Patent Publication Number: US-2023140253-A1

Title: Apparatus for treating substrate and method for treating a substrate

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     A claim for priority under 35 U.S.C. § 119 is made to Korean Patent Application No. 10-2021-0148457 filed on Nov. 2, 2021, in the Korean Intellectual Property Office, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND 
     Embodiments of the inventive concept described herein relate to a substrate treating apparatus, more specifically, a substrate treating apparatus for plasma treating a substrate. 
     A plasma refers to an ionized gas state composed of ions, radicals, and electrons. The plasma is produced by a very high temperatures, a strong electric field, or a high frequency electromagnetic field (RF electromagnetic field). A semiconductor device manufacturing process may include an etching process of removing a thin film formed on a substrate such as a wafer using the plasma. The etching process is performed by colliding ions and/or radicals of the plasma with the thin film on the substrate or reacting with the thin film. 
     When treating the substrate using the plasma inside the process chamber, an inner pressure of the process chamber should be appropriately adjusted. The inner pressure of the process chamber is adjusted by exhausting an atmosphere inside the process chamber through an exhaust line. In order to precisely adjust the atmosphere inside the process chamber, it is essential to appropriately adjust an opening degree of the exhaust line, and to this end, a plurality of driving members moving opening/closing members for opening and closing the exhaust line are required. This leads to a structural complexity of the substrate treating apparatus. In addition, opening/closing members installed inside the exhaust line to block the inside of the exhaust line or adjust an inner opening degree of the exhaust line are frequently maintained due to particles or process byproducts flowing inside the exhaust line. This leads to a problem of a lowered substrate treating efficiency. 
     SUMMARY 
     Embodiments of the inventive concept provide a substrate treating apparatus and method for effectively adjusting an inner pressure of a treating space. 
     Embodiments of the inventive concept provide a substrate treating apparatus and method for efficiently exhausting process by-products flowing in a treating space. 
     Embodiments of the inventive concept provide a substrate treating apparatus and method for minimizing a structural complexity. 
     The technical objectives of the inventive concept are not limited to the above-mentioned ones, and the other unmentioned technical objects will become apparent to those skilled in the art from the following description. 
     The inventive concept provides a substrate treating apparatus. The substrate treating apparatus includes a housing having a treating space for treating a substrate; a support unit configured to support the substrate at the treating space; and a plasma source for generating a plasma from a process gas supplied into the treating space; an exhaust line connecting to the housing and exhausting an atmosphere of the treating space; and a pressure adjusting unit positioned between the support unit and the exhaust line and configured to adjust an exhaust pressure exhausted from the exhaust line, and wherein the pressure adjusting unit includes: an opening/closing member for opening and closing the exhaust line; a lifting/lowering member for moving the opening/closing member in an up/down direction; and an elastic member for providing a restoring force to the lifting/lowering member. 
     In an embodiment, opening/closing member includes: a base plate formed to cover the exhaust line when seen from above; and a stopper member extending from a bottom end of the base plate and having a diameter which is the same or smaller than a diameter of the exhaust line. 
     In an embodiment, the elastic member connects a bottom end of the support unit and a top end of the base plate. 
     In an embodiment, the elastic member is provided in a plurality, and the plurality of elastic member are positioned at regular intervals based on a center of the base plate. 
     In an embodiment, the lifting/lowering member includes: a body combined to a bottom end of the support unit, having an inner space, and storing a fluid in the inner space; a lifting/lowering rod having an end combining with the opening/closing member and moving in the up/down direction due to a fluid of the inner space; and a fluid supply unit configured to supply the fluid to the inner space. 
     In an embodiment, the apparatus further includes a controller for controlling the lifting/lowering member, and wherein the controller controls the lifting/lowering member so a relative height between the opening/closing member and a top end of the exhaust line is changed by an adjusting of a supply amount of the fluid supplied to the inner space. 
     In an embodiment, the controller controls the lifting/lowering member to supply the fluid to the inner space, if the opening/closing member moves in a downward direction, and controls the lifting/lowering member so the elastic member provides the restoring force to the lifting/lowering member by stopping a supply of the fluid in the inner space, if the opening/closing member moves in an upward direction. 
     In an embodiment, the pressure adjusting unit further comprises a position sensor installed at a bottom end of the support unit and measuring a position information of the opening/closing member by measuring a height from a bottom end of the support unit to the top end of the opening/closing member, and wherein the controller controls the lifting/lowering member so a relative height between a bottom end of the opening/closing member and a top end of the exhaust line is changed based on an opening degree of the exhaust line, which is measured by a height of the opening/closing member measured by the position sensor. 
     In an embodiment, the lifting/lowering member is installed at a center of the opening/closing member. 
     The inventive concept provides a substrate treating apparatus. The substrate treating apparatus includes a housing having a treating space for treating a substrate; a support unit configured to support the substrate at the treating space; a gas supply unit configured to supply a process gas to the treating space; a plasma source for exciting a plasma from the process gas; an exhaust line connecting to a bottom end of the housing and exhausting an atmosphere of the treating space; and a pressure adjusting unit positioned between the support unit and the exhaust line and configured to adjust an exhaust pressure exhausted from the exhaust line, and wherein the pressure adjusting unit includes: an opening/closing member for opening and closing the exhaust line; a lifting/lowering member for moving the opening/closing member in an up/down direction; and an elastic member for providing a restoring force to the lifting/lowering member, and wherein the opening/closing member includes: a base plate formed to cover the exhaust line when seen from above; and a stopper member extending from a bottom end of the base plate and having a diameter which is the same or smaller than a diameter of the exhaust line, and wherein the elastic member connects a bottom end of the support unit and a top end of the base plate. 
     In an embodiment, the elastic member is provided in a plurality, and positioned at regular intervals based on a center of the base plate. 
     In an embodiment, the lifting/lowering member includes: a body combined to the bottom end of the support unit, having an inner space, and storing a fluid in the inner space; a lifting/lowering rod having an end combining with the opening/closing member and moving in the up/down direction due to the fluid of the inner space; and a fluid supply unit configured to supply the fluid to the inner space. 
     In an embodiment, the substrate treating apparatus further includes a controller for controlling the lifting/lowering member, and wherein the pressure adjusting unit further comprises a position sensor installed at the bottom end of the support unit and measuring a position information of the opening/closing member by measuring a height from the bottom end of the support unit to a top end of the opening/closing member, and wherein the controller controls the lifting/lowering member so a relative height between a bottom end of the opening/closing member and a top end of the exhaust line is changed based on an opening degree of the exhaust line, which is measured by a height of the opening/closing member measured by the position sensor. 
