Patent Publication Number: US-2022238346-A1

Title: Substrate processing apparatus, substrate processing method, and non-transitory computer-readable storage medium

Description:
TECHNICAL FIELD 
     The present invention relates to a technique in which a substrate such as a semiconductor wafer, a substrate for a liquid crystal display, a substrate for a plasma display, a substrate for an organic EL, a substrate for a field emission display (FED), a substrate for an optical display, a substrate for a magnetic disk, a substrate for a magneto-optical disk, a substrate for a photomask, or a substrate for a solar cell is treated with a treatment liquid. 
     BACKGROUND ART 
     For example, there is known a substrate processing apparatus that performs various types of treatment on a substrate by sequentially discharging various types of treatment liquid toward the substrate while rotating the substrate about a virtual axis along a vertical direction in a state of holding the substrate in a horizontal posture by a holding unit (for example, Patent Document 1 and the like). Here, the various types of treatment include, for example, etching using a chemical liquid, cleaning using a rinse liquid, and the like. 
     In such a substrate processing apparatus, for example, a treatment liquid such as a chemical liquid and a rinse liquid scattered from the substrate is received and recovered by a cup provided around the holding unit. 
     PRIOR ART DOCUMENT 
     Patent Document 
     Patent Document 1: Japanese Patent Application Laid-Open No. 2018-121024 
     SUMMARY 
     Problem to be Solved by the Invention 
     However, in the substrate processing apparatus of Patent Document 1 described above, for example, there is a case where a splash in which a large amount of minute droplets splash is generated by collision of droplets scattered from the substrate with droplets adhering to the inner wall surface of the cup. When minute droplets generated here adhere to the substrate, contamination of the surface of the substrate due to adhesion of fine dust, dissolution of the surface of the substrate due to minute droplets of the chemical liquid, and the like occur, and the quality of the substrate may be deteriorated. 
     The present invention has been made in view of the above problems, and an object thereof is to provide a substrate processing technique capable of improving the quality of a substrate. 
     Means to Solve the Problem 
     In order to solve the above problem, a substrate processing apparatus according to a first aspect includes a substrate holding unit, a first drive unit, a chemical liquid discharge portion, a cup unit, a second drive unit, and a control unit. The substrate holding unit holds a substrate having a first surface and a second surface opposite to the first surface in a horizontal posture. The first drive unit rotates the substrate holding unit about a virtual axis. The chemical liquid discharge portion discharges a chemical liquid toward the first surface of the substrate held by the substrate holding unit. The cup unit surrounds a periphery of the substrate holding unit. The second drive unit changes a relative position in the vertical direction of the cup unit with respect to the substrate holding unit. The control unit, while causing the first drive unit to rotate the substrate holding unit about the virtual axis and causing the chemical liquid discharge portion to discharge the chemical liquid toward the first surface of the substrate held by the substrate holding unit to execute a chemical liquid treatment of treating the first surface, causes the second drive unit to change a relative position in the vertical direction of the cup unit with respect to the substrate holding unit. 
     A substrate processing apparatus according to a second aspect is the substrate processing apparatus according to the first aspect, in which the control unit, in a chemical liquid treatment period from a first timing at which execution of the chemical liquid treatment is started to a second timing at which the execution of the chemical liquid treatment is ended, performs control so as to cause the second drive unit to move a relative position in the vertical direction of the cup unit with respect to the substrate holding unit in a downward direction and not to move it in an upward direction. 
     A substrate processing apparatus according to a third aspect is the substrate processing apparatus according to the second aspect, in which the control unit, in the chemical liquid treatment period, in order to scatter a droplet of the chemical liquid from the substrate toward a dried portion of an inner wall surface of the cup unit, controls a speed at which the second drive unit moves a relative position in the vertical direction of the cup unit with respect to the substrate holding unit in the downward direction. 
     A substrate processing apparatus according to a fourth aspect is the substrate processing apparatus according to the second or third aspect, in which the control unit, after the second timing, performs control so as to stop movement of the relative position in the vertical direction of the cup unit with respect to the substrate holding unit in the downward direction by the second drive unit. 
     A substrate processing apparatus according to a fifth aspect is the substrate processing apparatus according to any one of the second to fourth aspects, in which the control unit, before the first timing, performs control so as to start movement of the relative position in the vertical direction of the cup unit with respect to the substrate holding unit in the downward direction by the second drive unit. 
     A substrate processing apparatus according to a sixth aspect is the substrate processing apparatus according to the first aspect, in which the control unit, during execution of the chemical liquid treatment, performs control so as to alternately execute a first operation and a second operation. In the first operation, the second drive unit moves a relative position in the vertical direction of the cup unit with respect to the substrate holding unit in a downward direction. In the second operation, a relative position in the vertical direction of the cup unit with respect to the substrate holding unit is made to move in an upward direction. 
     A substrate processing apparatus according to a seventh aspect is the substrate processing apparatus according to the sixth aspect, in which the control unit, during execution of the chemical liquid treatment, when causing the second drive unit to execute the second operation, stops discharge of the chemical liquid toward the first surface of the substrate held by the substrate holding unit by the chemical liquid discharge portion. 
     A substrate processing apparatus according to an eighth aspect is the substrate processing apparatus according to the sixth or seventh aspect, in which the control unit, before causing the second drive unit to stop execution of the first operation and the second operation, stops discharge of the chemical liquid toward the first surface of the substrate held by the substrate holding unit by the chemical liquid discharge portion. 
     A substrate processing apparatus according to a ninth aspect is the substrate processing apparatus according to any one of the sixth to eighth aspects, in which the control unit, after causing the second drive unit to start execution of the first operation and the second operation, starts discharge of the chemical liquid toward the first surface of the substrate held by the substrate holding unit by the chemical liquid discharge portion. 
     A substrate processing apparatus according to a tenth aspect is the substrate processing apparatus according to any one of the first to ninth aspects, and includes a cleaning liquid discharge portion that discharges a cleaning liquid toward the first surface of the substrate held by the substrate holding unit. Here, the control unit, after execution of the chemical liquid treatment, while causing the first drive unit to rotate the substrate holding unit about the virtual axis and causing the cleaning liquid discharge portion to discharge the cleaning liquid toward the first surface of the substrate held by the substrate holding unit to execute a cleaning treatment of cleaning the first surface, causes the second drive unit to change a relative position in the vertical direction of the cup unit with respect to the substrate holding unit. 
     A substrate processing apparatus according to an eleventh aspect is the substrate processing apparatus according to any one of the first to ninth aspects, and includes a cleaning liquid discharge portion that discharges a cleaning liquid toward the first surface of the substrate held by the substrate holding unit, and a gas discharge portion that discharges a gas toward the first surface of the substrate held by the substrate holding unit. Here, the control unit sequentially executes the chemical liquid treatment, a cleaning treatment, and a drying treatment. In the cleaning treatment, while the first drive unit rotates the substrate holding unit about the virtual axis, the cleaning liquid discharge portion discharges the cleaning liquid toward the first surface of the substrate held by the substrate holding unit to clean the first surface. In the drying treatment, while the first drive unit rotates the substrate holding unit about the virtual axis, the gas discharge portion discharges the gas toward the first surface of the substrate held by the substrate holding unit to dry the first surface. Here, the control unit, while executing the drying treatment, causes the second drive unit to change a relative position in the vertical direction of the cup unit with respect to the substrate holding unit. 
     A substrate processing apparatus according to a twelfth aspect is the substrate processing apparatus according to any one of the first to eleventh aspects, in which the control unit, after completion of execution of the chemical liquid treatment on a first substrate, prohibits start of execution of the chemical liquid treatment on a second substrate next to the first substrate until a preset time required for drying the cup unit elapses. 
     A substrate processing apparatus according to a thirteenth aspect is the substrate processing apparatus according to any one of the first to twelfth aspects, and includes a protective portion capable of covering the second surface of the substrate held by the substrate holding unit. Here, the control unit, when executing the chemical liquid treatment, causes the protective portion to cover the second surface without discharging liquid onto the second surface. 
     A substrate processing method according to a fourteenth aspect is a substrate processing method in a substrate processing apparatus, in which the substrate processing apparatus includes a processing unit and a control unit that controls an operation of the processing unit. The processing unit has a substrate holding unit, a first drive unit, a chemical liquid discharge portion, a cup unit, and a second drive unit. The substrate holding unit can hold a substrate having a first surface and a second surface opposite to the first surface in a horizontal posture. The first drive unit can rotate the substrate holding unit about a virtual axis. The chemical liquid discharge portion can discharge a chemical liquid toward the first surface of the substrate held by the substrate holding unit. The cup unit surrounds a periphery of the substrate holding unit. The second drive unit can change a relative position in the vertical direction of the cup unit with respect to the substrate holding unit. The substrate processing method includes a first step and a second step. In the first step, the control unit, while causing the first drive unit to rotate the substrate holding unit about the virtual axis, causes the chemical liquid discharge portion to discharge the chemical liquid toward the first surface of the substrate held by the substrate holding unit to execute a chemical liquid treatment of treating the first surface. In the second step, the control unit, during execution of the chemical liquid treatment in the first step, causes the second drive unit to change a relative position in the vertical direction of the cup unit with respect to the substrate holding unit. 
     A program according to a fifteenth aspect is executed by a control unit included in a substrate processing apparatus to cause the substrate processing apparatus to function as the substrate processing apparatus according to any one of the first to thirteenth aspects. 
     A computer-readable storage medium storing a program according to a sixteenth aspect is a computer-readable storage medium in which the program, when executed by a processor of a control unit in a substrate processing apparatus including a processing unit and the control unit that controls an operation of the processing unit, implements a first step and a second step. The processing unit has a substrate holding unit, a first drive unit, a chemical liquid discharge portion, a cup unit, and a second drive unit. The substrate holding unit can hold a substrate having a first surface and a second surface opposite to the first surface in a horizontal posture. The first drive unit can rotate the substrate holding unit about a virtual axis. The chemical liquid discharge portion can discharge a chemical liquid toward the first surface of the substrate held by the substrate holding unit. The cup unit surrounds a periphery of the substrate holding unit. The second drive unit can change a relative position in the vertical direction of the cup unit with respect to the substrate holding unit. In the first step, the control unit, while causing the first drive unit to rotate the substrate holding unit about the virtual axis, causes the chemical liquid discharge portion to discharge the chemical liquid toward the first surface of the substrate held by the substrate holding unit to execute chemical liquid treatment of treating the first surface. In the second step, the control unit, during execution of the chemical liquid treatment in the first step, causes the second drive unit to change a relative position in the vertical direction of the cup unit with respect to the substrate holding unit. 
