supply process. 
     Referring to  FIGS. 5 to 9 , the treatment solution supply unit  4300  supplies an organic solvent to the substrate W during a predetermined time and then supplies a photoresist to the substrate W. 
     When the organic solvent is supplied during the predetermined time, the treatment solution supply unit  4300  starts supplying the photoresist solution. The photoresist supply stage S of  FIG. 11  may include the eccentric supply state Se of  FIG. 11  and the center supply stage Sc of  FIG. 11 . 
     The treatment solution supply unit  4300  starts supplying a photoresist to the eccentric supply stage Se. First, the driving member  4400  moves the nozzle arm  4360  to allow the photoresist nozzle  4360  to be positioned above the eccentric portion with respect to the center of the substrate W. Then, the photoresist nozzle  4360  starts supplying a photoresist to an eccentric portion from the center of the substrate W. In the eccentric supply stage Se, while the photoresist is supplied, the rotation driving member  4400  rotates the support plate  4140 . Accordingly, the photoresist supplied to the substrate W is diffused around. 
     After the photoresist nozzle  4360  starts supplying a photoresist, the driving member  4400  moves the nozzle arm  4320  to allow the photoresist nozzle  4360  to be positioned above the center of the substrate W. The movement of the nozzle arm  4321  may start simultaneously as starting a photoresist supply. Additionally, the movement of the nozzle arm  4321  may start after starting a photoresist supply for a predetermined time. 
     The movement speed of the nozzle arm  4320  in the center direction of the substrate W may be constant speed. Additionally, the movement speed of the nozzle arm  4321  may vary over time. For example, the movement speed of the nozzle arm  4321  may be accelerated, constant, or decelerated according to the lapse of a predetermined time. 
     After the eccentric supply stage Se, according to the center supply state Sc, the treatment solution supply unit  4300  supplies a photoresist to the substrate W. In more detail, as the nozzle arm  4320  moves in the center direction of the substrate W, when the photoresist nozzle  4360  is positioned above the center of the substrate W, the driving member  4400  stops the nozzle arm  4320 . After staring to supply a photoresist in the eccentric supply stage Se, the photoresist nozzle  4360  continuously supplies the photoresist to the substrate W in the eccentric supply stage Se and the center supply stage Sc. 
     While the photoresist is supplied in the center supply stage Sc, the rotation driving member  4400  rotates the support plate  4140 . Accordingly, the photoresist supplied to the center of the substrate W is diffused around. 
     According to another embodiment of the present invention, the eccentric supply stage Se may be omitted. Accordingly, after an inorganic solvent supply to the substrate W is completed, the photoresist is supplied to the substrate W in the center supply stage Sc. 
       FIG. 10  is a front view illustrating a diffusion stage. 
     Referring to  FIGS. 5 to 10 , the diffusion stage SP starts as the photoresist supply stage S stops. 
     The photoresist nozzle  4360  stops the supply while supplying the photoresist to the center of the substrate W. In the diffusion stage after the photoresist supply stops, the rotation driving member  4400  rotates the support plate  4140  continuously. Accordingly, the photoresist supplied to the center of the substrate W is diffused continuously, so that the coating uniformity of the top surface of the substrate W becomes improved. 
       FIG. 11  is a graph illustrating the rotational speed of a support plate in a photoresist supply stage and a diffusion stage. 
     Referring to  FIGS. 8 to 11 , the rotational speed of the support plate  4140  varies over time. 
     In the eccentric supply stage Se, the support plate  4140  rotates at the constant speed of a first supply speed Va. The first supply speed Va may be identical to the rotational speed of the support plate  4140  during an organic solvent supply. Additionally, the first supply speed Va may be faster or slower than the rotational speed of the support plate  4140  during an organic solvent supply. After the eccentric supply stage Se stops, the rotational speed of the support plate  4140  is maintained for a predetermined time after the start of the center supply stage Sc. 