     In an embodiment, the controller controls the lifting/lowering member to supply the fluid to the inner space, if the opening/closing member moves in a downward direction, and controls the lifting/lowering member so the elastic member provides the restoring force to the lifting/lowering member by stopping a supply of the fluid in the inner space, if the opening/closing member moves in an upward direction. 
     The inventive concept provides a substrate treating method. The substrate treating method includes performing a plasma treatment on a substrate by taking-in the substrate to a treating space, and exhausting an atmosphere of the treating space to adjust an inner pressure of the treating space; taking-out the substrate treating the treating space after the performing is completed; and exhausting the atmosphere of the treating space, and wherein at the performing, the inner pressure of the treating space is adjusted by adjusting an opening degree of an exhaust line for exhausting the atmosphere of the treating space, and at the exhausting, the atmosphere of the treating space is exhausted by closing the exhaust line. 
     In an embodiment, an atmosphere adjusting of the treating space is performed by the pressure adjusting unit, and the pressure adjusting unit includes: an opening/closing member for opening and closing the exhaust line; a lifting/lowering member for moving the opening/closing member in an up/down direction by a fluid; and an elastic member for providing a restoring force to the lifting/lowering member. 
     In an embodiment, the performing further comprises adjusting a supply amount of a fluid supplied to the lifting/lowering member to change a relative height between the opening/closing member and a top end of the exhaust line. 
     In an embodiment, the performing further comprises changing a relative height between a bottom end of the opening/closing member and a top end of the exhaust line based on the opening degree of the exhaust line, which is measured by measuring a current height of the opening/closing member and calculating the opening degree of the exhaust line is calculated based on the height information. 
     In an embodiment, the fluid is supplied to the lifting/lowering member to move the opening/closing member in a downward direction, if the inner pressure of the treating space is increased, and the opening/closing member is moved in an upward direction by providing the restoring force to the lifting/lowering member by the elastic member by adjusting a supply amount of the fluid to the lifting/lowering member, if the inner pressure of the treating space is decreased. 
     In an embodiment, the exhausting completely opens the exhaust line by moving the opening/closing member in an upward direction by providing the restoring force to the lifting/lowering unit by the elastic member and stopping a supply of the fluid to the lifting/lowering member. 
     According to an embodiment of the inventive concept, an inner pressure of an treating space may be effectively adjusted. 
     According to an embodiment of the inventive concept, process by-products flowing in a treating space may be efficiently exhausted. 
     According to an embodiment of the inventive concept, a structural complexity of an apparatus may be minimized to effectively perform a maintenance work. 
     The effects of the inventive concept are not limited to the above-mentioned ones, and the other unmentioned effects will become apparent to those skilled in the art from the following description. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       The above and other objects and features will become apparent from the following description with reference to the following figures, wherein like reference numerals refer to like parts throughout the various figures unless otherwise specified, and wherein: 
         FIG.  1    schematically illustrates a substrate treating apparatus according to an embodiment of the inventive concept. 
         FIG.  2    schematically illustrates an embodiment of a process chamber of  FIG.  1   . 
         FIG.  3    schematically illustrates a pressure adjusting unit of  FIG.  2    from above. 
         FIG.  4    and  FIG.  5    schematically illustrate another embodiment of the process chamber of  FIG.  2   . 
         FIG.  6    is a flowchart of a substrate treating method according to an embodiment of the inventive concept. 
         FIG.  7    schematically illustrates a substrate taking-in step of  FIG.  6   . 
         FIG.  8    and  FIG.  9    schematically illustrate a state of adjusting an inner pressure of the process chamber in a process step of  FIG.  6   . 
         FIG.  10    schematically illustrates the substrate taking-in step of  FIG.  6   . 
         FIG.  11    schematically illustrates an exhaust step of  FIG.  6   . 
     
    
    
     DETAILED DESCRIPTION 
     The inventive concept may be variously modified and may have various forms, and specific embodiments thereof will be illustrated in the drawings and described in detail. However, the embodiments according to the concept of the inventive concept are not intended to limit the specific disclosed forms, and it should be understood that the present inventive concept includes all transforms, equivalents, and replacements included in the spirit and technical scope of the inventive concept. In a description of the inventive concept, a detailed description of related known technologies may be omitted when it may make the essence of the inventive concept unclear. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the inventive concept. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Also, the term “exemplary” is intended to refer to an example or illustration. 
     It will be understood that, although the terms “first”, “second”, “third”, etc., may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the inventive concept. 
     Hereinafter, an embodiment of the inventive concept will be described in detail with reference to  FIG.  1    to  FIG.  11   . 
       FIG.  1    schematically illustrates a substrate treating apparatus according to an embodiment of the inventive concept. Referring to  FIG.  1   , the substrate treating apparatus  1  according to an embodiment of the inventive concept may include a load port  10 , an atmospheric pressure transfer module  20 , a vacuum transfer module  30 , a load lock chamber  40 , a process chamber  50 , and a controller  60 . 
     The load port  10  may be disposed on a side of the atmospheric pressure transfer module  20  to be described later. One or more load ports  10  may be provided. The number of load ports  10  may increase or decrease according to a process efficiency, foot print conditions, and the like. A container F according to an embodiment of the inventive concept may be placed in the load port  10 . The container F may be loaded onto or unloaded from the load port  10  by a transfer means (not shown) such as an overhead transfer apparatus (OHT), an overhead conveyor, or an automatic guided vehicle, or by an operator. The container F may include various types of containers according to a type of an article to be stored. As the container F, an airtight container such as a front opening integrated pod (FOUP) may be used. 
     The atmospheric pressure transfer module  20  and the vacuum transfer module  30  may be arranged in a first direction  2 . Hereinafter, when viewed from above, a direction perpendicular to the first direction  2  is defined as a second direction  4 . In addition, a direction perpendicular to a plane including both the first direction  2  and the second direction  4  is defined as a third direction  6 . Here, the third direction  6  is a direction perpendicular to the ground. 
     The atmospheric pressure transfer module  20  may selectively transfer the substrate W or the ring member R between the container F and the load lock chamber  40  to be described later. For example, the atmospheric pressure transfer module  20  may take out the substrate W from the container F and transfer the substrate W to the load lock chamber  40 , or may take out the substrate W from the load lock chamber  40  and transfer the substrate W to the container F. The atmospheric pressure transfer module  20  may include a transfer frame  220  and a first transfer robot  240 . The transfer frame  220  may be provided between the load port  10  and the load lock chamber  40 . That is, the load port  10  may be connected to the transfer frame  220 . The transfer frame  220  may be provided with an atmospheric pressure therein. An inside of the transfer frame  220  may be maintained in an atmospheric pressure atmosphere. 
