Patent Publication Number: US-11028483-B2

Title: Plating method, plating apparatus and recording medium

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This Application is a U.S. national phase application under 35 U.S.C. § 371 of PCT Application No. PCT/JP2017/031003 filed on Aug. 29, 2017, which claims the benefit of Japanese Patent Application No. 2016-210901 filed on Oct. 27, 2016, the entire disclosures of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The various aspects and embodiments described herein pertain generally to a plating method, a plating apparatus and a recording medium. 
     BACKGROUND 
     Recently, as miniaturization and three-dimension of semiconductor devices are required, it is required to improve processing accuracy by etching when processing the semiconductor devices. As one way to improve the processing accuracy by etching, it is required to improve accuracy of a hard mask (HM) for dry etching which is formed on a substrate. 
     Patent Document 1: Japanese Patent Laid-open Publication No. 2009-249679 
     In general, however, there are many restrictions for a material of the hard mask. For example, the material of the hard mask needs to have high adhesivity to a substrate and a resist, needs to have high resistance against a heat treatment, and an etching processing, and, also, needs to be easily removed. For the reason, conventionally, only a limited material such as SiN (silicon nitride) or TiN (titanium nitride) has been used as the material of the hard mask. 
     In view of this, the present inventors have examined providing a film of SiO 2  (silicon oxide) or the like and a film of SiN (silicon nitride) or the like on a substrate; applying a catalyst such as Pd on the substrate to selectively apply the catalyst on the SiN film; and forming a plating layer only on the SiN film by using this catalyst. In this case, as the plating layer formed on the SiN film can be used as the hard mask, it is possible to select various kinds of materials as the plating layer. 
     Meanwhile, the SiO film on the substrate may have a minute lattice defect, an impurity, or the like. In such a case, the catalyst of Pd or the like may adhere to the lattice defect or the impurity. Accordingly, if the plating processing is performed in this state, the plating layer may be formed on a part of the SiO film as well, which is not intended originally, raising a concern that such an unnecessary plating layer might end up as a defect. 
     SUMMARY 
     In view of the foregoing, exemplary embodiments provide a plating method, a plating apparatus capable of suppressing generation of a defect on a non-plateable material portion, and a recording medium therefor. 
     In an exemplary embodiment, a plating method includes preparing a substrate having a non-plateable material portion and a plateable material portion formed on a surface thereof; imparting a catalyst selectively to the plateable material portion by performing a catalyst imparting processing on the substrate; and forming a plating layer selectively on the plateable material portion by performing a plating processing on the substrate. Before the imparting of the catalyst, forming an organic film is performed on the substrate by supplying an organic liquid onto the substrate. 
     In another exemplary embodiment, a plating apparatus includes a substrate holding unit configured to hold a substrate having a plateable material portion and a non-plateable material portion on a surface thereof; a catalyst imparting unit configured to impart a catalyst selectively to the plateable material portion by performing a catalyst imparting processing on the substrate; a plating liquid supply unit configured to form a plating layer selectively on the plateable material portion by supplying a plating liquid onto the substrate; and an organic liquid supply unit configured to form an organic film on the substrate by supplying an organic liquid onto the substrate. 
     According to the exemplary embodiments, it is possible to suppress the generation of the defect on the non-plateable material portion. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic plan view illustrating a configuration of a plating apparatus and a plating unit provided in the plating apparatus. 
         FIG. 2  is a schematic cross sectional view illustrating a configuration of a plating device belonging to the plating unit shown in  FIG. 1 . 
         FIG. 3  is a schematic cross sectional view illustrating a structure of a substrate on which a plating layer is to be formed by a plating method according to an exemplary embodiment. 
         FIG. 4A  to  FIG. 4E  are schematic cross sectional views illustrating a manufacturing method for a substrate on which the plating layer is to be formed by the plating method according to the present exemplary embodiment. 
         FIG. 5  is a flowchart illustrating the plating method according to the exemplary embodiment. 
         FIG. 6A  to  FIG. 6C  are schematic cross sectional views illustrating the plating method according to the exemplary embodiment. 
         FIG. 7A  to  FIG. 7C  are schematic cross sectional views illustrating a method of processing the substrate on which the plating layer is formed by the plating method according to the present exemplary embodiment. 
         FIG. 8A  and  FIG. 8B  are schematic diagrams illustrating an operation where a catalyst acts when it is attached to a surface of the substrate. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, exemplary embodiments will be explained with reference to the accompanying drawings. 
     &lt;Configuration of Plating Apparatus&gt; 
     Referring to  FIG. 1 , a configuration of a plating apparatus according to an exemplary embodiment will be explained.  FIG. 1  is a schematic diagram illustrating the configuration of the plating apparatus according to the exemplary embodiment. 
