WO2006103751A1 - 銅エッチング液及びエッチング方法 - Google Patents
銅エッチング液及びエッチング方法 Download PDFInfo
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- WO2006103751A1 WO2006103751A1 PCT/JP2005/005976 JP2005005976W WO2006103751A1 WO 2006103751 A1 WO2006103751 A1 WO 2006103751A1 JP 2005005976 W JP2005005976 W JP 2005005976W WO 2006103751 A1 WO2006103751 A1 WO 2006103751A1
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- Prior art keywords
- copper
- etching
- etching solution
- surfactant
- group
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
- C23F1/34—Alkaline compositions for etching copper or alloys thereof
-
- H10P50/667—
Definitions
- the present invention relates to an etching solution for selectively etching copper or a copper alloy by a wet etching method, and a method for etching copper or a copper alloy using this etching solution. More specifically, the present invention relates to a copper etching solution and an etching method suitable for etching of a semiconductor device such as a semiconductor device or a liquid crystal display device, copper or a copper alloy thin film in manufacturing a printed circuit board, an IC card, or the like.
- Semiconductor devices such as semiconductor devices and liquid crystal display devices, printed circuit boards, IC cards, and the like generally form metal thin film elements and electrode wiring elements by patterning metal thin films on the substrate. Manufactured.
- a photoresist pattern formed on the surface of the metal thin film by a photolithography technique is used as a mask, or by etching with a chemical.
- Examples include a wet etching method that performs pattern force check and a dry etching method such as ion etching or plasma etching.
- the wet etching method is economically advantageous because it does not require an expensive apparatus and uses a relatively inexpensive chemical compared to the dry etching method.
- uniform etching can be performed. It has the advantage that it can be applied to those with a three-dimensional structure that is not easily affected by the shape. For this reason, at present, the wet etching method is frequently used as a method of manufacturing a thin film pattern.
- an etching solution used when patterning a device or the like using copper or a copper alloy generally, an alkaline etching solution such as amine or ammonia water, an aqueous solution of ferric chloride, a second solution of chloride.
- An aqueous solution of dicopper, an aqueous solution of persulfate, and an acidic etching solution in which sulfuric acid and hydrogen peroxide are mixed have been used (for example, patent documents:! To 5).
- etching solution not only the uniform etching property of copper or copper alloy but also the selection of copper or copper alloy is used as the etching solution.
- Etchability is required. That is, when creating an element using copper or a copper alloy, for example, on an insulating substrate made of an organic material such as silicon, glass, alumina, or a polymer resin, copper or a copper alloy such as Nikkenore or a nickel alloy is used. A laminated film in which copper or a copper alloy is laminated is formed through a metal thin film other than the above.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-266087
- Patent Document 2 Japanese Patent Laid-Open No. 10-96088
- Patent Document 3 JP-A-8-60386
- Patent Document 4 Japanese Patent Laid-Open No. 2002-348685
- Patent Document 5 Japanese Unexamined Patent Publication No. 2000-248386
- etching solutions for copper or copper alloys for example, acidic etching solutions containing acids such as sulfuric acid and hydrogen peroxide water, etc.
- these etchants contain water as the main component. Therefore, sufficient wettability with copper or copper alloy is not obtained. For this reason, etching delays and etching residues are likely to occur in microfabrication.
- the conventional etching solution has a low etching selectivity for etching only copper or a copper alloy without etching other metals in a system in which other metals coexist. For these reasons, it has been difficult to selectively and uniformly etch copper or copper alloys when forming fine elements using copper or copper alloys.
- the present invention solves the above-mentioned conventional problems, and can etch copper or copper alloy selectively and uniformly even when other metals coexist, etching solution for copper or copper alloy And an etching method of copper or a copper alloy using the etching solution.
- the copper etching solution of the present invention is an etching solution for etching copper or a copper alloy, contains at least ammonium oxalate, hydrogen peroxide, and a surfactant, and has a surface tension of 45 mNZm or less.
- the pH is 6.0 to 8.5.
- ammonium oxalate and hydrogen peroxide and an effective amount for reducing the surface tension of the etching solution to 45 mN / m or less.
