JP4104541B2 - ショットキー障壁トランジスタ及びその製造方法 - Google Patents
ショットキー障壁トランジスタ及びその製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 46
- 230000004888 barrier function Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 55
- 229910052751 metal Inorganic materials 0.000 claims abstract description 47
- 239000002184 metal Substances 0.000 claims abstract description 47
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims abstract description 35
- 125000006850 spacer group Chemical group 0.000 claims abstract description 32
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 27
- 239000010703 silicon Substances 0.000 claims abstract description 27
- 229910021332 silicide Inorganic materials 0.000 claims abstract description 25
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 238000005530 etching Methods 0.000 claims abstract description 18
- 238000001039 wet etching Methods 0.000 claims abstract description 15
- 230000003247 decreasing effect Effects 0.000 claims abstract 2
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000011065 in-situ storage Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000004518 low pressure chemical vapour deposition Methods 0.000 claims description 8
- 238000000151 deposition Methods 0.000 claims description 5
- 238000000038 ultrahigh vacuum chemical vapour deposition Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 238000007740 vapor deposition Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000001451 molecular beam epitaxy Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- -1 SiCl 2 H 2 ) Chemical compound 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 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
- 238000000059 patterning Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000005293 physical law Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000010407 vacuum cleaning Methods 0.000 description 1
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- H—ELECTRICITY
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- 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
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/80—Field effect transistors with field effect produced by a PN or other rectifying junction gate, i.e. potential-jump barrier
- H01L29/812—Field effect transistors with field effect produced by a PN or other rectifying junction gate, i.e. potential-jump barrier with a Schottky gate
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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
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28026—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor
- H01L21/28114—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor characterised by the sectional shape, e.g. T, inverted-T
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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
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28026—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor
- H01L21/28123—Lithography-related aspects, e.g. sub-lithography lengths; Isolation-related aspects, e.g. to solve problems arising at the crossing with the side of the device isolation; Planarisation aspects
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/665—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using self aligned silicidation, i.e. salicide
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- 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
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66643—Lateral single gate silicon transistors with source or drain regions formed by a Schottky barrier or a conductor-insulator-semiconductor structure