     As depicted in  FIG. 1 , a plating apparatus  1  according to the present exemplary embodiment is equipped with a plating unit  2  and a controller  3  configured to control an operation of the plating unit  2 . 
     The plating unit  2  is configured to perform various processings on a substrate. The various processings performed by the plating unit  2  will be discussed later. 
     The controller  3  is implemented by, for example, a computer, and includes an operation controller and a storage unit. The operation controller is implemented by, for example, a CPU (Central Processing Unit) and is configured to control an operation of the plating unit  2  by reading and executing the programs stored in the storage unit. The storage unit is implemented by a memory device such as, but not limited to, a RAM (Random Access Memory), a ROM (Read Only Memory) or a hard disk, and stores thereon programs for controlling various processings performed in the plating unit  2 . Further, the programs may be recorded in a computer-readable recording medium, or may be installed from the recording medium to the storage unit. The computer-readable recording medium may be, for example, a hard disc (HD), a flexible disc (FD), a compact disc (CD), a magnet optical disc (MO), or a memory card. Stored in the recording medium is a program which, when executed by a computer for controlling an operation of the plating apparatus  1 , allows the computer to control the plating apparatus  1  to perform a plating method to be described later. 
     &lt;Configuration of Plating Unit&gt; 
     Referring to  FIG. 1 , a configuration of the plating unit  2  will be discussed.  FIG. 1  is a schematic plan view illustrating the configuration of the plating unit  2 . 
     The plating unit  2  includes a carry-in/out station  21  and a processing station  22  which is provided adjacent to the carry-in/out station  21 . 
     The carry-in/out station  21  is equipped with a placing section  211  and a transfer section  212  which is provided adjacent to the placing section  211 . 
     In the placing section  211 , transfer containers (hereinafter, referred to as “carriers C”) for accommodating therein a plurality of substrates W horizontally are placed. 
     The transfer section  212  is equipped with a transfer device  213  and a delivery unit  214 . The transfer device  213  is provided with a holding mechanism configured to hold a substrate W and is configured to be movable horizontally and vertically and pivotable around a vertical axis. 
     The processing station  22  includes plating devices  5 . In the present exemplary embodiment, the number of the plating devices  5  belonging to the processing station  22  is two or more. However, only one plating device  5  may be provided. The plating devices  5  are arranged at both sides of a transfer path  221  which is extended in a preset direction. 
     A transfer device  222  is provided in the transfer path  221 . The transfer device  222  is equipped with a holding mechanism configured to hold the substrate W and is configured to be movable horizontally and vertically and pivotable around a vertical axis. 
     In the plating unit  2 , the transfer device  213  of the carry-in/out station  21  is configured to transfer the substrate W between the carrier C and the delivery unit  214 . To elaborate, the transfer device  213  takes out the substrate W from the carrier C which is placed in the placing section  211 , and places the substrate W in the delivery unit  214 . Further, the transfer device  213  takes out the substrate W which is placed in the delivery unit  214  by the transfer device  222  of the processing station  22 , and accommodates the substrate W back into the carrier C on the placing section  211 . 
     In the plating unit  2 , the transfer device  222  of the processing station  22  is configured to transfer the substrate W between the delivery unit  214  and the plating device  5  and between the plating device  5  and the delivery unit  214 . To elaborate, the transfer device  222  takes out the substrate W which is placed in the delivery unit  214  and then carries the substrate W into the plating device  5 . Further, the transfer device  222  takes out the substrate W from the plating device  5  and places the substrate W in the delivery unit  214 . 
     &lt;Configuration of Plating Device&gt; 
     Referring to  FIG. 2 , a configuration of the plating device  5  will be explained.  FIG. 2  is a schematic cross sectional view illustrating the configuration of the plating device  5 . 
     The plating device  5  is configured to perform a plating processing on a substrate W having a non-plateable material portion  31  and a plateable material portion  32  on a surface thereof, and configured to form a plating layer  35  selectively on the plateable material portion (see  FIG. 3  to  FIG. 7D  to be described later). A substrate processing performed by the plating device  5  includes a catalyst imparting processing and an electroless plating processing at least. However, the substrate processing may further include processings other than the catalyst imparting processing and the plating processing. 
     The plating device  5  is configured to perform a substrate processing including the aforementioned electroless plating processing. The plating device  5  includes a chamber  51 ; a substrate holding unit  52  provided within the chamber  51  and configured to hold the substrate W; and a plating liquid supply unit  53  configured to supply a plating liquid M 1  to the substrate W held by the substrate holding unit  52 . 