     The transfer frame  220  may be provided with a first transfer robot  240 . The first transfer robot  240  may selectively transfer the substrate W or the ring member R between the container F seated on the load port  10  and the load lock chamber  40  to be described later. 
     The first transfer robot  240  may move in a up/down direction. The first transfer robot  240  may have a first transfer hand  242  that moves forwardly, backwardly, or rotates on a horizontal plane. One or a plurality of first transfer hands  242  of the first transfer robot  240  may be provided. The substrate W may be placed on the first transfer hand  242 . The first transfer hand  242  may transfer the ring member R. Selectively, a ring carrier (not shown) to be described later supporting the ring member R may be placed on the first transfer hand  242 . Selectively, the first transfer hand  242  can directly support the ring member R. However, the inventive concept is not limited thereto, and the ring member R can be placed directly on the first transfer hand  242 . 
     The vacuum transfer module  30  may be disposed between a load lock chamber  40  to be described later and a process chamber  50  to be described later. The vacuum transfer module  30  may include a transfer chamber  320  and a second transfer robot  340 . 
     The transfer chamber  320  may maintain an inner atmosphere as a vacuum pressure atmosphere. The transfer chamber  320  may be provided with a second transfer robot  340 . In an embodiment, the second transfer robot  340  may be located in a central area of the transfer chamber  320 . The second transfer robot  340  may selectively transfer the substrate W or the ring member R between the load lock chamber  40  and the process chamber  50 . Selectively, the vacuum transfer module  30  may transfer the substrate W between the process chambers  50 . The second transfer robot  340  may move in a horizontal and vertical direction. The second transfer robot  340  may have a second transfer hand  342  that moves forwardly, backwardly, or rotates on a horizontal plane. At least one second transfer hand  342  of the second transfer robot  340  may be provided. 
     At least one process chamber  50  to be described later may be connected to the transfer chamber  320 . The transfer chamber  320  may be provided in a polygonal shape. A load lock chamber  40  and a process chamber  50  may be disposed around the transfer chamber  320 . For example, as shown in  FIG.  1   , a hexagonal shaped transfer chamber  320  may be disposed at a central area of the vacuum transfer module  30 , and a load lock chamber  40  and a process chamber  50  may be disposed around the transfer chamber  320 . However, a shape of the transfer chamber  320  and the number of process chambers may be variously modified and provided according to the needs of a user. 
     The load lock chamber  40  may be disposed between the transfer frame  220  and the transfer chamber  320 . The load lock chamber  40  provides a buffer space in which the substrate W or the ring member R is exchanged between the transfer frame  220  and the transfer chamber  320 . In an embodiment, to replace the ring member R disposed at the process chamber  50 , the ring member R used at the process chamber  50  may temporarily remain at the load lock chamber  40 . In an embodiment, in order to transfer a new ring member R scheduled to replace an old ring member R to the process chamber  50 , the new ring member R may temporarily remain at the load lock chamber  40 . 
     As mentioned above, an inner atmosphere of the transfer frame  220  may be maintained in an atmospheric pressure atmosphere, and the inner atmosphere of the transfer chamber  320  may be maintained in a vacuum pressure atmosphere. The load lock chamber  40  is disposed between the transfer frame  220  and the transfer chamber  320 , so that an inner atmosphere thereof may be converted between the atmospheric pressure atmosphere and a vacuum pressure atmosphere. 
     The controller  60  may comprise a process controller consisting of a microprocessor (computer) that executes a control of the substrate treating apparatus, a user interface such as a keyboard via which an operator inputs commands to manage the substrate treating apparatus, and a display showing the operation situation of the substrate treating apparatus, and a memory unit storing a treating recipe, i.e., a control program to execute treating processes of the substrate treating apparatus by controlling the process controller or a program to execute components of the substrate treating apparatus according to data and treating conditions. In addition, the user interface and the memory unit may be connected to the process controller. The treating recipe may be stored in a storage medium of the storage unit, and the storage medium may be a hard disk, a portable disk, such as a CD-ROM or a DVD, or a semiconductor memory, such as a flash memory. 
     The controller  60  may control the substrate treating apparatus  1  to perform a substrate treating method described below. For example, the controller  60  may control components provided to the process chamber  50  described later so as to perform the substrate treating method described below. 
     A plurality of process chambers  50  may be provided. The process chamber  50  may be a chamber that performs a process on the substrate W. The process chamber  50  may be a plasma chamber that treats the substrate W using a plasma. For example, the process chamber  50  may be a chamber performing an etching process of removing a thin film on the substrate W using the plasma, an ashing process of removing a photoresist film, a deposition process of forming a thin film on the substrate W, or a dry cleaning process. However, the inventive concept is not limited thereto, and a plasma treatment process performed at the process chamber  50  may be variously modified to a known plasma treatment process. 
       FIG.  2    schematically illustrates an embodiment of a process chamber of  FIG.  1   . Referring to  FIG.  2   , the process chamber  50  may treat a substrate W by transferring a plasma to the substrate W. The process chamber  50  may include a housing  510 , a support unit  520 , a gas supply unit  530 , a plasma source  540 , and a pressure adjusting unit  570 . 
     The housing  510  provides a treating space in which a substrate treating is performed therein. The housing  510  may be provided in a sealed shape. The housing  510  may be formed of a metal material. In an embodiment, the housing  510  may be made of an aluminum material. The housing  510  may be grounded. The substrate W and an inlet  512  through which a ring member R is taken in or out may be formed on a side of the housing  510 . The inlet  512  may be selectively opened and closed by a gate valve  514 . An exhaust hole  516  may be formed at the bottom surface of the housing  510 . The exhaust line  560  to be described later may be connected to the exhaust hole  516 . 
     A heater  518  is provided on a wall of the housing  510 . The heater  518  heats a wall of the housing  510 . The heater  518  is electrically connected to a heating power source (not shown). The heater  518  generates a heat by resisting a current applied from a heating power source (not shown). The heat generated from the heater  518  is transferred to the treating space to maintain the treating space at a predetermined temperature. The heater  518  may be provided as a coil-shaped heating wire. A plurality of heaters  518  may be provided on the wall of the housing  510 . 
     The support unit  520  is located within the housing  510 . The support unit  520  may be provided to be upwardly spaced apart from a bottom surface of the housing  510 . The support unit  520  supports the substrate W. The support unit  520  includes an electrostatic chuck that adsorbs the substrate W using an electrostatic force. In contrast, the support unit  520  may support the substrate W in various ways such as a vacuum adsorption or a mechanical clamping. Hereinafter, the support unit  520  including the electrostatic chuck will be described. 