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78651—Silicon transistors
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66636—Lateral single gate silicon transistors with source or drain recessed by etching or first recessed by etching and then refilled
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- Electrodes Of Semiconductors (AREA)
- Thin Film Transistor (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
Description
図1は、本発明の実施例によるSBトランジスタの断面図である。図1を参照すれば、全体的な構造は、SOI(silicon on insulator)ウェーハ1上に形成されている。SOIウェーハ1は基底シリコン層5上に埋込絶縁酸化膜10と非常に薄い単結晶シリコン層20とが積層されている構造である。このようなSOIウェーハ1上にゲート絶縁膜30を介在してゲート60aが形成されている。ゲート60aは高濃度にドーピングされた多結晶シリコンまたはタングステン、アルミニウムなどの金属で構成できる。ゲート60a両側の上部エッジと離隔されて絶縁体膜よりなるスペーサ80aが形成されている。
5 基底シリコン層
10 埋込絶縁酸化膜
20 単結晶シリコン層
30 ゲート絶縁膜
40 導電層
50 マスク
60,60a ゲート
70 絶縁体膜
70a,80a スペーサ
100 多結晶シリコン層
110 単結晶シリコン層
120 ショットキー障壁金属
120a シリサイド層
122 領域
130 ソース/ドレイン
Claims (20)
- 基板上にゲート絶縁膜を介在して形成されたゲートと、
前記ゲート両側の側壁に、ゲート上部エッジを露出するように形成されたスペーサと、
前記ゲート両側の基板に形成されたエレベーテッドシリサイドソース/ドレインと、
前記スペーサを露出しつつ、前記ゲート上部エッジと前記ゲート上部とを覆い包む多結晶シリコン層と、
前記多結晶シリコン層上に形成された金属シリサイド層と
を備えたことを特徴とするショットキー障壁トランジスタ。 - 前記ゲートは、高濃度にドーピングされた多結晶シリコンまたは金属で構成されたことを特徴とする請求項1に記載のショットキー障壁トランジスタ。
- 前記基板は、SOIウェーハであることを特徴とする請求項1に記載のショットキー障壁トランジスタ。
- 基板上にゲート絶縁膜を介在してゲートを形成する段階と、
前記ゲート両側の側壁に、ゲート上部エッジを露出するスペーサを形成する段階と、
選択的シリコン成長を適用して、前記ゲート上部エッジ及び前記ゲート上部に多結晶シリコン層を成長させると同時に前記基板上には単結晶シリコン層を成長させる段階と、
前記多結晶シリコン層及び単結晶シリコン層上に金属を蒸着すると同時に、前記多結晶シリコン層により、前記スペーサ上には前記金属が蒸着されていない領域を形成する段階と、
前記多結晶シリコン層及び単結晶シリコン層と前記金属を反応させて自己整列的に金属シリサイドを形成する段階と
を有することを特徴とするショットキー障壁トランジスタの製造方法。 - 前記多結晶シリコン層により、前記スペーサ上には前記金属が蒸着されていない領域を形成することを特徴とする請求項4に記載のショットキー障壁トランジスタの製造方法。
- 前記ゲートは、高濃度にドーピングされた多結晶シリコンまたは金属で形成することを特徴とする請求項4に記載のショットキー障壁トランジスタの製造方法。
- 前記スペーサを形成する段階は、前記ゲート上に絶縁体膜を蒸着する段階と、前記絶縁体膜を異方性エッチングする段階とを有することを特徴とする請求項4に記載のショットキー障壁トランジスタの製造方法。
- 前記スペーサを形成する段階は、前記ゲートを熱酸化させてその周辺に酸化膜を形成する段階と、前記酸化膜を異方性エッチングする段階とを有することを特徴とする請求項4に記載のショットキー障壁トランジスタの製造方法。
- 前記異方性エッチングする間に前記基板を200〜500Åほどエッチングさせることを特徴とする請求項7又は8に記載のショットキー障壁トランジスタの製造方法。
- ウェットエッチングを微量実施して前記ゲート上部エッジを露出させる段階を有することを特徴とする請求項9に記載のショットキー障壁トランジスタの製造方法。
- 選択的シリコン成長初期インサイチュクリーニング法により前記ゲート上部エッジを露出させる段階を有することを特徴とする請求項9に記載のショットキー障壁トランジスタの製造方法。
- 前記インサイチュクリーニング法は、LPCVD装備で実施し、700〜900℃でH2が0.5〜50slm程度流れる範囲で圧力を0.1〜10Torrに維持した状態で60〜300秒間進めることを特徴とする請求項11に記載のショットキー障壁トランジスタの製造方法。
- 前記ゲート上に多結晶シリコン層を形成すると同時に前記基板上には単結晶シリコン層を成長させる段階は、前記LPCVD装備で進め、DCS、HCl及びH2を工程ガスとして使用し、DCSの流量は0.1〜2slm、HClの流量は0〜3slm、H2の流量は10〜150slmとし、温度は780〜930℃に維持し、圧力は20〜250Torrの条件を利用することを特徴とする請求項12に記載のショットキー障壁トランジスタの製造方法。
- 前記温度が低くなるほど圧力を下げる条件を利用することを特徴とする請求項13に記載のショットキー障壁トランジスタの製造方法。
- 前記インサイチュクリーニング法は、UHV−CVD装備で実施し、10Torr以下の超高真空状態で650〜800℃範囲で60〜300秒間進めることを特徴とする請求項11に記載のショットキー障壁トランジスタの製造方法。
- 前記ゲート上に多結晶シリコン層を形成すると同時に前記基板上には単結晶シリコン層を成長させる段階は、前記UHV−CVD装備で進め、Si2H6 又はSiH4、Cl2及びH2を工程ガスとして使用し、Si2H6 又はSiH4の流量は1〜10sccm、Cl2の流量は0〜5sccm、H2の流量は0〜20sccmとし、温度は500〜750℃に維持し、圧力は0.1〜50mTorrの条件を利用することを特徴とする請求項15に記載のショットキー障壁トランジスタの製造方法。
- 前記ゲート上部に多結晶シリコン層を形成する厚さは、200〜500Å程度にすることを特徴とする請求項4に記載のショットキー障壁トランジスタの製造方法。
- 前記金属を蒸着する厚さは、50〜500Å程度にすることを特徴とする請求項4に記載のショットキー障壁トランジスタの製造方法。
- 前記金属シリサイドを形成する段階は、熱処理ファーネスで300〜600℃で0.5〜2時間の熱処理を適用して進めることを特徴とする請求項4に記載のショットキー障壁トランジスタの製造方法。
- 前記金属シリサイドを形成する段階は、RTP装備で800〜1200℃で1〜30秒間熱処理して進めることを特徴とする請求項4に記載のショットキー障壁トランジスタの製造方法。
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KR100883350B1 (ko) * | 2006-12-04 | 2009-02-11 | 한국전자통신연구원 | 쇼트키 장벽 박막 트랜지스터 제조방법 |
CN101866953B (zh) * | 2010-05-26 | 2012-08-22 | 清华大学 | 低肖特基势垒半导体结构及其形成方法 |
CN102593174B (zh) * | 2011-01-18 | 2015-08-05 | 中国科学院微电子研究所 | 半导体器件及其制造方法 |
CN102593173B (zh) * | 2011-01-18 | 2015-08-05 | 中国科学院微电子研究所 | 半导体器件及其制造方法 |
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