     The substrate holding unit  52  includes a rotation shaft  521  extended in a vertical direction within the chamber  51 ; a turntable  522  provided at an upper end portion of the rotation shaft  521 ; a chuck  523  provided on an outer peripheral portion of a top surface of the turntable  522  and configured to support an edge portion of the substrate W; and a driving unit  524  configured to rotate the rotation shaft  521 . 
     The substrate W is supported by the chuck  523  to be horizontally held by the turntable  522  while being slightly spaced apart from the top surface of the turntable  522 . In the present exemplary embodiment, a mechanism of holding the substrate W by the substrate holding unit  52  is of a so-called mechanical chuck type in which the edge portion of the substrate W is held by the chuck  523  which is configured to be movable. However, a so-called vacuum chuck type of vacuum-attracting a rear surface of the substrate W may be used instead. 
     A base end portion of the rotation shaft  521  is rotatably supported by the driving unit  524 , and a leading end portion of the rotation shaft  521  sustains the turntable  522  horizontally. If the rotation shaft  521  is rotated, the turntable  522  placed on the upper end portion of the rotation shaft  521  is rotated, and, as a result, the substrate W which is held by the turntable  522  with the chuck  523  is also rotated. 
     The plating liquid supply unit  53  is equipped with a nozzle  531  configured to discharge the plating liquid M 1  onto the substrate W held by the substrate holding unit  52 ; and a plating liquid supply source  532  configured to supply the plating liquid M 1  to the nozzle  531 . The plating liquid M 1  is stored in a tank of the plating liquid supply source  532 , and the plating liquid M 1  is supplied into the nozzle  531  from the plating liquid supply source  532  through a supply passageway  534   a  which is equipped with a flow rate controller such as a valve  533 . 
     The plating liquid M 1  is an autocatalytic (reduction) plating liquid for electroless plating. The plating liquid M 1  contains a metal ion such as a cobalt (Co) ion, a nickel (Ni) ion, a tungsten (W) ion; and a reducing agent such as hypophosphorous acid or dimethylamineborane. Further, in the autocatalytic (reduction) electroless plating, the metal ion in the plating liquid M 1  is reduced by the electrons emitted in an oxidation reaction of the reducing agent in the plating liquid M 1  to be precipitated as a metal, so that a metal film (plating film) is formed. The plating liquid M 1  may further contain an additive or the like. The metal film (plating film) formed by the plating processing with the plating liquid M 1  may be, by way of non-limiting example, CoB, CoP, CoWP, CoWB, CoWBP, NiWB, NiB, NiWP, NiWBP, or the like. P in the metal film (plating film) is originated from the reducing agent (e.g., hypophosphorous acid) containing P, and B in the plating film is originated from the reducing agent (e.g., dimethylamineborane) containing B. 
     The nozzle  531  is connected to a nozzle moving device  54 . The nozzle moving device  54  is configured to drive the nozzle  531 . The nozzle moving device  54  includes an arm  541 , a moving body  542  which is configured to be movable along the arm  541  and has a driving mechanism embedded therein; and a rotating/elevating device  543  configured to rotate and move the arm  541  up and down. The nozzle  531  is provided at the moving body  542 . The nozzle moving device  54  is capable of moving the nozzle  531  between a position above a center of the substrate W held by the substrate holding unit  52  and a position above a periphery of the substrate W, and is also capable of moving the nozzle  531  up to a stand-by position outside a cup  57  to be described later when viewed from the top. 
     Within the chamber  51 , there are arranged a catalyst solution supply unit (catalyst imparting unit)  55   a , a cleaning liquid supply unit  55   b , a rinse liquid supply unit  55   c  and an organic liquid supply unit  55   d  configured to supply a catalyst solution N 1 , a cleaning liquid N 2 , a rinse liquid N 3  and an organic liquid L 1  onto the substrate W held by the substrate holding unit  52 , respectively. 
     The catalyst solution supply unit (catalyst imparting unit)  55   a  includes a nozzle  551   a  configured to discharge the catalyst solution N 1  onto the substrate W held by the substrate holding unit  52 ; and a catalyst solution supply source  552   a  configured to supply the catalyst solution N 1  to the nozzle  551   a . The catalyst solution N 1  is stored in a tank of the catalyst solution supply source  552   a , and the catalyst solution N 1  is supplied to the nozzle  551   a  from the catalyst solution supply source  552   a  through a supply passageway  554   a  which is provided with a flow rate controller such as a valve  553   a.    
     The cleaning liquid supply unit  55   b  includes a nozzle  551   b  configured to discharge the cleaning liquid N 2  onto the substrate W held by the substrate holding unit  52 ; and a cleaning liquid supply source  552   b  configured to supply the cleaning liquid N 2  to the nozzle  551   b . The cleaning liquid N 2  is stored in a tank of the cleaning liquid supply source  552   b , and the cleaning liquid N 2  is supplied to the nozzle  551   b  from the cleaning liquid supply source  552   b  through a supply passageway  554   b  which is provided with a flow rate controller such as a valve  553   b.    