     Effects of the Invention 
     By any of the substrate processing apparatus according to the first to thirteenth aspects, the substrate processing method according to the fourteenth aspect, the program according to the fifteenth aspect, and the computer-readable storage medium according to the sixteenth aspect, for example, when a treatment using a chemical liquid is performed on a substrate, a region that receives droplets of the chemical liquid scattered from the rotating substrate on the inner wall surface of the cup unit moves in the vertical direction. Thus, for example, the droplets of the chemical liquid scattered from the rotating substrate are less likely to collide with droplets adhering to the inner wall surface of the cup unit. As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface of the cup unit is less likely to occur, and the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to any one of the second to fifth aspects, for example, when the chemical liquid treatment is executed, the relative position in the vertical direction of the cup unit with respect to the substrate holding unit moves in the downward direction, so that the droplets of the chemical liquid scattered from the rotating substrate are less likely to collide with the droplets adhering to the inner wall surface of the cup unit. Therefore, for example, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur, and the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to the third aspect, for example, in a dry region of the inner wall surface of the cup unit, even if the chemical liquid scattered from the rotating substrate is received, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur. Therefore, for example, the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to the fourth aspect, for example, after the scattering of the droplets of the chemical liquid from the rotating substrate toward the cup unit is finished, the movement of the relative position in the vertical direction of the cup unit with respect to the substrate holding unit in the downward direction is stopped. Therefore, for example, the droplets of the chemical liquid scattered from the rotating substrate are less likely to collide with the droplets adhering to the inner wall surface of the cup unit. As a result, for example, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur, and the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to the fifth aspect, for example, droplets of the chemical liquid scattered from the rotating substrate are less likely to continuously collide with the same portion of the inner wall surface of the cup unit. As a result, for example, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur, and the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to any one of the sixth to ninth aspects, for example, during execution of the chemical liquid treatment, a region of the inner wall surface of the cup unit that receives the droplets of the chemical liquid scattered from the rotating substrate changes. Therefore, for example, the droplets of the chemical liquid scattered from the rotating substrate are less likely to collide with the droplets adhering to the inner wall surface of the cup unit. As a result, for example, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur, and the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to the seventh aspect, for example, during execution of the chemical liquid treatment, when the relative position in the vertical direction of the cup unit with respect to the substrate holding unit moves in the upward direction, droplets of the chemical liquid are less likely to scatter from the rotating substrate toward the cup unit. Thus, the droplets of the chemical liquid scattered from the rotating substrate are less likely to collide with the droplets adhering to the inner wall surface of the cup unit. As a result, for example, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur, and the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to any one of the eighth and ninth aspects, for example, droplets of the chemical liquid scattered from the rotating substrate are less likely to continuously collide with the same portion of the inner wall surface of the cup unit. As a result, for example, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur, and the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to the tenth aspect, for example, when the substrate is cleaned after the chemical liquid treatment, the droplet of the cleaning liquid scattered from the rotating substrate is received in a wide range of the inner wall surface of the cup unit by changing the relative position in the vertical direction of the cup unit with respect to the substrate holding unit. Therefore, for example, the chemical liquid adhering to the inner wall surface of the cup unit by the chemical liquid treatment can be washed away with the cleaning liquid. Thus, for example, the amount of the chemical liquid adhering to the inner wall surface of the cup unit when the chemical liquid treatment is executed on the next substrate can be reduced. As a result, for example, in the chemical liquid treatment for the next substrate, when the inner wall surface of the cup unit receives the droplets of the chemical liquid scattered from the rotating substrate, the splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur. Therefore, for example, the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to the eleventh aspect, for example, when the substrate is subjected to the drying treatment after execution of the chemical liquid treatment and the cleaning treatment on the substrate, the relative position in the vertical direction of the cup unit with respect to the substrate holding unit is changed, so that a gas flowing from above the first surface of the rotating substrate is blown over a wide range of the inner wall surface of the cup unit. Therefore, for example, the inner wall surface of the cup unit can be dried over a wide range. Thus, for example, during execution of the chemical liquid treatment on the next substrate, the drier inner wall surface of the cup unit can receive the droplets of the chemical liquid scattered from the rotating next substrate. As a result, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur, and the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to the twelfth aspect, for example, by sufficiently drying the cup unit, during execution of the chemical liquid treatment on the next substrate, when the inner wall surface of the cup unit receives the droplets of the chemical liquid scattered from the rotating substrate, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur. Therefore, for example, the quality of the substrate can be improved. 
     According to the substrate processing apparatus according to the thirteenth aspect, for example, when the second surface is in the dry state and the chemical liquid treatment is executed on the first surface, a splash in which a large amount of minute droplets splash from the inner wall surface of the cup unit is less likely to occur. Therefore, for example, a problem that minute droplets of the chemical liquid adhere to the second surface to be maintained in a dry state and the quality of the second surface is deteriorated is unlikely to occur. As a result, for example, the quality of the substrate can be improved. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a plan view illustrating an example of a schematic configuration of a substrate processing apparatus according to a first embodiment. 
         FIG. 2  is a block diagram illustrating a configuration example of a control unit. 
         FIG. 3  is a side view schematically illustrating a configuration example of a processing unit. 
         FIG. 4  is a side view schematically illustrating a configuration example of the processing unit. 
         FIG. 5  is an enlarged view illustrating an example of a cross section of a lower supply portion and a portion in the vicinity of the lower supply portion. 
         FIG. 6  is a schematic block diagram illustrating an example of a gas-liquid supply portion. 
         FIG. 7  is a diagram illustrating an example of a flow of processing using the processing unit. 
         FIGS. 8( a ) and 8( b )  are views schematically illustrating a change in a position of a cup unit at the time of executing substrate processing. 
         FIGS. 9( a ) to 9( c )  are timing charts illustrating a change in the position of the cup unit at the time of executing a chemical liquid treatment. 
         FIGS. 10( a ) and 10( b )  are timing charts illustrating a change in the position of the cup unit at the time of executing a cleaning treatment. 
         FIGS. 11( a ) and 11( b )  are timing charts illustrating a change in the position of the cup unit at the time of executing a drying treatment. 
         FIG. 12  is a diagram illustrating an example of a flow of processing using a processing unit according to a first modification. 
         FIGS. 13( a ) and 13( b )  are views schematically illustrating an example of a change in a position of a cup unit in a processing unit according to a second modification. 
         FIG. 14  is a timing chart illustrating a change in the position of the cup unit at the time of executing a pre-pure water treatment and a chemical liquid treatment according to the second modification. 
         FIG. 15  is a schematic block diagram illustrating an example of a gas-liquid supply portion according to a third modification. 
         FIG. 16  is a side view schematically illustrating a configuration example of a processing unit according to the third modification. 
         FIGS. 17( a ) and 17( b )  are views schematically showing an example of a change in a position of a cup unit at the time of executing substrate processing according to the third modification. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The components described in each embodiment are merely examples, and are not intended to limit the scope of the present invention only to them. The drawings are only schematically illustrated. In the drawings, the dimensions and the number of parts may be exaggerated or simplified as necessary for easy understanding. In the drawings, portions having similar configurations and functions are denoted by the same reference numerals, and redundant description is appropriately omitted. A right-handed XYZ coordinate system is attached to each of  FIGS. 1, 3 to 5, 8 ( a ),  8 ( b ),  13 ( a ),  13 ( b ), and  16  to  17 ( b ). In this XYZ coordinate system, one direction along the horizontal direction is a +X direction, a direction along the vertical direction (also referred to as a downward direction) is a −Z direction, and a direction orthogonal to both the +X direction and the +Z direction (also referred to as an upward direction) is a +Y direction. 
     1. First Embodiment 
     &lt;1-1. Substrate Processing Apparatus&gt; 
     The configuration of a substrate processing apparatus  100  will be described with reference to  FIG. 1 . 
       FIG. 1  is a plan view illustrating an example of a schematic configuration of a substrate processing apparatus  100  according to a first embodiment. 
     For example, the substrate processing apparatus  100  can continuously perform processing on a plurality of substrates W one by one. In the following description, it is assumed that the substrate W to be processed in the substrate processing apparatus  100  is, for example, a circular semiconductor wafer. 
     The substrate processing apparatus  100  includes, for example, a plurality of cells (specifically, an indexer cell  110  and a processing cell  120 ) arranged in parallel, and a control unit  2  that controls respective operation mechanisms and the like included in the plurality of cells  110 ,  120 . 
     For example, the indexer cell  110  can deliver an untreated substrate W received from the outside of the apparatus to the processing cell  120  and carry out the treated substrate W received from the processing cell  120  to the outside of the apparatus. The indexer cell  110  includes, for example, carrier stages  111  on which a plurality of carriers C can be placed, and a substrate conveying apparatus (transfer robot) IR capable of carrying the substrate W into and out of each carrier C. 
     For example, the carrier C storing one or more untreated substrates W can be placed onto the carrier stage  111  from the outside of the substrate processing apparatus  100  by OHT (Overhead Hoist Transfer) or the like. For example, the untreated substrates W can be taken out one by one from the carrier C, treated in the substrate processing apparatus  100 , and the treated substrates W treated in the substrate processing apparatus  100  can be stored in the carrier C again. The carrier C storing the treated substrate W can be carried out of the substrate processing apparatus  100  by OHT or the like. As described above, the carrier stage  111  functions as, for example, a substrate accumulating unit capable of accumulating the untreated substrate W and the treated substrate W. Here, the carrier C may be, for example, any of a front opening unified pod (FOUP) that stores the substrate W in a sealed space, a standard mechanical interface (SMIF) pod, and an open cassette (OC) that exposes the stored substrate W to the outside air. 
     The transfer robot IR includes, for example, a hand  112  capable of holding the substrate W in a horizontal posture (a posture in which the main surface of the substrate W is horizontal) by supporting the substrate W from below, and a hand drive mechanism  113  capable of driving the hand  112 . For example, the transfer robot IR can take out the untreated substrate W from the carrier C placed on the carrier stage  111 , and deliver the taken out substrate W to a conveyance robot CR described later at a substrate delivery position P. For example, the transfer robot IR can receive the treated substrate W from the conveyance robot CR at the substrate delivery position P, and store the received substrate W in the carrier C placed on the carrier stage  111 . 
     The processing cell  120  can perform processing on the substrate W, for example. The processing cell  120  includes, for example, a plurality of processing units  1  and a substrate conveying apparatus (conveyance robot CR) capable of carrying in and out the substrate W to and from the plurality of processing units  1 . Here, for example, a plurality of (for example, three) processing units  1  are stacked in the vertical direction to constitute one processing unit group  130 . For example, a plurality of (in the example of  FIG. 1 , four) processing unit groups  130  are positioned in a cluster shape so as to surround the conveyance robot CR. 
     Each of the plurality of processing units  1  includes, for example, a processing chamber  140  forming a processing space therein. In the processing chamber  140 , for example, a carry-in/out port  15  for inserting a hand  121  of the conveyance robot CR into the processing chamber  140  is formed. Therefore, for example, the processing unit  1  is positioned such that the carry-in/out port  15  faces a space where the conveyance robot CR is disposed. A specific configuration of the processing unit  1  will be described later. 
