JP2021048401A - 高抵抗シリコンオンインシュレータ構造及びその製造方法 - Google Patents
高抵抗シリコンオンインシュレータ構造及びその製造方法 Download PDFInfo
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- JP2021048401A JP2021048401A JP2020194948A JP2020194948A JP2021048401A JP 2021048401 A JP2021048401 A JP 2021048401A JP 2020194948 A JP2020194948 A JP 2020194948A JP 2020194948 A JP2020194948 A JP 2020194948A JP 2021048401 A JP2021048401 A JP 2021048401A
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- single crystal
- layer
- crystal semiconductor
- silicon
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Classifications
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—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
- H01L21/02112—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
- H01L21/02123—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
- H01L21/0217—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 nitride not containing oxygen, e.g. SixNy or SixByNz
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76251—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques
- H01L21/76256—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology using bonding techniques using silicon etch back techniques, e.g. BESOI, ELTRAN
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
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- H01L21/02112—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
- H01L21/02123—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
- H01L21/02126—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 containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
- H01L21/0214—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 containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being a silicon oxynitride, e.g. SiON or SiON:H
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—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
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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Abstract
Description
本出願は、2016年12月5日に出願された、米国仮特許出願62/429922の優先権を主張し、その開示は、その全ての記載を本明細書に援用する。
本発明は、一般的に半導体ウエハ製造の分野に関する。本発明は、セミコンダクタオンインシュレータ(例えばシリコンオンインシュレータ)構造の製造の使用のためのハンドル基板を準備する方法、特にセミコンダクタオンインシュレータ構造のハンドルウエハに電荷捕獲層を作り出す方法に関する。
