Plating apparatus, plating method, and recording medium

A plating apparatus, a plating method and a recording medium can allow a temperature of a wafer to be uniform within a surface thereof. A plating apparatus 1 includes a substrate holding unit 52 configured to hold a substrate W; a plating liquid supply unit 53 configured to supply a plating liquid M1 to the substrate W; and a solvent supply unit 55a configured to supply a solvent N1 having a different temperature from a temperature of the plating liquid M1 to the substrate W. The solvent N1 is supplied to a preset position on the substrate W from the solvent supply unit 55a after the plating liquid M1 is supplied to the substrate W from the plating liquid supply unit 53.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Japanese Patent Application No. 2016-077255 filed on Apr. 7, 2016, the entire disclosures of which are incorporated herein by reference.

TECHNICAL FIELD

The embodiments described herein pertain generally to a plating apparatus, a plating method and a recording medium.

BACKGROUND

Conventionally, in a plating processing performed in a single-wafer type plating apparatus, it is required to make a temperature of a wafer uniform within a surface thereof. In the single-wafer type plating apparatus, however, a rotating device for rotating the wafer and a chemical liquid supply device for supplying a chemical liquid need to be provided at a rear surface side of the wafer and a front surface side thereof, respectively. For this reason, a sufficient space is difficult to secure at the front surface side of the wafer and the rear surface side thereof, and, thus, it is difficult to provide a temperature control device for directly heating the wafer at the front surface side of the wafer or the rear surface side thereof.

Thus, conventionally, there has been employed such a method of adjusting a temperature of a processing chemical liquid itself and supplying this temperature-controlled processing chemical liquid to the wafer, or a method of supplying a temperature-controlled chemical liquid or hot water to the rear surface side of the wafer. When such a conventional temperature control method is used, however, a temperature of a peripheral portion of the wafer cannot be increased sufficiently, though a central portion of the wafer can be heated in a relatively uniform manner. In this case, there is a concern that a thickness of a plating film may not be uniform within an entire surface of the wafer.

SUMMARY

In view of the foregoing, exemplary embodiments provide a plating apparatus, a plating method and a recording medium capable of allowing a temperature of a wafer to be uniform within a surface thereof.

In one exemplary embodiment, a plating apparatus includes a substrate holding unit configured to hold a substrate; a plating liquid supply unit configured to supply a plating liquid to the substrate; and a solvent supply unit configured to supply a solvent constituting the plating liquid and having a different temperature from a temperature of the plating liquid to the substrate. Here, the solvent is supplied to a preset position on the substrate from the solvent supply unit after the plating liquid is supplied to the substrate from the plating liquid supply unit.

In another exemplary embodiment, a plating method includes a substrate holding process of holding a substrate; a process of supplying a plating liquid to the substrate from a plating liquid supply unit; and a liquid supplying process of supplying a solvent having a temperature different from a temperature of the plating liquid to a preset position on the substrate from a solvent supply unit.

According to the exemplary embodiment, it is possible to allow the temperature of the wafer to be uniform within the surface thereof.

DETAILED DESCRIPTION

Hereinafter, an exemplary embodiment will be explained in detail with reference to the accompanying drawings. Here, however, it should be noted that the present disclosure is not limited to the following exemplary embodiment.

Referring toFIG. 1, a configuration of a plating apparatus according to an exemplary embodiment will be explained.FIG. 1is a schematic diagram illustrating the configuration of the plating apparatus according to the exemplary embodiment.

As depicted inFIG. 1, the plating apparatus1according to the exemplary embodiment includes a plating unit2and a controller3configured to control an operation of the plating unit2.

The plating unit2is configured to perform various processings on a substrate. The various processings performed by the plating unit2will be described later.

The controller3is 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 the operation of the plating unit2by reading and executing a program stored in the storage unit. The storage unit is implemented by a storage device such as, but not limited to, a RAM (Random Access Memory), a ROM (Read Only Memory) or a hard disk, and stores thereon a program for controlling various processings performed in the plating unit2. Further, the program 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. The recording medium has stored thereon a program that, when executed by a computer for controlling an operation of the plating apparatus1, causes the plating apparatus1to perform a plating method to be described later under the control of the computer.

Referring toFIG. 1, a configuration of the plating unit2will be discussed.FIG. 1is a schematic plan view illustrating the configuration of the plating unit2.