     The conveyance robot CR includes, for example, a hand  121  capable of holding the substrate W in a horizontal posture by supporting the substrate W from below, and a hand drive mechanism  122  capable of driving the hand  121 . Here, the conveyance robot CR (specifically, the base of the conveyance robot CR) is positioned, for example, substantially at the center of a space surrounded by the plurality of processing unit groups  130 . For example, the conveyance robot CR can take out the treated substrate W from the designated processing unit  1  and deliver the taken-out substrate W to the transfer robot IR at the substrate delivery position P. For example, the conveyance robot CR can receive the untreated substrate W from the transfer robot IR at the substrate delivery position P and convey the received substrate W to the designated processing unit  1 . 
     In addition, the substrate processing apparatus  100  has, for example, a configuration for supplying a chemical liquid, pure water, isopropyl alcohol (IPA), and a gas to be used at the time of executing various types of processing in each processing unit  1 . For example, the substrate processing apparatus  100  includes a pipe connected to a chemical liquid supply source  71 , a valve that opens and closes a flow path of the chemical liquid from the chemical liquid supply source  71  to each processing unit  1 , and the like ( FIG. 6 ). The chemical liquid supply source  71  includes, for example, a tank storing a chemical liquid and a mechanism such as a pump for feeding the chemical liquid from the tank. As the chemical liquid, for example, a liquid capable of etching the substrate W, such as a hydrofluoric peroxide mixture (FPM), diluted hydrofluoric acid (DHF), or phosphoric acid, is applied. In addition, for example, the substrate processing apparatus  100  includes a pipe connected to a pure water supply source  72 , a valve that opens and closes a flow path of pure water (de-ionized water (DIW)) from the pure water supply source  72  to each processing unit  1 , and the like ( FIG. 6 ). The pure water supply source  72  includes, for example, a tank storing pure water and a mechanism such as a pump for feeding pure water from the tank. In addition, for example, the substrate processing apparatus  100  includes a pipe connected to an IPA supply source  73 , a valve that opens and closes a flow path of IPA from the IPA supply source  73  to each processing unit  1 , and the like ( FIG. 6 ). The IPA supply source  73  includes, for example, a tank storing IPA and a mechanism such as a pump for feeding IPA from the tank. In addition, for example, the substrate processing apparatus  100  includes a pipe connected to a gas supply source  74 , a valve that opens and closes a flow path of a gas from the gas supply source  74  to each processing unit  1 , and the like ( FIG. 6 ). The gas supply source  74  includes, for example, a tank storing gas or a tank and a structure such as a pressure adjustment valve that adjusts the pressure of the gas, and the like. As the gas, for example, an inert gas such as nitrogen (N 2 ) gas is applied. The chemical liquid supply source  71 , the pure water supply source  72 , the IPA supply source  73 , and the gas supply source  74  may be provided in the substrate processing apparatus  100 , may be provided in common for the plurality of substrate processing apparatuses  100 , or may be installed in a factory in which the substrate processing apparatus  100  is installed. 
     For example, the control unit  2  can control the operation of each unit including each processing unit  1  in the substrate processing apparatus  100 .  FIG. 2  is a block diagram illustrating a configuration example of the control unit  2 . The control unit  2  is implemented by, for example, a general computer or the like, and includes a communication unit  201 , an input unit  202 , an output unit  203 , a storage unit  204 , a processing unit  205 , and a drive  206  which are connected via a bus line  200 Bu. 
     The communication unit  201  can transmit and receive signals to and from each processing unit  1  via a communication line, for example. For example, the communication unit  201  may be able to receive a signal from a management server for managing the substrate processing apparatus  100 . 
     The input unit  202  can input, for example, a signal corresponding to the operation of an operator or the like. The input unit  202  includes, for example, an operation unit such as a mouse and a keyboard capable of inputting a signal corresponding to an operation, a microphone capable of inputting a signal corresponding to a voice, various sensors capable of inputting a signal corresponding to a motion, and the like. 
     The output unit  203  can output, for example, various types of information in a mode that can be recognized by the operator. The output unit  203  includes, for example, a display unit that visually outputs various types of information, a speaker that audibly outputs various types of information, and the like. The display unit may have a form of, for example, a touch panel integrated with at least a part of the input unit  202 . 
     The storage unit  204  can store, for example, a program Pg 1  and various types of information. The storage unit  204  includes, for example, a non-volatile storage medium such as a hard disk or a flash memory. To the storage unit  204 , for example, any of a configuration including one storage medium, a configuration integrally including two or more storage media, and a configuration including two or more storage media divided into two or more portions may be applied. 
     The processing unit  205  includes, for example, an arithmetic processing unit  205   a  that acts as a processor, a memory  205   b  that temporarily stores information, and the like. For example, an electronic circuit such as a central processing unit (CPU) is applied to the arithmetic processing unit  205   a , and for example, a random access memory (RAM) or the like is applied to the memory  205   b . The processing unit  205  can implement the function of the control unit  2 , for example, by reading and executing the program Pg 1  stored in the storage unit  204 . Therefore, the program Pg 1  can be executed by, for example, the arithmetic processing unit  205   a  of the control unit  2 . Furthermore, for example, the storage unit  204  including a storage medium storing the program Pg 1  can be read by a computer. In the control unit  2 , for example, the processing unit  205  performs arithmetic processing according to a procedure described in the program Pg 1 , thereby implementing various functional units that control the operation of each unit of the substrate processing apparatus  100 . That is, the function and operation of the substrate processing apparatus  100  can be implemented by executing the program Pg 1  by the control unit  2  included in the substrate processing apparatus  100 . Note that some or all of the functional units realized by the control unit  2  may be realized as hardware by, for example, a dedicated logic circuit or the like. 
     The drive  206  is, for example, a portion to and from which a portable storage medium Sm 1  can be attached and detached. The drive  206  can exchange data between the storage medium Sm 1  and the processing unit  205  in a state where the storage medium Sm 1  is attached, for example. In addition, the drive  206  may be able to read and store the program Pg 1  from the storage medium Sm 1  into the storage unit  204  in a state where the storage medium Sm 1  storing the program Pg 1  is attached to the drive  206 . Here, the storage medium Sm 1  storing the program Pg 1  can be read by a computer, for example. 
     The overall operation of the substrate processing apparatus  100  will be subsequently described with reference to  FIG. 1 . In the substrate processing apparatus  100 , the control unit  2  controls each unit included in the substrate processing apparatus  100  according to a recipe describing a conveyance procedure, processing conditions, and the like of the substrate W, thereby executing a series of operations described below. 
     When the carrier C storing the untreated substrate W is placed on the carrier stage  111 , the transfer robot IR takes out the untreated substrate W from the carrier C. Then, the transfer robot IR moves the hand  112  holding the untreated substrate W to the substrate delivery position P, and delivers the untreated substrate W to the conveyance robot CR at the substrate delivery position P. The conveyance robot CR that has received the untreated substrate W on the hand  121  carries the untreated substrate W into the processing unit  1  designated by the recipe. The delivery of the substrate W between the transfer robot IR and the conveyance robot CR may be directly performed between the hand  112  and the hand  121 , for example, or may be performed via a placement portion or the like provided at the substrate delivery position P. 
     In the processing unit  1  into which the substrate W is carried in, predetermined processing is executed on the substrate W. Details of the processing unit  1  will be described later. 
     When the processing on the substrate W is completed in the processing unit  1 , the conveyance robot CR takes out the treated substrate W from the processing unit  1 . Then, the conveyance robot CR moves the hand  121  holding the treated substrate W to the substrate delivery position P, and delivers the treated substrate W to the transfer robot IR at the substrate delivery position P. The transfer robot IR that has received the treated substrate W on the hand  112  stores the treated substrate W in the carrier C. 
     In the substrate processing apparatus  100 , the conveyance robot CR and the transfer robot IR repeatedly perform the above-described conveyance operation according to the recipe, and each processing unit  1  executes processing on the substrate W according to the recipe. As a result, the substrate W is successively treated. 
     &lt;1-2. Processing Unit&gt; 
       FIGS. 3 and 4  are side views each schematically illustrating a configuration example of the processing unit  1 . The processing unit  1  is, for example, a single wafer processing unit capable of executing a series of substrate processing of sequentially performing etching for removing a thin film exposed from a resist on a lower surface (also referred to as a back surface) Wb of a substrate W such as a semiconductor wafer by corrosion, cleaning of the substrate W, and drying of the substrate W. 
     The processing unit  1  includes, for example, a spin chuck  20  that holds and rotates the substrate W in a substantially horizontal posture. The spin chuck  20  includes, for example, a central shaft  21 , a rotation mechanism  22 , a spin base  23 , and a plurality of chuck pins  24 . The central shaft  21  is a rod-shaped member having a longitudinal direction along the vertical direction and a perfectly circular cross section. The rotation mechanism  22  is a portion (also referred to as a first drive unit) that generates a driving force such as a motor for rotating the central shaft  21 . The spin base  23  is a disk-shaped member in a substantially horizontal posture, and the substantially center of the lower surface of the spin base  23  is fixed to the upper end portion of the central shaft  21  with a fastening component such as a screw. The plurality of chuck pins  24  are, for example, erected near the peripheral edge portion on the upper surface side of the spin base  23 , and are portions (also referred to as substrate holding units) capable of holding the substrate W by gripping the peripheral edge portion of the substrate W. Specifically, for example, the plurality of chuck pins  24  can hold the substrate W having a lower surface Wb as the first surface and an upper surface Wu as the second surface opposite to the lower surface Wb in the horizontal posture. In other words, the substrate W is held by the spin chuck  20  with the upper surface Wu facing upward. For example, three or more chuck pins  24  may be provided in order to reliably hold the circular substrate W, and are arranged at equal angular intervals along the peripheral edge portion of the spin base  23 . Each of the chuck pins  24  has a portion (also referred to as a substrate support portion) that supports the peripheral edge portion of the substrate W from below, and a portion (also referred to as a substrate gripping portion) that presses the outer peripheral end surface of the substrate W supported by the substrate support portion to hold the substrate W. In addition, each of the chuck pins  24  is configured to be switchable between a pressed state in which the substrate gripping portion presses the outer peripheral end surface of the substrate W and a released state in which the substrate gripping portion is separated from the outer peripheral end surface of the substrate W. Here, when the conveyance robot CR delivers the substrate W to the spin base  23 , each of the chuck pins  24  is in the released state, and when the substrate processing is performed on the substrate W, each of the chuck pins  24  is in the pressed state. When each of the chuck pins  24  is in the pressed state, each of the chuck pins  24  grips the peripheral edge portion of the substrate W, and the substrate W is held in a substantially horizontal posture with a predetermined interval from the spin base  23 . Here, for example, when the central shaft  21  is rotated by the rotation mechanism  22  in response to an operation command from the control unit  2 , the spin base  23  fixed to the central shaft  21  rotates about a virtual axis (also referred to as a virtual axis) P 0  extending along the vertical direction. That is, the rotation mechanism  22  can rotate the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0 . As a result, for example, the substrate W held in a substantially horizontal posture by the plurality of chuck pins  24  can be rotated about the virtual axis P 0 . 
