JP6812880B2 - 基板処理方法及び記憶媒体。 - Google Patents
基板処理方法及び記憶媒体。 Download PDFInfo
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- JP6812880B2 JP6812880B2 JP2017065965A JP2017065965A JP6812880B2 JP 6812880 B2 JP6812880 B2 JP 6812880B2 JP 2017065965 A JP2017065965 A JP 2017065965A JP 2017065965 A JP2017065965 A JP 2017065965A JP 6812880 B2 JP6812880 B2 JP 6812880B2
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- 239000000758 substrate Substances 0.000 title claims description 61
- 238000003672 processing method Methods 0.000 title claims description 13
- 239000007789 gas Substances 0.000 claims description 162
- 238000005530 etching Methods 0.000 claims description 112
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 87
- 238000012545 processing Methods 0.000 claims description 44
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 39
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 38
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 23
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 17
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 12
- 239000011737 fluorine Substances 0.000 claims description 12
- 229910052731 fluorine Inorganic materials 0.000 claims description 12
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 4
- 229910018503 SF6 Inorganic materials 0.000 claims description 2
- QKCGXXHCELUCKW-UHFFFAOYSA-N n-[4-[4-(dinaphthalen-2-ylamino)phenyl]phenyl]-n-naphthalen-2-ylnaphthalen-2-amine Chemical compound C1=CC=CC2=CC(N(C=3C=CC(=CC=3)C=3C=CC(=CC=3)N(C=3C=C4C=CC=CC4=CC=3)C=3C=C4C=CC=CC4=CC=3)C3=CC4=CC=CC=C4C=C3)=CC=C21 QKCGXXHCELUCKW-UHFFFAOYSA-N 0.000 claims description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 2
- 235000012431 wafers Nutrition 0.000 description 89
- 238000012546 transfer Methods 0.000 description 26
- 229910004298 SiO 2 Inorganic materials 0.000 description 23
- 238000012360 testing method Methods 0.000 description 21
- 238000010438 heat treatment Methods 0.000 description 12
- 238000011156 evaluation Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000003028 elevating effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001020 plasma etching Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 230000002079 cooperative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000002277 temperature effect Effects 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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- H01L21/31105—Etching inorganic layers
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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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- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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- 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
- H01L21/3205—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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- General Chemical & Material Sciences (AREA)
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Description
真空雰囲気である処理容器内にて前記基板にフッ素含有ガスを供給する工程と、