The plating unit2includes a carry-in/out station21; and a processing station22provided adjacent to the carry-in/out station21.

The carry-in/out station21includes a placing section211; and a transfer section212provided adjacent to the placing section211.

In the placing section211, multiple transfer containers (hereinafter, referred to as “carriers C”) each of which accommodates a plurality of substrates W horizontally is placed.

The transfer section212is provided with a transfer device213and a delivery unit214. The transfer device213is provided with a holding mechanism configured to hold a substrate W. The transfer device213is configured to be movable horizontally and vertically and pivotable around a vertical axis.

The processing station22includes plating devices5. In the present exemplary embodiment, the number of the plating devices5provided in the processing station22may be two or more, but it is also possible to provide only one plating device5. The plating devices5are arranged at both side of a transfer path221which is extended in a preset direction.

The transfer path221is provided with a transfer device222. The transfer device222includes a holding mechanism configured to hold a substrate W, and is configured to be movable horizontally and vertically and pivotable around a vertical axis.

In the plating unit2, the transfer device213of the carry-in/out station21is configured to transfer the substrate W between the carrier C and the delivery unit214. To elaborate, the transfer device213takes out the substrate W from the carrier C placed in the placing section211, and then, places the substrate W in the delivery unit214. Further, the transfer device213takes out the substrate W which is placed in the delivery unit214by the transfer device222of the processing station22, and then, accommodates the substrate W in the carrier C of the placing section211.

In the plating unit2, the transfer device222of the processing station22is configured to transfer the substrate W between the delivery unit214and the plating device5and between the plating device5and the delivery unit214. To elaborate, the transfer device222takes out the substrate W placed in the delivery unit214and carries the substrate W into the plating device5. Further, the transfer device222takes out the substrate W from the plating device5and places the substrate W in the delivery unit214.

Referring toFIG. 2, a configuration of the plating device5will be explained.FIG. 2is a schematic cross sectional view illustrating the configuration of the plating device5.

The plating device5is configured to perform a substrate processing including an electroless plating processing. The plating device5includes a chamber51; a substrate holding unit52provided within the chamber51and configured to hold the substrate W; and a plating liquid supply unit53configured to supply a plating liquid M1to the substrate W held by the substrate holding unit52.

The substrate holding unit52includes a rotation shaft521extended in a vertical direction within the chamber51; a turntable522provided at an upper end portion of the rotation shaft521; a chuck523provided on an outer peripheral portion of a top surface of the turntable522and configured to support an edge portion of the substrate W; and a driving unit524configured to rotate the rotation shaft521.

The substrate W is supported by the chuck523to be horizontally held on the turntable522while being slightly spaced apart from the top surface of the turntable522. In the present exemplary embodiment, a mechanism of holding the substrate W by the substrate holding unit52is of a so-called mechanical chuck type in which the edge portion of the substrate W is held by the chuck523which 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 shaft521is rotatably supported by the driving unit524, and a leading end portion of the rotation shaft521sustains the turntable522horizontally. If the rotation shaft521is rotated, the turntable522placed on the upper end portion of the rotation shaft521is rotated, and, as a result, the substrate W which is held on the turntable522by the chuck523is also rotated. Further, a non-illustrated temperature control liquid supply device may be provided within the rotation shaft521and may be configured to supply a temperature control fluid such as hot water, vapour or a chemical liquid toward the rear surface of the substrate W from the side of the substrate holding unit52.

The plating liquid supply unit53is equipped with a plating liquid nozzle531configured to discharge the plating liquid M1onto the substrate W held by the substrate holding unit52; and a plating liquid supply source532configured to supply the plating liquid M1to the plating liquid nozzle531. The plating liquid M1is stored in a tank of the plating liquid supply source532, and the plating liquid M1is supplied into the plating liquid nozzle531from the plating liquid supply source532through a supply passageway534which is equipped with a flow rate controller such as a valve533.

The plating liquid M1is an autocatalytic (reduction) plating liquid for electroless plating. The plating liquid M1contains, for example, a metal ion such as a cobalt (Co) ion, a nickel (Ni) ion, a tungsten (W) ion, a copper (Cu) ion, a palladium (Pd) ion, a gold (Au) ion; and a reducing agent such as hypophosphorous acid or dimethylamineborane. The plating liquid M1may further contain an additive or the like. The metal film (plating film) formed by the plating processing with the plating liquid M1may be, by way of non-limiting example, CoWB, CoB, CoWP, CoWBP, NiWB, NiB, NiWP, NiWBP, or the like.

