WO2017204246A1 - 溶解性銅陽極、電解銅めっき装置、電解銅めっき方法、及び酸性電解銅めっき液の保存方法 - Google Patents
溶解性銅陽極、電解銅めっき装置、電解銅めっき方法、及び酸性電解銅めっき液の保存方法 Download PDFInfo
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- iridium oxide
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- 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
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- 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
- C25D17/12—Shape or form
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- 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
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- 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
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- 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
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- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/24—Reinforcing the conductive pattern
- H05K3/241—Reinforcing the conductive pattern characterised by the electroplating method; means therefor, e.g. baths or apparatus
Definitions
- the present invention relates to a soluble copper anode, an electrolytic copper plating apparatus, an electrolytic copper plating method, and a method for storing an acidic electrolytic copper plating solution.
- electrolytic copper plating has been used to form copper wiring on printed wiring boards and the like.
- this electrolytic copper plating has been used for damascene plating of wafers, and is expected to be applied to TSV (Through Silicon Via), TGV (Through Glass Via), and the like.
- plating techniques such as via filling and through-hole filling are being established, and demand is increasing.
- Patent Document 1 For this problem, as described in Patent Document 1, for example, attempts have been made to reduce anode sludge by a method using a drug or a device. Specifically, in Patent Document 1, generation of anode sludge is suppressed by adding alkenes and alkynes to an electrolytic copper plating solution using phosphorous copper as an anode.
- the present invention aims to provide a soluble copper anode, an electrolytic copper plating apparatus, an electrolytic copper plating method, and a method for storing an acidic electrolytic copper plating solution that can stably suppress the generation of anode sludge.
- the inventors of the present invention have achieved the above object by adopting the following method.
- Soluble copper anode according to the present invention is a soluble copper anode used for electrolytic copper plating, and a titanium case containing a copper material and an iridium oxide member in contact with the titanium case It is characterized by including.
- the shape of the copper material is preferably a ball shape.
- the copper material is preferably a phosphorous copper material.
- the plating solution in the electrolytic copper plating using the soluble copper anode according to the present invention is an acidic electrolytic copper plating solution containing a disulfide compound.
- the soluble copper anode according to the present invention preferably further includes an anode bag covering the titanium case and the iridium oxide member.
- the area ratio of the surface of the copper material and the iridium oxide member immersed in the acidic electrolytic copper plating solution is preferably 1000: 10 to 1000: 200.
- the surface material of the iridium oxide member is iridium oxide or an iridium oxide composite.
- the iridium oxide member is provided with a coating containing iridium oxide or an iridium oxide complex on the surface of a base material made of titanium, zirconium, stainless steel, or nickel alloy. It is preferable.
- the soluble copper anode according to the present invention is preferably such that the iridium oxide composite is a mixture of iridium oxide and one or more materials of tantalum oxide, titanium oxide, and platinum in an amount of 30 to 70%. .
- the shape of the base material is preferably any of a mesh, a sheet, a tube, a plate, a wire, a rod, and a ball.
- Electrolytic copper plating apparatus includes the above-described soluble copper anode.
- Electrolytic copper plating method uses the above-mentioned electrolytic copper plating apparatus and uses a direct current or a PPR current when performing electrolytic copper plating on a plating object.
- the electrolytic copper plating method according to the present invention it is preferable to use a printed wiring board or a wafer as the plating object.
- the acidic electrolytic copper plating solution storage method according to the present invention is an acidic electrolytic copper plating in which a soluble copper anode containing a titanium case containing a copper material is immersed.
- the soluble copper anode, electrolytic copper plating apparatus, electrolytic copper plating method, and acidic electrolytic copper plating solution storage method since the generation of anode sludge can be effectively suppressed, The plating characteristics can be improved. Moreover, according to the method for storing an acidic electrolytic copper plating solution according to the present invention, it is possible to effectively suppress the generation of anode sludge by suppressing the dissolution of the copper material of the soluble copper anode even during the electrolysis stop. I can do it.
- FIG. 6 is a cross-sectional photograph illustrating a via filling situation in Example 1.
- FIG. 6 is a cross-sectional photograph for explaining a via filling situation in Example 2.
- FIG. 10 is a cross-sectional photograph illustrating a via filling state in Example 3.
- FIG. 6 is a cross-sectional photograph for explaining a via filling situation in Example 4.
- FIG. 10 is a cross-sectional photograph illustrating a via filling state in Example 5.
- FIG. 10 is a cross-sectional photograph illustrating a via filling situation in Example 6.