- An etchant with a specific pH containing one or more surfactants contains other metals having good conductivity, particularly aluminum, titanium, nickel, tin, lead, silver, gold, palladium, or one or more of these metals. Even in the case of a fine device structure in which the main component alloy coexists, it has been found that only copper or copper alloy can be selectively and uniformly etched, and the present invention has been completed.
- the copper etching solution of the present invention preferably further contains 0.2 to 25% by weight of an amino acid.
- an amino acid glycine is preferable.
- SO M group As the surfactant, SO M group, OSO M group, and COO
- Nonionic surfactants having [0014]
- the content of each component in the etching solution of the present invention is as follows: ammonium oxalate is 0.05 to 5% by weight, hydrogen peroxide is 0.2 to 10% by weight, and the surfactant is 0.000 :! It is preferably ⁇ 5% by weight.
- a metal having good conductivity for wiring or electrodes in particular, anoleminium, titanium, nickel, tin, lead, silver, gold, palladium, and one or more of these metals Copper or a copper alloy can be etched uniformly and selectively in the presence of a metal selected from the group consisting of alloys containing as a main component.
- This etchant is preferably used at a temperature of 20 to 50 ° C.
- the copper etching solution of the present invention is prepared by mixing an active ingredient containing at least ammonium oxalate, hydrogen peroxide, and a surfactant with water and preparing a prepared copper etching solution other than hydrogen peroxide. It is preferable that the mixture is prepared by mixing the active ingredient and water and then adding hydrogen peroxide to the mixture.
- the etching method of the present invention is a method of selectively etching copper or a copper alloy in the presence of a metal having good conductivity for wiring or an electrode, It can be used to etch copper or copper alloy uniformly and selectively.
- the invention's effect is a method of selectively etching copper or a copper alloy in the presence of a metal having good conductivity for wiring or an electrode, It can be used to etch copper or copper alloy uniformly and selectively.
- the copper etching solution and etching method of the present invention copper or a copper alloy and other highly conductive metals associated with the manufacture of electrodes, wirings, or bumps of thin film transistors of semiconductor devices and liquid crystal display devices, etc.
- the substrate having the laminated structure it is possible to selectively etch uniform copper or copper alloy with no residue in the fine parts that corrode the electronic members and various laminated films on the substrate.
- selective high precision etching with much higher dimensional controllability than conventional methods is achieved, and the electrical and operational characteristics of the device are improved, thereby improving the performance of various devices such as semiconductor elements. Can be achieved.
- the etching target of the copper etching solution of the present invention is not limited to pure copper, but is a copper alloy. Also good. A copper alloy with a copper content of 50% by weight or more is suitable, and there are no particular restrictions on the alloyed metal in the copper alloy. For example, one type of tin, lead, zinc, nickel, manganese, etc. Or two or more.
- the copper etching solution of the present invention is usually prepared as an aqueous solution containing ammonium oxalate, hydrogen peroxide, a surfactant and water, and optionally an amino acid.
- Ammonium oxalate functions as a complexing agent for dissolving copper as a copper complex, and the concentration in the etching solution is 0.05 to 5% by weight, particularly 1.5 to 4% by weight. preferable. If the concentration of ammonium oxalate is too low, the copper etching becomes non-uniform and a long etching time may be required. Conversely, if the ammonium oxalate concentration is too high, ammonium oxalate can be deposited in the etching apparatus due to the solubility of ammonium oxalate.
- Hydrogen peroxide functions as an oxidizing agent for oxidizing the copper surface, and its concentration is preferably 0.2 to 10% by weight, and particularly preferably 0.5 to 5% by weight. If the concentration of hydrogen peroxide is too low, copper etching may take a long time. On the other hand, if the hydrogen peroxide concentration is too high, there may be problems in terms of safety, such as when the hydrogen peroxide decomposes, there is a rapid exotherm of the etching solution and a large amount of oxygen. Accordingly, hydrogen peroxide is preferably added at the end after mixing other active ingredients and water when preparing the copper etching solution of the present invention.
- concentrations of ammonium oxalate and hydrogen peroxide in the etching solution may be determined by appropriately adjusting the required etching rate within the above range.
