JP2018182103A - エッチング方法 - Google Patents
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- JP2018182103A JP2018182103A JP2017080798A JP2017080798A JP2018182103A JP 2018182103 A JP2018182103 A JP 2018182103A JP 2017080798 A JP2017080798 A JP 2017080798A JP 2017080798 A JP2017080798 A JP 2017080798A JP 2018182103 A JP2018182103 A JP 2018182103A
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- 238000000034 method Methods 0.000 title claims abstract description 164
- 238000005530 etching Methods 0.000 title claims abstract description 62
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 40
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 347
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims description 43
- 238000010926 purge Methods 0.000 claims description 36
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 26
- 150000002500 ions Chemical class 0.000 claims description 15
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 15
- 125000003277 amino group Chemical group 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 229910003902 SiCl 4 Inorganic materials 0.000 claims description 12
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 12
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 10
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 7
- 125000004429 atom Chemical group 0.000 claims description 5
- 229910052801 chlorine Inorganic materials 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 125000001153 fluoro group Chemical group F* 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 3
- 239000010408 film Substances 0.000 description 185
- 239000010410 layer Substances 0.000 description 124
- 239000000463 material Substances 0.000 description 24
- 239000011261 inert gas Substances 0.000 description 12
- 239000003507 refrigerant Substances 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 10
- 239000010703 silicon Substances 0.000 description 9
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000002243 precursor Substances 0.000 description 7
- 238000000231 atomic layer deposition Methods 0.000 description 6
- 238000000151 deposition Methods 0.000 description 6
- 230000008021 deposition Effects 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- 101001090150 Equus caballus Sperm histone P2a Proteins 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 229910001882 dioxygen Inorganic materials 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- 101001016600 Equus caballus Sperm histone P2b Proteins 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 229910052756 noble gas Inorganic materials 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- VRAIHTAYLFXSJJ-UHFFFAOYSA-N alumane Chemical compound [AlH3].[AlH3] VRAIHTAYLFXSJJ-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- VEDJZFSRVVQBIL-UHFFFAOYSA-N trisilane Chemical compound [SiH3][SiH2][SiH3] VEDJZFSRVVQBIL-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
Claims (14)
- 被処理体に対するエッチング方法であって、該被処理体は支持基体と被処理層とを備え、該被処理層は該支持基体の主面に設けられ複数の凸領域を備え、該複数の凸領域のそれぞれは該主面の上方に延びており、該複数の凸領域のそれぞれの端面は該主面上から見て露出しており、当該方法は、
前記複数の凸領域のそれぞれの前記端面に膜を形成する第1の工程と、
前記第1の工程によって形成された前記膜を異方性エッチングし、一または複数の前記端面を選択的に露出させる第2の工程と、
前記第2の工程によって露出された前記端面を原子層毎に異方性エッチングする第3の工程と、
を備え、
前記被処理層は、シリコン窒化物を含み、
前記膜は、シリコン酸化物を含む、
被処理体に対するエッチング方法。 - 前記膜は、第1の膜および第2の膜を含み、
前記第1の工程は、
前記第1の膜をコンフォーマルに形成する第4の工程と、
前記第1の膜上に第2の膜を形成する第5の工程と、
を備え、
前記第5の工程は、
前記主面から離れる程に、膜厚が増加するように、前記第2の膜を形成する、
請求項1に記載の方法。 - 前記第4の工程は、
前記被処理体が配置される空間に第1のガスを供給する第6の工程と、
前記第6の工程の実行後に前記被処理体が配置される空間をパージする第7の工程と、
前記第7の工程の実行後に前記被処理体が配置される空間に第2のガスのプラズマを生成する第8の工程と、
前記第8の工程の実行後に前記被処理体が配置される空間をパージする第9の工程と、
を含む第1のシーケンスを繰り返し実行して前記第1の膜をコンフォーマルに形成し、
前記第1のガスは、有機含有のアミノシラン系ガスを含み、
前記第2のガスは、酸素原子を含み、
前記第6の工程は、前記第1のガスのプラズマを生成しない、
請求項2に記載の方法。 - 前記第1のガスは、モノアミノシランを含む、
請求項3に記載の方法。 - 前記第1のガスに含まれるアミノシラン系ガスは、1〜3個のケイ素原子を有するアミノシランを含む、
請求項3に記載の方法。 - 前記第1のガスに含まれるアミノシラン系ガスは、1〜3個のアミノ基を有するアミノシランを含む、
請求項3または請求項5に記載の方法。 - 前記第5の工程は、
前記被処理体が配置される空間に第3のガスのプラズマを生成し、
前記第3のガスは、シリコン原子を含み、且つ、塩素原子または水素原子を含む、
請求項2〜6の何れか一項に記載の方法。 - 前記第3のガスは、SiCl4ガスまたはSiH4ガスを含む、
請求項7に記載の方法。 - 前記第5の工程は、
前記被処理体が配置される空間に第4のガスを供給する第10の工程と、
前記第10の工程の実行後に前記被処理体が配置される空間をパージする第11の工程と、
前記第11の工程の実行後に前記被処理体が配置される空間に第5のガスのプラズマを生成する第12の工程と、
前記第12の工程の実行後に前記被処理体が配置される空間をパージする第13の工程と、
を含む第2のシーケンスを繰り返し実行して前記第2の膜を形成し、
前記第4のガスは、シリコン原子および塩素原子を含み、
前記第5のガスは、酸素原子を含み、
前記第10の工程は、前記第4のガスのプラズマを生成しない、
請求項2〜6の何れか一項に記載の方法。 - 前記第4のガスは、SiCl4ガスおよびArガスを含む混合ガスを含む、
請求項9に記載の方法。 - 前記第2の工程は、
前記被処理体が配置される空間に第6のガスのプラズマを生成し、該第6のガスのプラズマにバイアス電力を印加し、
前記第6のガスは、フルオロカーボン系ガスを含む、
請求項1〜10の何れか一項に記載の方法。 - 前記第3の工程は、
前記被処理体が配置される空間に第7のガスのプラズマを生成し、該第7のガスのプラズマに含まれるイオンを含む混合層を、前記第2の工程によって露出された前記端面の原子層に形成する第14の工程と、
前記第14の工程の実行後に前記被処理体が配置される空間をパージする第15の工程と、
前記第15の工程の実行後に前記被処理体が配置される空間に第8のガスのプラズマを生成し、該第8のガスのプラズマに含まれるラジカルによって前記混合層を除去する第16の工程と、
前記第16の工程の実行後に前記被処理体が配置される空間をパージする第17の工程と、
を含む第3のシーケンスを繰り返し実行し、前記第2の工程によって露出された前記端面を原子層毎に除去することによって、当該端面に対して選択的に異方性エッチングを行い、
前記第7のガスは、水素原子または酸素原子を含み、
前記第8のガスは、フッ素原子を含む、
請求項1〜11の何れか一項に記載の方法。 - 前記第14の工程において、前記第7のガスのプラズマにバイアス電力を印加して、前記第2の工程によって露出された前記端面の原子層に前記イオンを含む前記混合層を形成する、
請求項12に記載の方法。 - 前記第8のガスは、NF3ガスおよびO2ガスを含む混合ガスを含む、
請求項12または請求項13に記載の方法。
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