- FIG. 6 is a cross-sectional photograph for explaining a via filling state in Comparative Example 1.
- FIG. 10 is a cross-sectional photograph for explaining a via filling situation in Comparative Example 2.
- FIG. 10 is a cross-sectional photograph for explaining a via filling situation in Comparative Example 3.
- FIG. 10 is a cross-sectional photograph for explaining a via filling situation in Comparative Example 3.
- FIG. 1 is a schematic cross-sectional view illustrating a case where a soluble copper anode according to the present invention is used in an electrolytic copper plating apparatus.
- the electrolytic copper plating apparatus includes the soluble copper anode according to the present invention.
- the said soluble copper anode is used for electrolytic copper plating, Comprising:
- the titanium case 3 which accommodated the copper material 2, and the iridium oxide member 4 which contacted the titanium case 3 are characterized by the above-mentioned. Below, these structures are demonstrated.
- the copper material 2 constituting the soluble copper anode 1 employing the soluble copper anode according to the present invention is used for generating copper ions during electrolysis to coat the surface of the member 20 to be plated with copper.
- the copper material 2 is preferably ball-shaped. When the shape of the copper material 2 is ball-shaped, the surface area of the copper anode can be increased as much as possible, and more copper ions can be generated during electrolysis to further increase the plating efficiency.
- the copper material 2 which comprises the soluble copper anode which concerns on this invention is a phosphorus containing copper material.
- a phosphorus-containing copper member for the soluble copper anode a film of a compound called “black film” called Cu 2 P is formed on the surface of the phosphorus-containing copper member during electrolysis, thereby generating monovalent copper ions. It is possible to suppress the generation of anode sludge.
- the phosphorous content is preferably about 0.02% to 0.06%.
- the use of the phosphorous-containing copper member for the soluble copper anode 1 is advantageous in that the copper dissolution during electrolysis can be performed smoothly.
- the titanium case 3 constituting the soluble copper anode according to the present invention may have any shape that can hold the copper material 2 described above immersed in the plating solution 11. For example, a plurality of holes are formed in the side wall. Can be used (such as mesh).
- the length of the titanium case 3 is related to the surface area of the copper material 2 to be accommodated. For example, when electrolytic copper plating is applied to the surface of a standard substrate (1.0 m ⁇ 1.0 m) at a mass production site, a titanium case of about ⁇ 60 mm ⁇ (1100 to 1300) mm is used.
- the current density of the cathode and anode to be used, the film thickness distribution of the copper plating coated on the surface of the member to be plated 20, and the like are taken into consideration.
- a general-purpose case can be used and is not particularly limited.
- the iridium oxide member 4 constituting the soluble copper anode according to the present invention preferably has at least a surface material of iridium oxide simple substance or iridium oxide composite.
- the iridium oxide member 4 can be provided with a coating containing iridium oxide on the surface of a base material made of any of titanium, zirconium, stainless steel, and nickel alloy.
- the base material of the iridium oxide member 4 is preferably a material that does not dissolve by electrolysis, such as the materials described above.
- the iridium oxide composite is preferably a mixture of iridium oxide and 30% to 70% of any one or more of tantalum oxide, titanium oxide, and platinum.
- the base material of the iridium oxide member 4 is preferably any one of mesh, sheet, tube, plate, wire, bar, and ball.
- the dimension of the iridium oxide member 4 is preferably the length of the titanium case used except for the ball shape.
- the iridium oxide member 4 has a shape and dimensions that efficiently generate a small amount of oxygen without interfering with the dissolution of the soluble copper anode during electrolysis, so that the monovalent copper generated in the vicinity of the iridium oxide member 4 Ions can be instantly converted into divalent copper ions to suppress the formation of anode sludge.
- the soluble copper anode according to the present invention more preferably further includes an anode bag 5 that covers the periphery of the titanium case 3 and the iridium oxide member 4.
- the soluble copper anode further includes an anode bag 5 so that the copper material 2 accommodated in the titanium case 3 is stably held in an oxidizing atmosphere, and monovalent copper ions that cause sludge are divalent. It can be effectively converted to copper ions.
- the soluble copper anode includes the anode bag 5, so that the formed anode sludge can be prevented from diffusing into the plating solution 11, and the plating characteristics can be prevented from deteriorating.
- the anode bag 5 can use a general purpose thing, and it does not specifically limit regarding a shape, a material, etc.
- an acidic copper plating solution is used as the plating solution 11 used in the electrolytic copper plating apparatus according to the present invention.
- the acidic copper plating solution 11 is a copper sulfate plating solution comprising copper sulfate / pentahydrate, sulfuric acid, chloride ions and additives.