     The support unit  520  may include an electrostatic chuck, an insulating plate  523 , a bottom body  524 , and a ring member R. The substrate may be mounted on the electrostatic chuck, and a high frequency power may be applied. The electrostatic chuck may include a dielectric plate  521  and an electrode plate  522 . 
     The dielectric plate  521  is located at the top end of the support unit  520 . The dielectric plate  521  may be provided as a generally disk-shaped dielectric substance. The substrate W is placed on a top surface of the dielectric plate  521 . When seen from above, a diameter of the top surface of the dielectric plate  521  is smaller than that of the substrate W. When the substrate W is placed on the top surface of the dielectric plate  521 , an edge area of the substrate W is located outside the dielectric plate  521 . An electrode  525  and a heater  526  are buried within the dielectric plate  521 . 
     The electrode  525  may be positioned above the heater  526 . The electrode  525  is electrically connected to a first power source  525   a.  The first power source  525   a  may include a DC power source. A first switch  525   b  is installed between the electrode  525  and the first power source  525   a.  The electrode  525  may be electrically connected to the first power source  525 . The electrode  525  may be electrically connected to the first power source  525   a  by on/off of the first switch  525   b.  When the first switch  525   b  is turned on, a DC current is applied to the electrode  525 . The electrostatic force acts between the electrode  525  and the substrate W by a current applied to the electrode  525 . Accordingly, the substrate W is adsorbed on the dielectric plate  521 . 
     The heater  526  is electrically connected to a second power source  526   a.  A second switch  526   b  may be installed between the heater  526  and the second power source  526   b.  The heater may be electrically connected to the second power source  526   a  by an on/off of the second switch  526   b.  The heater  526  generates a heat by resisting a current applied from the second power source  526   a.  A generated heat is transferred to the substrate W through the dielectric plate  521 . The substrate W may be maintained at a predetermined temperature by the heat generated from the heater  526 . The heater  526  may include a spiral coil. A plurality of heaters  526  are provided. The heater  526  may be provided in different regions of the dielectric plate  521 . For example, a heater  526  for heating a central region of the dielectric plate  521  and a heater  526  for heating an edge region of the dielectric plate  521  may be provided, and the heaters  526  may be independently controlled from each other. 
     In the above-described example, the heater  526  is provided within the dielectric plate  521 , but the inventive concept is not limited thereto, and the heater  526  may not be provided within the dielectric plate  521 . 
     The electrode plate  522  is located under the dielectric plate  521 . When seen from above, the electrode plate  522  may be provided in a disk shape. The electrode plate  522  may be made of a conductive material. In an embodiment, the electrode plate  522  may be made of an aluminum material. A top central region of the electrode plate  522  may have an area corresponding to a bottom surface of the dielectric plate  521 . 
     The electrode plate  522  may include a metal plate. According to an embodiment, an entire area of the electrode plate  522  may be provided as a metal plate. The electrode plate  522  may be electrically connected to a third power source  522   b.  The third power source  525   b  may be provided as a high frequency power source generating a high frequency power. The high frequency power source may be provided as an RF power source. The RF power source may be provided as a high bias power RF power source. The electrode plate  522  receives the high frequency power from the third power source  522   a.  For this reason, the electrode plate  522  may function as an electrode. In an embodiment, the electrode plate  522  may function as a bottom electrode. Also, the electrode plate  522  may be provided to be grounded. 
     A top fluid channel  527  and a bottom fluid channel  528  may be provided within the electrode plate  522 . The top fluid channel  527  is provided as a passage through which a heat transfer medium circulates. The top fluid channel may be formed in a spiral shape within the electrode plate  522 . The top fluid channel  527  is connected to a first fluid supply source  527   a  through a first fluid supply line  527   c.  The heat transfer medium is stored at the first fluid supply source  527   a.  The heat transfer medium may include an inert gas. In an embodiment, the heat transfer medium may be provided as a helium (He) gas. The helium gas is supplied to the top fluid channel  527  through the first fluid supply line  527   c.  The helium gas is supplied to a bottom surface of the substrate W through the top fluid channel  527 . The helium gas may serve as a medium through which a heat transferred from the plasma to the substrate W is transferred to the dielectric plate  521  and the ring member R. 
     The bottom fluid channel  528  is provided as a passage through which the heat transfer medium circulates. The bottom fluid channel  528  may be formed in a spiral shape within the electrode plate  522 . The bottom fluid channel  528  is connected to a second fluid supply source  528   a  through the second fluid supply line  528   c.  The heat transfer medium is stored in the second fluid supply source  528   a.  The heat transfer medium may be provided as a cooling fluid. In an embodiment, the cooling fluid may be provided as a cooling water. The cooling water is supplied to the bottom fluid channel  528  through the second fluid supply line  528   c.  The cooling water flows in the bottom fluid channel  528  and may cool the electrode plate  522 . 
     An insulating plate  523  is provided under the electrostatic chuck. An insulating plate  523  is provided under the electrode plate  522 . The insulating plate  523  is made of an insulating material, and electrically insulates the electrode plate  522  from a bottom body  524  to be described later. The insulating plate  523  may be provided in a generally circular plate shape when viewed from above. The insulating plate  523  may be provided with an area corresponding to that of the electrode plate  522 . 
     The bottom body  524  is provided under the electrode plate  522 . The bottom body  524  may be provided under the insulating plate  523 . The bottom body  524  may be provided in a ring shape when viewed from above. 
     The bottom body  524  has a connecting member  524   a.  The connecting member  524   a  connects an outer surface of the bottom body  524  with an inner sidewall of the housing  510 . A plurality of connecting members  524   a  may be provided on the outer surface of the bottom body  524  at regular intervals. The connecting member  524   a  supports the support unit  520  within the housing  510 . The connecting member  524   a  supports so that the support unit  520  is spaced apart a predetermined distance from the bottom surface of the housing  510 . 
     In addition, the connecting member  524   a  is connected to the inner sidewall of the housing  510 , so that the bottom body  524  is electrically grounded. A first power line  525   c  connected to the first power source  525   a,  a second power line  526   c  connected to the second power source  526   a,  a first fluid supply line  527   d  connected to the top fluid channel  527 , a second fluid supply line  528   c  connected to the bottom fluid channel  528 , and the like extends to an outside of the housing  510  through an inner space of the connecting member  524   a.    