A circulation passageway537provided with a pump535and a heating unit536is connected to the tank of the plating liquid supply source532. The plating liquid M1in the tank is heated or controlled to have a preset temperature while being circulated through the circulation passageway537. Then, the heated plating liquid M1is discharged from the plating liquid nozzle531. Further, the plating liquid M1may be further heated or temperature-controlled in a supply passageway534. A discharge temperature of the plating liquid M1is in the range from 55° C. to 75° C. and, more desirably, in the range from 60° C. to 70° C.

The plating liquid nozzle531is connected to a nozzle moving mechanism54. The nozzle moving mechanism54is configured to drive the plating liquid nozzle531. The nozzle moving mechanism54includes an arm541, a moving body542which is configured to be movable along the arm541and has a driving mechanism embedded therein; and a rotating/elevating mechanism543configured to rotate and move the arm541up and down. The plating liquid nozzle531is provided at the moving body542. The nozzle moving mechanism54is capable of moving the plating liquid nozzle531between a position above a center of the substrate W held by the substrate holding unit52and a position above a periphery of the substrate W, and is also capable of moving the nozzle531up to a stand-by position outside a cup57to be described later when viewed from the top.

The solvent supply unit55aincludes a solvent nozzle551aconfigured to discharge a solvent N1onto the substrate W held by the substrate holding unit52; and a solvent supply source552aconfigured to supply the solvent N1to the solvent nozzle551a. The solvent N1is stored in a tank of the solvent supply source552a, and the solvent N1is supplied to the solvent nozzle551afrom the solvent supply source552athrough a supply passageway554awhich is provided with a flow rate controller such as a valve553a.

The solvent N1contains one of solvents constituting the plating liquid M1. As an example of this solvent N1, a liquid such as water, a solvent having an adjusted pH or a surfactant-mixed liquid or a gas such as vapor may be used. Further, it is desirable that the solvent N1does not contain a plating component constituting the plating liquid M1such as CoWB, CoB, CoWP, CoWBP, NiWB, NiB, NiWP or NiWBP.

A circulation passageway558provided with a pump556and a heating unit557is connected to the tank of the solvent supply source552a. The solvent N1in the tank is heated or controlled to have a preset temperature while being circulated through the circulation passageway558. Then, the heated solvent N1is discharged from the solvent nozzle551a. Further, the solvent N1may be further heated or temperature-controlled in a supply passageway554a. A discharge temperature of the solvent N1is higher than the discharge temperature of the plating liquid. Specifically, the discharge temperature of the solvent N1is in the range from 75° C. to 90° C. and, more desirably, in the range from 80° C. to 90° C.

In the present exemplary embodiment, the solvent nozzle551ais mounted to the moving body542along with the plating liquid nozzle531. Accordingly, the plating liquid nozzle531and the solvent nozzle551aare configured to be movable above the substrate W as one body. That is, the nozzle moving mechanism54is capable of moving the plating liquid nozzle531and the solvent nozzle551ato a certain position between the position above the center of the substrate W and the position above the periphery portion of the substrate W.

The above-described plating liquid supply unit53and the solvent supply unit55aconstitute a liquid supply unit50.

The plating device5is further equipped with a cleaning liquid supply unit55band a rinse liquid supply unit55cconfigured to supply a cleaning liquid N2and a rinse liquid N3onto the substrate W held by the substrate holding unit52, respectively.

The cleaning liquid supply unit55bincludes a nozzle551bconfigured to discharge the cleaning liquid N2onto the substrate W held by the substrate holding unit52; and a cleaning liquid supply source552bconfigured to supply the cleaning liquid N2to the nozzle551b. The cleaning liquid N2is stored in a tank of the cleaning liquid supply source552b, and the cleaning liquid N2is supplied to the nozzle551bfrom the cleaning liquid supply source552bthrough a supply passageway554bwhich is provided with a flow rate controller such as a valve553b.

As an example of the cleaning liquid N2, 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 W may be used.