- the composition of the acidic copper plating solution 11 can be used in the ranges of 30 g / L to 250 g / L of copper sulfate / pentahydrate, 30 g / L to 250 g / L of sulfuric acid, and 30 mg / L to 75 mg / L of chloride ions.
- the temperature of the acidic copper plating solution 11 can usually be used in a range of 15 ° C.
- the acidic copper plating solution 11 used in the electrolytic copper plating apparatus according to the present invention contains a disulfide compound.
- a disulfide compound for example, bis (3-sulfopropyl) disulfide (hereinafter simply referred to as “SPS”) has been used as a brightener component when electrolytic copper plating is performed.
- SPS bis (3-sulfopropyl) disulfide
- MPS 3-mercaptopropane-1-sulfonic acid
- the area ratio of the surface of the copper material 2 and the iridium oxide member 4 immersed in the acidic electrolytic copper plating solution 11 is preferably 1000: 10 to 1000: 200. If the area ratio of the surface of the copper material 2 and the iridium oxide member 4 immersed in the acidic electrolytic copper plating solution 11 is less than 1000: 10, since the generation of oxygen from the surface of the iridium oxide member 4 is extremely small, the MPS is efficiently performed. It is not possible to suppress the occurrence of Further, when the area ratio exceeds 1000: 200, oxygen generation from the surface of the iridium oxide member 4 is remarkably increased. Therefore, the additive consumption in the plating solution 11 is increased by oxidative decomposition.
- the area ratio is more preferably 1000: 50 to 1000: 100, and still more preferably 1000: 75 to 1000: 125. If necessary, in order to adjust the surface area of the iridium oxide member 4 immersed in the acidic electrolytic copper plating solution 11, it may be masked with silicon rubber or the like.
- the applicable cathode current density is preferably in a range in which a phosphorous copper member that is usually used for plating of a printed board is used.
- the cathode current density 0.1A / dm 2 ⁇ 10A / dm 2 , preferably about 0.5A / dm 2 ⁇ 6A / dm 2, more preferably 1A / dm 2 ⁇ 5A / dm 2 It is.
- the anode current density is usable in conventional 0.1A / dm 2 ⁇ 3A / dm 2, more preferably 1A / dm 2 ⁇ 3A / dm 2.
- the copper concentration in the acidic copper plating solution 11 tends to increase if the anode current density is too low, and tends to decrease if the anode current density is too high. Therefore, the anode area needs to be adjusted depending on the cathode current density used. It is.
- the soluble copper anode according to the present invention accommodates the copper material 2.
- the corrosion potential of the copper material 2 when the titanium case 3 is brought into contact and indirectly in contact with the iridium oxide member 4 is determined by the potential of the copper material 2 alone. It is possible to suppress the dissolution of the copper material 2 in the acidic electrolytic copper plating solution 11. As a result, it is possible to suppress the dissolution of the copper material 2 during the electrolysis stop and suppress the generation of MPS.
- the iridium oxide member 4 in the present invention is brought into contact with the titanium case 3 to generate nascent oxygen having a higher activity than the surface of the iridium oxide member 4 during electrolysis, so that the surroundings of the titanium case 3 In an oxidizing atmosphere to convert monovalent copper ions into divalent copper ions, thereby suppressing generation of anode sludge composed of CuCl, Cu 2 O, or the like.
- the electrolytic copper plating apparatus includes the soluble copper anode 1 according to the present invention, thereby forming a high-quality plating film at a low cost while improving the plating efficiency. I can do it.
- the electrolytic copper plating method according to the present invention is characterized in that a direct current or a PPR (pulse periodical reverse) current is used when electrolytic copper plating is performed on the plating object 20 using the above-described electrolytic copper plating apparatus.
- a direct current or a PPR (pulse periodical reverse) current is used when electrolytic copper plating is performed on the plating object 20 using the above-described electrolytic copper plating apparatus.
- a direct current when electrolytic plating is performed on the plating object 20
- generally used conditions can be appropriately employed.
- a direct current power source capable of obtaining a constant and stable current value can be used.
- a three-phase full-wave rectifier (ripple 5% or less) can be used.
- a PPR current can be used when the plating object 20 is subjected to electrolytic copper plating.
- the “PPR current” refers to a current whose direction of current periodically changes in a pulse waveform so that forward electrolysis (electrolysis for depositing plating) and reverse electrolysis are repeated in a short cycle.
