Patent Publication Number: US-2022238315-A1

Title: Substrate processing method, component processing method, and substrate processing apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority from Japanese Patent Application Nos. 2021-010187 and 2021-078608, filed on Jan. 26, 2021, and May 6, 2021, respectively, with the Japan Patent Office, the disclosures of which are incorporated herein in their entireties by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a substrate processing method, a component processing method, and a substrate processing apparatus. 
     BACKGROUND 
     Japanese Patent Laid-Open Publication No. 2003-188139 discloses a method of removing etching residues adhering to a semiconductor substrate by using a fluorine-containing peeling solution. 
     SUMMARY 
     An embodiment of the present disclosure provides a substrate processing method including: (a) disposing a substrate on a substrate support in a chamber of a substrate processing apparatus; (b) supplying a processing gas including hydrogen fluoride gas into the chamber; (c) controlling a temperature of the substrate support to a first temperature, and a pressure of the hydrogen fluoride gas in the chamber to a first pressure; and (d) controlling the temperature of the substrate support to a second temperature, and the pressure of the hydrogen fluoride gas in the chamber to a second pressure. In a graph with a horizontal axis indicating a temperature and a vertical axis indicating a pressure, the first temperature and the first pressure are positioned in a first region above an adsorption equilibrium pressure curve of hydrogen fluoride, and the second temperature and the second pressure are positioned in a second region below the adsorption equilibrium pressure curve. 
     The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view schematically illustrating a substrate processing apparatus according to an embodiment. 
         FIG. 2  is a view schematically illustrating a plasma processing apparatus according to an embodiment. 
         FIG. 3  is a partially enlarged view of a substrate processing apparatus according to an embodiment. 
         FIG. 4  is a flowchart of a substrate processing method according to an embodiment. 
         FIG. 5  is a partially enlarged cross-sectional view of an example of a substrate to which a substrate processing method according to an embodiment is applicable. 
         FIG. 6  is a graph representing an example of an adsorption equilibrium pressure curve and a saturated vapor pressure curve of hydrogen fluoride. 
         FIG. 7  is a partially enlarged cross-sectional view of an example of a substrate in a case where hydrogen fluoride is adsorbed onto the surface of the substrate. 
         FIG. 8  is a partially enlarged cross-sectional view of an example of a substrate in a case where adsorbed hydrogen fluoride is desorbed. 
         FIG. 9  is a plan view of an example of a substrate having a surface to which a substance produced from a substrate processing apparatus adheres. 
         FIG. 10  is a flowchart of a component processing method according to an embodiment. 
         FIG. 11  is a partially enlarged cross-sectional view of an example of a substrate to which a substrate processing method according to an embodiment is applicable. 
         FIG. 12  is a partially enlarged cross-sectional view of an example of a substrate in a case where hydrogen fluoride is adsorbed onto the surface of the substrate. 
         FIG. 13  is a partially enlarged cross-sectional view of an example of a substrate in a case where adsorbed hydrogen fluoride is desorbed. 
         FIGS. 14A and 14B  are partially enlarged plan views of an example of the surface of a substrate. 
         FIG. 15  is a graph representing an example of a relationship between a pressure of hydrogen fluoride gas and an etching amount. 
         FIG. 16  is a graph representing an example of a relationship between a temperature of a substrate support and an etching amount. 
         FIG. 17  is a graph representing an example of a relationship between an adsorption time and a thickness of a mask or a dimension of an opening of the mask. 
         FIG. 18  is a graph representing an example of a relationship between a temperature and a decreasing rate of a thickness of a mask or an increasing rate of an opening dimension of the mask. 
         FIG. 19  is a graph representing an example of a relationship between a pressure and a decreasing rate of a thickness of a mask or an increasing rate of an opening dimension of the mask. 
         FIG. 20  is a flowchart of a substrate processing method according to an embodiment. 
         FIG. 21  is a view schematically illustrating a substrate processing apparatus according to an embodiment. 
         FIG. 22  is a graph representing an example of a relationship between a depth and a dimension of a recess. 
         FIG. 23  is a graph representing an example of a position of an opening of a mask. 
         FIG. 24  is a partially enlarged cross-sectional view of an example of a substrate. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. The illustrative embodiments described in the detailed description, drawing, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made without departing from the spirit or scope of the subject matter presented here. 
     Hereinafter, various embodiments will be described. 
     An embodiment of the present disclosure provides a substrate processing method for processing a substrate on a substrate support disposed in a chamber of a substrate processing apparatus. The method includes (a) supplying a processing gas including hydrogen fluoride gas into the chamber; (b) controlling a temperature of the substrate support to a first temperature, and a pressure of the hydrogen fluoride gas in the chamber to a first pressure; and (c) controlling the temperature of the substrate support to a second temperature, and the pressure of the hydrogen fluoride gas in the chamber to a second pressure. In a graph with a horizontal axis indicating a temperature and a vertical axis indicating a pressure, the first temperature and the first pressure are positioned in a first region above an adsorption equilibrium pressure curve of hydrogen fluoride, and the second temperature and the second pressure are positioned in a second region below the adsorption equilibrium pressure curve. 
     According to the method of the embodiment above, when a substance (e.g., an etching residue or particles) exists on the surface of the substrate, the substance may be removed with the desorption of hydrogen fluoride. 
     In the graph above, the first region may be present below a saturated vapor pressure curve of hydrogen fluoride. The first temperature and the second temperature may be in the range of −140° C. or higher and 0° C. or lower, and the first pressure and the second pressure may be in the range of 1 Pa or more and 1×10 5  Pa or less. 
     The substrate may include a silicon-containing film. In this case, the substance produced from the silicon-containing film may be removed with the desorption of hydrogen fluoride. 
     The substrate may include a metal-containing film. In this case, the substance produced from the metal-containing film may be removed with the desorption of hydrogen fluoride. 
     In (b) above, a substance produced from the substrate processing apparatus may adhere to the surface of the substrate. In this case, the substance produced from the substrate processing apparatus may be removed with the desorption of hydrogen fluoride. 
     The processing gas may include an inert gas. In this case, the amount of the substance to be removed may be adjusted by adjusting a flow rate ratio of the inert gas. 
     Another embodiment of the present disclosure provides a method of processing a component disposed in a chamber of a substrate processing apparatus. The method includes: (a) supplying a processing gas including hydrogen fluoride gas into the chamber; (b) controlling a temperature of the component to a first temperature, and a pressure of the hydrogen fluoride gas in the chamber to a first pressure; and (c) controlling the temperature of the component to a second temperature, and the pressure of the hydrogen fluoride gas in the chamber to a second pressure. In a graph with a horizontal axis indicating a temperature and a vertical axis indicating a pressure, the first temperature and the first pressure are positioned in a first region above an adsorption equilibrium pressure curve of hydrogen fluoride, and the second temperature and the second pressure are positioned in a second region below the adsorption equilibrium pressure curve. 
