WO2022149257A1 - 基板ホルダ、めっき装置、めっき方法、及び記憶媒体 - Google Patents
基板ホルダ、めっき装置、めっき方法、及び記憶媒体 Download PDFInfo
- Publication number
- WO2022149257A1 WO2022149257A1 PCT/JP2021/000460 JP2021000460W WO2022149257A1 WO 2022149257 A1 WO2022149257 A1 WO 2022149257A1 JP 2021000460 W JP2021000460 W JP 2021000460W WO 2022149257 A1 WO2022149257 A1 WO 2022149257A1
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- WIPO (PCT)
- Prior art keywords
- internal space
- substrate
- plating
- liquid
- substrate holder
- Prior art date
Links
- 239000000758 substrate Substances 0.000 title claims abstract description 233
- 238000007747 plating Methods 0.000 title claims abstract description 229
- 238000000034 method Methods 0.000 title claims description 10
- 239000007788 liquid Substances 0.000 claims abstract description 92
- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 76
- 239000011261 inert gas Substances 0.000 claims description 12
- 230000006870 function Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 description 99
- 239000010949 copper Substances 0.000 description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 15
- 239000001301 oxygen Substances 0.000 description 15
- 238000004140 cleaning Methods 0.000 description 12
- 238000001514 detection method Methods 0.000 description 11
- 238000004090 dissolution Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 10
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- 238000012546 transfer Methods 0.000 description 10
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- 230000007423 decrease Effects 0.000 description 7
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000006837 decompression Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
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- 229910020836 Sn-Ag Inorganic materials 0.000 description 1
- 229910020988 Sn—Ag Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 229910000457 iridium oxide Inorganic materials 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 238000002844 melting Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000008239 natural water Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
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- 239000008213 purified water Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
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- 239000008399 tap water Substances 0.000 description 1
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- 230000032258 transport Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/06—Suspending or supporting devices for articles to be coated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/001—Apparatus specially adapted for electrolytic coating of wafers, e.g. semiconductors or solar cells
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/004—Sealing devices
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/06—Suspending or supporting devices for articles to be coated
- C25D17/08—Supporting racks, i.e. not for suspending
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/12—Semiconductors
- C25D7/123—Semiconductors first coated with a seed layer or a conductive layer
Definitions
- the present application relates to a substrate holder, a plating apparatus, a plating method, and a storage medium for storing a program for causing a computer to execute a control method of the plating apparatus.
- Patent Document 1 In US Pat. No. 7,727,366 (Patent Document 1) and US Pat. No. 8,168,057 (Patent Document 2), one side of the seal of the substrate is pressurized with a fluid to prevent the intrusion of fluid from the other side of the seal. It is stated that it should be done.
- JP-A-2020-117763 Patent Document 3
- JP-A-2020-117765 Patent Document 4
- a liquid is injected into the internal space that seals and accommodates the outer peripheral portion of the substrate, and the liquid is injected into the internal space. It is described that the precipitation of plating on the outer peripheral portion of the substrate and the contact member is prevented by preventing the intrusion of the plating solution.
- the plating solution may invade the internal space depending on the unevenness of the substrate and the degree of deterioration of the seal. There is no description of effective countermeasures when the sword invades the internal space.
- One of the objects of the present invention is to detect or prevent the plating solution from entering the sealed space of the substrate holder at an early stage. Further, one of the objects of the present invention is to prevent the uniformity of the plating film thickness from being lowered even when the plating solution invades the sealed space of the substrate holder.
- a substrate holder for holding a substrate and bringing the substrate into contact with a plating solution for plating, and in a state where the substrate is held by the substrate holder, the outer peripheral portion of the substrate is described.
- An internal space that is sealed from the outside of the substrate holder, a first passage that connects the outside of the substrate holder and the internal space, and introduces a liquid into the internal space, and a first passage that is arranged in the internal space and described above.
- a detector for detecting the leakage of the plating solution into the internal space by monitoring the current flowing through the liquid or the electric resistance of the liquid during plating.
- a board holder is provided.
- the substrate holder is arranged in the internal space, and is in contact with a seed layer formed on the surface of the substrate to allow a plating current to flow through the substrate, and a high potential side with respect to the contact. It can be equipped with a soluble electrode that is biased towards.
- the "board” is not only a semiconductor substrate, a glass substrate, a liquid crystal substrate, and a printed circuit board, but also a magnetic recording medium, a magnetic recording sensor, a mirror, an optical element, a micromechanical element, or a partially manufactured element. Includes integrated circuits and any other object to be processed.
- the substrate includes any shape including polygons and circles. Further, in this specification, expressions such as “front”, “rear”, “front”, “back”, “top”, “bottom”, “left”, and “right” are used, but these are for convenience of explanation. The above shows the position and direction of the illustrated drawings on the paper, and may differ from the actual arrangement when the device is used.
- FIG. 1 is an overall layout of the plating apparatus according to the embodiment.
- the plating apparatus 100 performs a plating process on a substrate while holding the substrate in the substrate holder 200 (FIG. 2).
- the plating apparatus 100 is roughly divided into a load / unload station 110 for loading the substrate into the substrate holder 200 or unloading the substrate from the substrate holder 200, a processing station 120 for processing the substrate, and a cleaning station 50a.
- a pretreatment / posttreatment module 120A for performing pretreatment and posttreatment of the substrate and a plating module 120B for performing plating treatment on the substrate are arranged.
- the load / unload station 110 has one or more cassette tables 25 and a board attachment / detachment module 29.
- the cassette table 25 mounts a cassette 25a containing a substrate.
- the board attachment / detachment module 29 is configured to attach / detach the board to / from the board holder 200.
- a stocker 30 for accommodating the substrate holder 200 is provided in the vicinity (for example, below) of the substrate attachment / detachment module 29.
- the cleaning station 50a has a cleaning module 50 that cleans and dries the substrate after the plating treatment.
- the cleaning module 50 is, for example, a spin rinse dryer.
- a transfer robot 27 that transfers the board between these units is arranged.