     The rinse liquid supply unit  55   c  includes a nozzle  551   c  configured to discharge the rinse liquid N 3  onto the substrate W held by the substrate holding unit  52 ; and a rinse liquid supply source  552   c  configured to supply the rinse liquid N 3  to the nozzle  551   c . The rinse liquid N 3  is stored in a tank of the rinse liquid supply source  552   c , and the rinse liquid N 3  is supplied to the nozzle  551   c  from the rinse liquid supply source  552   c  through a supply passageway  554   c  which is provided with a flow rate controller such as a valve  553   c.    
     The organic liquid supply unit  55   d  includes a nozzle  551   d  configured to discharge the organic liquid L 1  onto the substrate W held by the substrate holding unit  52 ; and an organic liquid supply source  552   d  configured to supply the organic liquid L 1  to the nozzle  551   d . The organic liquid L 1  is stored in a tank of the organic liquid supply source  552   d , and the organic liquid L 1  is supplied to the nozzle  551   d  from the organic liquid supply source  552   d  through a supply passageway  554   d  which is provided with a flow rate controller such as a valve  553   d.    
     The catalyst solution N 1  contains a metal ion having catalytic activity to the oxidation reaction of the reducing agent in the plating liquid M 1 . In the electroless plating processing, in order for precipitation of the metal ion in the plating liquid M 1  to be started, an initial film surface (that is, a plating target surface of the substrate) needs to have sufficient catalytic activity to the oxidation reaction of the reducing agent in the plating liquid M 1 . As an example, such a catalyst may include, by way of example, but not limitation, an iron group element (Fe, Co, Ni), a platinum metal element (Ru, Rh, Pd, Os, Ir, Pt), Cu, Ag or Au. The metal film having the catalytic activity is formed through a replacement reaction. In the replacement reaction, a component forming the plating target surface of the substrate serves as the reducing agent, and the metal ion (e.g., Pd ion) in the catalyst solution N 1  is reduced to be precipitated on the plating target surface of the substrate. Further, the catalyst solution N 1  may contain a metal catalyst in the form of nanoparticles. To be more specific, the catalyst solution N 1  may contain a metal catalyst in the form of nanoparticles, a dispersant and an aqueous solution. The metal catalyst in the form of nanoparticles may be, by way of non-limiting example, nanoparticle-shaped palladium (Pd). Further, the dispersant serves to allow the metal catalyst in the form of nanoparticles to be easily dispersed in the catalyst solution N 1 . One containing the same component as the main component of the organic liquid L 1  may be used as the dispersant. To be specific, the dispersant may be, by way of non-limiting example, polyvinylpyrrolidone (PVP). 
     As an example of the cleaning liquid N 2 , an organic acid such as a formic acid, malic acid, a succinic acid, a citric acid or a malonic acid, or hydrofluoric acid (DHF) (aqueous solution of hydrogen fluoride) diluted to the extent that it does not corrode the plating target surface of the substrate may be used. 
     As an example of the rinse liquid N 3 , pure water may be used. 
     The organic liquid L 1  is a liquid having a function of suppressing the catalyst to adhere to the non-plateable material portion  31  of the substrate W. As an example of this organic liquid L 1 , one containing polyvinylpyrrolidone (PVP) may be used. 
     The plating device  5  includes a nozzle moving device  56  configured to move the nozzles  551   a  to  551   d . The nozzle moving device  56  is equipped with an arm  561 ; a moving body  562  which is configured to be movable along the arm  561  and has a moving mechanism embedded therein; and a rotating/elevating device  563  configured to rotate and move the arm  561  up and down. The nozzles  551   a  to  551   d  are provided at the moving body  562 . The nozzle moving device  56  is capable of moving the nozzles  551   a  to  551   d  between a position above the central portion of the substrate W held by the substrate holding unit  52  and a position above the peripheral portion of the substrate W, and also capable of moving the nozzles  551   a  to  551   d  up to a stand-by position outside the cup  57  to be described later when viewed from the top. In the present exemplary embodiment, though the nozzles  551   a  to  551   d  are held by the common arm, they may be configured to be held by different arms and moved independently. 