     According to the method of the embodiment above, when a substance (e.g., an etching residue or particles) exists on the surface of the component, the substance may be removed with the desorption of hydrogen fluoride. 
     Yet another embodiment of the present disclosure provides a substrate processing apparatus. The substrate processing apparatus includes: a chamber; a substrate support configured to support a substrate in the chamber; a gas supply configured to supply a processing gas including hydrogen fluoride gas into the chamber; and a controller. The controller is configured to control a temperature of the substrate support to a first temperature, and a pressure of the hydrogen fluoride gas in the chamber to a first pressure; and control the temperature of the substrate support to a second temperature, and the pressure of the hydrogen fluoride gas in the chamber to a second pressure. In a graph with a horizontal axis indicating a temperature and a vertical axis indicating a pressure, the first temperature and the first pressure are positioned in a first region above an adsorption equilibrium pressure curve of hydrogen fluoride, and the second temperature and the second pressure are positioned in a second region below the adsorption equilibrium pressure curve. 
     According to the substrate processing apparatus of the embodiment above, when a substance (e.g., an etching residue or particles) exists on the surface of the substrate, the substance may be removed with the desorption of hydrogen fluoride. 
     Yet another embodiment of the present disclosure provides a substrate processing method. The method includes: (a) providing a substrate including a base film and a mask provided on the base film, the mask having an opening therein; (b) etching the base film using plasma; and (c) supplying hydrogen fluoride to the mask, thereby removing a deposit adhering to the opening of the mask in (b). 
     According to the method of the embodiment above, the deposit may be removed by hydrogen fluoride in (c). 
     In (c) above, hydrogen fluoride gas may be supplied without generating plasma. In this case, the etching of the mask by plasma is suppressed. 
     In (c) above, hydrofluoric acid may be supplied. In this case, the deposit may be removed by hydrofluoric acid. 
     The method above may further include (d) etching the base film using plasma, after (c). In this case, the deposit is removed in (c). Thus, a recess having a desired shape may be formed on the base film through the etching performed after (c). 
     The method above may further include (e) supplying hydrogen fluoride to the mask, thereby removing the deposit adhering to the opening of the mask in (d). In this case, the deposit may be removed by hydrogen fluoride in (e). 
     The mask may contain silicon. 
     The base film may contain carbon. 
     Yet another embodiment of the present disclosure provides a substrate processing apparatus. The substrate processing apparatus includes: a chamber; a substrate support configured to support a substrate in the chamber, the substrate including a base film and a mask provided on the base film, the mask having an opening therein; a gas supply configured to supply each of a first processing gas and a second processing gas into the chamber, the second processing gas including hydrogen fluoride gas; a plasma generator configured to generate plasma from the first processing gas in the chamber; and a controller. The controller is configured to control the gas supply and the plasma generator to etch the base film using the plasma, and control the gas supply to supply the second processing gas to the mask, thereby removing a deposit adhering to the opening of the mask when the base film is etched. 
     According to the substrate processing apparatus of the embodiment above, the deposit may be removed by the second processing gas including hydrogen fluoride gas. 
     Yet another embodiment of the present disclosure provides a substrate processing apparatus. The substrate processing apparatus includes: a chamber; a substrate support configured to support a substrate in the chamber, the substrate including a base film and a mask provided on the base film, the mask having an opening therein; a gas supply configured to supply a first processing gas into the chamber; a plasma generator configured to generate plasma from the first processing gas in the chamber; a wet processing apparatus including a container for accommodating hydrofluoric acid; and a controller. The controller is configured to control the gas supply and the plasma generator to etch the base film using the plasma, and control the wet processing apparatus to supply the hydrofluoric acid to the mask, thereby removing a deposit adhering to the opening of the mask when the base film is etched. 
     According to the substrate processing apparatus of the embodiment above, the deposit may be removed by hydrofluoric acid. 
     Hereinafter, various embodiments will be described in detail with reference to the drawings. In the respective drawings, similar or corresponding portions will be denoted by the same reference numerals. 
       FIGS. 1 and 2  are views schematically illustrating a substrate processing apparatus according to an embodiment. A substrate processing apparatus of the present embodiment is, for example, a plasma processing system. 
     In an embodiment, the plasma processing system includes a plasma processing apparatus  1  and a controller  2 . The plasma processing apparatus  1  includes a plasma processing chamber  10 , a substrate support  11 , and a plasma generator  12 . The plasma processing chamber  10  has a plasma processing space. Further, the plasma processing chamber  10  includes at least one gas supply port for supplying at least one processing gas into the plasma processing space, and at least one gas exhaust port for exhausting a gas from the plasma processing space. The gas supply port is connected to a gas supply  20  to be described later, and the gas exhaust port is connected to an exhaust system  40  to be described later. The substrate support  11  is disposed in the plasma processing space, and has a substrate support surface for supporting a substrate. 
     The plasma generator  12  is configured to generate plasma from at least one processing gas supplied into the plasma processing space. The plasma formed in the plasma processing space may be, for example, capacitively coupled plasma (CCP), inductively coupled plasma (ICP), electron-cyclotron-resonance (ECR) plasma, helicon wave excited plasma (HWP), or surface wave plasma (SWP). Various types of plasma generators, including an alternating current (AC) plasma generator and a direct current (DC) plasma generator, may be used. In an embodiment, an AC signal (AC power) used in the AC plasma generator has a frequency in the range of 100 kHz to 10 GHz. Accordingly, the AC signal includes a radio frequency (RF) signal and a microwave signal. In an embodiment, the RF signal has a frequency in the range of 200 kHz to 150 MHz. 
     The controller  2  processes computer-executable commands for causing the plasma processing apparatus  1  to execute various steps to be described therein. The controller  2  may be configured to control each unit of the plasma processing apparatus  1  to execute the various steps to be described herein. In an embodiment, a portion of the controller  2  or the entire controller  2  may be included in the plasma processing apparatus  1 . The controller  2  may include, for example, a computer  2   a . The computer  2   a  may include, for example, a processor (central processing unit; CPU)  2   al , a storage unit  2   a   2 , and a communication interface  2   a   3 . The processor  2   al  may be configured to perform various control operations based on programs stored in the storage unit  2   a   2 . The storage unit  2   a   2  may include a random access memory (RAM), a read only memory (ROM), a hard disk drive (HDD), a solid state drive (SSD), or a combination thereof. The communication interface  2   a   3  may communicate with the plasma processing apparatus  1  through a communication line such as a local area network (LAN). 
     Hereinafter, an example of the configuration of the plasma processing system will be described. 