- the transfer robot 27 is configured to be able to travel by the traveling mechanism 28.
- the transfer robot 27 takes out the substrate before plating from the cassette 25a and conveys it to the substrate attachment / detachment module 29, receives the substrate after plating from the substrate attachment / detachment module 29, and conveys the substrate after plating to the cleaning module 50 for cleaning.
- the dried substrate is taken out from the cleaning module 50 and stored in the cassette 25a.
- the pre-treatment / post-treatment module 120A includes a pre-wet module 32, a pre-soak module 33, a first rinse module 34, a blow module 35, and a second rinse module 36.
- the pre-wet module 32 replaces the air inside the pattern formed on the surface of the substrate with the treatment liquid by wetting the surface to be plated of the substrate before the plating treatment with a treatment liquid such as pure water or degassed water.
- the pre-wet module 32 is configured to perform a pre-wet treatment that facilitates supply of the plating liquid to the inside of the pattern by replacing the treatment liquid inside the pattern with the plating liquid at the time of plating.
- the pre-soak module 33 cleans the surface of the plating base by, for example, etching and removing an oxide film having a large electric resistance existing on the surface of the seed layer formed on the surface to be plated of the substrate before the plating treatment with a treatment liquid such as sulfuric acid or hydrochloric acid. Alternatively, it is configured to be subjected to a pre-soak treatment that activates it.
- the substrate after presoaking is washed with a cleaning liquid (pure water or the like) together with the substrate holder 200.
- the blow module 35 the liquid of the substrate is drained after cleaning.
- the plated substrate is washed with a cleaning liquid together with the substrate holder 200.
- the pre-wet module 32, the pre-soak module 33, the first rinse module 34, the blow module 35, and the second rinse module 36 are arranged in this order. It should be noted that this configuration is an example and is not limited to the configuration described above, and the pre-processing / post-processing module 120A can adopt another configuration.
- the plating module 120B has a plurality of plating tanks (plating cells) 39 and an overflow tank 38.
- Each plating tank 39 houses one substrate inside, and the substrate is immersed in the plating solution held inside to perform plating such as copper plating on the surface of the substrate.
- the type of plating solution is not particularly limited, and various plating solutions are used depending on the intended use.
- the configuration of the plating module 120B is an example, and other configurations can be adopted for the plating module 120B.
- the plating device 100 is located on the side of each of these devices, and has a transfer device 37 that transports the substrate holder 200 together with the substrate between these devices, for example, by adopting a linear motor system.
- the transfer device 37 is a substrate holder between the substrate attachment / detachment module 29, the stocker 30, the pre-wet module 32, the pre-soak module 33, the first rinse module 34, the blow module 35, the second rinse module 36, and the plating module 120B. It is configured to carry 200.
- the plating apparatus 100 configured as described above has a control module (controller) 175 as a control unit configured to control each of the above-mentioned units.
- the controller 175 has a memory 175B for storing a predetermined program and a CPU 175A for executing the program of the memory 175B.
- the storage medium constituting the memory 175B stores various setting data, various programs including a program for controlling the plating apparatus 100, and the like.
- the program includes, for example, transfer control of the transfer robot 27, control of attaching / detaching the substrate to / from the substrate holder 200 in the substrate attachment / detachment module 29, transfer control of the transfer device 37, control of processing in each processing module, and plating processing in each plating tank 39.
- the storage medium can include non-volatile and / or volatile storage media.
- a memory such as a computer-readable ROM, RAM, or flash memory, or a known storage medium such as a hard disk, a CD-ROM, a DVD-ROM, or a disk-shaped storage medium such as a flexible disk can be used. ..
- the controller 175 is configured to be communicable with a higher-level controller (not shown) that controls the plating device 100 and other related devices in an integrated manner, and can exchange data with a database owned by the higher-level controller. Some or all the functions of the controller 175 can be configured by hardware such as ASIC. Some or all the functions of the controller 175 may be configured by a sequencer. A part or all of the controller 175 can be arranged inside and / or outside the housing of the plating apparatus 100. A part or all of the controller 175 is communicably connected to each part of the plating apparatus 100 by wire and / or wirelessly.
- FIG. 2 is a schematic view showing the plating module 120B.
- the plating module 120B has a plating tank 39 that holds a plating solution inside, an anode 40 that is arranged in the plating tank 39 so as to face the substrate holder 200, and an anode holder that holds the anode 40. It is equipped with 60.
- the substrate holder 200 is configured to hold the substrate W such as a wafer detachably and to immerse the substrate W in the plating solution Q in the plating tank 39.
- the plating apparatus 100 according to the present embodiment is an electrolytic plating apparatus for plating the surface of the substrate W with metal by passing an electric current through the plating solution Q.
- an insoluble anode made of titanium coated with, for example, iridium oxide or platinum, which is insoluble in the plating solution is used.
- a soluble anode may be used.
- a soluble anode made of phosphorus-containing copper can be used.
- the substrate W is, for example, a semiconductor substrate, a glass substrate, a resin substrate, or any other object to be processed.
- the metal plated on the surface of the substrate W is, for example, copper (Cu), nickel (Ni), tin (Sn), Sn—Ag alloy, or cobalt (Co).
- the plating solution Q is an acidic solution containing a metal to be plated, and is, for example, a copper sulfate solution when plating copper.
- the anode 40 and the substrate W are arranged so as to extend in the vertical direction and are arranged so as to face each other in the plating solution.
- a configuration (cup type) in which the anode 40 and the substrate W are arranged so as to extend in the horizontal direction can be adopted.
- the anode 40 is connected to the positive electrode of the power supply 90 via the anode holder 60, and the substrate W is connected to the negative electrode of the power supply 90 via the substrate holder 200.
- a voltage is applied between the anode 40 and the substrate W, a current flows through the substrate W and a metal film is formed on the surface of the substrate W in the presence of the plating solution.
- the plating module 120B further includes an overflow tank 38 adjacent to the plating tank 39.
- the plating solution in the plating tank 39 overflows the side wall of the plating tank 39 and flows into the overflow tank 38.
