KR102511607B1 - Composision for etching, method for etching and semiconductor device - Google Patents
Composision for etching, method for etching and semiconductor device Download PDFInfo
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- phosphoric acid
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- 238000005530 etching Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000004065 semiconductor Substances 0.000 title claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000000203 mixture Substances 0.000 claims abstract description 54
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 45
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 39
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 39
- 150000003377 silicon compounds Chemical class 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 40
- 229910052814 silicon oxide Inorganic materials 0.000 abstract description 40
- ZJBHFQKJEBGFNL-UHFFFAOYSA-N methylsilanetriol Chemical compound C[Si](O)(O)O ZJBHFQKJEBGFNL-UHFFFAOYSA-N 0.000 description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 8
- 229940089952 silanetriol Drugs 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- -1 hexafluorosilicic acid Chemical compound 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- JTXUAHIMULPXKY-UHFFFAOYSA-N 3-trihydroxysilylpropan-1-amine Chemical compound NCCC[Si](O)(O)O JTXUAHIMULPXKY-UHFFFAOYSA-N 0.000 description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZJPVTOKROCCBOW-UHFFFAOYSA-N 3-trihydroxysilylpropan-1-ol Chemical compound OCCC[Si](O)(O)O ZJPVTOKROCCBOW-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- BHKHFJWRYPNVGQ-UHFFFAOYSA-N acetic acid;trihydroxysilane Chemical compound CC(O)=O.CC(O)=O.CC(O)=O.O[SiH](O)O BHKHFJWRYPNVGQ-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 239000003093 cationic surfactant Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000000572 ellipsometry Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 2
- DEAPYDFKKSUMRV-UHFFFAOYSA-N C(CC[Si](O)(O)O)CC(CO)O Chemical compound C(CC[Si](O)(O)O)CC(CO)O DEAPYDFKKSUMRV-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 125000003668 acetyloxy group Chemical group [H]C([H])([H])C(=O)O[*] 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000004103 aminoalkyl group Chemical group 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229940104869 fluorosilicate Drugs 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 125000005461 organic phosphorous group Chemical group 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- BJIWPUWOQFWNTE-UHFFFAOYSA-N tert-butyl(trihydroxy)silane Chemical compound CC(C)(C)[Si](O)(O)O BJIWPUWOQFWNTE-UHFFFAOYSA-N 0.000 description 1
- 150000005622 tetraalkylammonium hydroxides Chemical class 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- 150000004072 triols Chemical class 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/06—Etching, surface-brightening or pickling compositions containing an inorganic acid with organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Weting (AREA)
Abstract
인산, 그리고
하기 화학식 1 내지 4 중 어느 하나로 표시되는 규소 화합물
을 포함하는 식각 조성물.
[화학식 1]
[화학식 2]
[화학식 3]
[화학식 4]
상기 식각 조성물은 실리콘 질화막과 실리콘 산화막이 혼재 또는 교대로 적층되어 있는 경우, 고온으로 가열된 인산이 상기 실리콘 산화막을 식각하지 못하도록 하면서, 상기 실리콘 질화막을 선택적으로 식각할 수 있으며, 고온으로 가열된 인산으로 식각하는 공정보다 높은 실리콘 질화막과 실리콘 산화막의 선택도를 얻을 수 있어, 디바이스를 구성하는데 효율적이다phosphoric acid, and
A silicon compound represented by any one of the following formulas 1 to 4
Etching composition comprising a.
[Formula 1]
[Formula 2]
[Formula 3]
[Formula 4]
When the silicon nitride film and the silicon oxide film are mixed or alternately stacked, the etching composition can selectively etch the silicon nitride film while preventing the phosphoric acid heated to a high temperature from etching the silicon oxide film, and the phosphoric acid heated to a high temperature Higher selectivity of silicon nitride film and silicon oxide film can be obtained than etching process, so it is efficient to construct a device.