     In addition, the processing unit  1  includes, for example, a lower supply portion  25  at a substantially central portion of the upper surface of the spin base  23 .  FIG. 5  is an enlarged view illustrating an example of a cross section of the lower supply portion  25  and a portion in the vicinity thereof. The lower supply portion  25  includes, for example, a substantially columnar main body portion  25   b  centered on the virtual axis P 0 , and a substantially annular plate-shaped eaves portion  25   a  extending outward in the radial direction of the virtual axis P 0  from the upper end portion of the main body portion  25   b . The main body portion  25   b  is inserted into, for example, a substantially columnar through hole formed to penetrate the central portion of the spin base  23  in the vertical direction. For example, a first discharge portion  25   o  and a second discharge portion  26   o  are provided substantially at the central portion of the upper end surface of the main body portion  25   b . An opening (also referred to as a discharge port) or the like capable of discharging liquid can be applied to the first discharge portion  25   o  and the second discharge portion  26   o . A flow path (also referred to as a lower annular flow path)  27   p  through which a gas passes is formed between the side surface of the main body portion  25   b  and the inner peripheral surface of the through hole of the spin base  23 . An annular third discharge portion  27   o  capable of discharging the gas from the lower annular flow path  27   p  is formed between the upper surface  23   u  of the spin base  23  and the main body portion  25   b . The eaves portion  25   a  is spaced upward from the upper surface  23   u  of the spin base  23  and is positioned so as to extend outward in the radial direction of the virtual axis P 0  along the upper surface  23   u . The lower surface of the eaves portion  25   a  is substantially parallel to the upper surface  23   u.    
     In addition, the processing unit  1  includes, for example, a blocking member  40  disposed above the spin chuck  20 . The blocking member  40  is, for example, a disk-shaped member. The lower surface of the blocking member  40  is a surface (also referred to as a substrate facing surface) facing substantially parallel to the upper surface Wu of the substrate W, and has a size equal to or larger than the diameter of the substrate W. The blocking member  40  is attached substantially horizontally to the lower end portion of a support shaft  42  having a substantially cylindrical shape, for example. The support shaft  42  is held rotatably about a vertical axis passing through the center of the substrate W via a rotation mechanism  44  and a lifting mechanism  45  by an arm  43  extending in the horizontal direction, for example. The rotation mechanism  44  can rotate the support shaft  42  about a vertical axis passing through the center of the substrate W in response to an operation command from the control unit  2 , for example. In addition, for example, the control unit  2  can control the operation of the rotation mechanism  44  to rotate the blocking member  40  in the same rotation direction and at substantially the same rotation speed as the substrate W corresponding to the rotation of the substrate W held by the spin chuck  20 . For example, the lifting mechanism  45  can dispose the blocking member  40  at a position close to the spin base or a position separated from the spin base  23  in response to an operation command from the control unit  2 . For example, by controlling the operation of the lifting mechanism  45 , the control unit  2  can raise the blocking member  40  to the separated position above the spin chuck  20  (position shown in  FIG. 3 ) when carrying the substrate W into and from the processing unit  1 , and can lower the blocking member  40  to the proximity position (position shown in  FIG. 4 ) in the immediate vicinity of the upper surface Wu of the substrate W held by the spin chuck  20  when predetermined substrate processing is performed on the substrate W in the processing unit  1 . Here, the blocking member  40  functions as a portion (also referred to as a protective portion) capable of covering the upper surface Wu of the substrate W held by the spin chuck  20  by being lowered to the proximity position. 
       FIG. 6  is a schematic block diagram illustrating an example of a gas-liquid supply portion  70  included in the processing unit  1 . The gas-liquid supply portion  70  includes, for example, the lower supply portion  25  provided in a substantially central portion of the spin base  23 . The lower supply portion  25  includes the first discharge portion  25   o , the second discharge portion  26   o , and the third discharge portion  27   o . The gas-liquid supply portion  70  includes, for example, an upper supply portion  46  provided in a substantially central portion of the lower surface of the blocking member  40 . The upper supply portion  46  includes, for example, a fourth discharge portion  72   o . The upper supply portion  46  may include, for example, a fifth discharge portion  73   o.    
     The lower supply portion  25  is connected to, for example, the chemical liquid supply source  71 , the pure water supply source  72 , and the IPA supply source  73  via each valve. Here, for example, by selectively opening and closing each valve in response to an operation command from the control unit  2 , it is possible to selectively supply the chemical liquid, pure water, or IPA from the chemical liquid supply source  71 , the pure water supply source  72 , and the IPA supply source  73  toward the lower supply portion  25 . Then, for example, the chemical liquid supplied from the chemical liquid supply source  71  to the lower supply portion  25  passes through a flow path penetrating the lower supply portion  25 , and is discharged from the first discharge portion  25   o  provided in the upper portion of the lower supply portion  25  toward the lower surface Wb of the substrate W. In other words, the first discharge portion  25   o  as the chemical liquid discharge portion can discharge the chemical liquid toward the lower surface Wb as the first surface of the substrate W held by the plurality of chuck pins  24  as the substrate holding unit. Therefore, in response to the operation signal from the control unit  2 , while rotating the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0  by the rotation mechanism  22 , it is possible to perform processing (also referred to as chemical liquid treatment) of discharging the chemical liquid toward the lower surface Wb of the substrate W held by the plurality of chuck pins  24  by the first discharge portion  25   o  and performing processing on the lower surface Wb. In addition, the liquid for cleaning (also referred to as a cleaning liquid) such as pure water or IPA supplied from the pure water supply source  72  or the IPA supply source  73  to the lower supply portion  25  passes through a flow path penetrating the lower supply portion  25 , and is discharged from the second discharge portion  26   o  as a cleaning liquid discharge portion provided in the upper portion of the lower supply portion  25  toward the lower surface Wb of the substrate W held by the spin chuck  20 . Therefore, for example, in response to the operation signal from the control unit  2 , while rotating the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0  by the rotation mechanism  22 , it is possible to perform processing (also referred to as a cleaning treatment) of cleaning the lower surface Wb by discharging the cleaning liquid such as pure water or IPA toward the lower surface Wb of the substrate W held by the plurality of chuck pins  24  by the second discharge portion  26   o.    
     The lower annular flow path  27   p  of the lower supply portion  25  is connected to the gas supply source  74  via, for example, a valve. Here, for example, by opening and closing the valve in response to an operation command from the control unit  2 , it is possible to supply gas (inert gas such as nitrogen gas, for example) from the gas supply source  74  toward the lower annular flow path  27   p . Then, the gas supplied from the gas supply source  74  to the lower annular flow path  27   p  is discharged from the annular third discharge portion  27   o  as a gas discharge portion toward the lower surface Wb of the substrate W held by the spin chuck  20 . Therefore, for example, in response to the operation signal from the control unit  2 , while rotating the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0  by the rotation mechanism  22 , it is possible to perform processing (also referred to as a drying treatment) of drying the lower surface Wb by discharging the gas toward the lower surface Wb of the substrate W held by the plurality of chuck pins  24  by the third discharge portion  27   o.    
     The upper supply portion  46  is connected to the gas supply source  74  via, for example, a valve. Here, by opening and closing the valve in response to an operation command from the control unit  2 , it is possible to supply gas (inert gas such as nitrogen gas, for example) from the gas supply source  74  toward the upper supply portion  46 . Then, the gas supplied from the gas supply source  74  to the upper supply portion  46  is discharged from the fourth discharge portion  72   o  toward the upper surface Wu of the substrate W. Therefore, for example, in response to an operation signal from the control unit  2 , in a state in which the blocking member  40  is disposed at a proximity position in the immediate vicinity of the upper surface Wu of the substrate W held by the spin chuck  20  (also referred to as a proximity state), while rotating the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0  by the rotation mechanism  22 , it is possible to perform processing of maintaining a state in which the upper surface Wu is dried (also referred to as a dry state) or a drying treatment of drying the upper surface Wu by discharging gas toward the upper surface Wu of the substrate W held by the plurality of chuck pins  24  by the fourth discharge portion  72   o . At this time, for example, the gas discharged from the fourth discharge part  72   o  in the gap between the blocking member  40  and the upper surface Wu of the substrate W flows toward the peripheral edge of the substrate W. 
     In addition, the upper supply portion  46  may be connected to the pure water supply source  72  and the IPA supply source  73  via each valve, for example. In this case, for example, by selectively opening and closing each valve in response to an operation command from the control unit  2 , it is possible to selectively supply pure water or IPA from the pure water supply source  72  and the IPA supply source  73  toward the upper supply portion  46 . Then, the pure water or IPA supplied from the pure water supply source  72  or the IPA supply source  73  to the upper supply portion  46  passes through a flow path penetrating the upper supply portion  46 , and is discharged from the fifth discharge portion  73   o  provided below the upper supply portion  46  toward the upper surface Wu of the substrate W. Therefore, for example, in response to an operation signal from the control unit  2 , in a proximity state in which the blocking member  40  is disposed at a proximity position in the immediate vicinity of the upper surface Wu of the substrate W held by the spin chuck  20 , while rotating the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0  by the rotation mechanism  22 , it is possible to execute a cleaning treatment of cleaning the upper surface Wu by discharging a cleaning liquid such as pure water or IPA toward the upper surface Wu of the substrate W held by the plurality of chuck pins  24  by the fifth discharge portion  73   o.    
     In addition, the processing unit  1  includes, for example, a cup unit  30  disposed to surround the periphery of the spin chuck  20 . The cup unit  30  includes, for example, a plurality of cup members that can be moved up and down independently of each other by a lifting drive unit  34 . Specifically, the cup unit  30  includes, for example, an inner cup member  31   a , a middle cup member  31   b , and an outer cup member  31   c . For example, various mechanisms such as a ball screw mechanism or an air cylinder can be applied to the lifting drive unit  34 . As a result, the lifting drive unit  34 , for example, functions as a portion (also referred to as a second drive unit) capable of changing the relative position in the vertical direction of each of the inner cup member  31   a , the middle cup member  31   b , and the outer cup member  31   c  with respect to the spin chuck  20  in response to an operation command from the control unit  2 . 