- One end of the plating solution circulation line 58a is connected to the bottom of the overflow tank 38, and the other end of the circulation line 58a is connected to the bottom of the plating tank 39.
- a circulation pump 58b, a constant temperature unit 58c, and a filter 58d are attached to the circulation line 58a.
- the plating solution Q overflows the side wall of the plating tank 39, flows into the overflow tank 38, and is further returned from the overflow tank 38 to the plating tank 39 through the circulation line 58a. In this way, the plating solution Q circulates between the plating tank 39 and the overflow tank 38 through the circulation line 58a.
- the plating apparatus 100 further includes an adjusting plate (regulation plate) 14 for adjusting the potential distribution on the substrate W, and a paddle 16 for stirring the plating solution in the plating tank 39.
- the adjusting plate 14 is arranged between the paddle 16 and the anode 40, and has an opening 14a for limiting the electric field in the plating solution.
- the paddle 16 is arranged near the surface of the substrate W held by the substrate holder 200 in the plating tank 39.
- the paddle 16 is made of, for example, titanium (Ti) or a resin.
- the paddle 16 reciprocates in parallel with the surface of the substrate W to agitate the plating solution Q so that sufficient metal ions are uniformly supplied to the surface of the substrate W during plating of the substrate W.
- the above-mentioned configuration is an example, and other configurations can be adopted for the configurations of the plating apparatus 100, the plating module 120B, and the like.
- FIG. 3 is a schematic view of the front plate of the board holder as viewed from the inside.
- FIG. 4 is a schematic view of the back plate of the substrate holder as viewed from the inside.
- the substrate holder 200 includes a front plate 210 and a back plate 220, and holds the substrate W by sandwiching the substrate W between the front plate 210 and the back plate 220.
- the front plate 210 includes a holding body 211, a plurality of contacts 213, a bus bar 214, and a clamp mechanism 217.
- the plurality of contacts 213, the bus bar 214, and the clamp mechanism 217 are provided on the inner surface of the holding body 211.
- the holding body 211 has an opening 211A that exposes the surface to be plated of the substrate W.
- a handle 212 is attached to one end side of the holding body 211.
- the plurality of contacts 213 are provided along the outer circumference of the opening 211A.
- the contact 213 is an electric contact for contacting the seed layer of the substrate W and allowing a plating current to flow through the substrate.
- the bus bar 214 electrically connects the contact 213 and the external connection terminal 218 provided on the handle 212.
- the bus bar 214 is wiring for connecting the contact 213 to the power supply 90 via the external connection terminal 218. Inside the contact 213 around the opening 211A, an inner seal 215 that comes into contact with the substrate W and seals between the substrate W and the substrate holder 200 is provided. Further, on the outside of the bus bar 214, an outer seal 216 that comes into contact with the back plate 220 and seals the substrate holder 200 is provided. The clamp mechanism 217 is provided on the outside of the outer seal 216 and cooperates with the clamp mechanism 227 of the back plate 220 to engage the front plate 210 and the back plate 220 with each other.
- the back plate 220 includes a holding body 221 and a clamp mechanism 227 provided on the outer peripheral portion of the holding body 221.
- the retainer 221 has an opening 221A. However, the opening 221A may be omitted as shown in FIG.
- a handle 222 is attached to one end side of the holding body 221. The handle 222 engages with the handle 212 of the front plate 210 and functions as an integral handle. Both ends of this handle are hung on the edge of the wall of the processing tank of each module, and the substrate holder 200 is suspended and installed.
- the holding body 221 is provided with an inner seal 225 at a position corresponding to the inner seal 215 of the front plate 210.
- the position on the holder 221 corresponding to the outer seal 216 of the front plate 210 is indicated by a broken line.
- the inner seals 215 and 225 and the outer seals 216 form a sealed internal space (seal space) 240 (seal space) 240 (FIGS. 3, 4 and 4) of the substrate holder 200. 6A, 6B) are formed.
- the internal space 240 corresponds to the portion between the inner seal 215 and the outer seal 216 in FIG. 3 and corresponds to the portion between the inner seal 225 and the dashed line in FIG.
- a detector 230 for detecting a leak of the plating solution is provided between the inner seal 215 and the outer seal 216 of the front plate 210.
- the detector 230 is a conductor or electrode provided in the vicinity of the plurality of contacts 213.
- the conductor or electrode may be one piece or may be composed of a plurality of pieces.
- the detector 230 is connected to the external connection terminal 219 by the wiring shown by the dotted line.
- the external connection terminal 219 is electrically isolated from the external connection terminal 218.
- the back plate 220 is provided with an introduction passage 231 and a discharge passage 232 for connecting the internal space 240 of the substrate holder 200 and the outside of the substrate holder 200.
- the introduction passage 231 and the discharge passage 232 are provided with a valve 231A and a valve 232A for controlling conduction and disconnection of the respective passages, respectively.
- the valve 231A and the valve 232A can be, for example, a solenoid valve, and may be an on-off valve or a flow rate control valve capable of controlling the flow rate.
- the valve 231A and the valve 232A are controlled by the controller 175.
- the valve 231A and the valve 232A can be provided inside or on the surface of the holding body 220 of the substrate holder 400.
- a part or all of the introduction passage 231 and the discharge passage 232 can be provided as a passage formed inside the holding body 220 of the substrate holder 400 and / or as a pipe arranged on the surface of the holding body 220.
- FIG. 5 is a schematic view of the board holder in the pre-wet module.
- the pre-wet module 300 includes a processing tank 301, a circulation line 302, and a pump 303 and a degassing module 304 provided in the circulation line 302.
- the degassing module 304 is a device that removes (degasses) the air in the liquid or replaces it with an inert gas.
- FIG. 5 shows an example in which the degassing module is depressurized by a vacuum pump to remove air in the liquid.
- the inert gas is passed through the degassing module instead of the depressurization of the vacuum pump, the air in the liquid can be replaced with the inert gas.