- the PPR current it is possible to obtain a high resistance overvoltage that cannot be obtained with a direct current, and therefore, it is possible to ensure a high plating resistance. Therefore, it is most suitable for filling a through-hole substrate having a high aspect ratio (plate thickness / hole diameter) or a deep via having a small hole diameter.
- the period of the current can be arbitrarily set, but it is preferable that the normal electrolysis time is longer than the reverse electrolysis time.
- the positive electrolysis time is preferably 0.1 msec to 50 msec, more preferably 1 msec to 20 msec.
- the reverse electrolysis time is preferably 0.1 msec to 5 msec, more preferably 0.5 msec to 2 msec.
- a printed wiring board or a wafer as the plating object 20 described above.
- electrical connection between layers is usually achieved by through holes and blind via holes (BVH).
- a through hole diameter of 0.15 mm to 2.8 mm and a plate thickness of 0.6 mm to 3.2 mm are generally used as this through hole.
- the blind via hole generally has a via diameter of about 20 ⁇ m to 200 ⁇ m and a depth of about 10 ⁇ m to 100 ⁇ m.
- a semiconductor wafer employs a damascene process in which copper wiring having excellent conductivity is formed by copper sulfate plating.
- This process fills submicron vias and trenches on a semiconductor wafer by copper sulfate plating.
- it is necessary to suppress the formation of MPS due to decomposition of SPS used as a brightener component.
- the copper plating method according to the present invention such alteration of SPS is effectively suppressed. It becomes possible to do.
- the method for storing an acidic electrolytic copper plating solution according to the present invention is a method for storing an acidic electrolytic copper plating solution 11 in which a soluble copper anode 1 including a titanium case 3 containing a copper material 2 is immersed.
- the iridium oxide member 4 is brought into contact with the titanium case 3 while the electrolysis is stopped. At least during the electrolysis stop, the iridium oxide member 4 is brought into contact with the titanium case 3 to generate monovalent copper ions during the electrolysis stop or to generate MPS when SPS is used for the plating solution as described above. Can be suppressed.
- the soluble copper anode, the electrolytic copper plating apparatus, the electrolytic copper plating method, and the storage method of the acidic electrolytic copper plating solution according to the present invention have been described, but examples of the present invention are shown below, and the present invention is further described. This will be described in detail. In addition, this invention is not limited at all by these examples.
- Example 1 a test was performed to confirm the via filling state when electrolytic copper plating was performed with an iridium oxide member in contact with a titanium case filled with a phosphorous copper anode.
- electrolytic copper plating was performed with an iridium oxide member in contact with a titanium case filled with a phosphorous copper anode.
- Example 1 desmear treatment is first performed on a member to be plated (printed circuit board) 20 having a plate thickness of 1.0 mm, a via diameter of 100 ⁇ m, and a depth of 80 ⁇ m by Melplate MLB-6001 process (manufactured by Meltex Co., Ltd.). It was. Next, electroless copper plating was performed by Melplate CU-390 process (Meltex Co., Ltd.). The printed circuit board 20 was degreased with Melplate CL-1000S (manufactured by Meltex Co., Ltd.), washed with water, treated with 10% sulfuric acid, washed with water, and then subjected to electrolytic copper plating under the following conditions.
- Melplate CL-1000S manufactured by Meltex Co., Ltd.
- the acidic copper plating solution 11 used in Example 1 was prepared by adding Lucent Copper SVF-A (Meltex Co., Ltd.) to a plating solution containing copper sulfate / pentahydrate concentration of 220 g / L, sulfuric acid 50 g / L, and chloride ions 50 mg / L. 1.
- a 5 L via fill bath was used.
- the soluble copper anode 1 was arrange
- the soluble copper anode 1 is composed of a titanium case ( ⁇ 30 mm ⁇ 150 mm) 3 containing a copper material (five phosphorus-containing copper balls of ⁇ 25) 2 and an iridium oxide member (rod coated with iridium oxide ( ⁇ 5 mm ⁇ 100 mm)) 4 Was brought into contact. Further, an anode bag 5 covering the periphery of the titanium case 3 and the iridium oxide member 4 was further provided. In addition, although it differs from the structure shown in FIG. 1, in Example 1, two sets of this soluble copper anode 1 were immersed.
- Example 1 the area ratio of the surface immersed in the acidic electrolytic copper plating solution 11 of the copper material 2 and the iridium oxide member 4 was 1000: 100.
- Example 2 the area ratio of the surface immersed in the acidic electrolytic copper plating solution 11 of the copper material 2 and the iridium oxide member 4 was 1000: 100.