     The plasma processing system includes the capacitively coupled plasma processing apparatus  1  and the controller  2 . The capacitively coupled plasma processing apparatus  1  includes the plasma processing chamber  10 , the gas supply  20 , a power supply  30 , and the exhaust system  40 . Further, the plasma processing apparatus  1  includes the substrate support  11  and a gas introduction unit. The gas introduction unit is configured to introduce at least one processing gas into the plasma processing chamber  10 . The gas introduction unit includes a shower head  13 . The substrate support  11  is disposed inside the plasma processing chamber  10 . The shower head  13  is disposed above the substrate support  11 . In an embodiment, the shower head  13  makes up at least a portion of the ceiling of the plasma processing chamber  10 . The plasma processing chamber  10  has the plasma processing space  10   s  defined by the shower head  13 , the side wall  10   a  of the plasma processing chamber  10 , and the substrate support  11 . The plasma processing chamber  10  includes at least one gas supply port for supplying at least one processing gas into the plasma processing space  10   s , and at least one gas exhaust port for exhausting a gas from the plasma processing space. The side wall  10   a  is grounded. The shower head  13  and the substrate support  11  are electrically insulated from the housing of the plasma processing chamber  10 . 
     The substrate support  11  includes a main body  111  and a ring assembly  112 . The main body  111  has a central region (substrate support surface)  111   a  for supporting a substrate (wafer) W, and an annular region (ring support surface)  111   b  for supporting the ring assembly  112 . The annular region  111   b  of the main body  111  surrounds the central region  111   a  of the main body  111  in a plan view. The substrate W is placed on the central region  111   a  of the main body  111 , and the ring assembly  112  is disposed on the annular region  111   b  of the main body  111  to surround the substrate W placed on the central region  111   a  of the main body  111 . In an embodiment, the main body  111  includes a base and an electrostatic chuck. The base includes a conductive member. The conductive member of the base functions as a lower electrode. The electrostatic chuck is disposed on the base. The upper surface of the electrostatic chuck serves as the substrate support surface  111   a . The ring assembly  112  includes one or more annular members. At least one of the one or more annular members is an edge ring. Although not illustrated, the substrate support  11  may include a temperature adjustment module configured to adjust at least one of the electrostatic chuck, the ring assembly  112 , and the substrate to a target temperature. The temperature adjustment module may include a heater, a heat transfer medium, a flow path, or a combination thereof. A heat transfer fluid such as brine or a gas flows through the flow path. The substrate support  11  may include a heat transfer gas supply configured to supply a heat transfer gas to the space between the rear surface of the substrate W and the substrate support surface  111   a.    
     The shower head  13  is configured to introduce at least one processing gas from the gas supply  20  into the plasma processing space  10   s . The shower head  13  includes at least one gas supply port  13   a , at least one gas diffusion chamber  13   b , and a plurality of gas introduction ports  13   c . The processing gas supplied to the gas supply port  13   a  passes through the gas diffusion chamber  13   b , and is introduced into the plasma processing space  10   s  from the plurality of gas introduction ports  13   c . The shower head  13  further includes a conductive member. The conductive member of the shower head  13  functions as an upper electrode. The gas introduction unit may include one or a plurality of side gas injectors (SGI) attached to one or a plurality of openings formed in the side wall  10   a , in addition to the shower head  13 . 
     The gas supply  20  may include at least one gas source  21  and at least one flow rate controller  22 . In an embodiment, the gas supply  20  is configured to supply at least one processing gas from the corresponding gas source  21  to the shower head  13  via the corresponding flow rate controller  22 . Each flow rate controller  22  may include, for example, a mass flow controller or a pressure-controlled flow rate controller. The gas supply  20  may further include one or more flow rate modulation devices that modulate or pulse the flow rate of at least one processing gas. 
     The power supply  30  includes an RF power supply  31  coupled to the plasma processing chamber  10  via at least one impedance matching circuit. The RF power supply  31  is configured to supply at least one RF signal, such as a source RF signal or a bias RF signal, to a conductive member of the substrate support  11  and/or the conductive member of the shower head  13 . As a result, plasma is formed from at least one processing gas supplied to the plasma processing space  10   s . Accordingly, the RF power supply  31  may function as at least a portion of a plasma generator configured to generate plasma from one or more processing gases in the plasma processing chamber  10 . Further, by supplying the bias RF signal to the conductive member of the substrate support  11 , a bias electric potential is generated in the substrate W, so that ion components in the formed plasma may be drawn into the substrate W. 
     In an embodiment, the RF power supply  31  includes a first RF generator  31   a  and a second RF generator  31   b . The first RF generator  31   a  is coupled to the conductive member of the substrate support  11  and/or the conductive member of the shower head  13  via at least one impedance matching circuit, and configured to generate a source RF signal (source RF power) for generating plasma. In an embodiment, the RF signal has a frequency in the range of 13 MHz to 150 MHz. In an embodiment, the first RF generator  31   a  may be configured to generate multiple source RF signals having different frequencies. The generated one or more source RF signals are supplied to the conductive member of the substrate support  11  and/or the conductive member of the shower head  13 . The second RF generator  31   b  is coupled to the conductive member of the substrate support  11  via at least one impedance matching circuit, and configured to generate a bias RF signal (bias RF power). In an embodiment, the bias RF signal has a frequency lower than that of the source RF signal. In an embodiment, the bias RF signal has a frequency in the range of 400 kHz to 13.56 MHz. In an embodiment, the second RF generator  31   b  may be configured to generate multiple bias RF signals having different frequencies. The generated one or more bias RF signals are supplied to the conductive member of the substrate support  11 . In various embodiments, at least one of the source RF signal and the bias RF signal may be pulsed. 
     The power supply  30  may further include a direct current (DC) power supply  32  coupled to the plasma processing chamber  10 . The DC power supply  32  includes a first DC generator  32   a  and a second DC generator  32   b . In an embodiment, the first DC generator  32   a  is connected to the conductive member of the substrate support  11 , and configured to generate a first DC signal. The generated first DC signal is applied to the conductive member of the substrate support  11 . In an embodiment, the first DC signal may be applied to another electrode such as an electrode of the electrostatic chuck. In an embodiment, the second DC generator  32   b  is connected to the conductive member of the shower head  13 , and configured to generate a second DC signal. The generated second DC signal is applied to the conductive member of the shower head  13 . In various embodiments, at least one of the first and second DC signals may be pulsed. The first and second DC generators  32   a  and  32   b  may be provided in addition to the RF power supply  31 , or the first DC generator  32   a  may be provided in place of the second RF generator  31   b.    
     The exhaust system  40  may be connected to a gas exhaust port  10   e  provided at, for example, the bottom of the plasma processing chamber  10 . The exhaust system  40  may include a pressure regulating valve and a vacuum pump. The pressure in the plasma processing space  10   s  is regulated by the pressure regulating valve. The vacuum pump may include a turbo molecular pump, a dry pump, or a combination thereof. 
       FIG. 3  is a partially enlarged view of a substrate processing apparatus according to an embodiment. As illustrated in  FIG. 3 , the substrate support  11  may include a temperature adjustment module  113  configured to adjust at least one of the main body  111 , the ring assembly  112 , and the substrate W to a target temperature. The temperature adjustment module  113  may include a heater, a heat transfer medium, a flow path, or a combination thereof. A heat transfer fluid such as brine or a gas flows through the flow path. In an embodiment, the temperature adjustment module  113  includes a coolant flow path  113   a  formed inside the main body  111 . A cooling medium such as cooling water or brine output from a chiller unit flows through a coolant inlet pipe  113   b , the coolant flow path  113   a , and a coolant outlet pipe  113   c , and returns to the chiller unit, which is then controlled to a predetermined temperature and circulates the route described above. As a result, the main body  111  is heat-released and cooled. 