- pure water for example, DIW
- the treatment tank 301 is configured to store pure water degassed or replaced with an inert gas by the degassing module 304.
- the pure water in the treatment tank 301 is sent to the degassing module 304 by the pump 303, and after being degassed or replaced with an inert gas by the degassing module 304, is circulated so as to be returned to the treatment tank 301, and is circulated so as to be returned to the treatment tank 301.
- Degassed water can be stored inside.
- the degassed water means water from which air has been removed or water in which the gas in the water is replaced with an inert gas.
- the treatment tank 301 is provided with a supply port and a discharge port (not shown), and the pure water in the treatment tank 301 is appropriately replaced by the supply port and the discharge port. Reduce the dissolved oxygen concentration in pure water by degassing, replacing with an inert gas, etc.
- the substrate holder 200 holding the substrate W is immersed in pure water (degassed water) in the processing tank 301, the valve 231A of the introduction passage 231 is opened, and the pure water is introduced through the introduction passage 231. It is introduced into the internal space 240 of the substrate holder 200, and the internal space 240 is filled with pure water.
- the substrate holder 200 holding the substrate W is immersed in pure water in the processing tank 301, the valves 231A and 232A are opened, and the pure water is introduced into the internal space 240 of the substrate holder 200 via the introduction passage 231.
- the internal space 240 is filled with pure water. good.
- the valve 231A and / or the valve 232A may be opened before the substrate holder 200 is immersed in pure water. After the internal space 240 is filled with pure water, the valve 231A and the valve 232A are closed.
- the internal space 240 is preferably completely filled with pure water so that no air remains, but when it is permissible for some air or air bubbles to remain depending on the desired degree of action and effect described later. There is. Hereinafter, the present embodiment will be described assuming that the internal space 240 is completely filled with pure water.
- a decompression device for example, a vacuum pump
- a vacuum pump for example, a vacuum pump
- the other passage is shut off and the valve 231A is opened. Pure water may be introduced into the internal space 240.
- the valve 232A may be opened so that the internal space 240 is more reliably filled with pure water.
- a decompression device is connected to the discharge passage 232, and after depressurizing the inside of the internal space 240, the valve 232A is closed and the 231A is opened so that pure water is introduced into the internal space 240. You may.
- valves 231A and 232A may be opened again to discharge the pure water in the internal space 240 of the substrate holder 200. ..
- FIG. 6A and 6B are schematic views of an enlarged cross section of the internal space of the substrate holder in the plating tank.
- FIG. 6C is an enlarged schematic view of a cross section of the internal space of the substrate holder according to the comparative example in the plating tank.
- the internal space 240A is hollow and air is present. Since the internal space 240A is hollow, once a leak occurs in which the plating solution Q invades the internal space 240A, the air in the internal space 240A is compressed by the hydraulic pressure of the plating solution Q, and a large amount of the plating solution Q is inside the seal. May invade.
- the seed layer 401 may be dissolved and electrically insulated due to electrolytic corrosion due to the diversion of dissolved oxygen and / or the plating current in the plating solution.
- FIG. 7 is an explanatory diagram illustrating the dissolution of the seed layer by the dissolved oxygen concentration.
- the plating solution Q invades the air-filled internal space 240A (FIG. 6C)
- the undiluted solution of the plating solution Q adheres to the exposed seed layer 401 near the contact 213 without being diluted.
- the air (O 2 ) in the internal space 240A compressed by the intrusion of the plating solution Q dissolves in the plating solution Q, a concentration gradient of O 2 is generated near the gas-liquid interface, and the seed layer is formed by the action of the local battery. 401 dissolves. Specifically, as shown in FIG.
- FIG. 8A is an explanatory diagram illustrating the dissolution of the seed layer by the shunt current.
- FIG. 8B is an equivalent circuit diagram illustrating the shunt current.
- I total is the total current flowing through the contact
- I cw is the current flowing through the contact point between the seed layer and the contact
- I shunt is the shunt current.
- R contact is the contact resistance between the contact 213 and the seed layer 401
- R wafer is the electrical resistance of the seed layer
- R dissolution is the electrical resistance at the melting point on the seed layer side of the shunt current path.
- Deposition is the electrical resistance at the point of precipitation on the contact side of the shunt current path
- Relectorlite is the electrical resistance of the plating solution.
- a short-circuit current (shunt current) I shunt that flows from the seed layer 401 to the contact 213 via the plating solution Q is generated by the redox reaction on the surface of the seed layer 401 and the surface of the contact 213. As shown in FIG. 8A, this shunt current flows when Cu becomes Cu 2+ on the surface of the seed layer 401 and dissolves in the plating solution Q, and Cu 2+ in the plating solution Q becomes Cu on the surface of the contact 213. ..
- the seed layer 401 when the plating solution Q invades the internal space 240A, the seed layer 401 is dissolved due to the local battery action due to the dissolved oxygen concentration gradient described above and / or the shunt current.
- the seed layer 401 may be electrically insulated.
- the internal space 240 of the substrate holder 200 is filled with pure water (for example, DIW) (FIGS. 5, 6A and 6B), and the plating solution in the internal space 240 of the substrate holder 200 is adopted.
- a detector 230 for detecting the leak of the above is provided (FIGS. 3, FIG. 6A, FIG. 6B).
- the detector 230 is, for example, an electrode that detects a current flowing between the contact 213 or the bus bar 214 via pure water in the internal space 240, that is, a current flowing through pure water in the internal space 240 (or electricity of pure water). It can be an electrode for detecting resistance).
- a soluble electrode 235A which functions as a sacrificial anode or a sacrificial electrode, is adopted as the detector 230.
- reference numeral 401 indicates a seed layer formed on the surface of the substrate W
- reference numeral 402 indicates a resist pattern formed on the surface of the seed layer 401.
- Metal is electroplated on the seed layer 401 exposed from the openings of the resist pattern.
- the contact 213 of the substrate holder 200 is in contact with the seed layer 401 and is electrically conductive with the seed layer 401.
- soluble electrode a conductor made of the same material as the plated metal can be used, and for example, an electrode made of phosphorus-containing copper can be used as in the case of the soluble anode.