     For example, the inner cup member  31   a  surrounds the periphery of the spin chuck  20  and has a shape that is substantially rotationally symmetric with respect to the virtual axis P 0  passing through the center of the substrate W held by the spin chuck  20 . The inner cup member  31   a  includes, for example, a side wall portion having a cylindrical shape centered on the virtual axis P 0 , and an upper inclined portion having an annular shape centered on the virtual axis P 0  and extending obliquely upward from an upper end portion of the side wall portion so as to approach the virtual axis P 0 . In addition, for example, the middle cup member  31   b  further surrounds the outer peripheral portion of the inner cup member  31   a  positioned so as to surround the periphery of the spin chuck  20 , and has a shape that is substantially rotationally symmetric with respect to the virtual axis P 0  passing through the center of the substrate W held by the spin chuck  20 . The middle cup member  31   b  includes, for example, a side wall portion having a cylindrical shape centered on the virtual axis P 0  and an upper inclined portion having an annular shape centered on the virtual axis P 0  and extending obliquely upward from an upper end portion of the side wall portion so as to approach the virtual axis P 0 . In addition, for example, the outer cup member  31   c  further surrounds the outer peripheral portions of the inner cup member  31   a  and the middle cup member  31   b  positioned so as to sequentially surround the periphery of the spin chuck  20 , and has a shape that is substantially rotationally symmetric with respect to the virtual axis P 0  passing through the center of the substrate W held by the spin chuck  20 . The outer cup member  31   c  includes, for example, a side wall portion having a cylindrical shape centered on the virtual axis P 0 , and an upper inclined portion having an annular shape centered on the virtual axis P 0  and extending obliquely upward from an upper end portion of the side wall portion so as to approach the virtual axis P 0 . 
     Here, for example, when the inner cup member  31   a  is positioned so as to surround the spin base  23  and the plurality of chuck pins  24  from the side, the liquid discharged toward the substrate W held and rotated by the spin chuck  20  scatters toward the inner cup member  31   a  and is received by a wall surface (also referred to as an inner wall surface) Iwa of the inner cup member  31   a  on the virtual axis P 0  side. The liquid received by the inner cup member  31   a  flows down along the inner wall surface Iwa of the inner cup member  31   a , for example, and is collected through a first drainage tank  32   a  and a first drainage port  33   a . Further, for example, when the inner cup member  31   a  is lowered to the lowermost portion and the middle cup member  31   b  is positioned so as to surround the spin base  23  and the plurality of chuck pins  24  from the side, the liquid discharged toward the substrate W held and rotated by the spin chuck  20  scatters toward the middle cup member  31   b  and is received by a wall surface (also referred to as an inner wall surface) Iwb of the middle cup member  31   b  on the virtual axis P 0  side. The liquid received by the middle cup member  31   b  flows down along the inner wall surface Iwb of the middle cup member  31   b , for example, and is collected through a second drainage tank  32   b  and a second drainage port  33   b . Further, for example, when each of the inner cup member  31   a  and the middle cup member  31   b  is lowered to the lowermost portion and the outer cup member  31   c  is positioned so as to surround the spin base  23  and the plurality of chuck pins  24  from the side, the liquid discharged toward the substrate W held and rotated by the spin chuck  20  scatters toward the outer cup member  31   c  and is received by a wall surface (also referred to as an inner wall surface) Iwc of the outer cup member  31   c  on the virtual axis P 0  side. The liquid received by the outer cup member  31   c  flows down along the inner wall surface Iwc of the outer cup member  31   c , for example, and is collected through a third drainage tank  32   c  and a third drainage port  33   c.    
     The processing unit  1  also includes, for example, a fan filter unit (FFU)  50 . The FFU  50  can further clean an air in a clean room where the substrate processing apparatus  100  is installed and supply the air to a space in the processing chamber  140 . The FFU  50  is attached to, for example, a ceiling wall of the processing chamber  140 . The FFU  50  is equipped with fans and filters (e.g., HEPA filters) for taking in air within the clean room and feeding the air into the processing chamber  140  and can form a clean air downflow in the processing space within the processing chamber  140 . In order to uniformly disperse the clean air supplied from the FFU  50  in the processing chamber  140 , a punching plate provided with a large number of blow-out holes may be disposed immediately below the ceiling wall. In addition, in a part of the side wall of the processing chamber  140  and in the vicinity of the floor wall of the processing chamber, for example, an exhaust duct  60  connected to communicate with the exhaust mechanism is provided. As a result, for example, of the clean air supplied from the FFU  50  and flowing down in the processing chamber  140 , the air passing through the vicinity of the cup unit  30  and the like can be discharged to the outside of the apparatus through the exhaust duct  60 . 
     &lt;1-3. Processing Using Processing Unit&gt; 
       FIG. 7  is a diagram illustrating an example of a flow of processing using the processing unit  1 . The flow of the processing is realized by controlling the operation of each unit by the control unit  2 . At this time, the program Pg 1  can be executed by, for example, a processor included in the processing unit  205  of the control unit  2 . Here, description will be given focusing on one processing unit  1  of the substrate processing apparatus  100 . 
     In the substrate processing apparatus  100 , first, by the conveyance robot CR, an untreated substrate W is carried into the processing unit  1  via the carry-in/out port  15  of the processing chamber  140  (step SU). At this time, the untreated substrate W is held in a substantially horizontal posture by the plurality of chuck pins  24 . Here, it is assumed that the untreated substrate W is in a state in which at least a part of the thin film is exposed on the upper surface Wu and a part of the thin film is exposed from the resist on the lower surface Wb. As the material of the thin film, for example, a material having conductivity such as copper is applied. 
     Next, chemical liquid treatment is executed on the lower surface Wb of the substrate W in the processing unit  1  (step St 2 ). Here, first, the blocking member  40  is lowered to a proximity position in the immediate vicinity of the upper surface Wu of the substrate W held by the spin chuck  20 . Thereafter, a step (also referred to as a first step) is performed in which the control unit  2 , while causing the rotation mechanism  22  to rotate the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0 , causes the first discharge portion  25   o  to discharge a chemical liquid toward the lower surface Wb of the substrate W held by the plurality of chuck pins  24  to execute a chemical liquid treatment of treating the lower surface Wb. At this time, for example, in order to maintain the upper surface Wu in a dry state, the fourth discharge portion  72   o  discharges an inert gas such as nitrogen gas toward the upper surface Wu of the substrate W. In addition, the control unit  2  causes the lifting drive unit  34  to execute a step (also referred to as a second step) of changing the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  during execution of chemical liquid treatment in the first step. As a result, for example, when the chemical liquid treatment is applied to the substrate W, a region of the inner wall surface of the cup unit  30  that receives droplets of the chemical liquid scattered from the rotating substrate W moves in the vertical direction. Therefore, for example, the droplets of the chemical liquid scattered from the rotating substrate W is less likely to collide with the droplets adhering to the inner wall surface of the cup unit  30 . As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface of the cup unit  30  is less likely to occur, and the minute droplets of the chemical liquid are less likely to reach the upper surface Wu of the substrate W. Therefore, for example, contamination of the upper surface Wu of the substrate W and a defect in which an unintended treatment is applied to the upper surface Wu of the substrate W hardly occur, and the quality of the substrate W can be improved. A specific operation example at the time of executing the chemical liquid treatment will be described later. 
     After the chemical liquid treatment is executed, the processing unit  1  executes a cleaning treatment on the lower surface Wb of the substrate W (step St 3 ). Here, for example, the control unit  2 , while causing the rotation mechanism  22  to rotate the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0 , causes the second discharge portion  26   o  to discharge a cleaning liquid (pure water or the like) toward the lower surface Wb of the substrate W held by the plurality of chuck pins  24 , thereby executing a cleaning treatment of cleaning the lower surface Wb. As a result, the chemical liquid, particles, and the like adhering to the lower surface Wb of the substrate W are removed. Here, for example, the control unit  2 , while executing the cleaning treatment, may cause the lifting drive unit  34  to change the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20 . In this case, for example, in a wide range of the inner wall surface of the cup unit  30 , droplets of the cleaning liquid scattered from the rotating substrate W are received. Therefore, the chemical liquid adhering to the inner wall surface of the cup unit  30  by the chemical liquid treatment can be washed away with the cleaning liquid. As a result, for example, it is possible to reduce the amount of the chemical liquid adhering to the inner wall surface of the cup unit  30  until the chemical liquid treatment is executed on the next substrate W. As a result, for example, during execution of the chemical liquid treatment on the next substrate W, when the inner wall surface of the cup unit  30  receives the droplets of the chemical liquid scattered from the rotating next substrate W, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface of the cup unit  30  is less likely to occur, and the quality of the substrate W can be improved. Note that, for example, in parallel with the cleaning treatment on the lower surface Wb of the substrate W, the cleaning treatment may be performed on the upper surface Wu of the substrate W by discharging the cleaning liquid from the fifth discharge portion  73   o  toward the upper surface Wu of the substrate W. A specific operation example at the time of executing the cleaning treatment will be described later. 
     After the above cleaning treatment, a drying treatment is executed on the lower surface Wb of the substrate W in the processing unit  1  (step St 4 ). Here, for example, the control unit  2 , while causing the rotation mechanism  22  to rotate the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0 , causes the third discharge portion  27   o  to discharge gas toward the lower surface Wb of the substrate W held by the plurality of chuck pins  24 , thereby executing a drying treatment of drying the lower surface Wb. As a result, the treatment liquid or the like adhering to the lower surface Wb of the substrate W is removed, and the lower surface Wb of the substrate W is dried. Here, for example, the control unit  2 , while executing the drying treatment, may cause the lifting drive unit  34  to change the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20 . In this case, for example, in a wide range of the inner wall surface of the cup unit  30 , gas flowing along the lower surface Wb of the rotating substrate W is blown. At this time, for example, the gas flowing along the path drawn by the two-dot chain line arrow Dp 0  is blown onto the inner wall surface of the cup unit  30 . Therefore, for example, the inner wall surface of the cup unit  30  can be dried over a wide range. As a result, for example, when chemical liquid treatment is executed on the next substrate W, droplets of the chemical liquid scattered from the rotating substrate W can be received by the more dried inner wall surface of the cup unit  30 . As a result, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface of the cup unit  30  is less likely to occur, and the quality of the substrate W can be improved. Note that, for example, in parallel with the drying treatment on the lower surface Wb of the substrate W, the drying treatment may be performed on the upper surface Wu of the substrate W by discharging the gas from the fourth discharge portion  72   o  toward the upper surface Wu of the substrate W. A specific operation example at the time of executing the drying treatment will be described later. 
     Next, the conveyance robot CR carries the treated substrate W out of the processing unit  1  through the carry-in/out port  15  of the processing chamber  140  (step St 5 ). 
     Then, the control unit  2 , for example, with reference to a recipe or the like, determines whether or not a next substrate W to be processed in the processing unit  1  is present (step St 6 ). Here, if an untreated substrate W as a next processing target in the processing unit  1  is present, the process returns to step St 1 , and if no untreated substrate W as a next treatment target in the processing unit  1  is present, a series of processing using the processing unit  1  is terminated. 