     A heating device  59  (heater) configured to heat-treat (bake) the substrate W held by the substrate holding unit  52  is also provided within the chamber  51 . The heating device  59  serves to volatilize a solvent in the organic liquid L 1  or accelerate polymerization of the organic liquid L 1  by heating the surface of the substrate W on which the organic liquid L 1  is supplied. The heating device  59  heats the surface of the substrate W to a temperature equal to or higher than 100° C. and to the extent that the organic film such as the polyvinylpyrrolidone (PVP) is not decomposed. The heating device  59  is connected to an arm  591 , and this arm  591  is configured to be pivotable and movable up and down by a non-illustrated rotating/elevating device. The heating device  59  is configured to be moved to a position above the substrate W by the rotating/elevating device only when the bake of the substrate W is required. In other cases, the heating device  59  is kept retreated at a position outside the substrate W. 
     The cup  57  is disposed around the substrate holding unit  52 . The cup  57  is configured to receive various kinds of processing liquids (e.g., the plating liquid, the cleaning liquid, the rinse liquid, the organic liquid, etc.) scattered from the substrate W and drain the received processing liquids to the outside of the chamber  51 . The cup  57  is equipped with an elevating device  58  configured to move the cup  57  up and down. 
     &lt;Structure of Substrate&gt; 
     Now, a structure of the substrate in which a plating layer is to be formed by a plating method according to the present exemplary embodiment will be explained. 
     As depicted in  FIG. 3 , a substrate W on which a plating layer  35  is to be formed includes the non-plateable material portion  31  and the plateable material portion  32  respectively formed on a surface thereof. There is no specific limitation in the structure of the non-plateable material portion  31  and the plateable material portion  32  as long as they are exposed at the surface side of the substrate W. In the present exemplary embodiment, the substrate W includes a base member  42  made of the plateable material portion  32  and a core member  41  which is protruded from the base member  42  and is made of the non-plateable material portion  31  having a pattern shape. 
     The non-plateable material portion  31  is a region where a plating metal is not precipitated so that the plating layer  35  is not formed when a plating processing according to the present exemplary embodiment is performed. In the present exemplary embodiment, the non-plateable material portion  31  is made of a material containing SiO 2  as a main component. Further, as will be described later, the non-plateable material portion  31  includes a minute lattice defect, an impurity, or the like. 
     The plateable material portion  32  is a region where the plating metal is selectively precipitated so that the plating layer  35  is formed when the plating processing according to the present exemplary embodiment is performed. In the present exemplary embodiment, the plateable material portion  32  may be made of any one of (1) a material containing at least one of a OCH x  group or a NH x  group; (2) a metal material containing a Si-based material as a main component; (3) a material containing a catalyst metal material as a main component; and (4) a material containing carbon as a main component. 
     (1) In case that the material of the plateable material portion  32  includes, as the main component, the material containing at least one of the OCH x  group or the NH x  group, this material may be a material containing a Si—OCH x  group or a Si—NH x  group such as SiOCH or SiN. 
     (2) In case that the material of the plateable material portion  32  is the metal material containing the Si-based material as the main component, the material of the plateable material portion  32  may be, by way of non-limiting example, B-doped or P-doped poly-Si, poly-Si or Si. 
     (3) In case that the plateable material portion  32  includes, as the main component, the material containing the catalyst metal material as the main component, the material of the plateable material portion  32  may be, by way of example, but not limitation, Cu or Pt. 
     (4) In case that the plateable material portion  32  includes, as the main component, the material containing the carbon as the main component, the material of the plateable material portion  32  may be, for example, amorphous carbon. 
     Now, a method of fabricating the substrate W shown in  FIG. 3  will be explained with reference to  FIG. 4A  to  FIG. 4E . To produce the substrate W shown in  FIG. 3 , the base member  42  made of the plateable material portion  32  is first prepared, as illustrated in  FIG. 4A . 
     Thereafter, as depicted in  FIG. 4B , a film of a material  31   a , which forms the non-plateable material portion  31 , is formed on the entire surface of the base member  42  made of the plateable material portion  32  by a CVD method, a PVD method or the like. The material  31   a  is composed of, for example, the material containing SiO 2  as the main component. 
     Subsequently, as illustrated in  FIG. 4C , a photosensitive resist  33   a  is coated on the entire surface of the material  31   a  forming the non-plateable material portion  31  and is dried. Then, by exposing the photosensitive resist  33   a  through a photo mask and developing it, a resist film  33  having a required pattern is formed, as shown in  FIG. 4D . 
     Afterwards, as depicted in  FIG. 4E , the material  31   a  is dry-etched by using the resist film  33  as a mask. As a result, the core member  41  made of the non-plateable material portion  31  is patterned to have substantially the same shape as the pattern shape of the resist film  33 . Then, by removing the resist film  33 , there is obtained the substrate W having the non-plateable material portion  31  and the plateable material portion  32  formed on the surface thereof. 