本発明で用いられる基板は、例えば、単結晶半導体ハドルウェハなどの半導体ハンドル基板及び例えば単結晶半導体ドナーウエハなどの半導体ドナー基板を含む。セミコンダクタオンインシュレータ複合構造の半導体装置層は、単結晶半導体ドナーウエハから得る。半導体装置層は、例えば半導体ドナー基板をエッチングなどのウエハ薄化技術または損傷面を備える半導体ドナー基板を劈開することによって、半導体ハンドル基板上に転置されることができる。
本発明の方法によると、図3A及び3Bを参照しながら、電荷捕獲層200は、単結晶半導体ハンドルウエハ100の前面102に接触して堆積される。いくつかの実施形態において、電荷捕獲層200は多結晶シリコンを含む。そのような材料は、多結晶半導体材料とアモルファス半導体材料を含む。多結晶またはアモルファスである材料は、シリコン(Si)、シリコンゲルマニウム(SiGe)、炭素がドープされたシリコン(SiC)、及びゲルマニウム(Ge)を含む。例えば多結晶シリコンなどの多結晶半導体は、ランダムな結晶配向を有する小さいシリコン結晶を備える材料を意味する。多結晶材料は、ランダムな結晶配向を有する小さい結晶を備える材料を意味する。多結晶粒は、約20nmの小さい大きさであり、粒の大きさは、一般に約20nmから約1μm、例えば約0.3μmから約1μmに及ぶ。本発明の方法によると、多結晶材料の結晶粒の大きさが小さいほど、電荷捕獲層の欠陥性が高く堆積した。多結晶シリコン電荷捕獲層の抵抗率は、少なくとも100Ωcm、少なくとも約500Ωcm、少なくとも約1000Ωcm、少なくとも約3000Ωcm、またはさらに少なくとも約7000Ωcmであり、例えば、約100Ωcmから約100000Ωcmまたは約500Ωcmから約100000Ωcm、または約1000Ωcmから約100000Ωcm、または約500Ωcmから約100000Ωcm、または約750Ωcmから約100000Ωcmである。いくつかの好ましい実施形態において、多結晶シリコン層の抵抗率は、約3000Ωcmから約100000Ωcm、例えば約3000Ωcmから約10000Ωcmまたはさらに約7000Ωcmから約100000Ωcm、例えば約7000Ωcmから約10000Ωcmである。
いくつかの実施形態において、図3B及び3Cを参照しながら、半導体窒化物層(例えば窒化ケイ素)または半導体酸窒化物層(例えば酸窒化ケイ素)を備える絶縁層300は、堆積された電荷捕獲層200に接触して形成される。これは、例えば熱窒化またはCVD窒化物堆積などの方法によって達成された。いくつかの実施形態において、電荷捕獲層は、熱的に窒化される(堆積された半導体材料膜の一部が消費される)または膜はCVD窒化物堆積によって堆積される。いくつかの実施形態において、電荷捕獲層は、例えばASM A400などの加熱炉で熱的に窒化されることができる。温度は、窒化雰囲気で、750℃から1400℃、例えば1100℃から1400℃に及ぶことができる。窒化雰囲気大気は、例えばAr、N2等の不活性ガス及び任意にO2の混合物であることができる。窒素含有量は、1から10%またはさらに高く変えることができる。典型的な実施形態において、半導体ハンドルウエハは、例えばA400などの縦型炉に積み込まれる。温度は、Ar及びN2及び任意にO2の混合物を備えて窒化温度へ上昇される。所望の窒化ケイ素または酸窒化ケイ素の厚さが得られた後、ガスフローは、切られ、加熱炉温度は、減少し、ウエハは、加熱炉から取り出される。代わりの窒素源は、アンモニアである。いくつかの実施形態において、電荷捕獲層は、約1.5nmから約50nm、例えば約2.5nmから約10nm、または約2.5nmから約5nm、例えば約3.5nmの厚さの窒化物層または酸窒化物層を提供するのに十分な期間処理されることができる。
いくつかの実施形態において、多結晶シリコン電荷捕獲層200と絶縁層300を備える単結晶半導体ハンドル基板100は、酸素プラズマ及び/または窒素プラズマ表面活性化を受ける。いくつかの実施形態において、酸素プラズマ及び/または窒素プラズマ表面活性化装置は、例えばEVG(登録商標)810LT Low Temp Plasma Activation SystemなどのEV グループから入手可能な、市販の装置である。多結晶シリコン電荷捕獲層200と絶縁層300を備える単結晶半導体ハンドル基板100は、チャンバに積み込まれる。チャンバは、真空にされ、大気よりも低い圧力へ、例えばアルゴンなど、キャリアガスに、酸素ガス源及び/または窒素ガス源で、埋め戻され、それによってプラズマを作り出す。酸素及び/または水は、プラズマ酸化物処理のための適切なソースガスである。アンモニア及び/または窒素及び/または一酸化窒素(NO)及び/または亜酸化窒素(N2O)ガスは、プラズマ窒化物処理のための適切なソースガスである。酸窒化物プラズマ活性化は、大気雰囲気に酸素と窒素ガス源を含む。単結晶半導体ハンドル基板100は、約1秒から約120秒に及ぶ所望の時間このプラズマにさらされる。酸素または窒素プラズマ表面酸化は、単結晶半導体ハンドル基板100の前面を親水性にし、単結晶半導体ドナー基板への接合を受け入れさせるために実行される。プラズマ活性化の後、活性化された表面は、脱イオン水でリンスされる。ウエハは、その後接合前にスピン乾燥される。