Description
본 발명은 식각 조성물, 식각 방법 및 반도체 소자에 관한 것으로서, 보다 상세하게는 실리콘 질화막과 실리콘 산화막이 혼재 또는 교대로 적층되어 있는 경우, 고온으로 가열된 인산이 상기 실리콘 산화막을 식각하지 못하도록 하면서, 상기 실리콘 질화막을 선택적으로 식각할 수 있으며, 고온으로 가열된 인산으로 식각하는 공정보다 높은 실리콘 질화막과 실리콘 산화막의 선택도를 얻을 수 있어, 디바이스를 구성하는데 효율적인 식각 조성물, 식각 방법 및 반도체 소자에 관한 것이다.The present invention relates to an etching composition, an etching method, and a semiconductor device, and more particularly, when a silicon nitride film and a silicon oxide film are mixed or alternately stacked, while preventing phosphoric acid heated to a high temperature from etching the silicon oxide film, A silicon nitride film can be selectively etched, and a higher selectivity between a silicon nitride film and a silicon oxide film can be obtained than a process of etching with phosphoric acid heated to a high temperature. .
기존의 실리콘 질화막의 습식 식각을 위해서는 150 내지 170℃로 가열된 인산을 이용하여 실리콘 질화막을 습식 식각하여 왔다. 하지만, 종래의 방법으로는 실리콘 질화막과 실리콘 산화막이 교대로 적층되어 있을 경우 실리콘 질화막과 실리콘 산화막의 선택비가 낮아 디바이스의 구성에 저해요소가 되어 왔다. In order to wet-etch a conventional silicon nitride film, the silicon nitride film has been wet-etched using phosphoric acid heated to 150 to 170°C. However, in the conventional method, when a silicon nitride film and a silicon oxide film are alternately stacked, the selectivity between the silicon nitride film and the silicon oxide film is low, which has been an obstacle to the device configuration.
실리콘 산화막의 데미지(damage)를 억제하는 방법으로서 규소를 용해한 고순도 인산 또는 헥사 플루오르 규산을 첨가한 인산이 제안되어 있다(특허 문헌 1 내지 3 참조). 그러나, 헥사 플루오르 규산을 첨가한 경우 식각 조성물로부터 불용성의 규소 화합물의 석출이 빨라지기 때문에 산화 규소의 데미지를 충분히 줄일 정도로 헥사 플루오르 규산을 첨가할 수 없고, 공업적에 사용하기에는 문제가 있다.As a method of suppressing damage to a silicon oxide film, high-purity phosphoric acid in which silicon is dissolved or phosphoric acid in which hexafluorosilicic acid is added have been proposed (see Patent Documents 1 to 3). However, when hexafluorosilicic acid is added, precipitation of an insoluble silicon compound from the etching composition is accelerated, so that hexafluorosilicic acid cannot be added enough to sufficiently reduce the damage of silicon oxide, and there is a problem in industrial use.
또한, 100℃ 이하의 온도로 질화 규소를 에칭하는 방법으로서 인산, 불화 수소산, 질산으로 되는 식각 조성물에 플루오르 규산 또는 플루오르 규산염을 첨가하는 방법이 개시되어 있다. 그러나, 인산에 불화 수소산 및 질산을 첨가한 식각 조성물에서는 다른 반도체 재료인 실리콘 산화막의 데미지가 크고, 반도체 프로세스에 이용하기에는 문제가 있다. 특별히 인산에 불화 수소산 및 질산을 더한 조성물을 고온으로 이용하는 경우 악영향이 더욱 현저하다.In addition, as a method of etching silicon nitride at a temperature of 100° C. or less, a method of adding fluorosilicic acid or fluorosilicate to an etching composition composed of phosphoric acid, hydrofluoric acid, or nitric acid is disclosed. However, in the etching composition in which hydrofluoric acid and nitric acid are added to phosphoric acid, damage to a silicon oxide film, which is another semiconductor material, is great, and there is a problem in using it in a semiconductor process. In particular, when a composition obtained by adding hydrofluoric acid and nitric acid to phosphoric acid is used at a high temperature, the adverse effect is more remarkable.