     A substrate lifting/lowering module (not shown) for lifting and lowering the substrate W and a ring lifting/lowering module (not shown) for lifting and lowering the ring member R may be located in the inner space of the lower body  524 . The substrate W may move in a vertical direction between a process position and a transfer position by the substrate lifting/lowering module (not shown). The ring member R may move in the vertical direction between the process position and the transfer position by the ring lifting/lowering module (not shown). 
     The ring member R is disposed in an edge region of the support unit  520 . The ring member R may have a ring shape when viewed from above. The ring member R may have a shape in which a height of an inner top surface is lower than a height of an outer top surface. A bottom surface of an edge region of the substrate W may be placed on the inner top surface of the ring member R. In addition, the ring member R may have an inclined surface upwardly inclined from a center of the substrate W toward an outside of the substrate W between the inner top surface and the outer top surface. For this reason, if the substrate W is placed on the inner top surface of the ring member R, the substrate W may slide along the inclined surface of the ring member R and be placed properly on the inner top surface of the ring member R, even if the position is somewhat inaccurate. Unlike the above-described example, the ring member R according to an embodiment of the inventive concept may be modified and provided in various shapes. 
     The gas supply unit  530  supplies a process gas to the treating space of the housing  510 . The gas supply unit  530  may include a gas supply nozzle  532 , a gas supply line  534 , and a gas storage unit  536 . The gas supply nozzle  532  may be installed in a central area of a top surface of the housing  510 . An injection hole is formed on a bottom surface of the gas supply nozzle  532 . The injection hole supplies the process gas into the housing  510 . The gas supply line  534  connects the gas supply nozzle  532  and the gas storage unit  536 . The gas supply line  534  supplies a process gas stored at the gas storage unit  536  to the gas supply nozzle  532 . A valve  538  is installed at the gas supply line  534 . The valve  538  may adjust a flow rate of the process gas supplied through the gas supply line  534  by opening and closing the gas supply line  534 . 
     The plasma source  540  excites the process gas in the housing  510  into a plasma state. In an embodiment of the inventive concept, a capacitively coupled plasma (CCP) is used as the plasma source. However, the inventive concept is not limited thereto, and the process gas in the housing  510  may be excited in a plasma state by using an inductively coupled plasma (ICP) or a microwave plasma. Hereinafter, a case in which the capacitive coupled plasma (CCP) is used as the plasma source according to an embodiment of the inventive concept will be described as an example. 
     The capacitively coupled plasma source may include a top electrode and a bottom electrode within the housing  510 . The top electrode and the bottom electrode may be vertically disposed parallel to each other within the housing  510 . One of both electrodes may apply a high frequency power, and the other electrode may be grounded. Unlike this, both electrodes may apply a high frequency power. An electromagnetic field is formed in a space formed by a combination of both electrodes, and the process gas supplied to the space may be excited in the plasma state. A substrate treatment process is performed using the plasma. 
     According to an embodiment, the top electrode may be provided as a shower head unit  590  to be described later, and the bottom electrode may be provided as the aforementioned electrode plate  522 . A high frequency power may be applied to the top electrode and the bottom electrode, respectively. Alternatively, the high frequency power may be applied to the bottom electrode, and the top electrode may be grounded. For this reason, an electromagnetic field is generated between the top electrode and the bottom electrode. The generated electromagnetic field excites the process gas provided within the housing  510  into the plasma state. 
     The exhaust baffle  550  uniformly exhausts a plasma flowing in the treating space for each area. The exhaust baffle  550  is located in the treating space. The exhaust baffle  550  is positioned between the housing  510  and the support unit  520 . In an embodiment, the exhaust baffle  550  may be positioned between the inner wall of the housing  510  and the outer surface of the support unit  520  in the treating space. The exhaust baffle  550  is positioned above the exhaust hole  516  so that an exhaust with respect to the treating space is more uniformly performed. 
     The exhaust baffle  550  may have a substantially ring shape when viewed from above. At least one hole is formed in the exhaust baffle  550 . In an embodiment, a plurality of holes may be formed in the exhaust baffle  550 . The holes formed in the baffle  550  may extend from the top end to the bottom end of the baffle  550 . The holes formed in the baffle  550  may be arranged to be spaced apart from each other in a circumferential direction of the baffle  550 . 
     The exhaust line  560  may exhaust an atmosphere of the treating space. The exhaust line  560  may exhaust a process gas or process by-products supplied to the treating space to the outside of the housing  510 . The process gas or process by-products supplied to the treating space may be forcibly exhausted from the treating space through the exhaust line  560 . The exhaust line  560  is connected to the exhaust hole  516  formed on the bottom surface of the housing  510 . An opening/closing valve (not shown) and a depressurizing member  562  may be installed in the exhaust line  560 . The opening/closing valve (not shown) may be positioned upstream of the exhaust line  560  from the depressurizing member  562  based on an exhaust direction. The depressurizing member  562  may provide a negative pressure to the treating space. The depressurizing member  562  may be provided in various apparatuses which provide a known sound pressure. 
       FIG.  3    is a view schematically illustrating the pressure adjusting unit of  FIG.  2    as viewed from above. Referring to  FIGS.  2  and  3   , the pressure adjusting unit  570  adjusts an exhaust pressure exhausted from the exhaust line  560 . The pressure adjusting unit  570  may adjust the exhaust pressure exhausted from the exhaust line  560  by opening and closing the opening formed at the top end of the exhaust line  560 . For example, the pressure adjusting unit  570  may adjust an exhaust pressure by changing a relative height between the top end of the exhaust line  560  and the bottom end of the opening/closing member  571  to be described later. 
     The pressure adjusting unit  570  may be disposed inside the housing  510 . In an embodiment, the pressure adjusting unit  570  may be positioned between the support unit  520  and the exhaust line  560 . According to an embodiment of the inventive concept, the pressure adjusting unit  570  may be fixedly installed at a bottom end of the support unit  520 . For example, the body  575  of the lifting/lowering member  574  to be described later may be fixedly installed on a bottom surface of the lower body  524 . 
     The pressure adjusting unit  570  may include an opening/closing member  571 , a lifting/lowering member  574 , and an elastic member  578 . The opening/closing member  571  may open and close the exhaust line  560 . The opening/closing member  571  may include a base plate  572  and a stopper member  573 . 
     The base plate  572  may be provided in a substantially circular shape when viewed from above. The base plate  572  may be formed in a substantially disk shape. The base plate  572  may cover the exhaust line  560  when viewed from above. If the base plate  572  is located in a closed position which completely closes the exhaust line  560  by the lifting/lowering member  574 , which will be described later, a bottom surface of the base plate  572  may be in contact with the bottom surface of the housing  510 . The base plate  572  may be connected to the lifting/lowering member  574 . The base plate  572  is vertically movable in a space between a bottom end of the support unit  520  and the top end of the exhaust line  560  by the lifting/lowering member  574 . For example, a lifting/lowering rod  576  to be described later may be installed on a top surface of the base plate  572 , and may be moved in an upward and downward direction by the lifting/lowering rod  576 . 