The rinse liquid supply unit55cincludes a nozzle551cconfigured to discharge the rinse liquid N3onto the substrate W held by the substrate holding unit52; and a rinse liquid supply source552cconfigured to supply the rinse liquid N3to the nozzle551c. The rinse liquid N3is stored in a tank of the rinse liquid supply source552c, and the rinse liquid N3is supplied to the nozzle551cfrom the rinse liquid supply source552cthrough a supply passageway554cwhich is provided with a flow rate controller such as a valve553c.

As an example of the rinse liquid N3, pure water may be used.

The plating device5includes a nozzle moving mechanism56configured to move the nozzles551band551c. The nozzle moving mechanism56is equipped with an arm561; a moving body562which is configured to be movable along the arm561and has a moving mechanism embedded therein; and a rotating/elevating mechanism563configured to rotate and move the arm561up and down. The nozzles551band551care provided at the moving body562. The nozzle moving mechanism56is capable of moving the nozzles551band551cbetween a position above the central portion of the substrate W held by the substrate holding unit52and a position above the peripheral portion of the substrate W, and also capable of moving the nozzles551band551cup to a stand-by position outside the cup57to be described later when viewed from the top. In the present exemplary embodiment, though the nozzles551band551care held by the common arm, they may be configured to be held by different arms and moved independently.

The cup57is disposed around the substrate holding unit52. The cup57is configured to receive various kinds of processing liquids (e.g., the plating liquid, the cleaning liquid, the rinse liquid, etc.) scattered from the substrate W and drain the received processing liquids to the outside of the chamber51. The cup51is equipped with an elevating mechanism58configured to move the cup57up and down.

Now, a plating method performed by the plating apparatus1will be explained. The plating method performed by the plating apparatus1includes a plating processing upon a substrate W. The plating processing is performed by the plating device5. An operation of the plating device5to be described below is controlled by the controller3.

First, the substrate W is carried into the plating device5and is held by the substrate holding unit52(seeFIG. 2). In the meanwhile, the controller3controls the elevating mechanism58to move the cup57down to a preset position. Then, the controller3controls the transfer device222to place the substrate W on the substrate holding unit52. The substrate W is horizontally placed on the turntable522while its periphery portion is held by the chuck523.

Then, the substrate W held by the substrate holding unit52is cleaned. At this time, while controlling the driving unit524to rotate the substrate W held by the substrate holding unit52at a preset speed, the controller3controls the cleaning liquid supply unit55bto locate the nozzle551bat a position above the substrate W and to supply a cleaning liquid N2onto the substrate W from the nozzle551b. The cleaning liquid N2supplied 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 N2scattered from the substrate W is drained through the cup57.

Subsequently, the substrate W after being cleaned is rinsed. At this time, while controlling the driving unit524to rotate the substrate W held by the substrate holding unit52at a preset speed, the controller3controls the rinse liquid supply unit55cto locate the nozzle551cat a position above the substrate W, and to supply a rinse liquid N3onto the substrate W from the nozzle551c. The rinse liquid N3supplied 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, the cleaning liquid N2remaining on the substrate W is washed away. The rinse liquid N3scattered from the substrate W is drained through the cup57.

Further, a catalyst imparting processing may be performed on the substrate W after being rinsed by a non-illustrated catalyst supply unit after the rinsing processing.

Subsequently, a plating processing is performed on the substrate W. The plating processing includes a plating liquid replacement processing, a plating liquid accumulation processing and a plating liquid processing. Here, while controlling the driving unit524to rotate the substrate W held by the substrate holding unit52at a preset speed (e.g., 100 rpm to 300 rpm), the controller3controls the plating liquid supply unit53to locate the plating liquid nozzle531at a position above a central portion of the substrate W and to supply a plating liquid M1to the substrate W from the plating liquid nozzle531(seeFIG. 3A). Accordingly, the rinse liquid N3on the surface of the substrate W is rapidly replaced with the plating liquid M1.

Upon the completion of the plating liquid replacement processing, the controller3reduces the rotational speed of the substrate W held by the substrate holding unit52(e.g., to 50 rpm to 150 rpm) and starts the plating liquid accumulation processing by controlling the plating liquid supply unit53. During the plating liquid accumulation processing, the plating liquid M1is supplied onto the substrate W from the plating liquid supply unit53, and a solvent N1having a temperature different from that of the plating liquid M1is supplied onto the substrate W from the solvent supply unit55aat a preset timing as will be described later (liquid supplying process). Hereinafter, this liquid supplying process will be elaborated.