       FIG. 4  is a flowchart of a substrate processing method according to an embodiment. The substrate processing method illustrated in  FIG. 4  (hereinafter, referred to as a “method MT 1 ”) may be executed by the substrate processing apparatus of the embodiment described above. The method MTT is applied to the substrate W. The method MTT includes steps ST 1 , ST 2 , and ST 3 . Steps ST 1 , ST 2 , and ST 3  are executed in this order. Step ST 2  may be executed simultaneously with step ST 1 . 
     Hereinafter, the method MT 1  will be described assuming an example where the method MT 1  is applied to the substrate W by using the substrate processing apparatus of the embodiment described above. When the plasma processing apparatus  1  is used, the method MT 1  may be executed in the plasma processing apparatus  1  through the control of each unit of the plasma processing apparatus  1  by the controller  2 . 
     In the method MT 1 , the substrate W on the substrate support  11  disposed in the plasma processing chamber  10  as illustrated in  FIG. 2  is processed. The substrate W may be cleaned (or etched) according to the method MT 1 . 
       FIG. 5  is a partially enlarged cross-sectional view of an example of a substrate to which the substrate processing method according to an embodiment is applicable. As illustrated in  FIG. 5 , in an embodiment, the substrate W includes a base region UR, a metal-containing film MF, and a silicon-containing film SF. The silicon-containing film SF and the metal-containing film MF are provided on the base region UR, and positioned in the surface Wa of the substrate W. 
     The silicon-containing film SF may contain at least one of oxygen and nitrogen. The silicon-containing film SF may be a single-layer film or a multilayer film. The silicon-containing film SF may be a silicon film, a silicon oxide film, or a silicon nitride film. 
     The silicon-containing film SF may have one or more recesses RS. Each recess RS may be an opening. The recess RS is, for example, a hole or a trench. The recess RS may be formed by an etching using the plasma processing apparatus  1 . The metal-containing film MF may be exposed at the bottom of the recess RS. The metal-containing film MF is not provided below the portion of the silicon-containing film SF between the adjacent recesses RS. 
     A mask may be formed on the silicon-containing film SF to be used for forming the recess RS through an etching. The mask includes, for example, carbon. An etching residue RD 1  or RD 2  generated, for example, when the recess RS is formed through an etching may adhere to the surface Wa of the substrate W. The etching residue RD 1  is a residue (reaction by-product) generated from the silicon-containing film SF. The etching residue RD 2  is a residue (reaction by-product) generated from the metal-containing film MF. 
     In step ST 1 , a processing gas including hydrogen fluoride gas is supplied into the plasma processing chamber  10 . The processing gas may substantially include the hydrogen fluoride gas alone, or may include a gas other than the hydrogen fluoride gas. In an embodiment, the processing gas includes hydrogen fluoride gas and an inert gas. Examples of the inert gas include a noble gas such as argon gas. 
     In step ST 2 , the temperature T of the substrate support  11  is controlled to a first temperature T 1 , and the pressure P of the hydrogen fluoride gas in the plasma processing chamber  10  is controlled to a first pressure P 1 . The controller  2  is configured to perform the controls. 
       FIG. 6  is a graph representing an example of an adsorption equilibrium pressure curve and a saturated vapor pressure curve of hydrogen fluoride. The horizontal axis represents the temperature (° C.). The vertical axis represents the pressure (mTorr). At the temperature and the pressure on an adsorption equilibrium pressure curve C 1  in the graph of  FIG. 6 , the adsorption and the desorption of hydrogen fluoride are in equilibrium. The adsorption equilibrium pressure curve C 1  may be drawn by an exponential function approximated using measurement data based on the Brunauer-Emmet-Teller (BET) adsorption theory. 
     The first temperature T 1  and the first pressure P 1  are present in a first region R 1  above the adsorption equilibrium pressure curve C 1  of hydrogen fluoride. As a result, in step ST 2 , hydrogen fluoride is adsorbed onto the surface Wa of the substrate W. The first region R 1  may be present below the saturated vapor pressure curve C 2  of hydrogen fluoride. In this case, hydrogen fluoride is adsorbed onto the surface Wa of the substrate W in a gas phase. When the first temperature T 1  and the first pressure P 1  are present above the saturated vapor pressure curve C 2 , hydrogen fluoride is adsorbed onto the surface Wa of the substrate Win a liquid phase. The first temperature T 1  may be in the range of −140° C. or higher and 0° C. or lower, or may be in the range of −70° C. or higher and −30° C. or lower. The first pressure P 1  may be in the range of 1 Pa or more and 1×10 5  Pa or less, or may be in the range of 30 Pa or more and 100 Pa or less. The time for step ST 2  is not limited as long as the time falls within a range in which a reaction product is produced as a result of the adsorption of hydrogen fluoride, and a cleaning amount is determined according to the time for step ST 2 . The temperature T of the substrate support  11  may be adjusted using the temperature adjustment module  113 . The temperature of the substrate W may be the same as the temperature T of the substrate support  11 . The pressure P of the hydrogen fluoride gas in the plasma processing chamber  10  may be regulated by controlling the flow rate of the hydrogen fluoride gas using the flow rate controller  22 . When the processing gas includes a gas other than the hydrogen fluoride gas, the pressure P of the hydrogen fluoride gas in the plasma processing chamber  10  is a partial pressure of the hydrogen fluoride gas. No plasma is generated in step ST 2 . 
       FIG. 7  is a partially enlarged cross-sectional view of an example of a substrate in a case where hydrogen fluoride is adsorbed onto the surface of the substrate. As illustrated in  FIG. 7 , hydrogen fluoride is adsorbed onto the surface Wa of the substrate W. A hydrogen fluoride molecule HF 1  in the hydrogen fluoride gas may be adsorbed onto the surface Wa of the substrate W. As a result, a layer HF 2  containing hydrogen fluoride may be formed on the surface Wa of the substrate W. The layer HF 2  is, for example, a hydrogen fluoride molecular layer. The layer HF 2  is formed to cover the etching residue RD 1  or RD 2 . The hydrogen fluoride of the layer HF 2  may react with the etching residue RD 1  or RD 2  to produce a reaction product HF 3  (see  FIG. 8 ) such as silicon fluoride. 
     Prior to step ST 1 , a processing gas including an inert gas without including hydrogen fluoride gas may be supplied into the plasma processing chamber  10 . In this case, the temperature T of the substrate support  11  may be controlled to the first temperature T 1 , and the pressure of the inert gas in the plasma processing chamber  10  may be controlled to the first pressure P 1 . Thereafter, steps ST 1  and ST 2  may be started at the same time, by replacing the processing gas including the inert gas with the processing gas including the hydrogen fluoride gas. 