     After a photoresist solution is supplied for a predetermined time in the center supply stage Sc, the rotational speed of the support plate  4140  is decelerated from the first supply speed Va to the second supply speed Vb. The slope of the graph in an interval at which the support plate  4140  is decelerated from the first supply speed Va to the second supply speed Vb may be adjusted according to the size of the substrate W and the amount of a photoresist supplied to the substrate W. The center supply stage Sc is maintained for a predetermined time at the second supply speed Vb and then is terminated. 
     After/before the photoresist supply stops, a force applied to the top surface of the substrate W may be changed. Such a force is generated by a centrifugal force from the rotation of the support plate  4140 , a force that the supplied photoresist is applied on the top surface of the substrate W, and an interaction thereof. After/before the photoresist supply stops, changes in such forces cause the disparity for each area of the photoresist supplied to the top surface of the substrate W. On the other hand, the coating module  401  according to an embodiment of the present invention stops the photoresist supply at the second supply speed Vb that is decelerated from the first supply speed Va. That is, while such forces that cause the disparity for each area of the photoresist are reduced, the photoresist supply is stopped. Accordingly, the disparity for each area of the photoresist, which occurs when the photoresist supply stops, may be minimized. 
     Additionally, the second supply speed Vb is set as a speed at which a portion of the photoresist is not scattered around and is gathered on the center of the substrate W. The photoresist gathered on the center may flow to fill the disparity for each area caused by a force occurring when the photoresist supply stops. 
     In the diffusion stage SP, the support plate  4140  is accelerated to allow the photoresist gathered on the center of the substrate W to be diffused around. In more detail, the support plate  4140  is accelerated from the second supply speed Vb to a diffusion speed Vc after a predetermined time. The diffusion speed Vc may be set according to the size of the substrate W and a process time in the coating module  401 . For example, the diffusion speed Vc may be set to be less than the first supply speed Va. Additionally, the diffusion speed Vc may be set to be identical to or greater than first supply speed Va. 
     After the diffusion speed Vc is maintained for a predetermined time, the support plate  4140  is decelerated to a termination speed Vd. The termination speed Vd may be identical to the second supply speed Vb. Additionally, the termination speed Vd may be greater than or less than the second supply speed Vb. Then, when the support plate  4140  rotates at the terminal speed Vd for a predetermined time and stops, a photoresist coating process is terminated in a coating module. 
       FIG. 12  is a graph illustrating the rotational speed of a support plate according to another embodiment of the present invention. 
     Referring to  FIG. 12 , in a center supply stage Sc 1 , a deceleration from a first supply speed Va 1  to a second supply speed Vb 2  may be gradually performed. In more detail, the deceleration in the center supply stage Sc 1  is from the first supply speed Va 1  to a buffer speed VP. Then, the support plate  4140  rotates for a predetermined time at the buffer speed VP and then rotates at the second supply speed Vb 2  again. At this point, the slope of the graph when the first supply speed Va 1  is decelerated to the buffer speed VP may be set to be identical to the slope of the graph when the buffer speed VP is decelerated to the second supply speed Vb 2 . Additionally, the slope of the graph when the first supply speed Va 1  is decelerated to the buffer speed VP may be set to be greater or less than the slope of the graph when the buffer speed VP is decelerated to the second supply speed Vb 2 . Additionally, the buffer speed VP may be set with an arithmetic average value of the first supply speed Va 1  and the second supply speed Vb 2 . Additionally, the buffer speed VP may be set to be greater or less than an arithmetic average value of the first supply speed Va 1  and the second supply speed Vb 2 . Additionally, although one buffer speed VP is positioned between the first supply speed Va 1  and the second supply speed Vb 2  as shown in  FIG. 12 , two buffer speeds VP are positioned, so that the deceleration of the support plate  4140  may be achieved through more than two stages. 
     According to an embodiment of the present invention, a substrate may be treated uniformly. 
     Furthermore, according to an embodiment of the present invention, a photoresist may be applied to a substrate uniformly. 
     The above-disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true spirit and scope of the present invention. Thus, to the maximum extent allowed by law, the scope of the present invention is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description.