지금까지 실리콘 산화막에 데미지를 주지 않으면서 실리콘 질화막을 선택적으로 식각할 수 있는 공업으로 만족할 수 있는 식각 조성물은 없었다.Until now, there has been no etching composition satisfactory for the industry that can selectively etch a silicon nitride film without causing damage to the silicon oxide film.
본 발명의 목적은 실리콘 질화막과 실리콘 산화막이 혼재 또는 교대로 적층되어 있는 경우, 고온으로 가열된 인산이 상기 실리콘 산화막을 식각하지 못하도록 하면서, 상기 실리콘 질화막을 선택적으로 식각할 수 있으며, 고온으로 가열된 인산으로 식각하는 공정보다 높은 실리콘 질화막과 실리콘 산화막의 선택도를 얻을 수 있어, 디바이스를 구성하는데 효율적인 식각 조성물을 제공하는 것이다.An object of the present invention is to selectively etch the silicon nitride film while preventing phosphoric acid heated to a high temperature from etching the silicon oxide film when a silicon nitride film and a silicon oxide film are mixed or alternately stacked, It is to provide an etching composition that is efficient in constructing a device by obtaining a higher selectivity between a silicon nitride film and a silicon oxide film than a process of etching with phosphoric acid.
본 발명의 다른 목적은 상기 식각 조성물을 이용하는 식각 방법을 제공하는 것이다.Another object of the present invention is to provide an etching method using the etching composition.
본 발명의 또 다른 목적은 상기 식각 조성물을 이용하여 제조된 반도체 소자를 제공하는 것이다.Another object of the present invention is to provide a semiconductor device manufactured using the etching composition.
본 발명의 일 실시예에 따른 식각 조성물은 인산, 그리고 하기 화학식 1 내지 4 중 어느 하나로 표시되는 규소 화합을 포함한다.An etching composition according to an embodiment of the present invention includes phosphoric acid and a silicon compound represented by any one of Chemical Formulas 1 to 4 below.
[화학식 1][Formula 1]
[화학식 2][Formula 2]
[화학식 3][Formula 3]
[화학식 4][Formula 4]
상기 식각 조성물은 상기 식각 조성물 전체에 대하여 상기 인산 7 내지 85 중량%, 상기 규소 화합물 0.1 내지 3 중량% 및 나머지 함량의 용매를 포함할 수 있다.The etching composition may include 7 to 85% by weight of the phosphoric acid, 0.1 to 3% by weight of the silicon compound, and the rest of the solvent, based on the total weight of the etching composition.
본 발명의 다른 일 실시예에 따른 식각 방법은 상기 식각 조성물을 이용하여 실리콘 질화막, 실리콘 산화막 및 이들의 조합으로 이루어진 군에서 선택되는 어느 하나를 식각하는 단계를 포함한다.An etching method according to another embodiment of the present invention includes etching any one selected from the group consisting of a silicon nitride film, a silicon oxide film, and a combination thereof using the etching composition.
본 발명의 또 다른 일 실시예에 따른 반도체 소자는 상기 식각 방법에 의하여 제조된다.A semiconductor device according to another embodiment of the present invention is manufactured by the above etching method.
본 발명에 따른 식각 조성물은 실리콘 질화막과 실리콘 산화막이 혼재 또는 교대로 적층되어 있는 경우, 고온으로 가열된 인산이 상기 실리콘 산화막을 식각하지 못하도록 하면서, 상기 실리콘 질화막을 선택적으로 식각할 수 있으며, 고온으로 가열된 인산으로 식각하는 공정보다 높은 실리콘 질화막과 실리콘 산화막의 선택도를 얻을 수 있어, 디바이스를 구성하는데 효율적이다.The etching composition according to the present invention can selectively etch the silicon nitride film while preventing phosphoric acid heated to a high temperature from etching the silicon oxide film when the silicon nitride film and the silicon oxide film are mixed or alternately stacked. It is possible to obtain a higher selectivity of the silicon nitride film and the silicon oxide film than the process of etching with heated phosphoric acid, so it is efficient to construct a device.