     In step ST 3 , the temperature T of the substrate support  11  is controlled to a second temperature T 2 , and the pressure P of the hydrogen fluoride gas in the plasma processing chamber  10  is controlled to a second pressure P 2 . The controller  2  is configured to perform the controls. In the graph of  FIG. 6 , the second temperature T 2  and the second pressure P 2  are present in a second region R 2  below the adsorption equilibrium pressure curve C 1 . As a result, in step ST 3 , the hydrogen fluoride adsorbed onto the surface Wa of the substrate W is desorbed. The second temperature T 2  may be in the range of −140° C. or higher and 0° C. or lower, or may be in the range of −70° C. or higher and −30° C. or lower. The second pressure P 2  may be in the range of 1 Pa or more and 1×10 5  Pa or less, or may be in the range of 30 Pa or more and 100 Pa or less. The time for step ST 3  is not limited as long as the time falls within a range in which the reaction product resulting from the adsorption of hydrogen fluoride is desorbed. The second temperature T 2  may be higher than the first temperature T 1 . The second pressure P 2  may be lower than the first pressure P 1 . Step ST 3  may be performed after the supply of the processing gas including the hydrogen fluoride gas is stopped, in order to promote the desorption of hydrogen fluoride. No plasma is generated in step ST 3 . 
       FIG. 8  is a partially enlarged cross-sectional view of an example of a substrate in a case where adsorbed hydrogen fluoride is desorbed. In step ST 3 , the hydrogen fluoride adsorbed onto the surface Wa of the substrate W is desorbed. The hydrogen fluoride molecules adsorbed onto the surface Wa of the substrate W are desorbed and formed into hydrogen fluoride gas. With the desorption of hydrogen fluoride, the etching residue RD 1  or RD 2  may be separated from the surface Wa of the substrate W. As illustrated in  FIG. 8 , the reaction product HF 3  produced in step ST 2  is desorbed from the surface Wa of the substrate W. In this way, in step ST 3 , the etching residue RD  1  or RD  2  may be removed from the surface Wa of the substrate W. 
     According to the method MT 1  described above, for example, when a substance such as the etching residue RD 1  or RD 2  exists on the surface Wa of the substrate W, the substance may be removed with the desorption of hydrogen fluoride. 
     When the substrate W includes the silicon-containing film SF, a substance generated from the silicon-containing film SF may be removed with the desorption of hydrogen fluoride. When the substrate W includes the metal-containing film MF, a substance generated from the metal-containing film MF may be removed with the desorption of hydrogen fluoride. 
     When the processing gas includes an inert gas, the amount of a substance to be removed may be adjusted by adjusting the flow rate ratio of the inert gas. For example, when the flow rate ratio of the inert gas is increased, the flow rate ratio of the hydrogen fluoride gas decreases, so that the amount of the substance to be removed is reduced. 
     Prior to step ST 1 , the substrate W may be etched using plasma generated in the plasma processing chamber  10 . For example, steps ST 1 , ST 2 , and ST 3  may be performed after the recess RS is formed through an etching. As a result, an etching and a cleaning may be continuously performed in situ without taking the substrate W out from the plasma processing chamber  10 . 
       FIG. 9  is a plan view of an example of a substrate having a surface to which a substance produced from the substrate processing apparatus adheres. As illustrated in  FIG. 9 , in step ST 2 , a substance produced from the substrate processing apparatus of the above-described embodiment may adhere to the surface Wa of the substrate W. The substance may be a silicon-containing particle PT 1  produced from the plasma processing apparatus  1  or a metal-containing particle PT 2  produced from the plasma processing apparatus  1 . The silicon-containing particle PT 1  contains, for example, silicon oxide. The metal-containing particle PT 2  contains, for example, yttrium or aluminum. The metal-containing particle PT 2  contains, for example, yttrium oxide or aluminum oxide. 
     When the method MTT is applied to the substrate W of  FIG. 9 , the substance such as the silicon-containing particle PT 1  or the metal-containing particle PT 2  may be removed. 
       FIG. 10  is a flowchart of a component processing method according to an embodiment. The component processing method illustrated in  FIG. 10  (hereinafter, referred to as a “method MT 2 ”) may be executed by the substrate processing apparatus of the above-described embodiment. The method MT 2  is applied to the plasma processing apparatus  1 . When the method MT 2  is executed, the substrate W may not be present in the plasma processing chamber  10 . The method MT 2  includes steps ST 11 , ST 12 , and ST 13 . Steps ST 11 , ST 12 , and ST 13  are executed in this order. Step ST 12  may be executed simultaneously with step ST 11 . 
     Hereinafter, the method MT 2  will be described assuming an example where the method MT 2  is applied to the ring assembly  112  (see  FIG. 3 ) by using the substrate processing apparatus of the above-described embodiment. When the plasma processing apparatus  1  is used, the method MT 2  may be executed in the plasma processing apparatus  1  through the control of each unit of the plasma processing apparatus  1  by the controller  2 . 
     The method MT 2  processes the ring assembly  112  which is a component disposed in the plasma processing chamber  10 . For example, the substance such as the silicon-containing particle PT 1  or the metal-containing particle PT 2  illustrated in  FIG. 9  may adhere to the surface  112   a  of the ring assembly  112 . The ring assembly  112  may be cleaned (or etched) according to the method MT 2 . 
     In step ST 11 , the processing gas including hydrogen fluoride gas is supplied into the plasma processing chamber  10 . Step ST 11  may be executed in the same manner as step ST 1 , except that the substrate W is not placed on the substrate support  11 . 
     In step ST 12 , the temperature TR of the ring assembly  112  is controlled to the first temperature T 1 , and the pressure P of the hydrogen fluoride gas in the plasma processing chamber  10  is controlled to the first pressure P 1 . As a result, hydrogen fluoride is adsorbed onto the surface  112   a  of the ring assembly  112 . Step ST 12  may be executed in the same manner as step ST 2 , except that the substrate W is not placed on the substrate support  11 . The temperature TR of the ring assembly  112  may be the same as the temperature T of the substrate support  11 , and may be adjusted by using the temperature adjustment module  113 . The temperature TR of the ring assembly  112  may be adjusted by using a temperature adjustment module different from the temperature adjustment module  113 . 
     In step ST 13 , the temperature TR of the ring assembly  112  is controlled to the second temperature T 2 , and the pressure P of the hydrogen fluoride gas in the plasma processing chamber  10  is controlled to the second pressure P 2 . As a result, the hydrogen fluoride adsorbed onto the surface  112   a  of the ring assembly  112  is desorbed. Step ST 13  may be executed in the same manner as step ST 3 , except that the substrate W is not placed on the substrate support  11 . 
     According to the method MT 2  described above, when the substance such as the silicon-containing particle PT 1  or the metal-containing particle PT 2  exists on the surface  112   a  of the ring assembly  112 , the substance may be removed with the desorption of hydrogen fluoride. 