- was also immersed printed circuit board 20 which has been subjected to electroless copper plating of 5 mm ⁇ 130 mm as a cathode in an acidic copper plating solution 11 such that the 1 dm 2. This was electrolyzed at a current density of 2 A / dm 2 until the amount of electrolysis reached 5 AH / L, and then left overnight.
- the additive was analyzed and adjusted by the CVS method using the plating solution left to stand overnight, and plated at 2 A / dm 2 at 15 ⁇ m. After plating, the filling state in the via was observed by the cross section method.
- FIG. 2 shows a cross-sectional photograph of the via filling state in Example 1.
- Fig.2 (a) the cross-sectional photograph when it electrolyzes until the amount of electrolysis becomes 5 AH / L is shown.
- FIG. 2B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- the via filling in Example 1 is again performed using the plating solution after electrolysis until the amount of electrolysis reaches 5 AH / L and after standing overnight after electrolysis. No particular change was observed when electrolytic copper plating was performed.
- Table 1 The evaluation results performed in Example 1 are shown in Table 1.
- Example 2 as in Example 1, a test for confirming the filling state of vias when electrolytic copper plating was performed with an iridium oxide member in contact with a titanium case filled with a phosphorous copper anode Went.
- Example 2 the same member to be plated 20 as in Example 1 was used. Moreover, in Example 2, the same process as Example 1 was performed on the same conditions, before performing electrolytic copper plating. And electrolytic copper plating was performed on the conditions shown below.
- the acidic copper plating solution 11 used in Example 2 was prepared by adding Lucent Copper HCS-A (Meltex Co., Ltd.) to a plating solution containing copper sulfate / pentahydrate concentration 150 g / L, sulfuric acid 150 g / L, and chloride ion 50 mg / L. 1.
- Disulfide) 0.3 mL / L
- Lucent Copper HCS-B Meltex Co., Ltd.
- Lucent Copper HCS-L Meltex Co., Ltd.
- a 5 L half-fill bath for flexible substrates was prepared.
- the soluble copper anode 1 was arrange
- the soluble copper anode 1 used here was the same as in Example 1.
- Example 2 the area ratio of the surface of the copper material 2 and the iridium oxide member 4 immersed in the acidic electrolytic copper plating solution 11 was 1000: 100, the same as in Example 1. Moreover, the printed circuit board 20 which performed electroless copper plating of 5 mm x 130 mm as a cathode was immersed in the acidic copper plating solution 11 so that it might become 1 dm ⁇ 2 > like Example 1. FIG. This was electrolyzed at a current density of 3 A / dm 2 until the amount of electrolysis reached 5 AH / L, and then left overnight.
- the additive was analyzed and adjusted by the CVS method using the plating solution that had been allowed to stand overnight, and was plated at 15 ⁇ m at 3 A / dm 2 . After plating, the filling state in the via was observed by the cross section method.
- FIG. 3 shows a cross-sectional photograph of the via filling state in Example 2.
- FIG. 3A shows a cross-sectional photograph when electrolysis is performed until the amount of electrolysis reaches 5 AH / L.
- FIG. 3B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- 3 (a) and 3 (b) the via filling state in Example 2 was again performed using the plating solution after electrolysis until the amount of electrolysis reached 5 AH / L and after standing overnight after electrolysis. No particular change was observed when electrolytic copper plating was performed.
- the evaluation results performed in Example 2 are shown in Table 1.
- Example 3 as in Example 1, a test for confirming the filling state of vias when electrolytic copper plating was performed with an iridium oxide member in contact with a titanium case filled with a phosphorus-containing copper anode. Went.
- Example 3 the same member to be plated 20 as in Example 1 was used. Moreover, in Example 3, before performing electrolytic copper plating, the same process as Example 1 was performed on the same conditions. And electrolytic copper plating was performed on the conditions shown below.
- Example 3 The same acid copper plating solution 11 used in Example 3 as in Example 1 was used. Moreover, the soluble copper anode 1 used in Example 3 was the same as that of Example 1 except that a plate (20 mm ⁇ 120 mm ⁇ 1 mm) coated with iridium oxide was used as the iridium oxide member 4. .
- Example 3 the area ratio of the surface immersed in the acidic electrolytic copper plating solution 11 of the copper material 2 and the iridium oxide member 4 was 1000: 200.
- the printed circuit board 20 subjected to electroless copper plating of 5 mm ⁇ 130 mm as the cathode was immersed in the acidic copper plating solution 11 so as to be 1 dm 2 . This was electrolyzed under the same conditions as in Example 1, and after plating, the filling state in the via was observed by a cross section method.