First, while supplying the plating liquid M1toward the substrate W from the plating liquid nozzle531, the plating liquid nozzle531is moved from a central portion side of the substrate W toward a peripheral portion side thereof (first moving process) (seeFIG. 3B). At this time, the solvent nozzle551ais also moved as one body with the plating liquid nozzle531, but the supply of the solvent N1from the solvent nozzle551ais stopped. Accordingly, the central portion of the substrate W is heated by heat from the plating liquid M1. The temperature of the plating liquid M1is in the range from, for example, 55° C. to 75° C., and, more desirably, from 60° C. to 70° C.

Subsequently, when the plating liquid nozzle531reaches a certain position from the position above the central portion side of the substrate W to a position above the peripheral portion side of the substrate W, the solvent supply unit55ais controlled, and the supply of the solvent N1from the solvent nozzle551ais begun. In this state, the plating liquid nozzle531and the solvent supply unit55aare further moved toward the position above the peripheral portion side of the substrate W (second moving process) (seeFIG. 3C). In the meantime, the plating liquid nozzle531continues to supply the plating liquid M1, the plating liquid M1and the solvent N1are mixed on the surface of the substrate W. As stated above, the temperature of the solvent N1is higher than the temperature of the plating liquid M1. For example, the temperature of the solvent N1is in the range from, e.g., 75° C. to 95° C., and, more desirably, 80° C. to 90° C. Therefore, the temperature of the mixed liquid of the plating liquid M1and the solvent N1is higher than the temperature of the plating liquid M1. Thus, a region of the peripheral portion side of the substrate W is heated more strongly than a region of the central portion side of the substrate W by the heat of the mixed liquid of the plating liquid M1and the solvent N1.

Furthermore, a flow rate ratio between the plating liquid M1and the solvent N1is in the range from, e.g., 90:10 to 50:50. Further, a total flow rate of the plating liquid M1and the solvent N1is maintained at a constant value. Alternatively, while maintaining the flow rate of the plating liquid M1constant, the flow rate of the solvent N1may be varied. Still alternatively, the flow rates of the plating liquid M1and the solvent N1may be varied during the plating liquid accumulation processing.

Subsequently, after the plating liquid nozzle531reaches the position above the peripheral portion side of the substrate W, the plating liquid nozzle531is returned from the position above the peripheral portion side of the substrate W toward the position above the central portion side thereof (third moving process) (seeFIG. 3D). At this time, the supply of the plating liquid M1from the plating liquid nozzle531and the supply of the solvent N1from the solvent nozzle551aare continued. Accordingly, the region of the peripheral portion side of the substrate W is kept heated by the heat from the mixed liquid of the plating liquid M1and the solvent N1.

Thereafter, when the plating liquid nozzle531reaches a certain position from the position above the peripheral portion side of the substrate W and the position above the central portion side thereof, the solvent supply unit55ais controlled, and the supply of the solvent N1from the solvent nozzle551ais stopped. In this state, the plating liquid nozzle531is further moved toward the position above the central portion side of the substrate W (fourth moving process) (seeFIG. 3E). In the meantime, since the plating liquid nozzle531continues to supply the plating liquid M1, the region of the central portion side of the substrate W is heated by the heat from the plating liquid M1. The degree of this heating is weak as compared to the degree of heating of the peripheral portion side of the substrate W.

As stated above, in the liquid supplying process, since the plating liquid M1and the solvent N1are supplied together for at least a certain time period, a preset position on the substrate W, specifically, a region (e.g., the peripheral portion side) of the substrate W intended to be heated can be intensively heated with the mixed liquid of the plating liquid M1and the solvent N1.

Further, afterwards, the plating liquid nozzle531and the solvent supply unit55amay be further moved between the position above the peripheral portion side of the substrate W and the position of the central portion side thereof, and the plating liquid accumulation processing may be continued.