- the surface tension of the etching solution is reduced to 45 mNZm or less, whereby the wettability to the substrate surface and the etching solution for the high aspect portion in the substrate structure are reduced.
- the surfactant include an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant.
- anionic, amphoteric and nonionic surfactants are preferred, and anionic and nonionic surfactants are particularly preferred.
- These surfactants may be used singly or in appropriate combination of two or more different types. Above all, the combination of anionic surfactants and nonionic surfactants is It is preferable from the viewpoint of the improvement of the permeability of the chant, the low bubble property, and the decontamination effect.
- anionic surfactant examples include a carboxylic acid type, a sulfonic acid type, a sulfate ester type, and a phosphate ester type.
- amphoteric surfactant examples include an amino acid type and a betaine type. Polyethylene glycol type, polyhydric alcohol type and the like.
- anionic surfactants sulfonic acid type (having one SO-group), sulfuric acid ester
- alkyl sulfonic acids alkyl benzene sulfonic acids, alkyl sulfate esters, alkyl ether sulfates, alkyl carboxylic acids, and salts thereof are preferably used.
- nonionic surfactants polyoxyethylene alkylphenyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters and the like are listed as polyethylene glycol types.
- examples of the polyalkylene glycol type include polyoxyethylene polyoxypropylene ether, polyoxyethylene polyoxybutylene ether, and polyoxyethylene polyoxypropylene alkyl ether.
- examples of the polyhydric alcohol type include glycerin fatty acid ester and sorbitan fatty acid ester.
- polyoxyalkylene (alkyl) ethers are preferably used because they are excellent in chemical stability and decontamination property and are excellent in low foaming property.
- the surfactant concentration in the copper etching solution is preferably from 0.000 to 5% by weight, particularly preferably from 0.001 to 5% by weight. If the surfactant concentration is too low, the penetration of the etching solution by the surfactant and various particle decontamination performances will not be sufficient, and if it is too high, foaming will be noticeable and may not be suitable depending on the etching method. The load when processing the waste liquid may increase.
- the copper etching solution of the present invention is characterized by having a surface tension force of S45 mN / m or less. Thus, sufficient surface wettability is ensured by the small surface tension. .
- the copper etching solution of the present invention may further contain an amino acid such as glycine.
- an amino acid such as glycine.
- the content of the amino acid in the copper etching solution is preferably about 0.2 to 25% by weight, particularly about 1 to about 15% by weight.
- the pH of the copper etching solution of the present invention is 6.0 to 8.5, preferably 6.5 to 8. If the pH of the copper etchant is too low or too high, etching selectivity with coexisting metals may be reduced.
- the pH of the copper etchant can be adjusted using acid and alkali components as necessary.
- the acid component used include organic acids such as acetic acid, and inorganic acids such as hydrochloric acid and nitric acid.
- ammonia water, sodium hydroxide, potassium hydroxide aqueous solution and the like can be used as the alkaline component.
- aqueous ammonia is preferably used as the alkaline component.
- the pH of the copper etching solution it is preferable to adjust the pH of the copper etching solution not only during preparation but also during etching. That is, the force that may cause the pH to fluctuate due to etching If the preferred pH range is escaped, the copper etching selectivity to the coexisting metal may decrease. In particular, when the pH of the copper etching solution is increased, the decomposition rate of hydrogen peroxide as an oxidizing agent is increased, and as a result, the life of the copper etching solution may be shortened.
- the copper etching solution of the present invention contain amino acids, the P H buffer action of amino acids, the variation width of the p H is reduced, since frequently it is not necessary to perform the pH adjustment, very advantageous der The
- etching is performed using such a copper etching solution of the present invention
- insoluble impurities such as fine particles
- uniform etching is performed especially as the pattern size to be etched is reduced. May interfere.
- the filtration method may be a one-pass method, but the circulation method is more preferable from the viewpoint of the fine particle removal efficiency.
- the pore size of the precision filter can be selected as appropriate, but generally it is preferably 0.2 x m or less, particularly preferably 0.1 / im or less.