- FIG. 4 shows a cross-sectional photograph of the via filling state in Example 3.
- Fig.4 (a) the cross-sectional photograph when it electrolyzes until the electrolysis amount will be 5 AH / L is shown.
- FIG. 4B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- 4 (a) and 4 (b) the via filling state in Example 3 is again performed using the plating solution after electrolysis until the amount of electrolysis reaches 5 AH / L and after standing overnight after electrolysis. No particular change was observed when electrolytic copper plating was performed.
- Table 1 The evaluation results performed in Example 3 are shown in Table 1.
- Example 4 as in Example 1, a test for confirming the filling state of vias when electrolytic copper plating was performed in a state where an iridium oxide member was in contact with a titanium case filled with a phosphorous copper anode. Went.
- Example 4 the same member 20 to be plated as in Example 1 was used. Moreover, in Example 4, before performing electrolytic copper plating, the same process as Example 1 was performed on the same conditions. And electrolytic copper plating was performed on the conditions shown below.
- the acidic copper plating solution 11 used in Example 4 was the same as in Example 1.
- the soluble copper anode 1 used in Example 4 has the same configuration as that of Example 1 except that a wire ( ⁇ 1 mm ⁇ 120 mm) coated with IrO 2 —Pt (0.3) is used as the iridium oxide member 4. The thing of was used.
- Example 4 the area ratio of the surface immersed in the acidic electrolytic copper plating solution 11 of the copper material 2 and the iridium oxide member 4 was 1000: 10.
- the printed circuit board 20 subjected to electroless copper plating of 5 mm ⁇ 130 mm as the cathode was immersed in the acidic copper plating solution 11 so as to be 1 dm 2 . This was electrolyzed under the same conditions as in Example 1, and after plating, the filling state in the via was observed by a cross section method.
- FIG. 5 shows a cross-sectional photograph of the via filling state in Example 4.
- FIG. 5A shows a cross-sectional photograph when electrolysis is performed until the amount of electrolysis reaches 5 AH / L.
- FIG. 5B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- 5 (a) and 5 (b) the via filling state in Example 4 is again performed using the plating solution after electrolysis until the amount of electrolysis reaches 5 AH / L and after standing overnight after electrolysis. No particular change was observed when electrolytic copper plating was performed.
- the evaluation results performed in Example 4 are shown in Table 1.
- Example 5 as in Example 1, a test for confirming the filling state of vias when electrolytic copper plating was performed in a state where an iridium oxide member was in contact with a titanium case filled with a phosphorus-containing copper anode. Went.
- Example 5 the same member to be plated 20 as in Example 1 was used. Moreover, in Example 5, before performing electrolytic copper plating, the same process as Example 1 was performed on the same conditions. And electrolytic copper plating was performed on the conditions shown below.
- the acidic copper plating solution 11 used in Example 5 was the same as in Example 1.
- the soluble copper anode 1 used in Example 5 is the same as Example 1 except that a plate (10 mm ⁇ 120 mm ⁇ 1 mm) coated with IrO 2 —TiO 2 (0.7) is used as the iridium oxide member 4. The same configuration was used.
- Example 5 the surface area ratio of the copper material 2 and the iridium oxide member 4 immersed in the acidic electrolytic copper plating solution 11 was 1000: 100, the same as in Example 1. Moreover, the printed circuit board 20 which performed electroless copper plating of 5 mm x 130 mm as a cathode was immersed in the acidic copper plating solution 11 so that it might become 1 dm ⁇ 2 > like Example 1. FIG. This was electrolyzed under the same conditions as in Example 1, and after plating, the filling state in the via was observed by a cross section method.
- FIG. 6 shows a cross-sectional photograph of the via filling state in Example 5.
- FIG. 6A shows a cross-sectional photograph when electrolysis is performed until the amount of electrolysis reaches 5 AH / L.
- FIG. 6B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- 6 (a) and 6 (b) the via filling state in Example 5 is again performed using the plating solution after electrolysis until the amount of electrolysis reaches 5 AH / L and after standing overnight after electrolysis. No particular change was observed when electrolytic copper plating was performed.
- Table 1 shows the results of evaluation performed in Example 5.
- Example 6 as in Example 1, a test for confirming the filling state of vias when electrolytic copper plating was performed in a state where an iridium oxide member was in contact with a titanium case filled with a phosphorous copper anode. Went.
- Example 6 the same member 20 to be plated as in Example 1 was used. Moreover, in Example 6, before performing electrolytic copper plating, the same process as Example 1 was performed on the same conditions. And electrolytic copper plating was performed on the conditions shown below.
