JPWO2014030389A1 - ゲルマニウム層上に酸化ゲルマニウムを含む膜を備える半導体構造およびその製造方法 - Google Patents
ゲルマニウム層上に酸化ゲルマニウムを含む膜を備える半導体構造およびその製造方法 Download PDFInfo
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- 229910052732 germanium Inorganic materials 0.000 title claims abstract description 139
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 title claims abstract description 135
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 title claims abstract description 125
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 239000004065 semiconductor Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 83
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 79
- 239000001301 oxygen Substances 0.000 claims description 79
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 6
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 5
- 229910000449 hafnium oxide Inorganic materials 0.000 claims description 5
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- HYXGAEYDKFCVMU-UHFFFAOYSA-N scandium oxide Chemical compound O=[Sc]O[Sc]=O HYXGAEYDKFCVMU-UHFFFAOYSA-N 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims 1
- 239000010408 film Substances 0.000 description 237
- 239000000758 substrate Substances 0.000 description 59
- 230000003647 oxidation Effects 0.000 description 25
- 238000007254 oxidation reaction Methods 0.000 description 25
- 238000010586 diagram Methods 0.000 description 22
- 238000005259 measurement Methods 0.000 description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 229910052710 silicon Inorganic materials 0.000 description 11
- 239000010703 silicon Substances 0.000 description 11
- 238000005530 etching Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000010931 gold Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- 229910005793 GeO 2 Inorganic materials 0.000 description 4
- 229910001882 dioxygen Inorganic materials 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002484 cyclic voltammetry Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052773 Promethium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- SRQSFQDGRIDVJT-UHFFFAOYSA-N germanium strontium Chemical compound [Ge].[Sr] SRQSFQDGRIDVJT-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass 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
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- KJXBRHIPHIVJCS-UHFFFAOYSA-N oxo(oxoalumanyloxy)lanthanum Chemical compound O=[Al]O[La]=O KJXBRHIPHIVJCS-UHFFFAOYSA-N 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- VQMWBBYLQSCNPO-UHFFFAOYSA-N promethium atom Chemical compound [Pm] VQMWBBYLQSCNPO-UHFFFAOYSA-N 0.000 description 1
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical group [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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- 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
- H01L21/04—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
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28255—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor belonging to Group IV and not being elemental silicon, e.g. Ge, SiGe, SiGeC
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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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- H01L21/02175—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal
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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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- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/0223—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate
- H01L21/02233—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer
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Abstract
Description
酸素圧力:70気圧、基板温度:500℃
酸素圧力:70気圧、基板温度:550℃
酸素圧力:1気圧、基板温度:500℃
サンプルをエチルアルコール(C2H5OH):水(H2O)が100:5の混合液に浸漬し、酸化ゲルマニウムの膜厚のエッチング速度を測定した。図3(a)および図3(b)は、エッチング時間に対する酸化ゲルマニウムの膜厚を示す図である。ドットが測定点、直線が測定点の近似線を示す。図3(a)および図3(b)の傾きの絶対値がエッチング速度に対応する。図3(a)に示すように、基板温度が500℃であり、酸素圧力が1気圧のサンプルにおいては、エッチング速度は約0.56nm/分である。基板温度が500℃であり、酸素圧力が70気圧のサンプルにおいては、エッチング速度はエッチング時間が5分までは約0.37nm/分である。5分以降は約0.19nm/分である。図3(b)に示すように、基板温度が550℃であり、酸素圧力が70気圧のサンプルにおいては、エッチング速度は約0.62nm/分である。
酸素圧力:70気圧、基板温度:500℃
酸素圧力:70気圧、基板温度:550℃
酸素圧力:1気圧、基板温度:500℃
log10μeff>−0.59×log10Ns+10.19
この範囲の移動度μeffは、ゲルマニウム層を用いたMOSFETではこれまで実現できていなかった。実施例2に係る半導体構造を用いはじめて実現することができた。
log10μeff>−0.59×log10Ns+10.3
が好ましく、
log10μeff>−0.59×log10Ns+10.5
がより好ましい。
12、32 酸化ゲルマニウム膜
14、16、36 金属膜
30 ゲルマニウム層
34 高誘電体酸化膜
38 ゲート電極
40 ソースまたはドレイン領域
Claims (16)
- ゲルマニウム層と、
前記ゲルマニウム層上に形成された酸化ゲルマニウムを含む膜と、前記酸化ゲルマニウムを含む膜上に形成され、酸化シリコンより比誘電率の大きな高誘電体酸化膜と、を含む絶縁膜と、
を具備し、
前記絶縁膜のEOTが2nm以下であり、かつ前記絶縁膜上に金属膜としてAuを形成した際の前記金属膜のゲルマニウム層に対する電圧をフラットバンド電圧から蓄積領域側に1V印加したときのリーク電流密度が10−5×EOT+4A/cm2以下であることを特徴とする半導体構造。 - 前記高誘電体酸化膜は、酸化ハフニウム膜、酸化ジルコニウム膜、酸化アルミニウム膜、酸化イットリウム膜、酸化スカンジウム膜および希土類元素酸化膜の少なくとも1つの膜を含むことを特徴とする請求項1記載の半導体構造。
- 前記絶縁膜上に金属膜としてAuを形成した際の前記ゲルマニウム層と前記金属膜との周波数が50kHz以上における容量値は、前記金属膜の前記ゲルマニウム層に対する電圧がフラットバンド電圧から反転領域に変化するときに一様に減少する、または一定であることを特徴とする請求項1または2記載の半導体構造。
- 前記高誘電体酸化膜上にゲート電極を具備することを特徴とする請求項1から3のいずれか一項記載の半導体構造。
- 前記ゲルマニウム層はp型であり、前記ゲルマニウム層内の面電子密度をNs(cm−2)前記ゲルマニウム層の電子移動度をμeff(cm2/V・s)としたとき、
Nsが5×1012cm−2以上において、log10μeff>−0.59×log10Ns+10.19であることを特徴とする請求項4記載の半導体構造。 - ゲルマニウム層と、
前記ゲルマニウム層上に形成され、密度が3.6g/cm3以上、かつEOTが2nm以下の酸化ゲルマニウム膜と、
を具備することを特徴とする半導体構造。 - 前記酸化ゲルマニウム膜上に金属膜としてAuを形成した際の前記ゲルマニウム層と前記金属層との周波数が50kHz以上における容量値は、前記金属膜の前記ゲルマニウム層に対する電圧がフラットバンド電圧から反転領域に変化するときに一様に減少する、または一定であることを特徴とする請求項6記載の半導体構造。
- 前記酸化ゲルマニウム膜上にゲート電極を具備することを特徴とする請求項6または7記載の半導体構造。
- ゲルマニウム層上に、酸化シリコンより比誘電率の大きな高誘電体酸化膜を形成する工程と、
酸素雰囲気、室温での前記酸素の分圧が1気圧より大きくなるような分圧、かつ前記ゲルマニウム層の温度が450℃以上かつ550℃より低い条件において、前記高誘電体酸化膜を介して前記ゲルニウム層を酸化させることにより、前記ゲルマニウム層と前記高誘電率酸化膜との間に酸化ゲルマニウムを含む膜を形成する工程と、
を含むことを特徴とする半導体構造の製造方法。 - 前記条件は、室温での前記酸素の分圧が10気圧以上となるような分圧、かつゲルマニウム層の温度が520℃以下の条件であることを特徴とする請求項9記載の半導体構造の製造方法。
- 前記高誘電体酸化膜は、酸化ハフニウム膜、酸化ジルコニウム膜、酸化アルミニウム膜、酸化イットリウム膜、酸化スカンジウム膜および希土類元素酸化膜の少なくとも1つの膜を含むことを特徴とする請求項9または10記載の半導体構造の製造方法。
- 前記高誘電体酸化膜にゲート電極を形成する工程を含むことを特徴とする請求項9から11のいずれか一項記載の半導体構造の製造方法。
- 前記高誘電率酸化膜上にゲート電極を形成する工程を含み、
前記条件は、室温での前記酸素の分圧が10気圧以上となるような分圧、かつゲルマニウム層の温度が520℃以下の条件であり、
前記高誘電体酸化膜は酸化イットリウムであることを特徴とする請求項9記載の半導体構造の製造方法。 - 酸素雰囲気、室温での前記酸素の分圧が1気圧より大きくなるような分圧、かつゲルマニウム層の温度が450℃以上かつ550℃より低い条件において、前記ゲルマニウム層の上面を酸化することにより、前記ゲルマニウム層上に酸化ゲルマニウム膜を形成する工程を含むことを特徴とする半導体構造の製造方法。
- 前記条件は、室温での前記酸素の分圧が10気圧以上となるような分圧、かつゲルマニウム層の温度が520℃以下の条件であることを特徴とする請求項14記載の半導体構造の製造方法。
- 前記酸化ゲルマニウム膜上にゲート電極を形成する工程を含むことを特徴とする請求項14または15記載の半導体構造の製造方法。
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