- a DC voltage is applied between the electrode 235A and the contact 213 (bus bar 214) by the DC power supply device 236A so that the electrode 235A has a higher potential than the contact 213 (bus bar 214).
- a current detector 237A is provided in the DC power supply device 236A or on the wiring from the DC power supply device 236A. In this state, the controller 175 monitors the current flowing between the electrode 235A and the contact 213 (bus bar 214) or the electrical resistance between them.
- the current flowing between the electrode 235A and the contact 213 corresponds to the current flowing through the pure water in the internal space 240.
- the electrical resistance between the electrode 235A and the contact 213 corresponds to the electrical resistance of pure water in the internal space 240.
- the application of DC voltage to the electrode 235A and the detection of current (electrical resistance) are controlled by the controller 175.
- the controller 175 acquires a current flowing through the electrode 235A (current flowing through pure water in the internal space 240) via the current detector 237A, and detects a leakage of the plating solution to the internal space 240 based on this current. Further, the controller 175 acquires the current flowing through the electrode 235A, calculates the electric resistance value of pure water from the voltage between the electrode 235A and the contact 213 (bus bar 214), and the detected current, and calculates the electric resistance value. Detect leaks based on.
- the electric resistance of the pure water in the internal space 240 is extremely high, so that no current flows between the electrode 235A and the contact 213 (bus bar 214) (or very little). Only a weak current flows).
- the plating solution is mixed with the pure water, the electric resistance of the pure water decreases, and a current flows (or the current increases) between the electrode 235A and the contact 213 (bus bar 214). In this way, the electrode 235A can detect the leakage of the plating solution into the internal space 240.
- the electrode 235A that functions as a sacrificial anode is biased to a high potential with respect to the contact 213 and the seed layer 401.
- the electrode (sacrificial anode) 235A preferentially dissolves, and the dissolution of the seed layer 401 is suppressed or prevented.
- the internal space 240 of the substrate holder 200 is filled with pure water, the pressure difference between the inside and the outside of the internal space 240 is larger than that in the case where the internal space 240 is hollow. It can be reduced and the leakage of the plating solution to the internal space 240 can be suppressed or prevented. This makes it possible to suppress or prevent a decrease in the uniformity of the plating film thickness due to a leak of the plating solution.
- the inside of the internal space 240 is filled with pure water, so that the intrusion of the plating solution into the internal space 240 is limited to the diffused amount. Since it is suppressed to a very small amount, it is possible to suppress the local battery action caused by the dissolved oxygen concentration and / or the dissolution (corrosion) of the seed layer 401 due to the shunt current. Further, since the plating solution that has entered the internal space 240 is diluted with pure water, corrosion of the seed layer 401 can be further suppressed. This makes it possible to suppress or prevent a decrease in the uniformity of the plating film thickness.
- the internal space 240 is filled with pure water and the oxygen concentration is low, it is possible to suppress the dissolution of the seed layer 401 due to the local battery action caused by the dissolved oxygen. This makes it possible to suppress or prevent a decrease in the uniformity of the plating film thickness.
- the electrode 235A functioning as a sacrificial anode preferentially dissolves, and the dissolution of the seed layer 401 is suppressed or prevented. can do. This makes it possible to suppress or prevent a decrease in the uniformity of the plating film thickness due to a leak of the plating solution.
- the present embodiment by monitoring the current (electrical resistance) between the electrode 235A and the contact 213 (bus bar 214), the presence or absence of leakage of the plating solution to the internal space 240 can be detected at an early stage. Can be done. Therefore, even if a leakage of the plating solution occurs, it is possible to detect the leakage of the plating solution at an early stage by the electrode 235A, and detect an abnormality of the substrate holder 200 and a replacement time of the seal at an early stage. Therefore, it is possible to detect the leakage of the plating solution at an early stage and suppress or prevent the deterioration of the uniformity of the plating film thickness.
- the electrode 235A may be used only as the sacrificial anode without detecting the leak by the electrode 235A.
- an insoluble electrode 235B is adopted as the detector 230.
- the insoluble electrode an electrode made of stainless steel or titanium coated with, for example, gold or platinum, which is insoluble in the plating solution, can be used.
- an AC voltage is applied between the electrode 235B and the contact 213 (bus bar 214) by the AC power supply device 236B, and the electrode 235B and the contact 213 (bus bar 214) are connected. Leakage of the plating solution is detected by measuring the alternating current flowing between them (or the impedance as an electric resistance between the electrode 235B and the contact 213 (bus bar 214)).
- the alternating current flowing between the electrode 235B and the contact 213 (bus bar 214) corresponds to the current flowing through the pure water in the internal space 240.
- the electrical resistance (impedance) between the electrode 235B and the contact 213 (bus bar 214) corresponds to the electrical resistance (impedance) of pure water in the internal space 240.
- the current detector 237B is provided in the AC power supply device 236B or on the wiring from the AC power supply device 236B. As used herein, electrical resistance is assumed to include impedance or a resistance component of impedance.
- the application of AC voltage to the electrode 235B and the detection of current (electrical resistance) are controlled by the controller 175.
- the controller 175 acquires a current flowing through the electrode 235B (current flowing through pure water in the internal space 240) via the current detector 237B, and detects a leakage of the plating solution to the internal space 240 based on this current. Further, the controller 175 acquires the current flowing through the electrode 235B, calculates the electric resistance value of pure water from the voltage between the electrode 235B and the contact 213 (bus bar 214), and the detected current, and calculates the electric resistance value. Detect leaks based on.
- the electric resistance of the pure water in the internal space 240 is extremely high, so that no current flows between the electrode 235B and the contact 213 (bus bar 214) (or very little). Only a weak current flows).
- the plating solution is mixed with the pure water, the electric resistance value of the pure water decreases, and a current flows (or the current increases) between the electrode 235B and the contact 213 (bus bar 214). In this way, the insoluble electrode 235B can detect the leakage of the plating solution into the internal space 240.
