JP2017011127A - エッチング方法 - Google Patents
エッチング方法 Download PDFInfo
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- JP2017011127A JP2017011127A JP2015125773A JP2015125773A JP2017011127A JP 2017011127 A JP2017011127 A JP 2017011127A JP 2015125773 A JP2015125773 A JP 2015125773A JP 2015125773 A JP2015125773 A JP 2015125773A JP 2017011127 A JP2017011127 A JP 2017011127A
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- gas
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- 238000000034 method Methods 0.000 title claims abstract description 117
- 238000005530 etching Methods 0.000 title claims abstract description 80
- 239000007789 gas Substances 0.000 claims abstract description 157
- 238000012545 processing Methods 0.000 claims abstract description 134
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011261 inert gas Substances 0.000 claims abstract description 19
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- 239000010703 silicon Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 27
- 239000001301 oxygen Substances 0.000 claims description 27
- 229910052760 oxygen Inorganic materials 0.000 claims description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 86
- 235000012431 wafers Nutrition 0.000 description 54
- 230000000052 comparative effect Effects 0.000 description 22
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 8
- 229910052731 fluorine Inorganic materials 0.000 description 8
- 239000011737 fluorine Substances 0.000 description 8
- 239000003507 refrigerant Substances 0.000 description 8
- 230000008021 deposition Effects 0.000 description 7
- 230000003628 erosive effect Effects 0.000 description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 239000010432 diamond Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910052756 noble gas Inorganic materials 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910020177 SiOF Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】一実施形態の方法は、金属を含有するマスク及びシリコンを含有する被エッチング層上にフルオロカーボンを含む堆積物を形成するために、該マスク及び該被エッチング層を有する被処理体を収容したプラズマ処理装置の処理容器内において、フルオロカーボンガスを含む第1の処理ガスのプラズマを生成する工程と、堆積物に含まれるフルオロカーボンのラジカルにより被エッチング層をエッチングするために、処理容器内において不活性ガスを含む第2の処理ガスのプラズマを生成する工程と、を含む。この方法では、第1の処理ガスのプラズマを生成する工程と第2の処理ガスのプラズマを生成する工程とを含む複数回のシーケンスが実行される。
【選択図】図1
Description
・処理容器内圧力:10mTorr(1.33Pa)〜150mTorr(20.00Pa)
・処理ガス
C4F8ガス:5sccm〜50sccm
Arガス:500sccm〜1500sccm
・プラズマ生成用の高周波の電力:100W〜500W
・高周波バイアスの電力:0W〜300W
・電源70の負極性の直流電圧:−1000V〜0V
・処理容器内圧力:10mTorr(1.33Pa)〜150mTorr(20.00Pa)
・処理ガス
Arガス:500sccm〜1500sccm
N2ガス:0sccm〜400sccm
O2ガス:0sccm〜50sccm
・プラズマ生成用の高周波の電力:100W〜500W
・高周波バイアスの電力:0W〜300W
・電源70の負極性の直流電圧:−1000V〜0V
・・処理容器内圧力:10mTorr(1.33Pa)〜150mTorr(20.00Pa)
・処理ガス
Arガス:500sccm〜1500sccm
N2ガス:0sccm〜400sccm
O2ガス:5sccm〜50sccm
・プラズマ生成用の高周波の電力:100W〜500W
・高周波バイアスの電力:0W〜300W
・電源70の負極性の直流電圧:−1000V〜0V
<工程ST1>
・処理容器12内の空間の圧力:85mT(11.33Pa)
・処理ガス
C4F8ガス:30sccm
Arガス:1000sccm
・第1の高周波電源62の高周波:40MHz、300W
・第2の高周波電源64の高周波バイアス:13MHz、100W
・電源70の負極性の直流電圧:−300V
・処理時間:4秒
<工程ST2>
・処理容器12内の空間の圧力:85mT(11.33Pa)
・処理ガス
Arガス:1000sccm
N2ガス:20sccm
O2ガス:12sccm
・第1の高周波電源62の高周波:40MHz、300W
・第2の高周波電源64の高周波バイアス:13MHz、100W
・電源70の負極性の直流電圧:−300V
・処理時間:2秒
<比較実験例1〜7の条件>
・処理容器12内の空間の圧力:85mT(11.33Pa)
・処理ガス
C4F8ガス:30sccm
Arガス:1000sccm
N2ガス:20sccm
O2ガス:12sccm
・第1の高周波電源62の高周波:40MHz、300W
・第2の高周波電源64の高周波バイアス:13MHz、100W
・電源70の負極性の直流電圧:−300V
・処理時間:180秒
Claims (8)
- 被エッチング層をエッチングする方法であって、該被エッチング層はシリコンを含有し、該被エッチング層上には金属を含有するマスクが設けられており、該方法は、
フルオロカーボンを含む堆積物を前記マスク及び前記被エッチング層上に形成するために、該マスク及び該被エッチング層を有する被処理体を収容したプラズマ処理装置の処理容器内において、フルオロカーボンガスを含む第1の処理ガスのプラズマを生成する工程と、
前記堆積物に含まれるフルオロカーボンのラジカルにより前記被エッチング層をエッチングするために、前記処理容器内において不活性ガスを含む第2の処理ガスのプラズマを生成する工程と、
を含み、
第1の処理ガスのプラズマを生成する前記工程と第2の処理ガスのプラズマを生成する前記工程とを含む複数回のシーケンスが実行される、方法。 - 前記第2の処理ガスは、前記不活性ガスとして希ガス又は窒素ガスを含む、請求項1に記載の方法。
- 前記第2の処理ガスは、前記不活性ガスとして希ガスを含み、且つ、窒素ガスを含む請求項1に記載の方法。
- 前記第2の処理ガスは、酸素含有ガスを更に含む、請求項2又は3に記載の方法。
- 前記複数回のシーケンスの少なくとも一部は、処理容器内において酸素含有ガス及び不活性ガスを含む処理ガスのプラズマを生成する工程を更に含む、請求項2又は3に記載の方法。
- 前記マスクは窒化チタン製である、請求項1〜5の何れか一項に記載の方法。
- 前記複数回のシーケンスが実行される期間にわたって、前記マスク及び前記被エッチング層を有する被処理体のエッジを囲むようにフォーカスリングが配置され、
前記フォーカスリングは、前記被エッチング層を構成する材料とは異なる材料から構成される、
請求項1〜6の何れか一項に記載の方法。 - 前記プラズマ処理装置は、容量結合型のプラズマ処理装置であり、前記処理容器内の空間を画成する面を含むシリコン製の領域を有する上部電極、及び前記上部電極に負極性の直流電圧を印加するための直流電源を備え、
少なくとも、第1の処理ガスのプラズマを生成する前記工程において、前記上部電極に前記負極性の直流電圧が印加される、
請求項1〜7の何れか一項に記載の方法。
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US20160379834A1 (en) | 2016-12-29 |
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KR102482619B1 (ko) | 2022-12-28 |
KR20170000340A (ko) | 2017-01-02 |
US20210134604A1 (en) | 2021-05-06 |
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