Then, the controller3controls the plating liquid supply unit53to move the plating liquid nozzle531to a position above a location displaced from the center of the substrate W by, e.g., 30 mm to 100 mm, more desirably, by 30 mm to 70 mm in a radial direction. In this state, the plating liquid M1is supplied to the substrate W from the plating liquid nozzle531. Accordingly, the plating liquid is diffused on the entire surface of the substrate W, so that the plating liquid processing is performed.

After the plating processing including the above described series of processes is completed, the substrate W held by the substrate holding unit52is cleaned. At this time, while controlling the driving unit524to rotate the substrate W held by the substrate holding unit52at a preset speed, the controller3controls the cleaning liquid supply unit55bto locate the nozzle551bat the position above the substrate W and to supply the cleaning liquid N2onto the substrate W from the nozzle551b. The cleaning liquid N2supplied 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. Accordingly, the abnormal plating film or the reaction by-product adhering to the substrate W is removed from the substrate W. The cleaning liquid N2scattered from the substrate W is drained through the cup57.

Then, while controlling the driving unit524to rotate the substrate W held by the substrate holding unit52at a preset speed, the controller3controls the rinse liquid supply unit55cto locate the nozzle551cat the position above the substrate W and to supply the rinse liquid N3onto the substrate W from the nozzle551c. Accordingly, the plating liquid M1, the cleaning liquid N2and the rinse liquid N3on the substrate W are scattered from the substrate W by a centrifugal force which is caused by the rotation of the substrate W, and are drained through the cup57.

Thereafter, the substrate W is carried out of the plating device5. At this time, the controller3controls the transfer device222to take out the substrate W from the plating device5and place the taken-out substrate W in the delivery unit214. Then, the controller3controls the transfer device213to take out the substrate W placed on the delivery unit214and to carry the substrate W into the carrier C in the placing section211.

As stated above, according to the present exemplary embodiment, the plating liquid M1is supplied onto the substrate W from the plating liquid nozzle531, and, afterwards, the solvent N1having the higher temperature than the plating liquid M1is supplied to a preset position on the substrate W from the solvent nozzle551a(liquid supplying process). To elaborate, while the plating liquid nozzle531is being moved above the central portion side of the substrate W, only the plating liquid M1is supplied onto the substrate W. Meanwhile, while the plating liquid nozzle531is being moved in a region above the peripheral portion side of the substrate W, the solvent N1from the solvent nozzle551aas well as the plating liquid M1is supplied. Accordingly, since the peripheral portion side of the substrate W is heated more strongly than the central portion side thereof, it is possible to sufficiently increase the temperature of the peripheral portion side of the substrate W which otherwise is highly likely to have a relatively lower temperature than that of the central portion side of the substrate W, so that the temperature of the substrate W can be uniform within the surface of the substrate W. Accordingly, the thickness of the plating film can be uniform within the surface of the substrate W.

Furthermore, according to the present exemplary embodiment, since the solvent N1contained in the plating liquid M1is used as the fluid for heating the peripheral portion side of the substrate W, there is no influence upon the plating processing. Moreover, there is no concern that the consumption amount of the plating liquid M1is increased.

MODIFICATION EXAMPLES

Now, various modification examples of the present exemplary embodiment will be explained.

In the above described exemplary embodiment, there has been described an example case of setting the temperature of the solvent N1to be higher than the temperature of the plating liquid M1. However, the exemplary embodiment is not limited thereto. To the contrary, the temperature of the solvent N1may be set to be lower than the temperature of the plating liquid M1. In this cases, when the plating liquid nozzle531is moved above the central portion side of the substrate W, the solvent N1having a relatively low temperature may be supplied to the preset position of the substrate W (region of the central portion side of the substrate W) from the solvent nozzle551aalong with the plating liquid M1from the plating liquid nozzle531. Meanwhile, when the plating liquid nozzle531is moved above the peripheral portion side of the substrate W, only the plating liquid M1may be supplied to the substrate W. Accordingly, the temperature of the peripheral portion side of the substrate W, which otherwise may have a lower temperature, can be increased sufficiently, so that the temperature of the substrate W can be uniform within the entire surface of the substrate W.