     The stopper member  573  is formed to downwardly extend from the bottom end of the base plate  572 . The stopper member  573  may be formed in a cylindrical shape. A diameter of the stopper member  573  may be smaller than a diameter of the exhaust line  560 . Optionally, the diameter of the stopper member  573  may be the same as the diameter of the exhaust line  560 . A height of the stopper member  573  may be less than a height from the bottom end of the support unit  520  to a bottom surface of the housing  510 . For example, a vertical height from the top end of the base plate  572  to the bottom end of the stopper member  573  may be less than a vertical height from the bottom end of the support unit  520  to the bottom surface of the housing  510 . The base plate  572  and the stopper member  573  may be integrally formed. 
     The lifting/lowering member  574  moves the opening/closing member  571  in the vertical direction. In an embodiment, the lifting/lowering member  574  may be an actuator. The lifting/lowering member  574  may include a body  575 , a lifting/lowering rod  576 , and a fluid supply unit  577 . 
     The body  575  has an inner space in which a fluid is stored. The fluid may be stored in the inner space of the body  575 . The fluid supplied from the fluid supply unit  577  to be described later may be stored in the inner space of the body  575 . The body  575  may be formed in a cylindrical shape. The body  575  may be fixedly installed at the bottom end of the support unit  520 . In an embodiment, the body  575  may be installed in a center of the lower body  524 . A supply port (not shown) to which the fluid supply line  577   b  of the fluid supply unit  577  is connected may be formed on a top surface of the body  575 . 
     The lifting/lowering rod  576  is disposed in the inner space of the body  575 . The lifting/lowering rod  576  may be a piston. A lengthwise direction of the lifting/lowering rod  576  may be provided substantially perpendicular to the top surface of the base plate  572 . The lifting/lowering rod  576  may move up and down in an inner space. The bottom end of the lifting/lowering rod  576  may be coupled to the opening/closing member  571 . In an embodiment, the bottom end of the lifting/lowering rod  576  may be coupled to the center of the top end of the opening/closing member  571 . The lifting/lowering rod  576  may lift/lower the opening/closing member  571  by vertically moving according to an amount of fluid supplied to the inner space. 
     The fluid supply unit  577  may supply a fluid to the inner space of the body  575 . The fluid supply unit  577  may include a fluid storage unit  577   a,  a fluid supply line  577   b,  and an lifting/lowering valve  577   c.  The fluid storage unit  577   a  may store a fluid. Various types of liquids or gases may be used as the fluid according to an embodiment of the inventive concept. For example, the fluid stored in the fluid storage unit  577   a  may be a compressed dry air (CDA). 
     The fluid supply line  577   b  connects the fluid storage unit  577   a  and the inner space of the body  575 . In an embodiment, the fluid supply line  577   b  may connect the fluid storage unit  577   a  to a supply port (not shown) formed on a top end of the body  575 . The fluid may flow from the fluid storage unit  577   a  to the inner space of the body  575  through the fluid supply line  577   b.  The fluid supply line  577   b  extends outside the housing  510  through an inner space of the connection member  524   a.    
     The lifting/lowering valve  577   c  may be installed in the fluid supply line  577   b.  The lifting/lowering valve  577   c  may be provided as an opening/closing valve for opening/closing the fluid supply line  577   b.  However, the inventive concept is not limited thereto, and the lifting/lowering valve  577   c  may be provided as a flow rate control valve. If the lifting/lowering valve  577   c  opens the fluid supply line  577   b,  the fluid is supplied to the inner space of the body  575 . The fluid supplied to the inner space lowers the lifting/lowering rod  576  in a downward direction, and accordingly, the opening/closing member  571  descends. If the lifting/lowering valve  577   c  closes the fluid supply line  577   b,  the supply of fluid to the inner space of the body  575  is blocked. By stopping the supply of fluid to the inner space, the lifting/lowering rod  576  moves upward by an elastic force of the elastic member  578  described later, thereby lifting the opening/closing member  571 . 
     The elastic member  578  provides a restoring force to the lifting/lowering member  574 . In an embodiment, the elastic member  578  may provide the restoring force to the lifting/lowering member  574  so that the lifting/lowering rod  576  moves upward if the amount of fluid supplied to the inner space of the body  575  is reduced or a supply of the fluid is stopped. In an embodiment, the elastic member  578  may be provided as a bellows. The elastic member  578  may be provided by connecting a plurality of thin metal plates. The elastic member  578  may expand and contract according to a lifting/lowering of the opening/closing member  571  by the lifting/lowering member  574 . 
     The elastic member  578  may be disposed between the support unit  520  and the opening/closing member  571 . In an embodiment, an end of the elastic member  578  may be installed at a bottom end of the support unit  520 . In addition, the other end of the elastic member  578  may be installed on a top end of the base plate  572 . Accordingly, the elastic member  578  may connect the support unit  520  and the opening/closing member  571  to each other. 
     At least one elastic member  578  may be provided. In an embodiment, a plurality of elastic members  578  may be provided. The plurality of elastic members  578  may be disposed at equal intervals with respect to a central axis of the base plate  572 . For example, as shown in  FIG.  3   , three elastic members  578  may be provided, and the plurality of elastic members  578  may have a same diameter and may be disposed at 120° intervals based on the central axis of the base plate  572 . However, the inventive concept is not limited thereto, and an arrangement and spacing of the elastic member  578  may be variously modified as necessary. Since the plurality of elastic members  578  are arranged at equal intervals, the support unit  520  and the opening/closing member  571  may be stably connected to each other. Accordingly, if the opening/closing member  571  moves up and down, the horizontal may be stably maintained. 
     A shower head unit  590  may include a shower head  592 , a gas injection plate  594 , and a support unit  596 . The shower head  592  may be positioned to be downwardly spaced apart from the top surface of the housing  510  by a predetermined distance. A certain space may be formed between the gas injection plate  594  and the top surface of the housing  510 . The shower head  592  may be provided in a plate shape having a constant thickness. A bottom surface of the shower head  592  may be anodized to prevent a generation of an arc due to the plasma. A cross section of the shower head  592  may be provided to have a same form and a cross-sectional area as the support unit  520 . The shower head  592  includes a plurality of through holes  593 . A through hole  593  penetrates a top surface and the bottom surface of the shower head  592  in the up/down direction. The shower head  592  may include a metal material. The shower head  592  may be electrically connected to a fourth power source  592   a.  The fourth power source  592   a  may be provided as a high frequency power source. Alternatively, the shower head  592  may be electrically grounded. In an embodiment, the shower head  592  may function as a top electrode. 