     &lt;Plating Method&gt; 
     Now, a plating method using the plating apparatus  1  will be discussed. The plating method performed by plating apparatus  1  includes a plating processing upon the aforementioned substrate W. The plating processing is performed by the plating device  5 . An operation of the plating device  5  is controlled by the controller  3 . 
     First, the substrate W having the non-plateable material portion  31  and the plateable material portion  32  formed on the surface thereof is prepared by performing the above-described method of  FIG. 4A  to  FIG. 4E  (preparation process: process S 1  of  FIG. 5 ) (see  FIG. 6A ). 
     The prepared substrate W is then carried into the plating device  5  and is held by the substrate holding unit  52  (see  FIG. 2 ). In the meanwhile, the controller  3  controls the elevating device  58  to move the cup  57  down to a preset position. Then, the controller  3  controls the transfer device  222  to place the substrate W on the substrate holding unit  52 . The substrate W is horizontally placed on the turntable  522  while its periphery portion is held by the chuck  523 . 
     Then, the substrate W held by the substrate holding unit  52  is cleaned (pre-cleaning process: process S 2  of  FIG. 5 ). At this time, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed, the controller  3  controls the cleaning liquid supply unit  55   b  to locate the nozzle  551   b  at a position above the substrate W and to supply the cleaning liquid N 2  onto the substrate W from the nozzle  551   b . The cleaning liquid N 2  supplied onto the substrate W is diffused on the surface of the substrate W by a centrifugal force which is caused by the rotation of the substrate W. As a result, a deposit or the like adhering to the substrate W is removed from the substrate W. The cleaning liquid N 2  scattered from the substrate W is drained through the cup  57 . 
     Subsequently, the substrate W after being cleaned is rinsed (rinsing process: process S 3  of  FIG. 5 ). At this time, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed, the controller  3  controls the rinse liquid supply unit  55   c  to locate the nozzle  551   c  at a position above the substrate W and to supply the rinse liquid N 3  onto the substrate W from the nozzle  551   c . The rinse liquid N 3  supplied onto the substrate W is diffused on the surface of the substrate W by the centrifugal force which is caused by the rotation of the substrate W. As a result, the cleaning liquid N 2  remaining on the substrate W is washed away. The rinse liquid N 3  scattered from the substrate W is drained through the cup  57 . 
     Then, the organic film is formed on the substrate W held by the substrate holding unit  52  (organic film forming process: process S 4  of  FIG. 5 ). At this time, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed, the controller  3  controls the organic liquid supply unit  55   d  to locate the nozzle  551   d  at a position above the substrate W and to supply the organic liquid L 1  onto the substrate W from the nozzle  551   d . As an example of the organic liquid L 1 , polyvinylpyrrolidone (PVP) may be used. The organic liquid L 1  supplied onto the substrate W is diffused on the surface of the substrate W by the centrifugal force which is caused by the rotation of the substrate W. As a result, a thin organic film  36  is formed both on the surface of the non-plateable material portion  31  and on the surface of the plateable material portion  32  of the substrate W (see  FIG. 6B ). This organic film  36  serves to suppress a catalyst from adhering to the non-plateable material portion  31  in a catalyst imparting process. The organic liquid L 1  scattered from the substrate W is drained through the cup  57 . 
     Afterwards, the substrate W held by the substrate holding unit  52  is heat-treated (baked) (heat-treatment process: process S 5  of  FIG. 5 ). At this time, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed, the controller  3  controls the heating device  59  to be located at a position above the substrate W and to heat the substrate W. The heating device  59  heats the surface of the substrate W to a temperature equal to or higher than 100° C. and to the extent that the organic film such as the polyvinylpyrrolidone (PVP) is not decomposed. The heating device  59  heats the substrate W such that a surface temperature of the substrate W falls within a range from, e.g., 230° C. to 270° C. As a result, the solvent in the organic liquid L 1  is volatilized, and the polymerization of the organic liquid L 1  can be accelerated. 
     Thereafter, a catalyst imparting processing is performed on the substrate W having the organic film  36  formed thereon (catalyst imparting process: process S 6  of  FIG. 5 ). At this time, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed, the controller  3  controls the catalyst solution supply unit  55   a  to locate the nozzle  551   a  at a position above the substrate W and to supply the catalyst solution N 1  onto the substrate W from the nozzle  551   a . The catalyst solution N 1  supplied onto the substrate W is diffused on the surface of the substrate W by the centrifugal force which is caused by the rotation of the substrate W. The catalyst solution N 1  scattered from the substrate W is drained through the cup  57 . 