이하, 본 발명에 대하여 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명의 일 실시예에 따른 식각 조성물은 인산, 그리고 하기 화학식 1로 표시되는 규소 화합물을 포함한다.An etching composition according to an embodiment of the present invention includes phosphoric acid and a silicon compound represented by Formula 1 below.
[화학식 1][Formula 1]
상기 화학식 1에서, 상기 R1 내지 R3는 각각 독립적으로 수소, 히드록시기, 탄소수 1 내지 20의 알킬기, 탄소수 1 내지 20의 아미노 알킬기, 탄소수 1 내지 20의 알콕시기, 아세틸옥시기 및 탄소수 1 내지 20의 할로알킬아세틸옥시기로 이루어진 군에서 선택되며, 단 R1 내지 R3이 동시에 히드록시기는 아니다. In Formula 1, R 1 to R 3 are each independently hydrogen, a hydroxyl group, an alkyl group having 1 to 20 carbon atoms, an amino alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an acetyloxy group, and a carbon number 1 to 20 group. It is selected from the group consisting of a haloalkylacetyloxy group, provided that R 1 to R 3 are not hydroxyl groups at the same time.
상기 규소 화합물은 규소와 히드록시기를 포함하는 화합물로서, 상기 화학식 1로 표시되는 규소 화합물은 중심 원자인 규소에 직접적으로 결합하는 하이드록시기를 포함함에 따라 고온으로 가열된 인산이 상기 실리콘 산화막을 식각하는 것을 예방할 수 있다.The silicon compound is a compound containing silicon and a hydroxyl group, and since the silicon compound represented by Chemical Formula 1 includes a hydroxyl group directly bonded to silicon as a central atom, phosphoric acid heated to a high temperature prevents etching of the silicon oxide film. It can be prevented.
상기 규소 화합물은 구체적으로 실란트리올, 3-아미노프로필실란트리올, 1-메틸실란트리올, 2-메틸-2-프로파닐실란트리올, 트리아세테이트 실란트리올(cas No.4253-34-3), 3-(2,3-다이아이드록시프로필)프로필실란트리올, 2-(클로로에틸)트리아세테이트 실란트리올(Cas No. 38013-53-5), 3-(하이드록시프로필)실란트리올 및 이들의 조합으로 이루어진 군에서 선택되는 어느 하나일 수 있고, 바람직하게 실란트리올계 화합물일 수 있다. 상기 화학식 1로 표시되는 규소 화합물이 실란트리올계 화합물인 경우 모노 또는 다이올인 경우 보다 실리콘 산화막의 식각 속도가 실리콘트리올계 화합물 보다 느려 실리콘 질화막과 실리콘 산화막의 고선택비를 얻을 수 있다.The silicon compound is specifically silanetriol, 3-aminopropylsilanetriol, 1-methylsilanetriol, 2-methyl-2-propanylsilanetriol, triacetate silanetriol (cas No. 4253-34- 3), 3-(2,3-dihydroxypropyl)propylsilanetriol, 2-(chloroethyl)triacetate silanetriol (Cas No. 38013-53-5), 3-(hydroxypropyl)silane It may be any one selected from the group consisting of triols and combinations thereof, and may preferably be silanetriol-based compounds. When the silicon compound represented by Chemical Formula 1 is a silanetriol-based compound, the etching rate of the silicon oxide film is slower than that of the silicon triol-based compound compared to the case of a mono- or diol-based compound, and a high selectivity between the silicon nitride film and the silicon oxide film can be obtained.