図3Dを参照すると、多結晶シリコン電荷捕獲層200及び絶縁層300を備える、本明細書に記載された方法によって準備された、例えば単結晶シリコンハンドルウエハ、単結晶半導体ハンドルウエハなど、高抵抗単結晶半導体ハンドル基板100は、次に従来の層転置方法によって準備される、例えば単結晶半導体ドナーウエハなどの半導体ドナー基板400に接合される。単結晶半導体ドナー基板400は、単結晶半導体ウエハである。好ましい実施形態において、半導体ウエハは、シリコン、炭化シリコン、シリコンゲルマニウム、ヒ化ガリウム、窒化ガリウム、リン化インジウム、ヒ化インジウムガリウム、ゲルマニウム、及びそれらの組み合わせからなるグループから選択される材料を含む。完成した集積回路装置の所望の特性により、単結晶半導体(例えばシリコン)ドナーウエハ400は、ボロン(p型)、ガリウム(p型)、アルミニウム(p型)、インジウム(p型)、リン(n型)、アンチモン(n型)、及びヒ素(n型)の中から選択されたドーパントを含む。単結晶半導体(例えばシリコン)ドナーウエハの抵抗率は、1から50Ωcm、典型的には5から25Ωcmに及ぶ。単結晶半導体ドナーウエハ400は、酸化、注入、注入後洗浄を含む標準プロセスステップを受ける。したがって、エッチングされ、研磨され、任意に酸化された、例えば単結晶シリコンドナーウエハといった多層半導体構造の準備に従来用いられる材料の単結晶半導体ウエハなど、半導体ドナー基板400は、ドナー基板に損傷層を形成するためにイオン注入を受ける。
実施例1
Claims (40)
- おおよそ平行な2つの主要な表面であって、前記表面の一方は、単結晶半導体ハンドル基板の前面であり、前記表面の他方は、前記単結晶半導体ハンドル基板の裏面である表面と、前面と裏面との間の仮想中央平面と、前記単結晶半導体ハンドル基板の前及び裏面を接合する周縁エッジと、前記単結晶半導体ハンドル基板の前及び裏面の間のバルク領域と、を備える単結晶半導体ハンドル基板であって、前記単結晶半導体ハンドル基板は、少なくとも約500Ωcmの最小バルク領域抵抗率を有する、単結晶半導体ハンドル基板と、
多結晶シリコン層を備える電荷捕獲層であって、前記電荷捕獲層は、前記単結晶半導体ハンドル基板の前面と界面接触し、前記電荷捕獲層は、少なくとも約1000Ωcmの最小抵抗率を有する電荷捕獲層と、
前記多結晶シリコン層と界面接触する窒化ケイ素または酸窒化ケイ素を含む絶縁層と、
単結晶シリコン装置層と、を備える多層構造。 - 前記単結晶半導体ハンドル基板は、単結晶シリコンを含む、請求項1に記載の多層構造。
- 前記単結晶半導体ハンドル基板は、チョクラルスキ法またはフロートゾーン法によって成長された単結晶シリコンインゴットからスライスされた単結晶シリコンウエハを備える、請求項1に記載の多層構造。
- 前記単結晶半導体ハンドル基板は、約500Ωcmから約100000Ωcmのバルク抵抗率を有する、請求項1乃至3のいずれか1項に記載の多層構造。
- 前記単結晶半導体ハンドル基板は、約1000Ωcmから約100000Ωcmのバルク抵抗率を有する、請求項1乃至3のいずれか1項に記載の多層構造。
- 前記単結晶半導体ハンドル基板は、約1000Ωcmから約6000Ωcmのバルク抵抗率を有する、請求項1乃至3のいずれか1項に記載の多層構造。
- 前記単結晶半導体ハンドル基板は、約3000Ωcmから約5000Ωcmのバルク抵抗率を有する、請求項1乃至3のいずれか1項に記載の多層構造。
- 前記電荷捕獲層は、少なくとも約3000Ωcmの最小抵抗率を有する、請求項1乃至7のいずれか1項に記載の多層構造。
- 前記電荷捕獲層は、少なくとも約7000Ωcmの最小抵抗率を有する、請求項1乃至7のいずれか1項に記載の多層構造。
- 前記絶縁層は、窒化ケイ素を含む、請求項1乃至9のいずれか1項に記載の多層構造。
- 前記絶縁層は、酸窒化ケイ素層を備える、請求項1乃至10のいずれか1項に記載の多層構造。
- 前記絶縁層は、約2000Åから約10000Åの厚さを有する、請求項1乃至11のいずれか1項に記載の多層構造。
- さらに、前記絶縁層と界面接触する誘電体層を備え、
さらに前記単結晶シリコン装置層は、前記誘電体層と界面接触する、請求項1乃至12のいずれか1項に記載の多層構造。 - 前記誘電体層は、二酸化ケイ素、窒化ケイ素、酸窒化ケイ素、酸化ハフニウム、酸化チタン、酸化ジルコニウム、酸化ランタン、酸化バリウム及びそれらの組み合わせからなるグループから選択された材料を含む、請求項13に記載の多層構造。
- 前記誘電体層は、二酸化ケイ素、窒化ケイ素、酸窒化ケイ素、及びそれらの組み合わせからなるグループから選択された材料を含む、請求項13に記載の多層構造。
- 前記誘電体層は、複数の層を備え、
前記複数の層内のそれぞれの絶縁層は、二酸化ケイ素、酸窒化ケイ素、及び窒化ケイ素からなるグループから選択された材料を含む、請求項13に記載の多層構造。 - 前記誘電体層は、少なくとも10nm、例えば、約10nmから約10000nm、約10nmから約5000nm、約50nmから約400nm、または約100nmから約400nm、例えば約50nm、100nm、または200nmの厚さを有する絶縁層を備える、請求項13に記載の多層構造。
- 多層構造を準備する方法であって、
方法は、