- the configuration according to the example of FIG. 6B also has the same effect as the configuration according to the example of FIG. 6A except for the function of the sacrificial anode.
- the insoluble electrode 235B when used, the maintenance of the substrate holder 200 is easy.
- a soluble electrode sacrificial anode
- the plating solution leaks, a part of Cu dissolved from the sacrificial anode is deposited on the contact, and maintenance may be required to remove the precipitated Cu.
- the sacrificial anode is reduced, it needs to be replaced.
- such maintenance can be suppressed or prevented.
- the seed layer 401 may dissolve (when the contact resistance between the contact 213 and the seed layer 401 is high, or when there are air bubbles remaining in the internal space of the substrate holder), but the electrode 235B Since the leakage of the plating solution can be detected at an early stage by the (detector 230), it is possible to prevent the defective substrate holder from being continuously used by replacing the substrate holder, and to suppress the deterioration of the plating quality. Can be prevented.
- leak detection may be performed only on the electrode 235B, or leak detection may be performed on both the electrode 235A and the electrode 235B.
- leak detection is performed on both the electrode 235A and the electrode 235B, the redundancy of leak detection can be improved.
- the substrate holder of a quadrangular substrate has been described as an example, but the above embodiment can be applied to a substrate holder of a substrate having a circular shape, a polygonal shape other than a quadrangular shape, or any other shape.
- the substrate holder that holds the substrate by sandwiching it between the front plate and the back plate is given as an example, but if the substrate holder has an internal space in which the contacts are sealed, the substrate holder has an arbitrary configuration.
- the present invention can be applied to.
- a plating device in which a substrate holder is immersed in a plating solution to plate the substrate has been described as an example, but the substrate is held downward by the substrate holder and used as a plating solution.
- the present invention can also be applied to a plating apparatus (so-called cup type) for contacting and plating a substrate.
- pure water is introduced into the internal space of the substrate holder in the pre-wet module, but another module for introducing a liquid such as pure water may be provided in the internal space of the substrate holder.
- the liquid introduced into the internal space may be a liquid other than water as long as it does not corrode the components exposed in the internal space of the substrate holder.
- a liquid containing no metal salt a liquid in which the concentration of the metal salt is less than a predetermined concentration (for example, 5 g / L)
- a liquid containing no metal salt a liquid in which the concentration of the metal salt is less than a predetermined concentration (for example, 5 g / L)
- Such liquids include, for example, tap water, natural water, pure water. Pure water includes, for example, deionized water (DIW), distilled water, purified water, or RO water.
- the present invention can also be described as the following forms.
- it is a substrate holder for holding a substrate and bringing the substrate into contact with a plating solution for plating.
- the outer peripheral portion of the substrate is the substrate.
- a detector for detecting leakage of the plating solution to the internal space by monitoring the current flowing through the liquid or the electric resistance of the liquid during plating with the liquid introduced into the space is provided.
- a board holder is provided.
- the liquid can be, for example, water or any other liquid that does not corrode components exposed in the internal space of the substrate holder. As the liquid, for example, pure water used in the pre-wet process can be used.
- the internal space of the substrate holder is filled with the liquid, the pressure difference between the inside and the outside of the internal space is reduced, and the leakage of the plating solution to the internal space can be suppressed or prevented.
- the internal space is filled with the liquid, so that the invasion of the plating solution into the internal space is due to the amount diffused into the liquid. Since it is suppressed to a very small amount, corrosion of the seed layer of the substrate can be suppressed.
- the plating solution that has entered the internal space is diluted with the liquid, corrosion of the seed layer of the substrate can be further suppressed. Further, since the oxygen concentration in the internal space is low, it is possible to suppress corrosion of the seed layer due to the action of the local battery due to the dissolved oxygen.
- the leak of the plating solution can be detected at an early stage by the detector. This makes it possible to detect an abnormality in the substrate holder and the time to replace the seal at an early stage. Therefore, it is possible to detect the leakage of the plating solution at an early stage and suppress or prevent the deterioration of the uniformity of the plating film thickness.
- a contact which is arranged in the internal space and contacts the seed layer formed on the surface of the substrate to pass a plating current through the substrate, and a contact which is higher than the contact. It comprises a soluble electrode that is biased to the potential side.
- Electrodes can act as sacrificial anodes, preferentially dissolve, and suppress or prevent the dissolution of the seed layer.
- the soluble electrode functions as the detector, and the detector is attached to the contact or the contact with the liquid introduced into the internal space.
- the presence or absence of leakage of the plating solution can be detected by monitoring the current flowing between the sacrificial anode (soluble electrode) and the contact or the like, and therefore, a leak detection electrode is separately provided. There is no need.
- the substrate holder according to the first embodiment is provided with a contact arranged in the internal space and in contact with a seed layer formed on the surface of the substrate to allow a plating current to flow through the substrate, and the detector.
- the detector Has an insoluble electrode
- the detector has the contact or a wiring electrically conducted to the contact and the insoluble electrode in a state where the liquid is introduced into the internal space.
- the insoluble electrode is used as a detector, the metal of the electrode does not precipitate on the contacts and the like, and the maintenance of the substrate holder is easy.
- the substrate holder of the fourth embodiment further has a soluble electrode biased to the high potential side with respect to the contact.
- the soluble electrode preferentially dissolves in the seed layer, and the dissolution of the seed layer can be suppressed or prevented.
- the soluble electrode functions as the detector, and the detector leaks the plating solution into the internal space in both the insoluble electrode and the soluble electrode. It is configured to be detectable.
- the leakage of the plating solution is detected by both the soluble electrode (sacrificial anode) and the insoluble electrode, so that the detection accuracy of the leakage of the plating solution can be improved. Further, even if a defect occurs in one of the electrodes, the leakage of the plating solution can be detected, so that the leakage of the plating solution can be detected more reliably, and the redundancy of the leak detection can be improved. ..
- the wiring is a bus bar. According to this form, it is possible to reduce the installation space of the wiring as compared with the case of using a plurality of cables, and it is possible to suppress the electrical resistance of the wiring.
