JP4185057B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 37
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 239000000758 substrate Substances 0.000 claims description 51
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 40
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 36
- 229910052710 silicon Inorganic materials 0.000 claims description 36
- 239000010703 silicon Substances 0.000 claims description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 33
- 239000007789 gas Substances 0.000 claims description 25
- UYJXRRSPUVSSMN-UHFFFAOYSA-P ammonium sulfide Chemical compound [NH4+].[NH4+].[S-2] UYJXRRSPUVSSMN-UHFFFAOYSA-P 0.000 claims description 22
- 238000002161 passivation Methods 0.000 claims description 17
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
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- 229910052727 yttrium Inorganic materials 0.000 description 3
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- XUKUURHRXDUEBC-SXOMAYOGSA-N (3s,5r)-7-[2-(4-fluorophenyl)-3-phenyl-4-(phenylcarbamoyl)-5-propan-2-ylpyrrol-1-yl]-3,5-dihydroxyheptanoic acid Chemical compound C=1C=CC=CC=1C1=C(C=2C=CC(F)=CC=2)N(CC[C@@H](O)C[C@H](O)CC(O)=O)C(C(C)C)=C1C(=O)NC1=CC=CC=C1 XUKUURHRXDUEBC-SXOMAYOGSA-N 0.000 description 2
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- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
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- CGRVKSPUKAFTBN-UHFFFAOYSA-N N-silylbutan-1-amine Chemical compound CCCCN[SiH3] CGRVKSPUKAFTBN-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
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- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(iv) oxide Chemical compound O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
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- 229910000077 silane Inorganic materials 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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- 239000011593 sulfur Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/51—Insulating materials associated therewith
- H01L29/517—Insulating materials associated therewith the insulating material comprising a metallic compound, e.g. metal oxide, metal silicate
-
- 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
- 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
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28158—Making the insulator
- H01L21/28167—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation
- H01L21/28185—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation with a treatment, e.g. annealing, after the formation of the gate insulator and before the formation of the definitive gate conductor