     &lt;1-3-1. Specific Operation Example at the Time of Executing Chemical Liquid Treatment&gt; 
       FIGS. 8( a ) and 8( b )  are views schematically illustrating a change in the position in the vertical direction of the cup unit  30  at the time of executing the substrate processing. In the examples of  FIGS. 8( a ) and 8( b ) , in a state where the inner cup member  31   a  is lowered to the lowermost portion, the middle cup member  31   b  and the outer cup member  31   c  are moved between a raised predetermined first position H 0  and a lowered predetermined second position L 0 .  FIG. 8( a )  illustrates a state in which the middle cup member  31   b  and the outer cup member  31   c  are raised to a predetermined first position H 0 , and  FIG. 8( b )  illustrates a state in which the middle cup member  31   b  and the outer cup member  31   c  are lowered to a predetermined second position L 0 . In addition, in  FIGS. 8( a ) and 8( b ) , a path in which a droplet of a chemical liquid or the like discharged toward the lower surface Wb of the substrate W is scattered toward the cup unit  30  by the rotation of the substrate W about the virtual axis P 0  by the spin chuck  20  is drawn by an arrow Dp 0  of a two-dot chain line. Specifically, a state in which a droplet of a chemical liquid or the like discharged toward the lower surface Wb of the substrate W is scattered toward a region (also referred to as a liquid receiving region) Ar 1  of the inner wall surface Iwb of the middle cup member  31   b  is illustrated. Further, in  FIG. 8( a ) , an example of a downflow path of clean air from the FFU  50  toward the inside (specifically, the inner wall surface Iwb of the middle cup member  31   b ) to the cup unit  30  is drawn by a two-dot chain line arrow Af 0 . 
       FIGS. 9( a ) to 9( c )  are timing charts illustrating a change in the position in the vertical direction of the cup unit  30  at the time of executing the chemical liquid treatment. Each of  FIGS. 9( a ) to 9( c )  illustrates a change over time in the opening and closing of a valve (also referred to as a valve for a chemical liquid) for supplying a chemical liquid from the chemical liquid supply source  71  to the lower supply portion  25 , and in the position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ). 
     Here, for example, as illustrated in  FIG. 9( a ) , in a period (also referred to as a chemical liquid treatment period) PD 1  from a first timing at which the valve for the chemical liquid is opened to start execution of the chemical liquid treatment to a second timing at which the valve for the chemical liquid is closed to end the execution of the chemical liquid treatment, an aspect is conceivable in which the control unit  2  performs control so as to cause the lifting drive unit  34  to move the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  downward and not to move the relative position upward. When such an aspect is adopted, in the examples of  FIGS. 8( a ) and 8( b ) , the liquid receiving region Ar 1  on the inner wall surface Iwb moves upward with the lapse of time. Therefore, for example, when the inner wall surface Iwb is in a dry state before the start of the chemical liquid treatment, the droplets of the chemical liquid scattered from the rotating substrate W hardly collide with the droplets adhering to the inner wall surface Iwb. As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface Iwb is less likely to occur, and the minute droplets of the chemical liquid are less likely to reach the upper surface Wu of the substrate W. As a result, for example, contamination of the upper surface Wu of the substrate W and a defect in which an unintended treatment is applied to the upper surface Wu of the substrate W hardly occur, and the quality of the substrate W can be improved. 
     Here, for example, the control unit  2 , in the chemical liquid treatment period PD 1 , in order to scatter the droplets of the chemical liquid from the substrate W toward the dried portion of the inner wall surface Iwb, may control the speed at which the lifting drive unit  34  moves the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the downward direction. The speed of such movement may be obtained in advance by, for example, an experiment using an apparatus having a configuration equivalent to that of the processing unit  1 , or may be obtained in advance by a simulation according to the configuration of the processing unit  1 . When such a configuration is adopted, for example, in a dry region of the inner wall surface Iwb, even if droplets of the chemical liquid scattered from the rotating substrate W are received, a splash in which a large amount of minute droplets splash from the inner wall surface Iwb is less likely to occur, and the quality of the substrate W can be improved. 
     In addition, here, for example, if the control unit  2 , when executing the chemical liquid treatment, causes the blocking member  40  to cover the upper surface Wu without causing the upper supply portion  46  to discharge liquid onto the upper surface Wu, a problem that minute droplets of the chemical liquid adhere to the upper surface Wu to be maintained in a dry state and the quality of the upper surface Wu deteriorates is unlikely to occur. Here, for example, an aspect is conceivable in which the control unit  2  causes the blocking member  40  to cover the upper surface Wu without causing the fifth discharge portion  73   o  to discharge the cleaning liquid such as pure water or IPA to the upper surface Wu. Then, at this time, for example, even if a large droplet of the chemical liquid bounces off the inner wall surface Iwb, in order to prevent the large droplet of the chemical liquid from reaching the upper surface Wu of the substrate W, the upper surface Wu can be protected by the presence of the blocking member  40  and the flow of the inert gas from the fourth discharge portion  72   o  in the gap between the blocking member  40  and the upper surface Wu of the substrate W. As a result, for example, contamination of the upper surface Wu of the substrate W and a defect in which an unintended treatment is applied to the upper surface Wu of the substrate W hardly occur, and the quality of the substrate W can be improved. 
     In addition, here, as in the example of  FIG. 9( a ) , after the second timing at which the chemical liquid treatment period PD 1  ends, the control unit  2  may perform control to stop the downward movement of the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  by the lifting drive unit  34 . As described above, for example, after the scattering of the droplets of the chemical liquid from the rotating substrate W is completed, if the downward movement of the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  is stopped, the droplets of the chemical liquid scattered from the rotating substrate W is less likely to collide with the droplets adhering to the inner wall surface Iwb. As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface Iwb is less likely to occur, and the quality of the substrate W can be improved. 
     In addition, here, as in the example of  FIG. 9( a ) , before the first timing at which the chemical liquid treatment period PD 1  is started, the control unit  2  may perform control to start the downward movement of the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  by the lifting drive unit  34 . According to such control, for example, droplets of the chemical liquid scattered from the rotating substrate W are less likely to continuously collide with the same portion of the inner wall surface (specifically, the inner wall surface Iwb of the middle cup member  31   b ) of the cup unit  30 . As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface Iwb is less likely to occur, and the quality of the substrate W can be improved. 
     By the way, for example, in a case where the chemical liquid treatment period PD 1  is a relatively long time such as several 10 seconds or more, as shown in  FIG. 9( b ) , the control unit  2 , during the execution of the chemical liquid treatment, may cause the lifting drive unit  34  to alternately perform an operation (also referred to as a first operation) of moving the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the downward direction and an operation (also referred to as a second operation) of moving the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the upward direction. According to such an operation, for example, during the execution of the chemical liquid treatment, it is possible to change the liquid receiving region Ar 1  that receives the droplets of the chemical liquid scattered from the rotating substrate W on the inner wall surface Iwb. At this time, for example, as compared with a case where the liquid receiving region Ar 1  on the inner wall surface Iwb does not change, the droplets of the chemical liquid scattered from the rotating substrate W are less likely to collide with the droplets adhering to the inner wall surface Iwb. Further, for example, when the second operation is performed, even if droplets of the chemical liquid scattered from the rotating substrate W collide with the film-like chemical liquid flowing down on the inner wall surface Iwb, a splash in which a large amount of minute droplets of the chemical liquid splash is less likely to occur. 
     In addition, at this time, for example, if the liquid receiving region Ar 1  on the inner wall surface Iwb is lowered by the second operation, a wide region above the liquid receiving region Ar 1  in the inner wall surface Iwb can be dried by the downflow of the clean air whose path is drawn by the arrow Af 0  or the like. Therefore, in the next first operation, in a relatively dry region of the inner wall surface Iwb, droplets of the chemical liquid scattered from the rotating substrate W are easily received. As a result, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface Iwb is less likely to occur. Further, at this time, for example, when the middle cup member  31   b  moves toward the predetermined first position H 0  by the second operation, as illustrated in  FIG. 8( a ) , the downflow of the clean air whose path is drawn by the arrow Af 0  easily flows toward the inner wall surface Iwb. For this reason, for example, even if a splash in which a large amount of minute droplets of the chemical liquid splash on the inner wall surface Iwb occurs, the minute droplets are less likely to fly up due to the downflow of the clean air whose path is drawn by the arrow Af 0 . Furthermore, for example, even if a splash in which a large amount of minute droplets of the chemical liquid splash on the inner wall surface Iwb occurs, the downflow of the clean air in the processing chamber  140  generates a flow toward the outer peripheral direction of the blocking member  40  on the upper surface side of the blocking member  40  so that the minute droplets of the chemical liquid are less likely to reach the upper surface Wu of the substrate W. As a result, contamination of the upper surface Wu of the substrate W and a defect in which an unintended treatment is applied to the upper surface Wu of the substrate W hardly occur. 
     Here, as in the example of  FIG. 9( b ) , if the control unit  2 , before stopping the execution of the first operation and the second operation by the lifting drive unit  34 , causes the first discharge portion  25   o  to stop the discharge of the chemical liquid toward the lower surface Wb of the substrate W held by the spin chuck  20 , droplets of the chemical liquid scattered from the rotating substrate W are less likely to continuously collide with the same portion of the inner wall surface Iwb. As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface Iwb is less likely to occur, and the quality of the substrate W can be improved. Further, here, as in the example of  FIG. 9( b ) , if the control unit  2 , after starting the execution of the first operation and the second operation by the lifting drive unit  34 , causes the first discharge portion  25   o  to start the discharge of the chemical liquid toward the lower surface Wb of the substrate W held by the spin chuck  20 , droplets of the chemical liquid scattered from the rotating substrate W are less likely to continuously collide with the same portion of the inner wall surface Iwb. As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface Iwb is less likely to occur, and the quality of the substrate W can be improved. 
     In addition, for example, if the control unit  2  causes the lifting drive unit  34  to quickly execute switching between the first operation and the second operation, the time during which droplets of the chemical liquid scattered from the rotating substrate W continuously collide with the same portion of the inner wall surface Iwb is shortened. As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface Iwb is less likely to occur, and the quality of the substrate W can be improved. 
     Furthermore, here, for example, as in the example of  FIG. 9( c ) , when the control unit  2 , during the execution of the chemical liquid treatment, causes the lifting drive unit  34  to execute the second operation, the control unit  2  may stop the discharge of the chemical liquid toward the lower surface Wb of the substrate W held by the spin chuck  20  by the first discharge portion  25   o . When such a configuration is adopted, for example, the droplets of the chemical liquid scattered from the rotating substrate W hardly collide with the droplets adhering to the inner wall surface Iwb. As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface Iwb is less likely to occur, and the quality of the substrate W can be improved. 
