JP7357778B2 - 金属の原子層エッチング - Google Patents
金属の原子層エッチング Download PDFInfo
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- JP7357778B2 JP7357778B2 JP2022517970A JP2022517970A JP7357778B2 JP 7357778 B2 JP7357778 B2 JP 7357778B2 JP 2022517970 A JP2022517970 A JP 2022517970A JP 2022517970 A JP2022517970 A JP 2022517970A JP 7357778 B2 JP7357778 B2 JP 7357778B2
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- cobalt
- copper
- hexafluoroacetylacetonate
- oxidized
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- 238000005530 etching Methods 0.000 title claims description 26
- 229910052751 metal Inorganic materials 0.000 title claims description 7
- 239000002184 metal Substances 0.000 title claims description 7
- 150000002739 metals Chemical class 0.000 title description 2
- 239000010410 layer Substances 0.000 claims description 166
- 239000010949 copper Substances 0.000 claims description 93
- 229910017052 cobalt Inorganic materials 0.000 claims description 81
- 239000010941 cobalt Substances 0.000 claims description 81
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 81
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 79
- 229910052802 copper Inorganic materials 0.000 claims description 79
- 238000000034 method Methods 0.000 claims description 51
- 239000000758 substrate Substances 0.000 claims description 50
- 230000001590 oxidative effect Effects 0.000 claims description 30
- 229910052782 aluminium Inorganic materials 0.000 claims description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 27
- 150000001875 compounds Chemical class 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 20
- 229910052760 oxygen Inorganic materials 0.000 claims description 20
- -1 oxygen ions Chemical class 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 17
- 239000003039 volatile agent Substances 0.000 claims description 15
- 239000007800 oxidant agent Substances 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(i) oxide Chemical compound [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 4
- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 3
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 description 13
- 239000007789 gas Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 229960004643 cupric oxide Drugs 0.000 description 3
- BYEAHWXPCBROCE-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-ol Chemical compound FC(F)(F)C(O)C(F)(F)F BYEAHWXPCBROCE-UHFFFAOYSA-N 0.000 description 2
- CSUFEOXMCRPQBB-UHFFFAOYSA-N 1,1,2,2-tetrafluoropropan-1-ol Chemical compound CC(F)(F)C(O)(F)F CSUFEOXMCRPQBB-UHFFFAOYSA-N 0.000 description 2
- QBWSSVADSVSHAN-UHFFFAOYSA-N CC(C(F)(F)F)(C(F)(F)F)O.CC(CC(C)=O)=O Chemical compound CC(C(F)(F)F)(C(F)(F)F)O.CC(CC(C)=O)=O QBWSSVADSVSHAN-UHFFFAOYSA-N 0.000 description 2
- 239000005749 Copper compound Substances 0.000 description 2
- 239000005751 Copper oxide Substances 0.000 description 2
- LBFUKZWYPLNNJC-UHFFFAOYSA-N cobalt(ii,iii) oxide Chemical compound [Co]=O.O=[Co]O[Co]=O LBFUKZWYPLNNJC-UHFFFAOYSA-N 0.000 description 2
- 150000001880 copper compounds Chemical class 0.000 description 2
- 229910000431 copper oxide Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000000992 sputter etching Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- HZXGNBMOOYOYIS-PAMPIZDHSA-L copper;(z)-1,1,1,5,5,5-hexafluoro-4-oxopent-2-en-2-olate Chemical compound [Cu+2].FC(F)(F)C(/[O-])=C/C(=O)C(F)(F)F.FC(F)(F)C(/[O-])=C/C(=O)C(F)(F)F HZXGNBMOOYOYIS-PAMPIZDHSA-L 0.000 description 1
- 229940112669 cuprous oxide Drugs 0.000 description 1
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000003631 wet chemical etching Methods 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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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
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- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
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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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- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