     Accordingly, the catalyst is selectively imparted to the plateable material portion  32  of the substrate W, so that the metal film having catalytic activity is formed on the plateable material portion  32 . Meanwhile, the catalyst is not substantially imparted to the non-plateable material portion  31  of the substrate W, which is mainly made of SiO 2 , so that the metal film having the catalytic activity is not formed at this non-plateable material portion  31 . By way of example, the metal having such catalytic activity may include, but not limitation, an iron group element (Fe, Co, Ni), a platinum metal element (Ru, Rh, Pd, Os, Ir, Pt), Cu, Ag or Au. Each of these metals have high adsorption property to the material (e.g., SiN) forming the plateable material portion  32 , whereas each of these metals is difficult to adsorb with respect to the material (e.g., SiO 2 ) forming the non-plateable material portion  31 . For this reason, by using each of the aforementioned metals, a plating metal can be selectively precipitated on the plateable material portion  32 . To be specific, the catalyst solution N 1  may contain the Pd catalyst in the form of nanoparticles, the dispersant composed of polyvinylpyrrolidone (PVP), and the aqueous solution. Further, the catalyst solution N 1  may contain an adsorption promoter which promotes the adsorption of the metal having the catalytic activity. 
     In the present exemplary embodiment, the organic film  36  is formed on the non-plateable material portion  31 . Accordingly, even if the lattice defect, the impurity or the like exists at a part of the non-plateable material portion  31 , the adhesion of the catalyst to this portion is suppressed as this portion is covered with the organic film  36 . Meanwhile, since the catalyst is strongly adsorbed to the plateable material portion  32 , there is no concern that the presence of the organic film  36  hampers the adhesion of the catalyst to the plateable material portion  32 . 
     Subsequently, the substrate W, in which the catalyst is selectively imparted on the plateable material portion  32 , is cleaned (catalyst solution cleaning process: process S 7  of  FIG. 5 ). To elaborate, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed, the controller  3  controls the rinse liquid supply unit  55   c  to locate the nozzle  551   c  at the position above the substrate W and to supply the rinse liquid N 3  onto the substrate W from the nozzle  551   c . The rinse liquid N 3  supplied onto the substrate W is diffused on the surface of the substrate W by the centrifugal force which is caused by the rotation of the substrate W. As a result, the catalyst solution N 1  remaining on the substrate W is washed away. At this time, the organic film  36  is also removed by the rinse liquid N 3 . Further, even if the catalyst adheres to a part of the non-plateable material portion  31  with the organic film  36  therebetween, this catalyst is washed away along with the organic film  36 . Accordingly, the catalyst is more securely suppressed from remaining on the non-plateable material portion  31 . The rinse liquid N 3  scattered from the substrate W is drained through the cup  57 . Here, the substrate W may be cleaned by using, instead of the rinse liquid N 3 , an acidic cleaning liquid such as, but not limited to, hydrofluoric acid (DHF). 
     Then, the plating processing is performed on the substrate W, and the plating is selectively performed on the plateable material portion  32  (plating process: process S 8  of  FIG. 5 ). Resultantly, the plating layer  35  is formed on the plateable material portion  32  (see  FIG. 6C ). The plating layer  35  is formed at a portion of the plateable material portion  32  where the non-plateable material portion  31  is not covered. At this time, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed or while maintaining the substrate W held by the substrate holding unit  52  stopped, the controller  3  controls the plating liquid supply unit  53  to locate the nozzle  531  at a position above the substrate W and to supply the plating liquid M 1  onto the substrate W from the nozzle  531 . Accordingly, the plating metal is selectively precipitated on the plateable material portion  32  (specifically, on the metal film, having the catalytic activity, formed on the surface of the plateable material portion  32 ) of the substrate W, so that the plating layer  35  is obtained. Meanwhile, since the metal film having the catalytic activity is not formed on the non-plateable material portion  31  of the substrate W, the plating metal is not substantially precipitated and no plating layer  35  is formed thereat. 
     After the plating processing as described above is completed, the substrate W held by the substrate holding unit  52  is cleaned (post-cleaning process: process S 9  of  FIG. 5 ). At this time, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed, the controller  3  controls the cleaning liquid supply unit  55   b  to locate the nozzle  551   b  at the position above the substrate W and to supply the cleaning liquid N 2  onto the substrate W from the nozzle  551   b . The cleaning liquid N 2  supplied onto the substrate W is diffused on the surface of the substrate W by the centrifugal force which is caused by the rotation of the substrate W. Accordingly, the abnormal plating film or the reaction by-product adhering to the substrate W is removed from the substrate W. The cleaning liquid N 2  scattered from the substrate W is drained through the cup  57 . 