- the material of the filter is arbitrary as long as it is chemically and physically stable with respect to the etching solution to be filtered, and examples thereof include fluororesin-based materials such as high-density polyethylene and polytetrafluoroethylene / ethylene oxide. . It is preferable that the copper etchant removes insoluble impurities such as fine particles by such a filtration treatment so that the number of fine particles having a diameter of 0.5 ⁇ 1000 ⁇ or more is 1000 particles / ml or less. .
- the etching method using the copper etching solution of the present invention may be performed at room temperature of about 15 to 30 ° C, but the etching solution may be heated for the purpose of improving the etching rate.
- the temperature of the etching solution is preferably 10 to 60 ° C, and more preferably 20 to 50 ° C.
- the etching method of the present invention includes, for example, aluminum, nickel, tin, lead, silver, gold, palladium, or aluminum formed on an insulating substrate made of an organic material such as silicon, glass, alumina, or a polymer resin. It is applied to the etching of copper or copper alloy thin films laminated on a highly conductive metal film such as an alloy mainly composed of one or more of these metals.
- the etching method of the present invention using the copper etching solution of the present invention is arbitrary, and may be performed using a conventionally known apparatus and apparatus used in wet etching.
- a dipping method in which an etching tank is filled with an etching solution and the etching target is immersed may be used.
- etching can be performed more uniformly by swinging the object to be etched or forcibly circulating the etching solution in the tank.
- spray method in which an etching solution is sprayed onto the surface of an etching target
- spin method in which an etching solution is discharged from a nozzle onto a rotating etching target.
- the copper or copper alloy thin film is dissolved and removed by etching, and the metal thin film or substrate under the copper or copper alloy thin film is exposed. Then, after the just etching, over-etching for further etching is performed.
- the overetching time is 5 ° /. More than 200 ° /. Below, especially 10 ° /. It is preferably 100 ° / ⁇ or less.
- the surface tension of the etching solution was measured using a surface tension meter (“CBVP SURFACE TENSIONMETER A3” manufactured by Kyowa Kagaku Co., Ltd.).
- the pH was measured using a pH meter (“D — 24” manufactured by Horiba, Ltd.).
- Example 1 except that the surfactant was not added to the etching solution, the etching solution was prepared in the same manner, and the surface tension and pH were measured in the same manner, while dissolving the metal. A speed evaluation test was conducted and the results are shown in Table 1.
- the etching solution of the present invention contains silver (Ag), nickel (Ni), tin (Sn), tin Z silver (96.5 / 3.5 wt%) alloy (Sn 'Ag) and aluminum (A1) have high etching selectivity, and can selectively etch only copper without attacking these metals. Moreover, it can be seen that the surfactant added to the etching solution does not affect the dissolution rate of copper because the dissolution rate of copper in Comparative Example 1 and Example 1 is the same.
- Solid substrate A positive photoresist resin (thickness of about 1 ⁇ m) is placed on this solid substrate.
- the substrate was pin-coated, and this was patterned by photolithography to create a substrate with a pattern of 5 to 100 ⁇ m lines and spaces (patterned substrate).
- a substrate with this pattern cut to a length of about 50 mm and a width of about 10 mm was used as a sample for evaluation.
- Etching was performed while powering this sample vertically and horizontally in the etchant at the same etchant composition and etchant temperature as in Example 1.
- the just etching time is the time from the etching start point to the end point.
- the end point was determined by visually observing when the metal in the portion to be etched on the substrate was dissolved and the substrate was exposed. Further, the predetermined overetching time was determined by appropriately calculating from the just etching time and the amount etched by overetching (overetching amount).
- Example 2 the etching characteristics were evaluated in the same manner except that the etching solution composition was the same as that in Comparative Example 1, and the results are shown in Table 2.
- the etching solution of the present invention is permeable to fine patterns. It is excellent in that it can perform uniform etching with no residue in the fine part with a small amount of overetching.
- An etching solution was prepared in the same manner as in Example 1 except that the surfactant was not added.
- the surface tension and pH of this etching solution were as shown in Table 3-1.
- the etching solution of the present invention has excellent permeability to fine patterns, and performs uniform etching with no residue in the fine portions with a small amount of overetching. Can do.
- the copper etching solution and etching method of the present invention are used to form a copper or copper alloy thin film element, an electrode wiring element, etc. in the manufacture of semiconductor devices such as semiconductor devices and liquid crystal display devices, printed boards, IC cards, etc. Useful for.