- H01L21/31055—Planarisation of the insulating layers involving a dielectric removal step the removal being a chemical etching step, e.g. dry etching
- H01L21/31056—Planarisation of the insulating layers involving a dielectric removal step the removal being a chemical etching step, e.g. dry etching the removal being a selective chemical etching step, e.g. selective dry etching through a mask
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Description
2Cu(s)+酸化性物質→Cu2Oまたは2CuO (式1)
に基づいて、銅(I)酸化物(すなわち、第1銅酸化物)(CU2O)または銅(II)酸化物(すなわち、第2銅酸化物)(2CuO)を形成する。
Cu2O+2H(hfac)(g)→Cu(s)+Cu(hfac)2(g)+H2O(g) (式2)
CuO+2H(hfac)(g)→Cu(hfac)2(g)+H2O(g) (式3)
において示される。
2Co(s)+酸化性物質→2CoO (式4)
に基づいて、コバルト酸化物(CoO)を形成する。
CoO+2H(hfac)(g)→Co(hfac)2(g)+H2O(g) (式5)
において示される。
Claims (20)
- 半導体製造用途の基板上に設けられた金属層である第1の層をエッチングする方法であって、
処理チャンバ内で第1の層の第1の表面を酸化させることと、
前記第1の層の酸化された前記第1の表面を、100℃から300℃の温度でヘキサフルオロアセチルアセトナート蒸気に曝露して、揮発性化合物を形成することと、
曝露する工程後に、前記処理チャンバ内のシャワーヘッドを用いて前記基板を加熱することと、
前記揮発性化合物を前記処理チャンバから送り出すことと
を含む、方法。 - 前記第1の表面が、酸素イオンおよび低エネルギーの電気的バイアスを使用して方向性をもって酸化される、請求項1に記載の方法。
- 前記第1の層が、銅、コバルト、またはアルミニウムを含み、前記第1の表面を酸化させ、酸化された前記第1の表面層をヘキサフルオロアセチルアセトナートに曝露することが、前記第1の層をエッチングし、前記第1の層の酸化された前記第1の表面のみがエッチングされて、前記第1の層の第2の表面を露出する、請求項1に記載の方法。
- 前記第1の層の前記第2の表面を酸化させることと、
前記第1の層の酸化された前記第2の表面を、100℃から300℃の温度でヘキサフルオロアセチルアセトナート蒸気に曝露して、前記揮発性化合物を形成することと、
前記揮発性化合物を前記処理チャンバから送り出すことと
をさらに含む、請求項3に記載の方法。 - 銅層をエッチングする方法であって、
処理チャンバ内で銅層の表面を酸化させることと、
前記銅層の酸化された前記表面をヘキサフルオロアセチルアセトナート蒸気に曝露して、銅(II)ヘキサフルオロアセチルアセトナート化合物を形成することと、
曝露する工程後に、前記処理チャンバ内のシャワーヘッドを用いて前記基板を加熱することと、
前記銅(II)ヘキサフルオロアセチルアセトナート化合物を前記処理チャンバから送り出すことと
を含む、方法。 - 前記銅層を酸化させるために、水、オゾン、酸素、および酸素プラズマからなる群から選択される酸化剤が使用される、請求項5に記載の方法。
- 前記銅層の前記表面を酸化させることが、銅(I)酸化物または銅(II)酸化物を形成する、請求項6に記載の方法。
- 前記銅層を酸化させ、前記銅層の酸化された前記表面をヘキサフルオロアセチルアセトナートに曝露することが、前記銅層の前記表面をエッチングする、請求項7に記載の方法。
- 前記銅層の酸化された前記表面のみがエッチングされる、請求項8に記載の方法。
- 前記銅層を酸化させ、前記銅層の酸化された前記表面をヘキサフルオロアセチルアセトナートに曝露することが、水を形成し、前記水が気体状であり、前記水が前記処理チャンバから送り出される、請求項8に記載の方法。
- 前記銅(II)ヘキサフルオロアセチルアセトナート化合物に低エネルギーでアルゴンイオンを衝突させることをさらに含む、請求項5に記載の方法。
- 前記銅層の酸化された前記表面をヘキサフルオロアセチルアセトナート蒸気に曝露することが、100℃から300℃の温度で実行される、請求項5に記載の方法。
- コバルト層をエッチングする方法であって、
処理チャンバ内でコバルト層の表面を酸化させることと、
前記コバルト層の酸化された前記表面をヘキサフルオロアセチルアセトナート蒸気に曝露して、コバルト(II)ヘキサフルオロアセチルアセトナート化合物を形成することと、
曝露する工程後に、前記処理チャンバ内のシャワーヘッドを用いて前記基板を加熱することと、
前記コバルト(II)ヘキサフルオロアセチルアセトナート化合物を前記処理チャンバから送り出すことと
を含む、方法。 - 前記コバルト層を酸化させるために、水、オゾン、酸素、および酸素プラズマからなる群から選択される酸化剤が使用される、請求項13に記載の方法。
- 前記コバルト層の前記表面を酸化させることが、コバルト酸化物を形成する、請求項13に記載の方法。
- 前記コバルト層を酸化させ、前記コバルト層の酸化された前記表面をヘキサフルオロアセチルアセトナートに曝露することが、前記コバルト層の前記表面をエッチングする、請求項15に記載の方法。
- 前記コバルト層の酸化された前記表面のみがエッチングされる、請求項16に記載の方法。
- 前記コバルト層を酸化させ、前記コバルト層の酸化された前記表面をヘキサフルオロアセチルアセトナートに曝露することが、水を形成し、前記水が気体状であり、前記水が前記処理チャンバから送り出される、請求項16に記載の方法。
- 前記コバルト(II)ヘキサフルオロアセチルアセトナート化合物に低エネルギーでアルゴンイオンを衝突させることをさらに含む、請求項13に記載の方法。
- 前記コバルト層の酸化された前記表面をヘキサフルオロアセチルアセトナート蒸気に曝露することが、100℃から300℃の温度で実行される、請求項13に記載の方法。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IN201941037780 | 2019-09-19 | ||
IN201941037780 | 2019-09-19 | ||
US17/005,284 US11424134B2 (en) | 2019-09-19 | 2020-08-27 | Atomic layer etching of metals |
US17/005,284 | 2020-08-27 | ||
PCT/US2020/048987 WO2021055166A1 (en) | 2019-09-19 | 2020-09-02 | Atomic layer etching of metals |
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JP2022549244A JP2022549244A (ja) | 2022-11-24 |
JP7357778B2 true JP7357778B2 (ja) | 2023-10-06 |
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JP2022517970A Active JP7357778B2 (ja) | 2019-09-19 | 2020-09-02 | 金属の原子層エッチング |
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US (1) | US11424134B2 (ja) |
EP (1) | EP4032118A4 (ja) |
JP (1) | JP7357778B2 (ja) |
KR (1) | KR102584970B1 (ja) |
CN (1) | CN114375491A (ja) |
WO (1) | WO2021055166A1 (ja) |
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US11866831B2 (en) | 2021-11-09 | 2024-01-09 | Tokyo Electron Limited | Methods for wet atomic layer etching of copper |
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US20210090897A1 (en) | 2021-03-25 |
WO2021055166A1 (en) | 2021-03-25 |
KR20220058633A (ko) | 2022-05-09 |
JP2022549244A (ja) | 2022-11-24 |
EP4032118A4 (en) | 2023-11-01 |
KR102584970B1 (ko) | 2023-10-04 |
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CN114375491A (zh) | 2022-04-19 |
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