- the acidic copper plating solution 11 used in Example 6 was the same as in Example 1. Further, the soluble copper anode 1 used in Example 6 was carried out except that a plate (5 mm ⁇ 100 mm ⁇ 1 mm) coated with IrO 2 —Ta 2 O 5 (0.3) was used as the iridium oxide member 4. The thing of the same structure as Example 1 was used.
- Example 6 the area ratio of the surface immersed in the acidic electrolytic copper plating solution 11 of the copper material 2 and the iridium oxide member 4 was 1000: 50. Moreover, the printed circuit board 20 which performed electroless copper plating of 5 mm x 130 mm as a cathode was immersed in the acidic copper plating solution 11 so that it might become 1 dm ⁇ 2 > like Example 1. FIG. This was electrolyzed under the same conditions as in Example 1, and after plating, the filling state in the via was observed by a cross section method.
- FIG. 7 shows a cross-sectional photograph of the via filling state in Example 6.
- FIG. 7A shows a cross-sectional photograph when electrolysis is performed until the amount of electrolysis reaches 5 AH / L.
- FIG. 7B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- 7 (a) and 7 (b) the via filling state in Example 6 was again performed using electrolysis until the amount of electrolysis reached 5 AH / L, and using the plating solution after standing overnight after electrolysis. No particular change was observed when electrolytic copper plating was performed.
- the evaluation results obtained in Example 6 are shown in Table 1.
- Comparative Example 1 In the comparative example 1, the test for confirming the filling condition of the via
- Comparative Example 1 the test was performed under the same conditions as in Example 1 except that the iridium oxide member was not brought into contact with the titanium case filled with the phosphorous-containing copper anode. To do.
- FIG. 8 shows a cross-sectional photograph of the via filling in Comparative Example 1.
- FIG. 8A shows a cross-sectional photograph when electrolysis is performed until the amount of electrolysis reaches 5 AH / L.
- FIG. 8B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- the via filling state in Comparative Example 1 uses a plating solution that has been allowed to stand overnight after electrolysis, compared to when electrolysis is performed until the electrolysis amount reaches 5 AH / L.
- Table 1 shows the results of evaluation performed in Comparative Example 1.
- Comparative Example 2 In Comparative Example 2, as in Comparative Example 1, a test for confirming the filling state of vias when electrolytic copper plating was performed without contacting an iridium oxide member to a titanium case filled with a phosphorous copper anode was performed. went.
- Example 2 the test was performed under the same conditions as in Example 2 except that the iridium oxide member was not brought into contact with the titanium case filled with the phosphorous-containing copper anode. To do.
- FIG. 9 shows a cross-sectional photograph of the via filling in Comparative Example 2.
- FIG. 9A shows a cross-sectional photograph when electrolysis is performed until the amount of electrolysis reaches 5 AH / L.
- FIG. 9B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- 9 (a) and 9 (b) the via filling state in Comparative Example 2 uses a plating solution that has been allowed to stand overnight after electrolysis, compared to when electrolysis is performed until the electrolysis amount reaches 5 AH / L.
- the evaluation results obtained in Comparative Example 2 are shown in Table 1.
- Comparative Example 3 In Comparative Example 3, as in Comparative Example 1, a test for confirming the via filling state when electrolytic copper plating was performed without contacting the iridium oxide member to the titanium case filled with the phosphorous copper anode was performed. went.
- Comparative Example 3 except that the iridium oxide member was not brought into contact with the titanium case filled with the phosphorous-containing copper anode, and 5 g / L of maleic acid was added to the via fill bath described in Japanese Patent No. 5659411 and electrolytic copper plating was performed. Since the test was performed under the same conditions as in Example 1, the description thereof is omitted here.
- FIG. 10 shows a cross-sectional photograph of the via filling in Comparative Example 3.
- FIG. 7A shows a cross-sectional photograph when electrolysis is performed until the amount of electrolysis reaches 5 AH / L.
- FIG. 7B shows a cross-sectional photograph when electrolytic copper plating is performed again using a plating solution that has been left overnight after electrolysis.
- the via filling in Comparative Example 3 uses a plating solution that has been allowed to stand overnight after electrolysis, as compared with the case where electrolysis is performed until the amount of electrolysis reaches 5 AH / L.
- the evaluation results obtained in Comparative Example 3 are shown in Table 1.