- a valve arranged in the first passage and conducting or shutting off between the outside of the substrate holder and the internal space is further provided.
- the substrate holder and the outside can be connected or cut off by opening and closing the valve, the substrate can be plated while the internal space of the substrate holder is securely sealed. ..
- a second passage for connecting the outside of the substrate holder and the internal space and discharging air and / or liquid from the internal space is further provided. ..
- the second passage may be connected to the decompression device, and the liquid may be introduced into the internal space from the first passage while or after the decompression. In this case, the liquid can be quickly introduced into the depressurized internal space.
- a third passage is further provided which connects the outside of the substrate holder with the internal space and is connected to a device for reducing the pressure in the internal space. ..
- the liquid since the liquid is introduced into the internal space from the first passage while the pressure is reduced or after the pressure is reduced, the liquid can be quickly introduced into the internal space.
- the liquid in any of the substrate holders of Form 1 to 10, the liquid is pure water or pure water that has been degassed or replaced with an inert gas.
- the internal space by introducing pure water into the internal space, it is possible to suppress the intrusion of the plating solution while suppressing the corrosion of the conductor member in the internal space. Further, if pure water or pure water substituted with degassed or inert gas is introduced into the internal space, the oxygen concentration in the internal space can be reduced, which is caused by the dissolved oxygen concentration when the plating solution invades. It is possible to suppress the chemical corrosion of the seed layer due to the local battery action.
- the plating apparatus includes the substrate holder according to any one of claims 1 to 11 and a liquid supply module that supplies liquid to the internal space through the first passage of the substrate holder.
- a plating module that accepts the substrate holder and brings it into contact with the plating solution to plate the substrate, and with the liquid introduced into the internal space, obtains the output from the detector during plating and obtains the output from the internal space.
- a plating apparatus including a control module for determining the presence or absence of leakage of the plating solution to the plating solution is provided.
- the liquid supply module is a pre-wet module in which the surface of the substrate is brought into contact with pure water or pure water replaced with degassed or inert gas.
- the liquid is introduced into the internal space of the substrate holder by the pre-wet module, it is not necessary to provide a separate module for introducing the liquid into the internal space, and the increase in size and / or the cost of the apparatus is suppressed. be able to.
- a method for plating a substrate in which a liquid is introduced into the internal space of the substrate holder that houses the outer peripheral portion of the substrate in a sealed state from the outside, and the liquid is introduced into the internal space.
- methods comprising detecting a leak of the plating solution into the internal space by monitoring the current flowing through the liquid or the electrical resistance of the liquid in the state of being.
- the fifteenth form it is a storage medium for storing a program for executing a control method of a plating apparatus by a computer, and a liquid is stored in the internal space of the substrate holder that accommodates the outer peripheral portion of the substrate in a sealed state from the outside.
- a storage medium for storing a program including the introduction of, and the detection of leakage of the plating solution into the internal space by monitoring the electrical resistance of the liquid with the liquid introduced into the internal space.