     Hereinafter, descriptions will be made assuming an example where the method MT 1  is applied to a substrate W 1  by using the substrate processing apparatus of the above-described embodiment. In this case, when the method MT 1  is executed, the substrate W 1  is used, instead of the substrate W described above. The substrate W 1  may be cleaned (or etched) according to the method MT 1 . 
       FIG. 11  is a partially enlarged cross-sectional view of an example of a substrate to which a substrate processing method according to an embodiment is applicable. As illustrated in  FIG. 11 , in an embodiment, the substrate W 1  includes a carbon-containing film AC and a mask MS provided on the carbon-containing film AC. The carbon-containing film AC may have one or more recesses RS. The carbon-containing film AC may be an amorphous carbon film. The mask MS may be a mask for forming the recess RS through an etching. The mask MS may have an opening MSa positioned on the recess RS. The mask MS may be a film containing silicon, oxygen, and nitrogen. For example, a deposit DP generated when the recess RS is formed through an etching may adhere to the opening MSa of the mask MS. The deposit DP may contain silicon and oxygen. The dimension CD of the opening MSa of the mask MS may be reduced due to the deposit DP. 
       FIG. 12  is a partially enlarged cross-sectional view of an example of a substrate in a case where hydrogen fluoride is adsorbed onto the surface of the substrate. As illustrated in  FIG. 12 , in step ST 12 , hydrogen fluoride is adsorbed onto the surface Wla of the substrate W 1 . The hydrogen fluoride molecule HF 1  in the hydrogen fluoride gas may be adsorbed onto the opening MSa of the mask MS. As a result, an adsorption layer containing hydrogen fluoride may be formed on the surface WIa of the substrate W 1 . The adsorption layer is formed to cover the deposit DP. Hydrogen fluoride in the adsorption layer may react with the deposit DP to produce the reaction product HF 3  (see  FIG. 13 ) such as silicon fluoride. 
       FIG. 13  is a partially enlarged cross-sectional view of an example of a substrate in a case where adsorbed hydrogen fluoride is desorbed. In step ST 3 , the hydrogen fluoride adsorbed onto the surface Wla of the substrate W 1  is desorbed. The hydrogen fluoride molecules adsorbed onto the surface Wla of the substrate W 1  are desorbed and formed into hydrogen fluoride gas. With the desorption of hydrogen fluoride, the deposit DP may be separated from the surface Wla of the substrate W 1 . As illustrated in  FIG. 13 , the reaction product HF 3  produced in step ST 2  is desorbed from the opening MSa of the mask MS. Thus, in step ST 3 , the deposit DP may be removed from the surface Wia of the substrate W 1 . 
     According to the method MT 1  described above, for example, when the substance such as the deposit DP exists on the opening MSa of the mask MS, the substance may be removed with the desorption of hydrogen fluoride. According to the method MT 1 , the dimension CD of the opening MSa of the mask MS may be increased while suppressing the reduction in thickness TH of the mask MS, as compared with a case where the substance is removed by a plasma etching. 
     Hereinafter, various experiments conducted for evaluating the method MT 1  will be described. The experiments described below do not limit the present disclosure. 
     (First Experiment) 
     In a first experiment, a substrate W having a silicon oxide film and a mask on the silicon oxide film was prepared. The silicon oxide film was etched using the mask, so as to form the recess RS. Then, the method MT 1  was executed on the substrate W using the above-described plasma processing system. In step ST 2 , the first temperature T 1  was −70° C., and the first pressure P 1  was 50 Pa. In step ST 3 , the second temperature T 2  was −70° C., and the second pressure P 2  was 2 Pa. 
       FIGS. 14A and 14B  are partially enlarged plan views of an example of the surface of the substrate.  FIG. 14A  represents the surface Wa of the substrate W before the method MT 1  is executed.  FIG. 14B  represents the surface Wa of the substrate W after the method MT 1  is executed. In  FIG. 14A , the etching residue RD 1  adheres to the surface Wa of the substrate W. Meanwhile, in  FIG. 14B , the etching residue RD 1  has been removed from the surface Wa of the substrate W. The same effect is obtained as in a case where the hydrogen fluoride solution is used. 
     (Second Experiment) 
     In a second experiment, a substrate W having a silicon oxide film was prepared. While fixing the temperature T of the substrate support  11  to −70° C., and changing the pressure P of the hydrogen fluoride gas in the plasma processing chamber  10 , the method MT 1  was executed on the substrate W. Then, the etching amount (film thickness reduction amount) of the silicon oxide film was measured. As the etching amount increases, the cleaning effect is improved.  FIG. 15  represents the result. Further, while fixing the pressure P of the hydrogen fluoride gas in the plasma processing chamber  10  to 350 mTorr (1 mTorr=0.133322 Pa), and changing the temperature T of the substrate support  11 , the method MT 1  described above was executed on the substrate W. Then, the etching amount of the silicon oxide film was measured.  FIG. 16  represents the result. 
       FIG. 15  is a graph representing an example of a relationship between the pressure of the hydrogen fluoride gas and the etching amount. The vertical axis represents the etching amount (nm). The horizontal axis represents the pressure P (mTorr) of the hydrogen fluoride gas. Two experiments were conducted for each pressure P. E 1  and E 2  represent results of the two experiments. From  FIG. 15 , it is found that the etching amount increases with the increase of the pressure P. Accordingly, the etching amount may be controlled by adjusting the pressure P. It is also found that the controllability of the etching amount is improved in the low pressure region of 200 mTorr or less. It is also found that the rising profile of the pressure P is similar to the Langmuir adsorption line. This indicates the possibility that the adsorption and the desorption of hydrogen fluoride gas molecules are dominant. 
       FIG. 16  is a graph representing an example of a relationship between a temperature of a substrate support and an etching amount. The vertical axis represents the etching amount (nm). The horizontal axis represents the temperature T (° C.) of the substrate support  11 . Two experiments were conducted for each temperature T. E 3  and E 4  represent results of the two experiments. From  FIG. 16 , it is found that the etching amount decreases with the increase of the temperature T. When the temperature T is −35° C., the etching amount decreases, as compared with a case where the temperature T is −70° C. 
     (Third Experiment) 
     In a third experiment, the substrate W 1  having an amorphous carbon film and a mask on the amorphous carbon film (see  FIG. 11 ) was prepared. The mask is a SiON film. The amorphous carbon film was etched using the mask, so as to form the recess RS. Then, the method MT 1  was executed on the substrate W 1  using the plasma processing system, while changing the time in step ST 2  (adsorption time). The first temperature T 1  and the first pressure P 1  in step ST 2  are present in the first region R 1  above the adsorption equilibrium pressure curve C 1  of hydrogen fluoride. Then, the thickness and the opening dimension of the mask were measured.  FIG. 17  represents the result. 