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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
- H01L21/04—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
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28158—Making the insulator
- H01L21/28167—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation
- H01L21/28194—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation by deposition, e.g. evaporation, ALD, CVD, sputtering, laser deposition
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- 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
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- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823857—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the gate insulating layers, e.g. different gate insulating layer thicknesses, particular gate insulator materials or particular gate insulator implants
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/51—Insulating materials associated therewith
- H01L29/511—Insulating materials associated therewith with a compositional variation, e.g. multilayer structures
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Description
本発明の他の目的は、酸化シリコンより誘電率の高い高誘電率絶縁材料をゲート絶縁膜として形成することのできる半導体装置の製造方法を提供することである。
本発明の他の目的は、ゲート絶縁膜としてフラットバンド電圧のシフトを低減した高誘電率酸化物膜を形成することのできる半導体装置の製造方法を提供することである。
(a)シリコン基板の活性領域表面にSiO又はSiONからなる界面層を形成する工程と、
(b)前記界面層上方に酸化シリコンより高い誘電率を有するHfSiONからなるゲート絶縁膜を形成する工程と、
(c)前記ゲート絶縁膜上方にポリシリコンからなるゲート電極を形成する工程と、
(d)前記高誘電率のゲート絶縁膜を形成する工程の前後の少なくとも一方で、硫化アンモニウム、硫化アンモニウム水溶液、硫化水素ガスの少なくとも1つを用いて、基板表面をS処理することで基板表面をパッシヴェーション処理する工程と、
(e)少なくとも前記ゲート電極、前記高誘電率のゲート絶縁膜をパターニングして絶縁ゲート電極構造を形成する工程と、
(f)前記絶縁ゲート電極構造両側の前記活性領域にソース/ドレイン領域を形成する工程と、
を含む半導体装置の製造方法
が提供される。
図1Aに示すように、主表面が(100)面であるp型シリコン基板1表面の自然酸化膜を希フッ酸で除去した後、SC2洗浄液で洗浄し、シリコン表面に厚さ1nm程度の酸化シリコン(ケミカルオキサイド)膜を形成した。
図1Cに示すように、70℃に保った硫化アンモニウム(NH4)2Sx水溶液に1分間浸し、S処理を行った。S処理により、基板表面が真っ白になり、S膜3が形成されたと考えられる。なお、比較サンプルにおいては、50℃に保った硫化アンモニウム(NH4)2Sx水溶液に1分間浸し、S処理を行った。この時は、基板表面の変化は観察されなかった。硫化アンモニウム水溶液は、アンモニウムを28wt%含む純粋のアンモニウム水中にSを6.0wt%〜7.5wt%含むものである。
図1Eに示すように、200℃〜300℃の熱窒素で基板表面を乾燥した。当初は、基板表面にかなりの量のSが付着し、真っ白であるが、熱窒素乾燥を行っていくと、基板表面がシリコンの色を回復し、余分なSが昇華すると考えられる。S膜3はほとんど膜厚を持たない状態になるが、図示の便宜上膜厚を有する状態で示す。サンプルとして、この段階ではS処理を行わないものも準備した。
S処理により、Sのパッシヴェーションが形成されたか否かをオージェー電子分光(Auger electronspectroscopy)で測定した。
図3Aに示すように、(100)主面を有するp型シリコン基板11にシャロートレンチアイソレーション(STI)による素子分離領域12を形成し、活性領域表面上にスルー酸化膜13を形成する。レジストマスクRMをもちいてnチャネルMOSトランジスタ(n−MOS)領域にp型不純物、pチャネルMOSトランジスタ(p−MOS)領域にn型不純物をイオン注入し、p型ウェルWp,n型ウェルWnを形成する。例えば、p型不純物Bを加速電圧360kV、ドーズ量1×1013cm−2(以下1E13の用に略記する)、n型不純物Asを加速電圧360kV、ドーズ量1E13でイオン注入する。
以下、本発明の特徴を付記する。
シリコン基板と、
前記シリコン基板の表面に画定された活性領域と、