상기 식각 조성물은 상기 식각 조성물 전체에 대하여 상기 인산 7 내지 85 중량%, 상기 규소 화합물 0.1 내지 3 중량% 및 나머지 함량의 용매를 포함할 수 있다. 상기 식각 조성물에서 상기 인산의 함량이 7 중량% 미만인 경우 실리콘 질화막의 식각이 현저히 줄어들 수 있고, 상기 인산의 함량이 85 중량%를 초과하는 경우 인산의 끓는점이 높아 식각 장비에 좋지 않은 영향을 줄 수 있다. 또한, 상기 식각 조성물에서 상기 규소 화합물의 함량이 0.1 중량% 미만인 경우 실리콘 산화막의 식각 속도가 빨라 원하는 선택비를 구현하지 못할 수 있으며, 상기 규소 화합물의 함량이 3 중량%를 초과하는 경우 실리콘 질화막의 식각 속도까지 줄어들 수 있다.The etching composition may include 7 to 85% by weight of the phosphoric acid, 0.1 to 3% by weight of the silicon compound, and the rest of the solvent, based on the total weight of the etching composition. When the phosphoric acid content in the etching composition is less than 7% by weight, etching of the silicon nitride film may be significantly reduced, and when the phosphoric acid content exceeds 85% by weight, the boiling point of phosphoric acid is high, which may adversely affect etching equipment. there is. In addition, when the content of the silicon compound in the etching composition is less than 0.1% by weight, the etching rate of the silicon oxide film is fast, and a desired selectivity may not be realized, and when the content of the silicon compound exceeds 3% by weight, the silicon nitride film The etching rate may also be reduced.
상기 식각 조성물은 상기 인산 및 상기 규소 화합물 이외에 나머지 함량의 용매를 더 포함할 수 있다. 상기 용매는 물일 수 있으나, 본 발명이 이에 한정되는 것은 아니다.The etching composition may further include a remaining solvent in addition to the phosphoric acid and the silicon compound. The solvent may be water, but the present invention is not limited thereto.
상기 식각 조성물은 금속 배선의 보호를 위하여 필요에 따라 트리아졸류, 이미다졸류, 티올 화합물 등의 부식 방지제를 더 포함할 수 있다.The etching composition may further include a corrosion inhibitor such as triazoles, imidazoles, and thiol compounds as needed to protect the metal wiring.
상기 식각 조성물은 pH 조절을 위하여 필요에 따라 알칼리성 화합물 또는 상기 인산 이외의 산을 더 첨가할 수 있다. 상기 알칼리성 화합물은 암모니아, 아민 또는 테트라 알킬 암모늄 수산화물, 함질소 복소환식 화합물일 수 있다. 상기 인산 이외의 산은 규산, 불산, 붕산, 염산, 황산, 질산, 과염소산 등의 무기산 또는 카르본산, 유기 아인산, 유기 술폰산 등의 유기산을 들 수 있다.The etching composition may further add an alkaline compound or an acid other than the phosphoric acid, if necessary, to adjust the pH. The alkaline compound may be ammonia, amine or tetraalkyl ammonium hydroxide, or a nitrogen-containing heterocyclic compound. Examples of acids other than phosphoric acid include inorganic acids such as silicic acid, hydrofluoric acid, boric acid, hydrochloric acid, sulfuric acid, nitric acid, and perchloric acid, and organic acids such as carboxylic acid, organic phosphorous acid, and organic sulfonic acid.
또한, 상기 식각 조성물은 식각된 잔사를 제거하기 위하여 필요에 따라 계면활성제를 더 포함할 수 있다. 상기 계면활성제로는 음이온성 계면활성제, 양이온성 계면활성제 또는 비이온성 계면활성제를 모두 사용할 수 있다. 상기 양이온성 계면활성제로는 C8H17NH2 등의 아민류를 들 수 있고, 상기 음이온성 계면활성제로는 C8H17COOH 등의 탄화수소계 카르복시산, C8H17SO3H 등의 탄화수소계 술폰산, H(CF2)6COOH 등의 불소계 카르복시산을 들 수 있고, 비이온성 계면활성제로는 폴리옥시알킬렌알킬에테르 등의 에테르류를 들 수 있다.In addition, the etching composition may further include a surfactant as needed to remove etched residues. As the surfactant, anionic surfactants, cationic surfactants, or nonionic surfactants may all be used. Examples of the cationic surfactant include amines such as C 8 H 17 NH 2 , and examples of the anionic surfactant include hydrocarbon-based carboxylic acids such as C 8 H 17 COOH and hydrocarbon-based compounds such as C 8 H 17 SO 3 H and fluorine-based carboxylic acids such as sulfonic acid and H(CF 2 ) 6 COOH, and examples of the nonionic surfactant include ethers such as polyoxyalkylene alkyl ether.