       FIG. 17  is a graph representing an example of a relationship between the adsorption time and the thickness or the opening dimension of the mask. The vertical axis represents the thickness or the opening dimension (nm) of the mask. The horizontal axis represents the adsorption time (seconds). The result in which the adsorption time is zero indicates the thickness or the dimension in the substrate W 1  before the method MTT is executed. From  FIG. 17 , it is found that when the adsorption time is about 60 seconds, the opening dimension of the mask may be increased while suppressing the reduction in thickness of the mask. 
     (Fourth Experiment) 
     In a fourth experiment, the same substrate W 1  as that in the third experiment was prepared, and the amorphous carbon film was etched using the mask so as to form the recess RS. Then, the method MT 1  was executed on the substrate W 1  using the above-described plasma processing system, while changing the first temperature T 1  in step ST 2 . The first temperature T 1  and the first pressure P 1  in step ST 2  are present in the first region R 1  above the adsorption equilibrium pressure curve C 1  of hydrogen fluoride. Then, the thickness and the opening dimension of the mask were measured, and the decreasing rate of the thickness of the mask and the increasing rate of the opening dimension of the mask were calculated.  FIG. 18  represents the result. 
       FIG. 18  is a graph representing an example of a relationship between the temperature and the decreasing rate of the thickness of the mask or the increasing rate of the opening dimension of the mask. The vertical axis represents the decreasing rate of the thickness of the mask or the increasing rate of the opening dimension of the mask (nm/min). The horizontal axis represents the temperature (° C.). From  FIG. 18 , it is found that as the temperature decreases, the opening dimension of the mask may be increased while suppressing the reduction in thickness of the mask. 
     (Fifth Experiment) 
     In a fifth experiment, the same substrate W 1  as that in the third experiment was prepared, and the amorphous carbon film was etched using the mask so as to form the recess RS. Then, the method MTT was executed on the substrate W 1  using the above-described plasma processing system, while changing the first temperature P 1  in step ST 2 . The first temperature T 1  and the first pressure P 1  in step ST 2  are present in the first region R 1  above the adsorption equilibrium pressure curve C 1  of hydrogen fluoride. Then, the thickness and the opening dimension of the mask were measured, and the decreasing rate of the thickness of the mask and the increasing rate of the opening dimension of the mask were calculated.  FIG. 19  represents the result. 
       FIG. 19  is a graph representing an example of a relationship between the pressure and the decreasing rate of the thickness of the mask or the increasing rate of the opening dimension of the mask. The vertical axis represents the decreasing rate of the thickness of the mask or the increasing rate of the opening dimension of the mask (nm/min). The horizontal axis represents the pressure P (mTorr). From  FIG. 19 , it is found that as the pressure increases, the opening dimension of the mask may be increased while suppressing the reduction in thickness of the mask. 
       FIG. 20  is a flowchart of a substrate processing method according to an embodiment. The substrate processing method illustrated in  FIG. 20  (hereinafter, referred to as a “method MT 3 ”) may be executed by the substrate processing apparatus of the above-described embodiment. When the plasma processing apparatus  1  is used, the method MT 3  may be executed in the plasma processing apparatus  1  through the control of each unit of the plasma processing apparatus  1  by the controller  2 . The method MT 3  includes steps ST 21 , ST 22 , ST 23 , ST 24 , and ST 25 . Steps ST 21  to ST 25  may be executed in this order. Steps ST 21  to ST 25  may be performed in situ or in different chambers. For example, steps ST 21 , ST 22 , and ST 24  may be performed in the plasma processing chamber  10 , and steps ST 23  and ST 25  may be performed in a chamber different from the plasma processing chamber  10 . Steps ST 23  and ST 25  may be performed in a batch or single-wafer manner. At least one of steps ST 24  and ST 25  may be omitted. 
     Hereinafter, referring to  FIGS. 11 to 13 and 20 , descriptions will be made assuming an example where the method MT 3  is applied to the substrate W 1  by using the substrate processing apparatus of the above-described embodiment. The substrate W 1  may be cleaned (or etched) according to the method MT 3 . 
     In step ST 21 , the substrate W 1  is provided. The substrate W 1  includes the carbon-containing film AC as a base film, and the mask MS provided on the carbon-containing film AC and having the opening MSa. As illustrated in  FIG. 2 , the substrate W 1  may be placed on the substrate support  11  disposed in the plasma processing chamber  10 . 
     The mask MS may contain silicon. The mask MS may be a silicon-containing film. The silicon-containing film may include at least one of a silicon film, a silicon nitride film, a silicon carbide film, and a silicon oxynitride film. The silicon-containing film may not include a silicon oxide film. 
     The carbon-containing film AC may be any film that contains carbon, and may include, for example, at least one of a spin-on carbon (SOC) film, an amorphous carbon film, and a resist film. The resist film may be, for example, an ArF resist film or a KrF resist film. A film different from the carbon-containing film AC may be used as the base film. As for the base film different from the carbon-containing film AC, for example, at least one of a polycrystalline silicon film, an amorphous silicon film, and a SiGe film may be used. 
     In step ST 22 , the carbon-containing film AC is etched using plasma, as illustrated in  FIG. 11 . The plasma may be generated from a first processing gas supplied into the plasma processing chamber  10 . The recess RS is formed in the carbon-containing film AC through the etching, and the deposit DP adheres to the opening MSa of the mask MS. 
     In step ST 23 , hydrogen fluoride is supplied to the mask MS so as to remove the deposit DP, as illustrated in  FIGS. 12 and 13 . In an embodiment, a second processing gas that includes hydrogen fluoride gas is supplied into the plasma processing chamber  10 . In step ST 23 , steps ST 1  to ST 3  of the above-described method MT 1  may be executed. The hydrogen fluoride molecule HF 1  in the hydrogen fluoride gas reacts with the deposit DP, and as a result, the reaction product HF 3  such as silicon fluoride may be produced. When the reaction product HF 3  is volatilized, the deposit DP may be removed. In an embodiment, the second processing gas that includes hydrogen fluoride gas is supplied without generating plasma. In this case, the etching of the mask MS by plasma may be suppressed. As a result, the deformation of the mask MS may be suppressed. 
     In step ST 24 , the carbon-containing film AC is etched using plasma as in step ST 22 . 
     In step ST 25 , hydrogen fluoride is supplied to the mask MS so as to remove the deposit DP formed in step ST 24 , as in step ST 23 . 
     After step ST 25 , steps ST 22  and ST 23  may be repeated. As a result, the recess RS may be deepened. 
     According to the method MT 3  described above, the deposit DP may be removed by hydrogen fluoride while suppressing the deformation of the mask MS in step ST 23 . Accordingly, in step ST 24 , the recess RS having a desired shape may be formed in the carbon-containing film AC. For example, as compared with a case where the deposit DP is removed by using plasma generated from a fluorine-containing gas instead of hydrogen fluoride, the shape defect (bowing) of the recess RS may be suppressed. This is believed to be because step ST 24  may be executed in a state where the inclination of a shoulder portion of the mask MS is relatively small. 
     In an example, the recess RS having the desired shape has a side wall parallel to the thickness direction of the carbon-containing film AC. In another example, the recess RS having the desired shape has a side wall inclined to the thickness direction of the carbon-containing film AC. For example, the side wall of the recess RS has a tapered shape. 