     The gas injection plate  594  may be located on a top surface of the shower head  592 . The gas injection plate  594  may be positioned to be upwardly spaced apart from the top surface of the housing  510  by a predetermined distance. The gas injection plate  594  may be provided in a plate shape having a constant thickness. The gas injection plate  594  is provided with an injection hole  595 . The injection hole  595  penetrates the top surface and the bottom surface of the gas injection plate  594  in the up/down direction. The injection hole  595  is positioned opposite the through hole  593  of the shower head  592 . The gas injection plate  594  may include a metal material. 
     A support part  596  supports the side parts of the shower head  592  and the gas injection plate  594 . A top end of the support part  596  is connected to the top surface of the housing  510 , and a bottom end is connected to a side of the shower head  592  and the gas injection plate  594 . The support part  596  may include a non-metallic material. 
     According to an embodiment of the inventive concept, when viewed from above, the stopper member  573  extending from a bottom end of the base plate  572  and leading into the exhaust line  560  by being provided with a diameter smaller or the same as a diameter of the base plate  572  and the exhaust line  560  which covers the exhaust line  560  is provided in a poppet form. Accordingly, the exhaust line  560  may be completely closed by the base plate  572 , and an inner pressure of the treating space exhausted from the exhaust line  560  may be precisely adjusted by the stopper member  573 . 
     According to the above-described embodiment of the inventive concept, the lifting/lowering member  574  is fixedly installed at the bottom end of the support unit  520  and a single lifting/lowering member  574  is provided, thereby solving a structural complexity of the substrate treating apparatus  1 . 
     In addition, according to an embodiment of the inventive concept, the elastic member  578  connects the support unit  520  and the opening/closing member  571  to each other even if the opening/closing member  571  moves up and down, thereby stably maintaining a horizontal position of the opening/closing member  571 . A stability of the opening/closing member  571  may be secured. Accordingly, an inner pressure of the treating space exhausted through the exhaust line  560  may be precisely adjusted. In addition, if the fluid is not supplied to the lifting/lowering member  574 , or the amount of fluid supplied to the lifting/lowering member  574  decreases, the opening/closing member  571  may be lifted by the elastic force of the elastic member  578 . 
     Except for the additional description of the process chamber  50  described below, it is provided similarly to the description of the process chamber  50  described above with reference to  FIG.  2    to  FIG.  3   , and overlapping contents will be omitted for convenience of description.  FIG.  4    and  FIG.  5    are views schematically illustrating another embodiment of the process chamber of  FIG.  2   . The pressure adjusting unit  570  according to another embodiment of the inventive concept will be described in detail with reference to  FIG.  4    and  FIG.  5   . 
     Referring to  FIG.  4   , the pressure adjusting unit  570  may include an opening/closing member  571 , a lifting/lowering member  574 , and an elastic member  578 . The lifting/lowering member  574  according to an embodiment of the inventive concept moves the opening/closing member  571  in the vertical direction. In an embodiment, the lifting/lowering member  574  may include a lifting/lowering rod  576  and a driving unit  579 . The lifting/lowering rod  576  may be coupled to the driving unit  579  to move the opening/closing member  571  in the vertical direction. An end of the lifting/lowering rod  576  may be coupled to the driving unit  579 , and the other end of the lifting/lowering rod  576  may be coupled to the base plate  572 . The lifting/lowering rod  576  may be formed perpendicular to a top surface of the base plate  572 . The driving unit  579  may be coupled to the lifting/lowering rod  576  to lift the base plate  572  in the vertical direction. The driving unit  579  may be provided as a motor. For example, the driving unit  579  may be provided as a BLDC motor (Brushed Less DC motor). 
     Referring to  FIG.  5   , the pressure adjusting unit  570  may include an opening/closing member  571 , a lifting/lowering member  574 , an elastic member  578 , and a position sensor  580 . The position sensor  580  measures a position information of the opening/closing member  571 . In an embodiment, the position sensor  580  may be provided as a laser sensor. However, the inventive concept is not limited thereto, and may be provided as various sensors capable of measuring distance information of a specific member. 
     The position sensor  580  may be installed at a bottom end of the support unit  520 . The position sensor  580  may be installed at a bottom end of the lower body  524 . The position sensor  580  may measure a height distance from the bottom end of the support unit  520  to a top end of the opening/closing member  571 . For example, the position sensor  580  may measure a vertical distance from the bottom end of the lower body  524  to the top end of the base plate  572 . A measured vertical distance data is transmitted to the controller  60  to be described later. The controller  60  may calculate a current height of the opening/closing plate  572  from the vertical distance data. Accordingly, an opening degree of the top opening of the exhaust line  560  may be calculated from a currently positioned height of the opening/closing plate  572 . 
     Hereinafter, a substrate treating method according to an embodiment of the inventive concept will be described in detail. The substrate treating method described below may be performed by the process chamber  50  described above. In addition, the controller  60  may control the components of the process chamber  50  so that the process chamber  50  may perform the substrate treating method described below. For example, the controller  60  may generate a control signal for controlling at least one of the components of the elevation member  578  so that the components of the pressure adjusting unit  570  may perform the substrate treating method described below. 
       FIG.  6    is a flowchart of a substrate treating method according to an embodiment of the inventive concept.  FIG.  7    schematically illustrates a substrate taking-in step of the substrate in  FIG.  6   .  FIG.  8    and  FIG.  9    schematically illustrating a state of adjusting an inner pressure of the process chamber in a process step of  FIG.  6   .  FIG.  10    schematically illustrates a step of carrying out the substrate of  FIG.  6   .  FIG.  11    schematically illustrates an exhaust step of  FIG.  6   . 
     Referring to  FIGS.  6  to  11   , a substrate treating method according to an embodiment of the inventive concept may include a substrate taking-in step S 100 , a process step S 200 , a substrate taking-out step S 300 , and an exhaust step S 400 . 
     Referring to  FIG.  7   , the substrate taking-in step S 100  is a step in which the substrate W is taken into the treating space inside the process chamber  50 . In the substrate taking-in step S 100 , the inlet  512  formed on a side wall of the process chamber  50  is opened by the gate valve  514 . In the substrate taking-in step S 100 , the substrate W is taken into the process chamber  50  through the inlet  512  by the second transfer robot  340 . The substrate W taken into the process chamber  50  is placed on the support unit  520 . For example, the substrate W taken into the process chamber  50  may be mounted on the top surface of the dielectric plate  521 . When the substrate W is seated on the support unit  520 , process step S 200  is performed. 