상기 식각 조성물은 상기 실리콘 산화막에 대한 상시 실리콘 질화막의 식각 선택도를 실란트리올의 함량을 통해 조절이 가능하다.In the etching composition, the etching selectivity of the silicon nitride layer relative to the silicon oxide layer can be adjusted through the content of silanetriol.
상기 실리콘 산화막에 대한 상기 실리콘 질화막의 식각 선택도는 상기 실리콘 산화막의 식각 속도에 대한 상기 실리콘 질화막 식각 속도의 비로서, 하기 수학식 1에 의하여 계산할 수 있다.The etch selectivity of the silicon nitride layer with respect to the silicon oxide layer is a ratio of the etching rate of the silicon nitride layer to the etching rate of the silicon oxide layer, and can be calculated by Equation 1 below.
[수학식 1][Equation 1]
상기 수학식 1에서, A는 실리콘 산화막의 식각 속도, B는 실리콘 질화막 식각 속도, C는 선택도이다.In Equation 1, A is the etching rate of the silicon oxide layer, B is the etching rate of the silicon nitride layer, and C is the selectivity.
본 발명의 다른 일 실시예에 따른 식각 방법은 상기 식각 조성물을 이용하여 실리콘 질화막, 실리콘 산화막 및 이들의 조합으로 이루어진 군에서 선택되는 어느 하나를 식각하는 단계를 포함한다.An etching method according to another embodiment of the present invention includes etching any one selected from the group consisting of a silicon nitride film, a silicon oxide film, and a combination thereof using the etching composition.
상기 식각 조성물은 상기 화학식 1로 표시되는 규소 화합물을 포함함에 따라 고온으로 가열된 인산이 상기 실리콘 산화막을 식각하는 것을 예방할 수 있어 상기 실리콘 질화막을 선택적으로 식각할 수 있다.Since the etching composition includes the silicon compound represented by Formula 1, phosphoric acid heated to a high temperature can prevent the silicon oxide layer from being etched, and thus the silicon nitride layer can be selectively etched.
상기 식각 방법은 구체적으로 상기 실리콘 질화막 또는 상기 실리콘 산화막을 기판 위에 형성하고, 상기 식각액 조성물을 상기 실리콘 질화막 또는 상기 실리콘 산화막에 가한 후, 식각이 완료되면 상기 식각액 조성물을 제거할 수 있다.The etching method may specifically form the silicon nitride film or the silicon oxide film on a substrate, apply the etchant composition to the silicon nitride film or the silicon oxide film, and then remove the etchant composition when the etching is completed.
상기 기판은 바람직하게 반도체 웨이퍼일 수 있으나, 본 발명이 이에 한정되는 것은 아니고, 본 발명의 기술 분야에서 통상적으로 사용되는 기판은 어느 것이나 사용 가능하다.The substrate may preferably be a semiconductor wafer, but the present invention is not limited thereto, and any substrate commonly used in the technical field of the present invention may be used.
상기 실리콘 질화막 또는 상기 실리콘 산화막에 상기 식각 조성물을 가하는 방법은 상기 실리콘 질화막 또는 상기 실리콘 산화막을 제거할 수 있는 방법이면 특별히 제한되지 않으며, 예를 들면 도포, 침적, 분무 또는 분사 등의 방법일 수 있고, 특히 경시적인 조성 변화가 적고 식각 속도의 변화가 적다는 장점이 있는 침적하는 방법(배치식 장치) 또는 분사하는 방법(매엽식 장치)을 바람직하게 이용할 수 있다.The method of applying the etching composition to the silicon nitride film or the silicon oxide film is not particularly limited as long as it can remove the silicon nitride film or the silicon oxide film, and may be, for example, coating, deposition, spraying, or spraying. In particular, a deposition method (batch-type device) or a spraying method (sheet-wafer type device), which has the advantage of a small change in composition over time and a small change in etching rate, can be preferably used.
