JP2019009189A - エッチング方法 - Google Patents
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- JP2019009189A JP2019009189A JP2017121596A JP2017121596A JP2019009189A JP 2019009189 A JP2019009189 A JP 2019009189A JP 2017121596 A JP2017121596 A JP 2017121596A JP 2017121596 A JP2017121596 A JP 2017121596A JP 2019009189 A JP2019009189 A JP 2019009189A
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- 238000005530 etching Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 80
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 24
- 239000010703 silicon Substances 0.000 claims abstract description 24
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 121
- 238000004380 ashing Methods 0.000 claims description 23
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 5
- 229910001882 dioxygen Inorganic materials 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 51
- 238000001312 dry etching Methods 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 48
- 229910052814 silicon oxide Inorganic materials 0.000 description 48
- 230000000052 comparative effect Effects 0.000 description 10
- 239000003507 refrigerant Substances 0.000 description 9
- 239000000758 substrate Substances 0.000 description 8
- 230000007547 defect Effects 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002221 fluorine Chemical class 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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- 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
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- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
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- 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
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- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
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Abstract
Description
まず、プラズマ処理装置1の一例について、図1を参照しながら説明する。本実施形態にかかるプラズマ処理装置1は、容量結合型の平行平板プラズマ処理装置であり、略円筒形の処理容器(チャンバ)2を有している。処理容器2の内面には、アルマイト処理(陽極酸化処理)が施されている。処理容器2の内部は、プラズマによりエッチング処理や成膜処理等のプラズマ処理が行われる処理室となっている。
図2を参照して、エッチング時のボーイングの発生について説明する。図2(a)に一例を示す初期状態から、シリコン酸化膜51を、シリコン酸化膜上のマスク52のパターンにプラズマエッチング(メインエッチング)する。エッチング工程では、図2(b)に示すように、エッチングにより生じる反応生成物53が、シリコン酸化膜51とマスク52との界面の開口部54の付近やマスク52の上面及び側面に付着する。
以下では、本実施形態に係るプラズマ処理装置1を用いて実行されるエッチング処理について、図3及び図4を用いて説明する。図3は、一実施形態に係るエッチング処理の一例を示すフローチャートである。図3に示すエッチング処理の制御は、RAM115に記憶されたレシピに基づき、制御装置100のCPU105によって行われる。
マスク52はカーボンであってもよいし、有機膜であってもよい。
エッチング工程(第1の工程)で使用する第1のガスは、フルオロカーボンガスを含むガスに限らず、ハイドロフルオロカーボンガスを含むガスであってもよい。第1のガスとしては、例えば、C4F6ガス、C4F8ガス、CF4ガス、CHF3ガス、CH2F2ガスが挙げられる。また、第1のガスは、フルオロカーボンガス及びハイドロフルオロカーボンガスの少なくともいずれかとO2ガスとArガス等の不活性ガスとを含んだ混合ガスであってもよい。
最後に、本実施形態に係るエッチング処理の効果について、図5を参照しながら説明する。図5は、一実施形態に係るエッチング方法による形状を比較例と比較した結果の一例を示す。
2 処理容器(チャンバ)
3 ステージ
10 静電チャック
10a チャック電極
11 フォーカスリング
12 支持体
12a 冷媒流路
17 ゲートバルブ
20 ガスシャワーヘッド
21 シールドリング
22 ガス導入口
23 ガス供給源
24a、24b ガス拡散室
25 ガス供給孔
26 可変直流電源
30 直流電源
31 スイッチ
32 第1高周波電源
33 第1整合器
34 第2高周波電源
35 第2整合器
36 チラー
37 伝熱ガス供給源
38 排気装置
51 シリコン酸化膜
52 マスク
53 反応生成物
54 開口部
55 ボーイング
60 金属
100 制御装置
Claims (8)
- 処理容器内に供給される第1のガスから生成したプラズマにより、シリコン含有酸化膜上のマスクのパターンに該シリコン含有酸化膜をエッチングする第1の工程と、
前記処理容器内に供給される第2のガスから生成したプラズマにより、前記第1の工程において前記シリコン含有酸化膜の開口部及び前記マスクに付着した反応生成物を除去する第2の工程と、を有し、
前記第2の工程は、プラズマ生成用の高周波電力及びバイアス電圧発生用の高周波電力を印加し、前記第2のガスからプラズマを生成する、
エッチング方法。 - 前記第1のガスは、フルオロカーボンガス又はハイドロフルオロカーボンガスを含む、
請求項1に記載のエッチング方法。 - 前記第2のガスは、酸素ガスである、
請求項1又は2に記載のエッチング方法。 - 前記第2の工程において、前記処理容器内の圧力は、100mT(13.32Pa)以下に保持されている、
請求項1〜3のいずれか一項に記載のエッチング方法。 - 前記第2の工程の後に、前記処理容器内に供給される第3のガスから生成したプラズマにより、前記シリコン含有酸化膜の開口部及び該開口部の近傍をエッチングする第3の工程を有する、
請求項1〜4のいずれか一項に記載のエッチング方法。 - 前記第3のガスは、フルオロカーボンガスを含む、
請求項5に記載のエッチング方法。 - 前記第3の工程の後に、前記処理容器内に供給される酸素ガスを含む第4のガスから生成したプラズマにより、前記シリコン含有酸化膜上のマスクをアッシングする第4の工程を有する、
請求項5又は6に記載のエッチング方法。 - 前記第4の工程の後に、前記シリコン含有酸化膜に形成された前記開口部の内部に金属を埋め込む第5の工程を有する、
請求項7に記載のエッチング方法。
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JP2017121596A JP6840041B2 (ja) | 2017-06-21 | 2017-06-21 | エッチング方法 |
KR1020180068496A KR102557053B1 (ko) | 2017-06-21 | 2018-06-15 | 에칭 방법 |
US16/010,794 US10651077B2 (en) | 2017-06-21 | 2018-06-18 | Etching method |
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JP2017121596A JP6840041B2 (ja) | 2017-06-21 | 2017-06-21 | エッチング方法 |
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JP6840041B2 JP6840041B2 (ja) | 2021-03-10 |
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Citations (5)
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JPH10261713A (ja) * | 1997-03-19 | 1998-09-29 | Sony Corp | 半導体装置の製造方法 |
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