     Referring to  FIG.  7   , the process step S 200  is a step of performing a predetermined treatment on the substrate W. In an embodiment, in the process step S 200 , a plasma treatment may be performed on the substrate W. In the process step S 200 , an atmosphere of the treating space may be generally formed as a vacuum. However, the inventive concept is not limited to it, and in the process step S 200 , the atmosphere of the treating space can be variously adjusted in accordance with the treatment conditions of the substrate W. 
     In the process step S 200 , the gate valve  514  closes the inlet  512  formed on a side wall of the process chamber  50  to seal the treating space. In the process step S 200 , the atmosphere of the treating space may be exhausted. The atmosphere of the treating space is exhausted through the exhaust line  560 . In the process step S 200 , a plasma treatment may be performed on the substrate W while adjusting the inner pressure of the treating space. The inner pressure of the treating space is adjusted by the lifting/lowering member  574 . According to an embodiment of the inventive concept, an inner atmosphere of the treating space exhausted through the exhaust line  560  may be adjusted by adjusting an amount of fluid supplied to the lifting/lowering member  574  to adjust a relative height between the bottom end of the base plate  572  and the top end of the exhaust line  560 . 
     In the process step S 200 , an opening degree of the exhaust line  560  may be calculated based on a current height data of the opening/closing member  571  measured by the position sensor  580 . The inner pressure of the treating space of the process chamber  50  may be determined based on the degree of opening of the exhaust line  560 . The lifting/lowering member  574  is lifted and lowered according to the inner pressure of the treating space of the process chamber  50  required for treating the substrate W. As the lifting/lowering member  574  lifts and lowers, the opening/closing member  571  lifts and lowers, and an opening degree of the exhaust line  560  is determined. 
     In an embodiment, as shown in  FIG.  8   , if it is necessary to reduce the inner pressure of the treating space of the process chamber  50 , the lifting/lowering valve  577   c  is opened and the amount of fluid supplied to the inner space of the body  575  is relatively reduced. Accordingly, the lifting/lowering rod  576  moves upward by the elastic force of the elastic member  578 , and the opening/closing member  571  rises. Accordingly, the inner atmosphere of the treating space flowing to the exhaust line  560  is relatively increased, and the inner pressure of the treating space is decreased. 
     In an embodiment, as shown in  FIG.  9   , if the inner pressure of the treating space of the process chamber  50  is increased, the lifting/lowering valve  577   c  is opened, and the supply of the fluid supplied to the inner space of the body  575  is relatively increased, so that the lifting/lowering rod  576  moves downward and the opening/closing member  571  is lowered. As the opening/closing member  571  descends, the stopper member  573  narrows an inner passage providing the exhaust space in the exhaust line  560 . Accordingly, the inner atmosphere of the treating space flowing to the exhaust line  560  is relatively reduced, and the inner pressure of the treating space increases. 
     Referring to  FIG.  10   , the substrate taking out step S 300  is a step of taking out the substrate W from the process chamber  50  after the process step S 200  is completed. In the substrate taking-out step S 300 , the inlet  512  formed on a side wall of the process chamber  50  is opened by the gate valve  514 . In the substrate taking-out step S 300 , the substrate W is taken out of the process chamber  50  through the inlet  512  by the second transfer robot  340 . 
     Referring to  FIG.  11   , the exhaust step S 400  exhausts the atmosphere of the treating space. In the exhaust step S 400 , various by-products and particles generated in the process step S 200  are exhausted through the exhaust line  560 . In the exhaust step S 400 , the inlet  512  formed on a side wall of the process chamber  50  is closed. In the exhaust step S 400 , the lifting/lowering valve  577   c  is closed to block the supply of the fluid supplied to the inner space of the body  575 . The lifting/lowering member  574  may rise upward by blocking the supply of fluid and by the restoring force of the elastic member  578 . Accordingly, the opening/closing member  571  is also lifted in the upward direction. As the opening/closing member  571  is lifted to be spaced apart from the top end of the exhaust line  560 , the exhaust line  560  is completely opened. Accordingly, the inner atmosphere of the treating space of the process chamber  50  is exhausted through the exhaust line  560 , and accordingly, various by-products or particles flowing in the treating space are exhausted through the exhaust line  560 . 
     According to an embodiment of the inventive concept, when viewed from above, the stopper member  573  extending from a bottom end of the base plate  572  and leading into the exhaust line  560  by being provided with a diameter smaller or the same as a diameter of the base plate  572  and the exhaust line  560  which covers the exhaust line  560  is provided in a poppet form. Accordingly, the exhaust line  560  may be completely closed by the base plate  572 , and an inner pressure of the treating space exhausted from the exhaust line  560  may be precisely adjusted by the stopper member  573 . 
     Accordingly, the exhaust line  560  may be completely closed by the base plate  572 , and the inner pressure of the treating space exhausted from the exhaust line  560  may be precisely controlled by forming the exhaust path of the exhaust line  560  by the stopper member  573 . 
     According to the above-described embodiment of the inventive concept, the lifting/lowering member  574  is fixedly installed at the bottom end of the support unit  520  and a single lifting/lowering member  574  is provided, thereby solving a structural complexity of the substrate treating apparatus  1 . 
     In addition, according to an embodiment of the inventive concept, the elastic member  578  connects the support unit  520  and the opening/closing member  571  to each other even if the opening/closing member  571  moves up and down, thereby stably maintaining a horizontal position of the opening/closing member  571 . A stability of the opening/closing member  571  may be secured. Accordingly, the inner pressure of the treating space exhausted through the exhaust line  560  may be precisely adjusted. In addition, if the fluid is not supplied to the lifting/lowering member  574 , or the amount of fluid supplied to the lifting/lowering member  574  decreases, the opening/closing member  571  may be lifted by the elastic force of the elastic member  578 . 
     The effects of the inventive concept are not limited to the above-mentioned effects, and the unmentioned effects can be clearly understood by those skilled in the art to which the inventive concept pertains from the specification and the accompanying drawings. 
     Although the preferred embodiment of the inventive concept has been illustrated and described until now, the inventive concept is not limited to the above-described specific embodiment, and it is noted that an ordinary person in the art, to which the inventive concept pertains, may be variously carry out the inventive concept without departing from the essence of the inventive concept claimed in the claims and the modifications should not be construed separately from the technical spirit or prospect of the inventive concept.