상기 식각 조성물의 적용 온도는 150 내지 200℃, 바람직하게는 155℃ 내지 170℃일 수 있다. 상기 온도 범위 내에서 상기 식각 조성물을 상기 기판에 적용함으로써, 상기 실리콘 산화막 또는 상기 실리콘 질화막을 선택적으로 식각할 수 있다. The application temperature of the etching composition may be 150 to 200 ℃, preferably 155 ℃ to 170 ℃. By applying the etching composition to the substrate within the temperature range, the silicon oxide layer or the silicon nitride layer may be selectively etched.
이후, 상기 식각 이후 상기 식각 조성물은 초순수 등으로 제거한 후, 상기 실리콘 산화막 또는 상기 실리콘 질화막을 건조한다.Then, after the etching, the etching composition is removed with ultrapure water, etc., and then the silicon oxide layer or the silicon nitride layer is dried.
본 발명의 또 다른 일 실시예에 따른 반도체 소자는 상기 식각 조성물을 이용하는 식각 방법에 의하여 제조된다. 상기 반도체 소자의 종류는 본 발명에서 특별히 한정되지 않는다. A semiconductor device according to another embodiment of the present invention is manufactured by an etching method using the etching composition. The type of the semiconductor device is not particularly limited in the present invention.
이하, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 본 발명의 실시예에 대하여 상세히 설명한다. 그러나 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다.Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.
[제조예: 식각 조성물의 제조][Production Example: Preparation of Etching Composition]
하기 표 1에 기재된 바와 같이 배합을 달리하면서 실시예 및 비교예의 식각 조성물을 각각 제조하였고, 제조된 식각 조성물을 식각 온도를 달리하면서 실리콘 질화막 및 실리콘 산화막이 형성된 기판에 가하여 식각을 진행하였다. As shown in Table 1 below, etching compositions of Examples and Comparative Examples were prepared while varying the formulation, and etching was performed by applying the prepared etching composition to a substrate on which a silicon nitride film and a silicon oxide film were formed while varying an etching temperature.
구체적으로, 실시예 1은 인산 및 실란트리올, 실시예 2는 인산 및 3-아미노프로필실란트리올, 실시예 3은 인산 및 1-메틸실란트리올, 실시예 4는 인산 및 트리아세테이트 실란트리올, 실시예 5는 인산 및 (3-하이드록시프로필)실란트리올을 혼합하여 식각 조성물을 제조하였다.Specifically, Example 1 is phosphoric acid and silanetriol, Example 2 is phosphoric acid and 3-aminopropylsilanetriol, Example 3 is phosphoric acid and 1-methylsilanetriol, Example 4 is phosphoric acid and triacetate silanetriol In Example 5, an etching composition was prepared by mixing phosphoric acid and (3-hydroxypropyl)silanetriol.
한편,비교예 1 및 2는 인산만으로 이루어진 식각 조성물이되, 식각 온도만을 달리한 경우이고, 비교예 3은 인산 및 테트라에톡시실란(TEOS)를 혼합하여 제조된 식각 조성물이다.Meanwhile, Comparative Examples 1 and 2 are etching compositions comprising only phosphoric acid, but only the etching temperature is varied, and Comparative Example 3 is an etching composition prepared by mixing phosphoric acid and tetraethoxysilane (TEOS).