     Then, while controlling the driving unit  524  to rotate the substrate W held by the substrate holding unit  52  at a preset speed, the controller  3  controls the rinse liquid supply unit  55   c  to locate the nozzle  551   c  at the position above the substrate W and to supply the rinse liquid N 3  onto the substrate W from the nozzle  551   c  (rinsing process: process S 10  of  FIG. 5 ). Accordingly, the plating liquid M 1 , the cleaning liquid N 2  and the rinse liquid N 3  on the substrate W are scattered from the substrate W by the centrifugal force which is caused by the rotation of the substrate W, and are drained through the cup  57 . 
     Thereafter, the substrate W on which the plating layer  35  is formed is carried out of the plating device  5 . At this time, the controller  3  controls the transfer device  222  to take out the substrate W from the plating device  5  and place the taken-out substrate W in the delivery unit  214 . Then, the controller  3  controls the transfer device  213  to take out the substrate W placed in the delivery unit  214  and to carry the substrate W into the carrier C in the placing section  211 . 
     Then, the substrate W is etched by using the plating layer  35  as a hard mask layer. 
     In this case, the non-plateable material portion  31  is first removed selectively from the substrate W which is taken out of the plating device  5  ( FIG. 7A ). Meanwhile, the plating layer  35  formed on the plateable material portion  32  remains without being removed. 
     Subsequently, as shown in  FIG. 7B , the base member  42  made of the plateable material portion  32  is dry-etched by using the plating layer  35  as a hard mask. Accordingly, the portion of the base member  42  which is not covered with the plating layer  35  is etched to a preset depth, and recesses having a pattern shape are formed. 
     Afterwards, by removing the plating layer  35  through a wet cleaning method, the base member  42  provided with the recesses having the pattern shape is obtained, as illustrated in  FIG. 7C . Since the plating layer  35  can be removed by the wet cleaning method, it is easy to remove the plating layer  35 . An acidic solvent is employed as a chemical liquid for this wet cleaning method. 
     As stated above, according to the present exemplary embodiment, there is performed the process of forming the organic film  36  on the substrate W by supplying the organic liquid L 1  onto the substrate W prior to the process of imparting the catalyst to the substrate W. Accordingly, it is difficult to attach the catalyst to the non-plateable material portion  31 . Thus, even if the lattice defect, the impurity or the like exists at a part of the non-plateable material portion  31 , this portion is covered with the organic film  36 , so that adhesion of the catalyst to this portion is suppressed. As a result, after the plating processing, the plating layer is not formed at the part of the non-plateable material portion  31  where the plating layer is not intended to be formed. Therefore, it is possible to suppress the problem that the non-plateable material portion  31  has the defect. 
     The reason why the catalyst can be suppressed from being attached to the impurity or the like of the non-plateable material portion  31  by the organic film  36  is deemed to be as follows. That is, as shown in  FIG. 8A , after a catalyst A is imparted to the substrate W which is covered with the organic film  36  (after the process S 6  of  FIG. 5 ), the catalyst A is strongly adsorbed to the plateable material portion  32 . Meanwhile, the catalyst A is not substantially adsorbed to the non-plateable material portion  31 . Here, even if a fine impurity D (or a lattice defect), which adsorbs the catalyst A, exists at the non-plateable material portion  31 , since the organic film  36  is provided between the impurity D and the catalyst A, the adsorption power of the catalyst A is sufficiently weakened. Therefore, as shown in  FIG. 8B , after the organic film  36  is removed by cleaning the substrate W (after the process S 7  of  FIG. 5 ), the catalyst A in the vicinity of the impurity D is also washed away along with the organic film  36  by the rinse liquid N 3  or the like. Meanwhile, the catalyst A adsorbed to the plateable material portion  32  is not washed away by the rinse liquid N 3  or the like and remains adsorbed to the plateable material portion  32 . As a comparison, if the organic film  36  is not provided on the substrate W, the catalyst A may be adsorbed to the impurity D, so that the plating layer is unintentionally formed at this portion after the plating processing, resulting in a defect. 
     Furthermore, according to the present exemplary embodiment, there is performed the process of removing the organic film  36  by cleaning the substrate W after the process of imparting the catalyst and before the process of forming the plating layer  35 . Accordingly, even if the catalyst is attached to a part of the non-plateable material portion  31 , this catalyst is washed away along with the organic film  36 . Therefore, the unnecessary plating layer can be suppressed from being formed at the part of the non-plateable material portion  31 . 
     In addition, according to the present exemplary embodiment, after the process of forming the organic film  36  and before the process of imparting the catalyst, the process of heat-treating the substrate W is performed. Therefore, the solvent in the organic liquid L 1  can be volatilized, and the polymerization of the organic liquid L 1  can be accelerated. 
     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. The scope of the inventive concept is defined by the following claims and their equivalents rather than by the detailed description of the exemplary embodiments. It shall be understood that all modifications and embodiments conceived from the meaning and scope of the claims and their equivalents are included in the scope of the inventive concept.