- the soluble copper anode used for the electrolytic copper plating is configured to have the iridium oxide member in contact with the titanium case containing the copper material, thereby suppressing the dissolution of the copper material during the electrolysis stop and the MPS. It was found that the generation of can be suppressed. Therefore, when electrolytic copper plating is performed using a soluble copper anode having a structure in which an iridium oxide member is brought into contact with a titanium case containing a copper material, the generation of anode sludge is suppressed and the adverse effect of MPS is reduced. It can be understood that it can be effectively eliminated.
- the soluble copper anode According to the soluble copper anode, electrolytic copper plating apparatus, electrolytic copper plating method, and acidic electrolytic copper plating solution storage method according to the present invention, generation of anode sludge can be stably suppressed.
- the soluble copper anode according to the present invention can be used by being mounted on a titanium case that has been conventionally used in a structure containing phosphorus-containing copper balls, so that no new equipment is introduced. Economical.
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Abstract
Description
比較例1では、含リン銅アノードを充填させたチタンケースに酸化イリジウム部材を接触させない状態で電解銅めっきを行った場合のビアの充填状況を確認するための試験を行った。
比較例2では、比較例1と同様に、含リン銅アノードを充填させたチタンケースに酸化イリジウム部材を接触させない状態で電解銅めっきを行った場合のビアの充填状況を確認するための試験を行った。
比較例3では、比較例1と同様に、含リン銅アノードを充填させたチタンケースに酸化イリジウム部材を接触させない状態で電解銅めっきを行った場合のビアの充填状況を確認するための試験を行った。
2・・・銅材
3・・・チタンケース
4・・・酸化イリジウム部材
5・・・アノードバッグ
10・・・めっき槽
11・・・めっき液(酸性銅めっき液)
20・・・被めっき部材(めっき対象物)
Claims (14)
- 電解銅めっきに用いる溶解性銅陽極であって、
銅材を収容したチタンケースと、当該チタンケースに接触した酸化イリジウム部材とを含むことを特徴とする溶解性銅陽極。 - 前記銅材の形状がボール状である請求項1に記載の溶解性銅陽極。
- 前記銅材が含リン銅材である請求項1又は請求項2に記載の溶解性銅陽極。
- 前記電解銅めっきに用いるめっき液は、ジスルフィド化合物を含有した酸性電解銅めっき液である請求項1~請求項3のいずれかに記載の溶解性銅陽極。
- 前記チタンケース及び前記酸化イリジウム部材の周囲を覆うアノードバッグを更に備えた請求項1~請求項4のいずれかに記載の溶解性銅陽極。
- 前記銅材と前記酸化イリジウム部材との前記酸性電解銅めっき液に浸漬した表面の面積比率は、1000:10~1000:200である請求項1~請求項5のいずれかに記載の溶解性銅陽極。
- 前記酸化イリジウム部材は、少なくとも表面の材質が酸化イリジウム又は酸化イリジウム複合体である請求項1~請求項6のいずれかに記載の溶解性銅陽極。
- 前記酸化イリジウム部材は、チタン、ジルコニウム、ステンレススチール、及びニッケル合金の何れかからなる基材の表面に酸化イリジウム又は酸化イリジウム複合体を含有した被覆を備えた請求項7に記載の溶解性銅陽極。
- 前記酸化イリジウム複合体は、酸化イリジウムに酸化タンタル、酸化チタン、及び白金の何れか一つ又は複数の材料が30~70%混合されたものである請求項7又は請求項8に記載の溶解性銅陽極。
- 前記基材の形状は、メッシュ、シート、管、板、線、棒、及びボール状の何れかである請求項8又は請求項9に記載の溶解性銅陽極。
- 請求項1~請求項10のいずれかに記載の溶解性銅陽極を備えたことを特徴とする電解銅めっき装置。
- 請求項11に記載の電解銅めっき装置を用い、
めっき対象物に電解銅めっきを施す際に直流電流又はPPR電流を使用することを特徴とする電解銅めっき方法。 - 前記めっき対象物としてプリント配線基板又はウエハーを用いる請求項12に記載の電解銅めっき方法。
- 銅材を収容したチタンケースを構成に含む溶解性銅陽極が浸漬された酸性電解銅めっき液の保存方法であって、
少なくとも電解停止中に、当該チタンケースに酸化イリジウム部材を接触させることを特徴とする酸性電解銅めっき液の保存方法。
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CN114892247A (zh) * | 2022-05-26 | 2022-08-12 | 山东聚力焊接材料有限公司 | 一种焊丝镀铜装置、电极板的制备方法和焊丝镀铜方法 |
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KR102515271B1 (ko) * | 2021-05-31 | 2023-03-29 | 주식회사 다이브 | 다층 금속박막 및 이의 제조방법 |
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