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Abstract
Description
図2は、めっきモジュール120Bを示す概略図である。同図に示すように、めっきモジュール120Bは、内部にめっき液を保持するめっき槽39と、めっき槽39内で基板ホルダ200に対向して配置されたアノード40と、アノード40を保持するアノードホルダ60と、を備えている。基板ホルダ200は、ウェハなどの基板Wを着脱自在に保持し、かつ基板Wをめっき槽39内のめっき液Qに浸漬させるように構成されている。本実施形態に係るめっき装置100は、めっき液Qに電流を流すことで基板Wの表面を金属でめっきする電解めっき装置である。アノード40としては、めっき液に溶解しない例えば酸化イリジウムまたは白金を被覆したチタンからなる不溶性アノードが用いられる。アノード40として、溶解性アノードを使用してもよい。溶解性アノードとして、例えば、含リン銅からなる溶解性アノードを用いることができる。基板Wは、例えば、半導体基板、ガラス基板、樹脂基板、又はその他任意の被処理対象物である。基板Wの表面にめっきされる金属は、例えば、銅(Cu)、ニッケル(Ni)、錫(Sn)、Sn-Ag合金、またはコバルト(Co)である。めっき液Qは、めっきする金属を含む酸性溶液であり、例えば、銅をめっきする場合は硫酸銅溶液である。
(1)上記実施形態では、四角形の基板の基板ホルダを例に挙げて説明したが、円形、四角形以外の多角形その他任意の形状の基板の基板ホルダに上記実施形態を適用可能である。
(2)上記実施形態では、フロントプレート及びバックプレートで基板を挟んで保持する基板ホルダを例に挙げたが、コンタクトがシールされた内部空間を有する基板ホルダであれば、任意の構成の基板ホルダに本発明を適用することができる。
(3)上記実施形態では、めっき液に基板ホルダを浸漬させて基板にめっきするめっき装置(いわゆるディップ式)を例に挙げて説明したが、基板を基板ホルダで下向きに保持してめっき液に接触させて基板にめっきするめっき装置(いわゆるカップ式)にも、本発明を適用可能である。
(4)上記実施形態では、プリウェットモジュールにおいて基板ホルダの内部空間に純水を導入したが、基板ホルダの内部空間に純水等の液体を導入するための別のモジュールを設けてもよい。
(5)内部空間に導入する液体は、基板ホルダの内部空間に露出する構成部品を腐食させない液体であれば、水以外の液体であってもよい。液体は、例えば、金属塩を含んでいない液体(金属塩の濃度が所定濃度(例えば5g/L)未満の液体)を用いることができる。このような液体は、例えば、水道水、天然水、純水を含む。純水は、例えば、脱イオン水(DIW)、蒸留水、精製水、又はRO水を含む。
形態1によれば、 基板を保持し、基板をめっき液に接触させてめっきするための基板ホルダであって、 前記基板ホルダで前記基板が保持された状態において、前記基板の外周部を前記基板ホルダの外部からシールした状態で収容する内部空間と、 前記基板ホルダの外部と前記内部空間とを連絡し、前記内部空間に液体を導入する第1通路と、 前記内部空間に配置され、前記内部空間に前記液体が導入された状態で、めっき中に前記液体に流れる電流又は前記液体の電気抵抗を監視することにより前記内部空間へのめっき液のリークを検出するための検出器と、を備える基板ホルダが提供される。液体は、例えば、水、または、基板ホルダの内部空間に露出する構成部品を腐食させないその他の液体とすることができる。液体は、例えば、プレウェット工程で使用される純水を使用することができる。
100 めっき装置
120B めっきモジュール
175 コントローラ
200 基板ホルダ
210 フロントプレート
211 保持体
211A 開口
212 ハンドル
213 コンタクト
214 バスバー
215 内側シール
216 外側シール
217 クランプ機構
218 外部接続端子
219 外部接続端子
220 バックプレート
221 保持体
222 ハンドル
225 内側シール
227 クランプ機構
230 検出器
231 導入通路
231A バルブ
232 排出通路
232A バルブ
235A 電極(犠牲アノード)
235B 電極
236A 直流電源装置
236B 交流電源装置
240 内部空間
300 プリウェットモジュール
301 処理槽
302 循環ライン
303 ポンプ
304 脱気モジュール
401 シード層
402 レジストパターン
Claims (15)
- 基板を保持し、基板をめっき液に接触させてめっきするための基板ホルダであって、
前記基板ホルダで前記基板が保持された状態において、前記基板の外周部を前記基板ホルダの外部からシールした状態で収容する内部空間と、
前記基板ホルダの外部と前記内部空間とを連絡し、前記内部空間に液体を導入する第1通路と、
前記内部空間に配置され、前記内部空間に前記液体が導入された状態で、めっき中に前記液体に流れる電流又は前記液体の電気抵抗を監視することにより前記内部空間へのめっき液のリークを検出するための検出器と、
を備える、基板ホルダ。 - 請求項1に記載の基板ホルダにおいて、
前記内部空間に配置され、前記基板の表面に形成されたシード層に接触して前記基板にめっき電流を流すコンタクトと、
前記コンタクトに対して高電位側にバイアスされる溶解性の電極と、
を備える、基板ホルダ。 - 請求項1に記載の基板ホルダにおいて、
前記溶解性の電極が前記検出器として機能し、
前記検出器は、前記内部空間に前記液体が導入された状態で、前記コンタクト又は前記コンタクトに電気的に導通された配線と前記電極との間に流れる電流を監視することにより、前記内部空間へのめっき液のリークを検出可能に構成されている、基板ホルダ。 - 請求項1に記載の基板ホルダにおいて、
前記内部空間に配置され、前記基板の表面に形成されたシード層に接触して前記基板にめっき電流を流すコンタクトを備え、
前記検出器は、不溶解性の電極を有し、
前記検出器は、前記内部空間に前記液体が導入された状態で、前記コンタクト又は前記コンタクトに電気的に導通された配線と前記不溶解性の電極との間に交流電圧を印加し、前記不溶解性の電極に流れる電流を監視することにより、前記内部空間へのめっき液のリークを検出可能に構成されている、基板ホルダ。 - 請求項4に記載の基板ホルダにおいて、
前記コンタクトに対して高電位側にバイアスされる溶解性の電極を更に備える、基板ホルダ。 - 請求項5に記載の基板ホルダにおいて、
前記溶解性の電極が前記検出器として機能し、
前記検出器は、前記不溶解性の電極及び前記溶解性の電極の両方で、前記内部空間へのめっき液のリークを検出可能に構成されている、基板ホルダ。 - 請求項3から6の何れかに記載の基板ホルダにおいて、前記配線はバスバーである、基板ホルダ。
- 請求項1から7の何れかに記載の基板ホルダにおいて、
前記第1通路に配置され、前記基板ホルダの外部と前記内部空間との間を導通又は遮断するバルブを更に備える、基板ホルダ。 - 請求項1から8の何れかに記載の基板ホルダにおいて、
前記基板ホルダの外部と前記内部空間とを連絡し、前記内部空間から空気及び/又は液体を排出する第2通路を更に備える、基板ホルダ。 - 請求項1から9の何れかに記載の基板ホルダにおいて、
前記基板ホルダの外部と前記内部空間とを連絡し、前記内部空間内を減圧する装置に接続される第3通路を更に備える、基板ホルダ。 - 請求項1から10の何れかに記載の基板ホルダにおいて、
前記液体は、純水、若しくは脱気又は不活性ガス置換された純水である、基板ホルダ。 - めっき装置であって、
請求項1から11の何れかに記載の基板ホルダと、
前記基板ホルダの前記第1通路を介して前記内部空間に液体を供給する液体供給モジュールと、
前記基板ホルダを受け入れてめっき液に接触させて前記基板をめっきするめっきモジュールと、
前記内部空間に液体が導入された状態で、めっき中に前記検出器からの出力を取得し、前記内部空間へのめっき液のリークの有無を判定する制御モジュールと、
を備えるめっき装置。 - 請求項12に記載のめっき装置において、
前記液体供給モジュールは、前記基板の表面を純水、若しくは脱気又は不活性ガス置換された純水に接触させるプリウェットモジュールである、めっき装置。 - 基板をめっきするための方法であって、
前記基板の外周部を外部からシールした状態で収容する前記基板ホルダの内部空間に液体を導入し、
前記内部空間に液体が導入された状態で、前記液体に流れる電流又は前記液体の電気抵抗を監視することにより、前記内部空間へのめっき液のリークを検出すること、
を含む、方法。 - めっき装置の制御方法をコンピュータにより実行させるためのプログラムを記憶する記憶媒体であって、
前記基板の外周部を外部からシールした状態で収容する前記基板ホルダの内部空間に液体を導入すること、
前記内部空間に液体が導入された状態で、前記液体に流れる電流又は前記液体の電気抵抗を監視することにより、前記内部空間へのめっき液のリークを検出すること、
を含むプログラムを記憶する記憶媒体。
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