次いで前記基板にフッ素含有ガス及び三フッ化塩素ガスを同時に供給する工程と、を含むことを特徴とする。
前記コンピュータプログラムは、上述の基板処理方法を実施するためにステップ群が組まれていることを特徴とする。
さらに自然酸化膜除去処理後のウエハWの表面における自然酸化膜の残存量に関わらずSiGe層100のエッチング速度が揃う。そのため異なるウエハW間におけるエッチング量の再現性を高めることができる。
本発明の効果を検証するために行った試験について記載する。ClF3ガスによるSiGe層のエッチング量及びSiGe層に対する、Si層、SiO2層及びSiN層のエッチング選択比について調べた。シリコンからなる4枚の評価用の基板を用い、一枚の基板にSiGe層を成膜し、他の基板に夫々Si層、SiO2層及びSiN層を成膜して4種の評価用の基板を作成した。そして図1、図2に示す実施の形態に用いたエッチング装置3を備えた基板処理装置を用い、実施の形態と同様に自然酸化膜の除去を行った後、以下の試験例1〜3に示すプロセス条件にて、4種の評価用の基板に各々ClF3ガス及びArガスの混合ガスを供給してエッチングを行った。そしてエッチング処理後における各評価用の基板のエッチング量から、各試験例におけるSiGe層、Si層、SiO2層及びSiN層のエッチング量及びSiGe層に対する、Si層、SiO2層及びSiN層のエッチング選択比を求めた。
ClF3ガスによるSiGe層のエッチングにおける温度の影響について調べるため4種の評価用の基板に対して、温度のパラメータを夫々0.1、15、30、45及び60℃に設定してエッチングを行った。エッチングのその他のプロセス条件は、処理容器の圧力を30mT(4Pa)、ClF3ガスの流量を10〜30sccm、Arガスの流量を91〜285sccmとし、プロセス時間を20秒間とした。
[試験例2]
ClF3ガスによるSiGe層のエッチングにおける圧力の影響について調べるため処理容器10内の圧力のパラメータを夫々20、30及び40mT(2.67、4及び5.33Pa)に設定してエッチングを行った。エッチングのその他のプロセス条件は、評価用の基板の温度を30℃、ClF3ガスの流量を10〜30sccm、Arガスの流量を91〜285sccmとし、プロセス時間を20秒間とした。
[試験例3]
ClF3ガスによるSiGe層のエッチングにおけるClF3ガスの流量の影響について調べるためClF3ガスの流量のパラメータを10、20及び30sccmに夫々設定してエッチングを行った。エッチングのその他のプロセス条件は、評価用の基板の温度を30℃、処理容器の圧力を30mT(4Pa)、Arガスの流量を91〜285sccmとし、プロセス時間を20秒間とした。
なお図15及び17中に記載した※は、SiO2層のエッチング量がマイナスの値と測定されたため、選択比が負の値を示した試験を示す。マイナスの値のエッチング量は略0と推測されるため、実質選択比は略無限大であると考えられる。
3 エッチング装置
4 載置台
10 処理容器
31 排気口
36 ガス導入部
100 SiGe層
101 Si層
102 SiO2層
103 凹部
104 HFガス
105 ClF3ガス
W ウエハ
Claims (8)
- シリコンゲルマニウム層と、シリコン層、酸化シリコン層及び窒化シリコン層の内の少なくとも一種の層と、が露出した基板におけるシリコンゲルマニウム層をエッチングするエッチング方法において、
真空雰囲気である処理容器内にて前記基板にフッ素含有ガスを供給する工程と、
次いで前記基板にフッ素含有ガス及び三フッ化塩素ガスを同時に供給する工程と、を含むことを特徴とする基板処理方法。 - 前記基板は、シリコン層とシリコンゲルマニウム層とが交互に積層され、各層の端面が露出している積層構造体を備えていることを特徴とする請求項1に記載の基板処理方法。
- 前記フッ素含有ガスは、フッ化水素ガス、三フッ化窒素ガス、フッ素ガス及び六フッ化硫黄の群から選ばれたガスであることを特徴とする請求項1または2に記載の基板処理方法。
- 三フッ化塩素ガスの流量に対する前記フッ素含有ガスの流量比(フッ素含有ガスの流量/三フッ化塩素ガスの流量)が5以上であることを特徴とする請求項1ないし3のいずれか一項に記載の基板処理方法。
- 前記工程における基板の温度が0.1〜100℃であることを特徴とする請求項1ないし4のいずれか一項に記載の基板処理方法。
- 前記工程における処理容器内の圧力が1.3〜66.7Paであることを特徴とする請求項1ないし5のいずれか一項に記載の基板処理方法。
- 前記工程の前に、基板に処理ガスを供給して基板の表面の自然酸化膜を除去する工程を含むことを特徴とする請求項1ないし6のいずれか一項に記載の基板処理方法。
- 真空雰囲気である処理容器内にて前記基板にガスを供給して処理を行う基板処理装置に用いられるコンピュータプログラムを記憶した記憶媒体であって、
前記コンピュータプログラムは、請求項1ないし7のいずれか一項に記載の基板処理方法を実施するためにステップ群が組まれていることを特徴とする記憶媒体。
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JP2017065965A JP6812880B2 (ja) | 2017-03-29 | 2017-03-29 | 基板処理方法及び記憶媒体。 |
TW107108753A TWI740014B (zh) | 2017-03-29 | 2018-03-15 | 基板處理方法及記憶媒體 |
PCT/JP2018/010713 WO2018180670A1 (ja) | 2017-03-29 | 2018-03-19 | 基板処理方法及び記憶媒体 |
US16/498,796 US11342192B2 (en) | 2017-03-29 | 2018-03-19 | Substrate processing method and storage medium |
KR1020197028046A KR102316179B1 (ko) | 2017-03-29 | 2018-03-19 | 기판 처리 방법 및 기억 매체 |
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JP7257543B2 (ja) | 2019-10-29 | 2023-04-13 | 東京エレクトロン株式会社 | 基板処理方法、基板処理装置及びナノワイヤ又はナノシートのトランジスタの製造方法 |
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US11538690B2 (en) | 2021-02-09 | 2022-12-27 | Tokyo Electron Limited | Plasma etching techniques |
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