       FIG. 21  is a view schematically illustrating a substrate processing apparatus according to an embodiment. The method MT 3  may be applied to the substrate W 1  by using the substrate processing apparatus illustrated in  FIG. 21 . 
     The substrate processing apparatus of  FIG. 21  includes a plasma processing apparatus  1 , a controller  2 , and a wet processing apparatus  200 . The substrate processing apparatus may include a transfer robot that transfers the substrate W 1  between the plasma processing apparatus  1  and the wet processing apparatus  200 . The controller  2  is configured to control each unit of the plasma processing apparatus  1  and the wet processing apparatus  200 . The method MT 3  may be executed in the substrate processing apparatus of  FIG. 21  under the control by the controller  2 . 
     The wet processing apparatus  200  may include a container  210  for accommodating hydrofluoric acid, a container  212  for accommodating a rinse liquid, and a container  214  for accommodating deionized water. The wet processing apparatus  200  may include a dryer for drying the substrate W 1 . 
     The wet processing apparatus  200  may include a carry-in port  216  for receiving the substrate W 1  carried out from the plasma processing apparatus  1 , a carry-out port  218  for carrying out the substrate W 1  to the plasma processing apparatus  1 , and a transfer robot  220  that transfers the substrate W 1 . The transfer robot  220  transfers the substrate W 1  from the carry-in port  216  to the container  210 . The transfer robot  220  transfers the substrate W 1  from the container  210  to the container  212 . The transfer robot  220  transfers the substrate W 1  from the container  212  to the container  214 . The transfer robot  220  transfers the substrate W 1  from the container  214  to the carry-out port  218 . 
     When the method MT 3  is executed in the substrate processing apparatus of  FIG. 21 , steps ST 21 , ST 22 , and ST 24  may be performed in the plasma processing apparatus  1 . Steps ST 23  and ST 25  may be performed in the wet processing apparatus  200 . In steps ST 23  and ST 25 , hydrofluoric acid is supplied to the substrate W 1 . As a result, the deposit DP is removed by hydrofluoric acid. The substrate W 1  may be immersed in the hydrofluoric acid of the container  210 . Then, the substrate W 1  may be immersed in the rinse liquid of the container  212 . Then, the substrate W 1  may be immersed in the deionized water of the container  214 . Then, the substrate W 1  may be dried in the dryer of the wet processing apparatus  200 . Alternatively, the substrate W 1  may be dried by the decompression in the plasma processing chamber  10  of the plasma processing apparatus  1 . 
     Hereinafter, various experiments conducted for evaluating the method MT 1  will be described. The experiments described below do not limit the present disclosure. 
     (Sixth Experiment) 
     In a sixth experiment, a substrate having an amorphous carbon film and a mask provided on the amorphous carbon film was prepared. The mask is a silicon oxynitride film. Then, steps ST 21  to ST 23  of the method MT 3  described above were executed on the substrate. In step ST 22 , the amorphous carbon film was etched using plasma. In step ST 23 , the substrate was immersed in hydrofluoric acid. As a result, the deposit adhering to the opening of the mask by the etching was removed. 
     (Seventh Experiment) 
     In a seventh experiment, without performing step ST 23  after step ST 22 , the deposit adhering to the opening of the mask was removed using plasma generated from a fluorine-containing gas, instead of hydrogen fluoride. 
     (Result) 
     The depth and the dimension of the recess formed in the amorphous carbon film were measured from the cross-sectional image of the substrate obtained in the sixth and seventh experiments.  FIG. 22  represents the result. 
       FIG. 22  is a graph representing an example of a relationship between the depth and the dimension of the recess. The vertical axis represents the depth (μm) of the recess formed in the amorphous carbon film. The position where the value on the vertical axis is 0 μm is the boundary position between the amorphous carbon film and the mask. The horizontal axis represents the dimension (nm) of the recess formed in the amorphous carbon film. In the graph, E 6  represents the result of the sixth experiment, and E 7  represents the result of the seventh experiment. As illustrated in  FIG. 22 , the dimension of the recess in the sixth experiment is smaller than the dimension of the recess in the seventh experiment, in the depth range of −0.5 μm to 0 μm and the depth range of −3 μm to −1 μm. This indicates that the shape defect (bowing) of the recess is suppressed in the sixth experiment, as compared with the seventh experiment. 
     The position of the opening of the mask was measured from the cross-sectional image of the substrate obtained in the sixth and seventh experiments.  FIG. 23  represents the result. 
       FIG. 23  is a graph representing an example of the position of the opening of the mask. The vertical axis represents the position (μm) in the thickness direction of the mask. The position where the value on the vertical axis is 0 μm is the boundary position between the amorphous carbon film and the mask. The horizontal axis represents the position (nm) in the plane direction of the substrate (the direction perpendicular to the thickness direction of the mask). The position where the value on the horizontal axis is 0 μm is the center position of the opening of the mask. In the graph, E 8  represents the result of the sixth experiment, and E 9  represents the result of the seventh experiment. As illustrated in  FIG. 23 , the thickness of the mask in the sixth experiment is larger than the thickness of the mask in the seventh experiment. This indicates that the etching of the mask is suppressed in the sixth experiment, as compared with the seventh experiment. Further, as illustrated in  FIG. 23 , the inclination E 8   a  of the shoulder portion of the mask to the plane direction of the substrate W 1  in the sixth experiment is smaller than the inclination E 9   a  of the shoulder portion of the mask to the plane direction of the substrate W 1  in the seventh experiment. This indicates that the shoulder portion of the mask is hardly deformed in the sixth experiment, as compared with the seventh experiment. 
       FIG. 24  is a partially enlarged cross-sectional view of an example of a substrate. As illustrated in  FIG. 24 , in the cross section of the substrate W 1 , the shoulder portion of the mask MS is inclined by an angle θ with respect to the plane direction of the substrate W 1 . When the angle θ is relatively small, ions I 1  in plasma collide with the shoulder portion of the mask, and sputter the mask. Meanwhile, when the angle θ is relatively large, ions I 2  in plasma may be reflected into the recess RS due to the shoulder portion of the mask. As a result, since the side wall of the recess RS is etched by the ions I 2 , the shape defect (bowing) of the recess may easily occur. 
     While various embodiments have been described, various additions, omissions, substitutions, and changes may be made without being limited to the embodiments. Further, components in different embodiments may be combined with each other to form another embodiment. 
     For example, the substrate processing apparatus may not include the plasma generator  12 . In this case, the plasma processing is not performed in the chamber of the substrate processing apparatus. The methods MT 1  and MT 2  may be performed by using the substrate processing apparatus. 
     According to an embodiment, it is possible to provide a substrate processing method, a component processing method, and a substrate processing apparatus, which are capable of removing a substance present on the surface of a substrate or a component. 
     From the foregoing, it will be appreciated that various embodiments of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various embodiments disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.