     &lt;1-3-2. Specific Operation Example when Cleaning Treatment is Executed&gt; 
       FIGS. 10( a ) and 10( b )  are timing charts illustrating a change in the position in the vertical direction of the cup unit  30  at the time of executing the cleaning treatment. Each of  FIGS. 10( a ) and 10( b )  shows a change over time in the opening and closing of a valve (also referred to as a valve for pure water) for supplying pure water from the pure water supply source  72  to the lower supply portion  25 , and in the position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ). 
     Here, for example, as shown in  FIG. 10( a ) , in a period (also referred to as a cleaning treatment period) PD 2  from a timing at which the valve for pure water is opened to start the execution of the cleaning treatment to a timing at which the valve for pure water is closed to end the execution of the cleaning treatment, an aspect is conceivable in which the control unit  2  performs control to cause the lifting drive unit  34  to move the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the upward direction. Here, as in the example of  FIG. 10( a ) , the control unit  2 , after starting the execution of the cleaning treatment, may start the movement of the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  by the lifting drive unit  34 . In addition, the control unit  2 , before ending the execution of the cleaning treatment, may end the movement of the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  by the lifting drive unit  34 . As a result, for example, in the chemical liquid adhering to the inner wall surface of the cup unit  30  by the chemical liquid treatment, a portion not washed out by the cleaning liquid is less likely to be generated. As a result, it is possible to reduce the amount of the chemical liquid adhering to the inner wall surface of the cup unit  30  until the chemical liquid treatment is executed on the next substrate W. 
     In addition, as shown in  FIG. 10( b ) , the control unit  2 , during the execution of the cleaning treatment, may cause the lifting drive unit  34  to alternately execute the first operation of moving the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the downward direction and the second operation of moving the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the upward direction. 
     &lt;1-3-3. Specific Operation Example when Drying Treatment is Executed&gt; 
       FIGS. 11( a ) and 11( b )  are timing charts illustrating a change in the position in the vertical direction of the cup unit  30  at the time of executing the drying treatment. Each of  FIGS. 11( a ) and 11( b )  illustrates a change over time in the opening and closing of a valve (also referred to as a valve for gas) for supplying gas from the gas supply source  74  to the lower annular flow path  27   p  and the position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ). 
     Here, for example, as illustrated in  FIG. 11( a ) , in a period (also referred to as a drying treatment period) PD 3  from the timing of opening the valve for gas to start the execution of the drying treatment to the timing of closing the valve for gas to end the execution of the drying treatment, an aspect is conceivable in which the control unit  2  performs control to cause the lifting drive unit  34  to move the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the upward direction. Here, as in the example of FIG.  11 ( a ), the control unit  2 , after starting the execution of the drying treatment, may start the movement of the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  by the lifting drive unit  34 . In addition, the control unit  2 , before ending the execution of the drying treatment, may end the movement of the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  by the lifting drive unit  34 . As a result, for example, since unevenness is less likely to occur in the drying of the liquid adhering to the inner wall surface of the cup unit  30  due to the cleaning treatment or the like, the inner wall surface of the cup unit  30  can be further dried before the chemical liquid treatment on the next substrate W is executed. 
     In addition, as shown in  FIG. 11( b ) , the control unit  2 , during the execution of the drying treatment, may cause the lifting drive unit  34  to alternately execute the first operation of moving the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the downward direction and the second operation of moving the relative position in the vertical direction of the cup unit  30  (specifically, the middle cup member  31   b ) with respect to the spin chuck  20  in the upward direction. 
     &lt;1-4. Summary&gt; 
     As described above, in the substrate processing apparatus  100  according to the first embodiment, for example, the control unit  2 , while causing the rotation mechanism  22  to rotate the spin base  23  and the plurality of chuck pins  24  about the virtual axis P 0  and causing the first discharge portion  25   o  to discharge the chemical liquid toward the lower surface Wb of the substrate W held by the plurality of chuck pins  24  to execute the chemical liquid treatment of treating the lower surface Wb, causes the lifting drive unit  34  to change the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20 . In other words, for example, when the treatment using the chemical liquid is performed on the substrate W, the liquid receiving region Ar 1  that receives the droplets of the chemical liquid scattered from the rotating substrate W on the inner wall surface of the cup unit  30  moves in the vertical direction. Thus, for example, the droplets of the chemical liquid scattered from the rotating substrate W are less likely to collide with the droplets adhering to the inner wall surface of the cup unit  30 . As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface of the cup unit  30  is less likely to occur, and the minute droplets of the chemical liquid are less likely to reach the upper surface Wu of the substrate W. Therefore, for example, contamination of the upper surface Wu of the substrate W and a defect in which an unintended treatment is applied to the upper surface Wu of the substrate W hardly occur, and the quality of the substrate W can be improved. 
     &lt;2. Modifications&gt; 
     The present invention is not limited to the above-described first embodiment, and various changes, improvements, and the like can be made without departing from the gist of the present invention. 
     In the first embodiment described above, for example, the control unit  2 , after the execution of the chemical liquid treatment on the first substrate W is completed in the processing unit  1 , may prohibit the start of the execution of the chemical liquid treatment on the second substrate W as the next treatment target of the first substrate W in the processing unit  1  until a preset time required for drying the cup unit  30  elapses. When such a configuration is adopted, for example, by sufficiently drying the cup unit  30 , during execution of the chemical liquid treatment on the substrate W as the next treatment target, when the inner wall surface of the cup unit  30  receives the droplets of the chemical liquid scattered from the rotating substrate W, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface of the cup unit  30  is less likely to occur. Therefore, for example, the quality of the substrate W can be improved. 
       FIG. 12  is a diagram illustrating an example of a flow of processing using the processing unit  1  according to the first modification. The flowchart of  FIG. 12  is based on the flowchart of  FIG. 7 , and if there is an untreated substrate W as a next treatment target in the processing unit  1  in step St 6 , the flowchart is changed to return to step St 2  through steps St 7 A and St 8 A instead of returning to step St 1 . Here, in step St 7 A, for example, similarly to step St 1 , the conveyance robot CR carries the untreated substrate W into the processing unit  1  via the carry-in/out port  15  of the processing chamber  140 . Next, the control unit  2  determines whether or not a predetermined time has elapsed from a reference timing until a predetermined time has elapsed from the reference timing (step St 8 A). Here, the determination in step St 8 A is repeated, and when a predetermined time has elapsed from the reference timing, the process returns to step St 2 . Here, the reference timing may be, for example, a timing at which the carry-in of the substrate W in step St 7 A is completed, or may be any timing of the operations in steps St 2  to St 6 . The predetermined time may be a preset time required for drying the cup unit  30 . This predetermined time may be obtained in advance by, for example, an experiment using an apparatus having a configuration equivalent to that of the processing unit  1 , or may be obtained in advance by a simulation according to the configuration of the processing unit  1 . The predetermined time can be set within several minutes, for example. When such a processing flow is adopted, the chemical liquid treatment on the substrate W as the next treatment target can be executed after the cup unit  30  is sufficiently dried. 
     In the first embodiment, for example, an example has been described in which droplets of the chemical liquid discharged toward the lower surface Wb of the substrate W are scattered toward the liquid receiving region Ar 1  of the inner wall surface Iwb of the middle cup member  31   b , but the present invention is not limited thereto. Any of the inner cup member  31   a  and the outer cup member  31   c  may play the role of the middle cup member  31   b  instead of the middle cup member  31   b.    
     In the first embodiment, for example, the cup unit  30  has a plurality of cup members that can be moved up and down independently of each other by the lifting drive unit  34 , but the present invention is not limited thereto. For example, the cup unit  30  may have one or more cup members.  FIGS. 13( a ) and 13( b )  are views schematically illustrating an example of movement of a cup unit  30 B in the processing unit  1  according to the second modification. The cup unit  30 B includes, for example, one cup member  31 B that can be moved up and down by the lifting drive unit  34  instead of including the three cup members  31   a ,  31   b , and  31   c  as in the cup unit  30  according to the first embodiment.  FIG. 13( a )  is a view in which the cup unit  30  in  FIG. 8( a )  is replaced with the cup unit  30 B.  FIG. 13( b )  is a view in which the cup unit  30  in  FIG. 8( b )  is replaced with the cup unit  30 B. That is,  FIGS. 13( a ) and 13( b )  illustrate an example in which the cup member  31 B is moved between a predetermined first position H 0  that is raised and a predetermined second position L 0  that is lowered. In this case, for example, the cup member  31 B and its inner wall surface IwB play the role of the middle cup member  31   b  and its inner wall surface Iwb in the first embodiment.  FIG. 13( a )  illustrates a state in which the cup member  31 B is raised to the predetermined first position H 0 , and  FIG. 13( b )  illustrates a state in which the cup member  31 B is lowered to the predetermined second position L 0 . 
     Here, for example, immediately before the chemical liquid treatment is started, while the substrate W is rotated about the virtual axis P 0  by the spin chuck  20 , pretreatment (also referred to as pre-pure water treatment) which causes the second discharge portion  26   o  to discharge pure water to the lower surface Wb of the substrate W to make the pure water adhere to the lower surface Wb may be performed. In this case, for example, before the start of the pre-pure water treatment or before the start of the chemical liquid treatment, the relative position in the vertical direction of the cup member  31 B with respect to the spin chuck  20  may be started to be moved in the downward direction by the lifting drive unit  34 . As a result, for example, in the initial stage of the chemical liquid treatment, the dried region of the inner wall surface IwB of the cup member  31 B, which is not wet by the pre-pure water treatment, can receive droplets of the chemical liquid scattered from the lower surface Wb of the rotating substrate W. As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface IwB of the cup unit  30 B is less likely to occur, and the minute droplets of the chemical liquid are less likely to reach the upper surface Wu of the substrate W. As a result, for example, contamination of the upper surface Wu of the substrate W and a defect in which an unintended treatment is applied to the upper surface Wu of the substrate W hardly occur, and the quality of the substrate W can be improved. 
       FIG. 14  is a timing chart illustrating a change in the position of the cup unit  30 B (specifically, the cup member  31 B) at the time of executing the pre-pure water treatment and the chemical liquid treatment according to the second modification.  FIG. 14  illustrates a change over time in each of opening and closing of a valve (also referred to as a valve for pure water) for supplying pure water from the pure water supply source  72  to the lower supply portion  25 , opening and closing of a valve (also referred to as a valve for chemical liquid) for supplying chemical liquid from the chemical liquid supply source  71  to the lower supply portion  25 , and a position in the vertical direction of the cup unit  30 B (specifically, the cup member  31 B).  FIG. 14  shows an example in which from before the start of the pre-pure water treatment to after the end of the chemical liquid treatment, the relative position in the vertical direction of the cup member  31 B with respect to the spin chuck  20  is moved in the downward direction by the lifting drive unit  34 . 