単結晶半導体ハンドル基板の前面に電荷捕獲層を堆積するステップであって、前記単結晶半導体ハンドル基板は、おおよそ平行な2つの主要な表面であって、前記表面の一方は、前記単結晶半導体ハンドルの前面であり、前記表面の他方は、前記単結晶半導体ハンドルの裏面である表面と、前面と裏面との間の仮想中央平面と、前記単結晶半導体ハンドル基板の前及び裏面を接合する周縁エッジと、前記単結晶半導体ハンドル基板の前及び裏面の間のバルク領域と、を備え、前記単結晶半導体ハンドル基板は、少なくとも約500Ωcmの最小バルク領域抵抗率を有し、さらに前記電荷捕獲層は、多結晶シリコンを含み、少なくとも約1000Ωcmの最小抵抗率を有する、電荷捕獲層を堆積するステップと、
前記多結晶シリコン層上に、窒化ケイ素または酸窒化ケイ素を含む絶縁層を堆積するステップと、
前記絶縁層に単結晶半導体ドナー基板の前面上の誘電体層を接合し、それにより接合構造を形成するステップであって、前記単結晶半導体ドナー基板は、おおよそ平行な2つの主要な表面であって、前記表面の一方は、前記半導体ドナー基板の前面であり、前記表面の他方は、前記半導体ドナー基板の裏面である表面と、前記半導体ドナー基板の前及び裏面を接合する周縁エッジと、前記半導体ドナー基板の前及び裏面の間の中央平面と、前記半導体ドナー基板の前及び裏面の間のバルク領域と、を備え、さらに前記単結晶半導体ドナー基板は劈開面を備える、接合構造を形成するステップと、を備える方法。 - 前記単結晶半導体ハンドル基板は、単結晶シリコンを含む、請求項18に記載の方法。
- 前記単結晶半導体ハンドル基板は、チョクラルスキ法またはフロートゾーン法によって成長された単結晶シリコンインゴットからスライスされた単結晶シリコンウエハを備える、請求項18に記載の方法。
- 前記単結晶半導体ドナー基板は、単結晶シリコンを含む、請求項18乃至20のいずれか1項に記載の方法。
- 前記単結晶半導体ドナー基板は、チョクラルスキ法またはフロートゾーン法によって成長された単結晶シリコンインゴットからスライスされた単結晶シリコンウエハを備える、請求項18乃至20のいずれか1項に記載の方法。
- 前記単結晶半導体ハンドル基板は、約500Ωcmから約100000Ωcmのバルク抵抗率を有する、請求項18乃至22のいずれか1項に記載の方法。
- 前記単結晶半導体ハンドル基板は、約1000Ωcmから約100000Ωcmのバルク抵抗率を有する、請求項18乃至22のいずれか1項に記載の方法。
- 前記単結晶半導体ハンドル基板は、約1000Ωcmから約6000Ωcmのバルク抵抗率を有する、請求項18乃至22のいずれか1項に記載の方法。
- 前記単結晶半導体ハンドル基板は、約3000Ωcmから約5000Ωcmのバルク抵抗率を有する、請求項18乃至22のいずれか1項に記載の方法。
- 前記電荷捕獲層は、少なくとも約3000Ωcmの最小抵抗率を有する、請求項18乃至25のいずれか1項に記載の方法。
- 前記電荷捕獲層は、少なくとも約7000Ωcmの最小抵抗率を有する、請求項18乃至25のいずれか1項に記載の方法。
- 前記絶縁層は、窒化ケイ素を含む、請求項18乃至28のいずれか1項に記載の方法。
- 前記窒化ケイ素は、プラズマ化学気相成長法によって堆積される、請求項29に記載の方法。
- 前記絶縁層は、酸窒化ケイ素を含む、請求項18乃至28のいずれか1項に記載の方法。
- 前記酸窒化ケイ素は、プラズマ化学気相成長法によって堆積される、請求項31に記載の方法。
- 前記絶縁層は、約2000Åから約10000Åの厚さを有する、請求項18乃至32のいずれか1項に記載の方法。
- 前記誘電体層は、二酸化ケイ素、窒化ケイ素、酸窒化ケイ素、酸化ハフニウム、酸化チタン、酸化ジルコニウム、酸化ランタン、酸化バリウム及びそれらの組み合わせからなるグループから選択された材料を含む、請求項18乃至33のいずれか1項に記載の方法。
- 前記誘電体層は、二酸化ケイ素、窒化ケイ素、酸窒化ケイ素、及びそれらの組み合わせからなるグループから選択された材料を含む、請求項18乃至33のいずれか1項に記載の方法。
- 前記誘電体層は、複数の層を備え、
前記複数の層内のそれぞれの絶縁層は、二酸化ケイ素、酸窒化ケイ素、及び窒化ケイ素からなるグループから選択された材料を含む、請求項18乃至33のいずれか1項に記載の方法。 - 前記誘電体層は、少なくとも10nm、例えば、約10nmから約10000nm、約10nmから約5000nm、約50nmから約400nm、または約100nmから約400nm、例えば約50nm、100nm、または200nmの厚さを有する絶縁層を備える、請求項18乃至36のいずれか1項に記載の方法。
- さらに前記単結晶半導体ドナー基板の前面上の前記誘電体層に接合する前に、前記絶縁層をプラズマ活性するステップを備える、請求項18乃至37のいずれか1項に記載の方法。
- さらに前記単結晶半導体ドナー基板の前面上の前記誘電体層と前記絶縁層の間の接合を強化するのに十分な温度と期間で、接合構造をアニールするステップを備える、請求項18乃至38のいずれか1項に記載の方法。
- さらに前記劈開面に沿って接合構造を劈開し、それにより前記単結晶半導体ハンドル基板、前記電荷捕獲層、前記絶縁層、及び単結晶半導体装置層を備える、劈開構造を準備するステップを備える、請求項18乃至39のいずれか1項に記載の方法。
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