또한, 상기 제조된 식각 조성물의 식각 속도 및 선택도를 측정하였고, 그 결과도 하기 표 1에 정리하였다. 구체적으로, 비이커에 상기 제조된 식각 조성물을 투입하여 157℃ 내지 165℃ 온도에 도달했을 때 실리콘 질화막 및 실리콘 산화막이 형성된 기판을 상기 가열된 식각 조성물에 각각 20분 동안 침지하여 식각 속도 및 선택도를 측정하였다.In addition, the etching rate and selectivity of the prepared etching composition were measured, and the results are also summarized in Table 1 below. Specifically, when the prepared etching composition is added to a beaker and the temperature reaches 157° C. to 165° C., the substrate on which the silicon nitride film and the silicon oxide film are formed is immersed in the heated etching composition for 20 minutes, respectively, to increase the etching rate and selectivity. measured.
상기 식각 속도는 엘립소미트리(Nano-View, SE-MG-1000; Ellipsometery)를 이용하여 실리콘 질화막 및 실리콘 산화막의 두께를 측정함으로써 결정하였다.The etch rate was determined by measuring the thickness of the silicon nitride film and the silicon oxide film using an ellipsometry (Nano-View, SE-MG-1000; Ellipsometry).
(질화막/산화막)selectivity
(Nitride/Oxide)
+TEOS(0.75 중량%)Phosphoric acid (85% by weight aqueous solution)
+TEOS (0.75% by weight)
+실란트리올(0.75 중량%)Phosphoric acid (85% by weight aqueous solution)
+ Silanetriol (0.75% by weight)
+3-아미노프로필 실란트리올(3 중량%)Phosphoric acid (85% by weight aqueous solution)
+3-aminopropyl silanetriol (3% by weight)
+1-메틸 실란트리올(2 중량%)Phosphoric acid (85% by weight aqueous solution)
+1-Methyl Silanetriol (2% by weight)
+트리아세테이트 실란트리올(0.75 중량%)Phosphoric acid (85% by weight aqueous solution)
+triacetate silanetriol (0.75% by weight)
+(3-히드록시프로필) 실란트리올(1.5 중량%)Phosphoric acid (85% by weight aqueous solution)
+ (3-hydroxypropyl) silanetriol (1.5% by weight)
상기 표 1을 참조하면, 실시예에서 제조된 식각 조성물이 비교예에서 제조된 식각 조성물에 비하여 선택도가 매우 향상되는 것을 알 수 있다. 이는 실시예에서 제조된 식각 조성물의 경우 상기 화학식 1로 표시되는 규소 화합물을 포함함에 따라 중심 원자인 규소에 직접적으로 결합하는 하이드록시기가 고온으로 가열된 인산이 상기 실리콘 산화막을 식각하는 것을 예방할 수 있기 때문인 것으로 생각된다.이상에서 본 발명의 바람직한 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것은 아니고 다음의 청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 형태 또한 본 발명의 권리범위에 속하는 것이다.Referring to Table 1, it can be seen that the selectivity of the etching composition prepared in Example is significantly improved compared to the etching composition prepared in Comparative Example. This is because, in the case of the etching composition prepared in Example, since the silicon compound represented by Formula 1 is included, phosphoric acid heated to a high temperature can prevent the silicon oxide film from being etched by a hydroxyl group directly bonded to silicon, which is a central atom. Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and modifications of those skilled in the art using the basic concept of the present invention defined in the following claims Modified forms also fall within the scope of the present invention.
Claims (4)
하기 화학식 4로 표시되는 규소 화합물
을 포함하는 식각 조성물.
[화학식 4]
phosphoric acid, and
A silicon compound represented by the following formula (4)
Etching composition comprising a.
[Formula 4]
상기 식각 조성물은 상기 식각 조성물 전체에 대하여 상기 인산 7 내지 85 중량%, 상기 규소 화합물 0.1 내지 3 중량% 및 나머지 함량의 용매를 포함하는 것인 식각 조성물.According to claim 1,
The etching composition is an etching composition comprising 7 to 85% by weight of the phosphoric acid, 0.1 to 3% by weight of the silicon compound, and the rest of the solvent with respect to the entirety of the etching composition.
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