Further, in the above-described exemplary embodiment, there has been described for an example case that, while the plating liquid nozzle531is being moved above the peripheral portion side of the substrate W, the plating liquid M1and the solvent N1are supplied together. However, the plating liquid M1and the solvent N1may not necessarily be supplied at the same time as long as the mixed liquid of the plating liquid M1and the solvent N1is generated on the substrate W. By way of example, only the plating liquid M1may be supplied to the substrate W from the plating liquid nozzle531, and, then, the supply of the plating liquid M1from the plating liquid nozzle531is stopped, and then, only the solvent N1may be supplied to the preset position of the substrate W from the solvent nozzle551a.

In addition, though, in the above-described exemplary embodiment, there has been described an example case where the plating liquid nozzle531and the solvent nozzle551aare arranged side by side as one body, the exemplary embodiment may not be limited thereto. By way of example, as depicted inFIG. 4toFIG. 9, the arrangement of the plating liquid nozzle531and the solvent nozzle551amay be different from the above-described exemplary embodiment. Below, modification examples of the arrangement of the plating liquid nozzle531and the solvent nozzle551amay be further explained.

As depicted inFIG. 4, the plating liquid nozzle531and the solvent nozzle551amay have a dual structure. In this example, the plating liquid nozzle531is located at the center, and the solvent nozzle551ais provided to surround the plating liquid nozzle531. When viewed from the top, the solvent nozzle551amay have an annular shape such as a circular shape, or a C-shape. InFIG. 4, as the solvent nozzle551ais disposed around the plating liquid nozzle531, the plating liquid M1and the solvent N1can be mixed more efficiently.

As illustrated inFIG. 5, instead of providing the solvent nozzle551a, the supply passageway554bof the solvent supply unit55amay be connected to a portion of the pipeline (supply passageway534) of the plating liquid nozzle531. In this case, the solvent N1from the solvent supply unit55ais mixed with the plating liquid M1within the supply passageway534and is supplied from the plating liquid nozzle531. In this case, the plating liquid M1and the solvent N1can be mixed more efficiently.

As shown inFIG. 6, the plating liquid nozzle531and the solvent nozzle551amay be provided to be inclined with respect to the surface of the substrate W. In this case, when viewed from the side, the plating liquid nozzle531and the solvent nozzle551amay be inclined in different directions. Accordingly, agitation of the plating liquid M1and the solvent N1on the substrate W which is being rotated can be facilitated, so that it is possible to promote the mixing of the plating liquid M1and the solvent N1. Furthermore, inclination angles of the plating liquid nozzle531and the solvent nozzle551acan be appropriately adjusted.

As depicted inFIG. 7, the plating liquid nozzle531and the solvent nozzle551amay be mounted to separate arms541and541and separate moving bodies542and542, and configured to be movable above the substrate W separately. Accordingly, the position of the plating liquid nozzle531and the position of the solvent nozzle551acan be controlled independently. Thus, regardless of the position of the plating liquid nozzle531, an appropriate amount of the solvent N1can be supplied to an appropriate position on the substrate W from the solvent nozzle551a.

As illustrated inFIG. 8, the solvent nozzle551amay be located at a fixed position above the substrate W. Particularly, by fixing the solvent nozzle551aat a position above the peripheral portion of the substrate W, the temperature of the peripheral portion of the substrate W can be efficiently increased. Here, the expression that “the solvent nozzle551ais located at the fixed position above the substrate W” implies that the solvent nozzle551ais not moved and fixed at the fixed position when the solvent nozzle551ais placed above the substrate W. Further, the solvent nozzle551amay be configured to be movable to a stand-by position outside the cup57, for example.

As depicted inFIG. 9, at least one of the plating liquid nozzle531and the solvent nozzle551amay be provided in two or more. By way of example, inFIG. 9, two plating liquid nozzles531A and531B are provided, and one solvent nozzle551ais provided. The plating liquid nozzles531A and531B and the solvent nozzle551aare formed as one body. The plating liquid nozzles531A and531B may be configured to discharge the plating liquid M1(same component) at different flow rates. Accordingly, responsiveness to the discharge of the plating liquid M1from the plating liquid nozzles531A and531B is increased, and the flow rate of the plating liquid M1can be stabilized.

The above-described exemplary embodiments are not limiting, and various changes and modifications may be made to the constituent components without departing from the scope of the present disclosure. Further, various inventions may be conceived by combining multiple constituent components appropriately. Some of the constituent components disclosed in the present exemplary embodiments can be omitted, and constituent components from the different exemplary embodiments may be appropriately combined.