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Abstract
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Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200580046553XA CN101098989A (zh) | 2005-03-29 | 2005-03-29 | 铜的蚀刻液以及蚀刻方法 |
| PCT/JP2005/005976 WO2006103751A1 (ja) | 2005-03-29 | 2005-03-29 | 銅エッチング液及びエッチング方法 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2005/005976 WO2006103751A1 (ja) | 2005-03-29 | 2005-03-29 | 銅エッチング液及びエッチング方法 |
Publications (1)
| Publication Number | Publication Date |
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| WO2006103751A1 true WO2006103751A1 (ja) | 2006-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2005/005976 Ceased WO2006103751A1 (ja) | 2005-03-29 | 2005-03-29 | 銅エッチング液及びエッチング方法 |
Country Status (2)
| Country | Link |
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| CN (1) | CN101098989A (ja) |
| WO (1) | WO2006103751A1 (ja) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010255063A (ja) * | 2009-04-27 | 2010-11-11 | Mitsubishi Materials Corp | 銅または銅合金の組織観察用エッチング液、エッチング方法および組織観察方法 |
| JP2011144377A (ja) * | 2009-06-12 | 2011-07-28 | Asahi Kasei Corp | 酸化銅用エッチング液及びそれを用いた酸化銅用エッチング方法 |
| JP2022184639A (ja) * | 2021-06-01 | 2022-12-13 | 上村工業株式会社 | 銅エッチング液 |
| KR20230125832A (ko) | 2021-01-07 | 2023-08-29 | 샌트랄 글래스 컴퍼니 리미티드 | 웨트 에칭 용액 및 웨트 에칭 방법 |
| CN119081702A (zh) * | 2024-11-06 | 2024-12-06 | 浙江尚能实业股份有限公司 | 一种低表面张力二氧化硅蚀刻液及其制备方法和应用 |
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| JP5710585B2 (ja) * | 2010-02-25 | 2015-04-30 | 旭化成イーマテリアルズ株式会社 | 酸化銅用エッチング液及びそれを用いたエッチング方法 |
| KR20110123025A (ko) * | 2010-05-06 | 2011-11-14 | 삼성전자주식회사 | 금속 배선 식각액 및 이를 이용한 금속 배선 형성 방법 |
| WO2012015089A1 (ko) * | 2010-07-30 | 2012-02-02 | 동우 화인켐 주식회사 | 액정표시장치용 어레이 기판의 제조방법 |
| TWI510848B (zh) * | 2010-08-02 | 2015-12-01 | Dongwoo Fine Chem Co Ltd | 蝕刻劑組成物、蝕刻銅系金屬層之方法及用以製造液晶顯示裝置用之陣列基板的方法 |
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- 2005-03-29 WO PCT/JP2005/005976 patent/WO2006103751A1/ja not_active Ceased
- 2005-03-29 CN CNA200580046553XA patent/CN101098989A/zh active Pending
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010255063A (ja) * | 2009-04-27 | 2010-11-11 | Mitsubishi Materials Corp | 銅または銅合金の組織観察用エッチング液、エッチング方法および組織観察方法 |
| JP2011144377A (ja) * | 2009-06-12 | 2011-07-28 | Asahi Kasei Corp | 酸化銅用エッチング液及びそれを用いた酸化銅用エッチング方法 |
| KR20230125832A (ko) | 2021-01-07 | 2023-08-29 | 샌트랄 글래스 컴퍼니 리미티드 | 웨트 에칭 용액 및 웨트 에칭 방법 |
| JP2022184639A (ja) * | 2021-06-01 | 2022-12-13 | 上村工業株式会社 | 銅エッチング液 |
| US12503775B2 (en) | 2021-06-01 | 2025-12-23 | C. Uyemura & Co., Ltd. | Copper etching solution |
| CN119081702A (zh) * | 2024-11-06 | 2024-12-06 | 浙江尚能实业股份有限公司 | 一种低表面张力二氧化硅蚀刻液及其制备方法和应用 |
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| Publication number | Publication date |
|---|---|
| CN101098989A (zh) | 2008-01-02 |
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