     In the first embodiment, for example, the first surface onto which the chemical liquid is discharged when the chemical liquid treatment is executed is the lower surface Wb of the substrate W. However, the present invention is not limited thereto, and the first surface may be the upper surface Wu of the substrate W. Here, for example, it may be possible to discharge the chemical liquid from the upper supply portion  46  provided in the blocking member  40  toward the upper surface Wu of the substrate W, or it may be possible to discharge the chemical liquid from a nozzle movable between a region between the blocking member  40  disposed at a position separated from the spin base  23  and the spin base  23  and a region retracted from above the spin base  23  toward the upper surface Wu of the substrate W. Note that, in this case, for the spin base  23 , for example, instead of the plurality of chuck pins  24 , another configuration capable of holding the substrate W such as a vacuum chuck capable of adsorbing the lower surface Wb of the substrate W may be adopted. 
       FIG. 15  is a schematic block diagram illustrating an example of a gas-liquid supply portion  70 C according to a third modification. The gas-liquid supply portion  70 C is based on the gas-liquid supply portion  70  according to the first embodiment, and the upper supply portion  46  is changed to an upper supply portion  46 C further including a sixth discharge portion  710  as a chemical liquid discharge portion capable of discharging a chemical liquid supplied from the chemical liquid supply source  71  via a valve toward the upper surface Wu of the substrate W. In the example of  FIG. 15 , by discharging the chemical liquid toward the upper surface Wu of the substrate W rotated about the virtual axis P 0  by the spin chuck  20  by the sixth discharge portion  71   o , it is possible to execute the chemical liquid treatment on the upper surface Wu of the substrate W. 
       FIG. 16  is a side view schematically illustrating a configuration example of a processing unit  1 C according to the third modification. In the example of  FIG. 16 , the processing unit  1 C is based on the processing unit  1  according to the first embodiment, and is added with a treatment liquid supply portion  60 C in which a nozzle portion  61 C as the chemical liquid discharge portion is movable between the region between the blocking member  40  and the spin base  23  and the region retracted from above the spin base  23  by the rotation of an arm  62 C in a state where the blocking member  40  is disposed at the position separated from the spin base  23 .  FIG. 16  illustrates a state in which the nozzle portion  61 C is positioned in a region between the blocking member  40  and the spin base  23 . In the example of  FIG. 16 , the nozzle portion  61 C, in a state of being positioned in the region between the blocking member  40  and the spin base  23 , can discharge the chemical liquid toward the upper surface Wu of the substrate W rotated about the virtual axis P 0  by the spin chuck  20 . 
     When the chemical liquid treatment is executed on the upper surface Wu, for example, a gas is discharged toward the lower surface Wb of the substrate W by the third discharge portion  27   o . Here, similarly to when the chemical liquid treatment is executed on the lower surface Wb in the first embodiment, if the position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  is changed by the lifting drive unit  34 , a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface of the cup unit  30  is less likely to occur, and the minute droplets of the chemical liquid are less likely to reach the lower surface Wb of the substrate W. As a result, for example, contamination of the lower surface Wb of the substrate W and a defect in which an unintended treatment is applied to the lower surface Wb of the substrate W hardly occur, and the quality of the substrate W can be improved. 
       FIGS. 17( a ) and 17( b )  are views schematically illustrating an example of a change in the position of the cup unit  30  during execution of the substrate treatment according to the third modification. In the examples of  FIGS. 17( a ) and 17( b ) , similarly to the examples of  FIGS. 8( a ) and 8( b ) , in a state where the inner cup member  31   a  is lowered to the lowermost portion, the middle cup member  31   b  and the outer cup member  31   c  are moved between the raised predetermined first position H 0  and the lowered predetermined second position L 0 .  FIG. 17( a )  illustrates a state in which the middle cup member  31   b  and the outer cup member  31   c  are raised to the predetermined first position H 0 , and  FIG. 17( b )  illustrates a state in which the middle cup member  31   b  and the outer cup member  31   c  are lowered to the predetermined second position L 0 . In addition, in  FIGS. 17( a ) and 17( b ) , a path in which the droplet of the chemical liquid discharged toward the upper surface Wu of the substrate W by the nozzle portion  61 C is scattered toward the cup unit  30  by the rotation of the substrate W about the virtual axis P 0  by the spin chuck  20  is drawn by an arrow Dp 0  of a two-dot chain line. Specifically, a state in which droplets of the chemical liquid discharged toward the upper surface Wu of the substrate W are scattered toward the liquid receiving region Ar 1  of the inner wall surface Iwb of the middle cup member  31   b  is illustrated. Further, in  FIG. 17( a ) , as in  FIG. 8( a ) , an example of a downflow path of the clean air from the FFU  50  toward the inside (specifically, the inner wall surface Iwb of the middle cup member  31   b ) to the cup unit  30  is drawn by an arrow Af 0  of a two-dot chain line. 
     Here, for example, in a period (chemical liquid treatment period) in which the control unit  2  executes the chemical liquid treatment of treating the upper surface Wu by discharging the chemical liquid toward the upper surface Wu of the substrate W by the nozzle portion  61 C, if the control unit  2  causes the lifting drive unit  34  to change the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20 , the liquid receiving region Ar 1  that receives the droplets of the chemical liquid scattered from the rotating substrate W on the inner wall surface of the cup unit  30  moves in the vertical direction. Thus, for example, the droplets of the chemical liquid scattered from the rotating substrate W are less likely to collide with the droplets adhering to the inner wall surface (the inner wall surface Iwb of the middle cup member  31   b  in the example of  FIG. 17 ) of the cup unit  30 . As a result, for example, a splash in which a large amount of minute droplets of the chemical liquid splash from the inner wall surface of the cup unit  30  is less likely to occur. Therefore, for example, the minute droplets of the chemical liquid are less likely to reach the lower surface Wb of the substrate W that is not the target of the chemical liquid treatment, and the minute droplets of the chemical liquid are less likely to reach the upper surface Wu of the substrate W that is the target of the chemical liquid treatment. As a result, for example, contamination of the lower surface Wb of the substrate W and a defect in which unintended treatment is applied to the lower surface Wb of the substrate W hardly occur. In addition, for example, contamination of the upper surface Wu of the substrate W and a defect in which an unintended excessive treatment is applied to the upper surface Wu of the substrate W hardly occur. Therefore, the quality of the substrate W can be improved. To an aspect for causing the lifting drive unit  34  to change the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20 , for example, as in the first embodiment, an aspect for causing the lifting drive unit  34  to move the relative position in the vertical direction of the cup unit  30  (for example, the middle cup member  31   b ) with respect to the spin chuck  20  in the downward direction and not to move the relative position in the upward direction may be applied, or an aspect for causing the lifting drive unit  34  to alternately execute the first operation of moving the relative position in the vertical direction of the cup unit  30  (for example, the middle cup member  31   b ) with respect to the spin chuck  20  in the downward direction and the second operation of moving the relative position in the vertical direction of the cup unit  30  (for example, the middle cup member  31   b ) with respect to the spin chuck  20  in the upward direction may be applied. 
     In the first embodiment, for example, the first discharge portion  25   o  as the chemical liquid discharge portion and the second discharge portion  26   o  as the cleaning liquid discharge portion in the lower supply portion  25  may be separate discharge portions or the same discharge portion. For example, the sixth discharge portion  710  as the chemical liquid discharge portion and the fifth discharge portion  73   o  as the cleaning liquid discharge portion in the upper supply portion  46  may be separate discharge portions or the same discharge portion. 
     In the first embodiment, for example, if an aspect for causing the lifting drive unit  34  to move the relative position in the vertical direction of the cup unit  30  (for example, the middle cup member  31   b ) with respect to the spin chuck  20  in the downward direction at the end of the chemical liquid treatment period PD 1  is adopted, unintended treatment and excessive treatment are unlikely to occur on the upper surface Wu and the lower surface Wb of the substrate W until the cleaning treatment period PD 2  is started. 
     In the first embodiment, for example, the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  is changed by the lifting drive unit  34  by causing the lifting drive unit  34  to move the cup unit  30  up and down, but the present invention is not limited thereto. For example, the lifting drive unit  34  may be capable of changing the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  by moving at least one of the spin chuck  20  and the cup unit  30  up and down. 
     In the first embodiment, for example, when the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  is moved in the downward direction by the lifting drive unit  34 , the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  may be moved in the downward direction while finely vibrating or swinging the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20 . Therefore, an aspect for performing control to cause the lifting drive unit  34  to move the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  in the downward direction and not to move the relative position in the upward direction includes, for example, an aspect for moving the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  in the downward direction while changing, such as finely vibrating or swinging, the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20 . In addition, for example, during at least one of the first operation of causing the lifting drive unit  34  to move the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  in the downward direction and the second operation of causing the lifting drive unit  34  to move the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  in the upward direction, the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  may be changed such as being finely vibrated or swung. 
     In the first embodiment, for example, a sensor such as an imaging element capable of monitoring the dry state of the inner wall surface of the cup unit  30  may be provided in the processing unit  1 , and various types of image processing such as binarization processing may be applied to an image obtained by the sensor, so that the dry state of the inner wall surface of the cup unit  30  may be made recognizable. In this case, for example, according to the recognition result of the dry state of the inner wall surface of the cup unit  30 , the control unit  2 , in the chemical liquid treatment period PD 1 , in order to scatter the droplets of the chemical liquid from the substrate W toward the dried portion of the inner wall surface Iwb, may control the speed at which the lifting drive unit  34  moves the relative position in the vertical direction of the cup unit  30  with respect to the spin chuck  20  in the downward direction. 
     It goes without saying that all or a part of each of the first embodiment and the various modifications can be appropriately combined within a consistent range. 
     EXPLANATION OF REFERENCE SIGNS 
     
         
         
           
               1 ,  1 C: processing unit 
               2 : control unit 
               20 : spin chuck 
               22 : rotation mechanism 
               23 : spin base 
               24 : chuck pin 
               25 : lower supply portion 
               25   o : first discharge portion 
               26   o : second discharge portion 
               27   o : third discharge portion 
               30 ,  30 B: cup unit 
               31 B: cup member 
               31   a : inner cup member 
               31   b : middle cup member 
               31   c : outer cup member 
               34 : lifting drive unit 
               40 : blocking member 
               46 ,  46 C: upper supply portion 
               60 C: treatment liquid supply portion 
               61 C: nozzle portion 
               70 ,  70 C: gas-liquid supply portion 
               71   o : sixth discharge portion 
               72   o : fourth discharge portion 
               73   o : fifth discharge portion 
               100 : substrate processing apparatus 
               205 : processing unit 
             Ar 1 : liquid receiving region 
             H 0 : first position 
             L 0 : second position 
             P 0 : virtual axis 
             PD 1 : chemical liquid treatment period 
             PD 2 : cleaning treatment period 
             PD 3 : drying treatment period 
             Pg 1 : program 
             W: substrate 
             Wb: lower surface 
             Wu: upper surface