前記活性領域の中間に形成された絶縁ゲート電極であって、活性領域上の界面層と、界面層上方に形成され、酸化シリコンより高い誘電率を有する高誘電率のゲート絶縁膜と、ゲート絶縁膜上方に形成されたゲート電極とを含み、前記絶縁ゲート電極と前記界面層との界面および前記ゲート絶縁膜と前記ゲート電極との界面の少なくとも一方がパッシヴェーションされている絶縁ゲート電極と、
前記絶縁ゲート電極両側の前記活性領域に形成されたソース/ドレイン領域と、
を有する半導体装置。
前記界面層が、SiO,SiONの少なくとも1つを含む付記1記載の半導体装置。
(付記3) (3)
前記高誘電率のゲート絶縁膜が、Hf,Al,Zr,Ta,Ti,Yの少なくとも1つを含む付記1または2記載の半導体装置。
前記パッシヴェーションが、S,Se,Teの少なくとも1つを前記界面近傍の全面に含むことで行なわれている付記1〜3のいずれか1項記載の半導体装置。
前記ゲート電極がSiを含み、前記ゲート絶縁膜と前記ゲート電極との界面がパッシヴェーションされている付記1〜4のいずれか1項記載の半導体装置。
前記絶縁ゲート電極と前記界面層との界面がSでパッシヴェーションされ、前記高誘電率のゲート絶縁膜がHfSiONで形成されている請求項1〜5のいずれか1項記載の半導体装置。
さらに、前記ゲート絶縁膜と前記ゲート電極との界面がパッシヴェーションされ、ゲート電極が多結晶シリコン層を含む請求項6記載の半導体装置。
(a)シリコン基板の活性領域表面に界面層を形成する工程と、
(b)前記界面層上方に酸化シリコンより高い誘電率を有する高誘電率のゲート絶縁膜を形成する工程と、
(c)前記ゲート絶縁膜上方にゲート電極を形成する工程と、
(d)前記高誘電率のゲート絶縁膜を形成する工程の前後の少なくとも一方で、基板表面をパッシヴェーション処理する工程と、
(e)少なくとも前記ゲート電極、前記高誘電率のゲート絶縁膜をパターニングして絶縁ゲート電極構造を形成する工程と、
(f)前記絶縁ゲート電極構造両側の前記活性領域にソース/ドレイン領域を形成する工程と、
を含む半導体装置の製造方法。
前記工程(a)がシリコン基板表面にSiO層またはSiON層を形成する付記8記載の半導体装置の製造方法。
前記工程(b)が、Hf、Al,Zr,Ta,Ti,Yの少なくとも1つを含む酸化膜を形成する付記8または9記載の半導体装置の製造方法。
前記工程(d)が、S,Se,Teの少なくとも1つを前記界面近傍の全面に含ませることで行なわれる付記8〜10のいずれか1項記載の半導体装置の製造方法。
前記工程(d)が、硫化アンモニウム、硫化アンモニウム水溶液、硫化水素ガスの少なくとも1つを用いて、基板表面をS処理する付記8〜11のいずれか1項記載の半導体装置の製造方法。
前記工程(d)が、S濃度が5wt%以上の硫化アンモニウム水溶液を用いて、基板表面をS処理する付記7記載の半導体装置の製造方法。
前記工程(d)が、温度60度以上の硫化アンモニウム水溶液を用いて行なわれる付記13記載の半導体装置の製造方法。
さらに、(g)前記工程(d)の後、基板表面を熱窒素乾燥する工程を含む付記12〜14のいずれか1項記載の半導体装置の製造方法。
2 SiO膜
3,5、P パッシヴェーション
4 ゲート絶縁膜
6 ポリシリコン電極
12 STI
13 スルー酸化膜
14 界面層
16 高誘電率絶縁膜
18 ゲート電極
21 エクステンション
25 ソース/ドレイン領域
SW サイドウォールスペーサ
27s シリサイド層
Claims (4)
- (a)シリコン基板の活性領域表面にSiO又はSiONからなる界面層を形成する工程と、
(b)前記界面層上方に酸化シリコンより高い誘電率を有するHfSiONからなるゲート絶縁膜を形成する工程と、
(c)前記ゲート絶縁膜上方にポリシリコンからなるゲート電極を形成する工程と、
(d)前記高誘電率のゲート絶縁膜を形成する工程の前後の少なくとも一方で、硫化アンモニウム、硫化アンモニウム水溶液、硫化水素ガスの少なくとも1つを用いて、基板表面をS処理することで基板表面をパッシヴェーション処理する工程と、
(e)少なくとも前記ゲート電極、前記高誘電率のゲート絶縁膜をパターニングして絶縁ゲート電極構造を形成する工程と、
(f)前記絶縁ゲート電極構造両側の前記活性領域にソース/ドレイン領域を形成する工程と、
を含む半導体装置の製造方法。 - 前記工程(d)が、S濃度が5wt%以上の硫化アンモニウム水溶液を用いて、基板表面をS処理する請求項1記載の半導体装置の製造方法。
- 前記工程(d)が、温度60度以上の硫化アンモニウム水溶液を用いて行なわれる請求項2記載の半導体装置の製造方法。
- さらに、(g)前記工程(d)の後、基板表面を熱窒素乾燥する工程を含む請求項1〜3のいずれか1項記載の半導体装置の製造方法。
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US7425761B2 (en) * | 2005-10-28 | 2008-09-16 | Samsung Electronics Co., Ltd. | Method of manufacturing a dielectric film in a capacitor |
US7867843B2 (en) * | 2006-12-22 | 2011-01-11 | Intel Corporation | Gate structures for flash memory and methods of making same |
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US9711373B2 (en) * | 2008-09-22 | 2017-07-18 | Taiwan Semiconductor Manufacturing Company, Ltd. | Method of fabricating a gate dielectric for high-k metal gate devices |
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