JP4825526B2 - Fin型チャネルトランジスタおよびその製造方法 - Google Patents
Fin型チャネルトランジスタおよびその製造方法 Download PDFInfo
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- JP4825526B2 JP4825526B2 JP2006027300A JP2006027300A JP4825526B2 JP 4825526 B2 JP4825526 B2 JP 4825526B2 JP 2006027300 A JP2006027300 A JP 2006027300A JP 2006027300 A JP2006027300 A JP 2006027300A JP 4825526 B2 JP4825526 B2 JP 4825526B2
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- 239000004065 semiconductor Substances 0.000 claims description 83
- 239000000758 substrate Substances 0.000 claims description 62
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- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 36
- 229910052751 metal Inorganic materials 0.000 claims description 29
- 239000002184 metal Substances 0.000 claims description 29
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
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- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 5
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 claims description 5
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- 229910052581 Si3N4 Inorganic materials 0.000 description 9
- 230000003071 parasitic effect Effects 0.000 description 9
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 9
- 229910052785 arsenic Inorganic materials 0.000 description 8
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- 235000012239 silicon dioxide Nutrition 0.000 description 5
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- 150000002500 ions Chemical class 0.000 description 4
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
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- 229910052759 nickel Inorganic materials 0.000 description 2
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 229910052738 indium Inorganic materials 0.000 description 1
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- 238000001459 lithography Methods 0.000 description 1
- 229910021334 nickel silicide Inorganic materials 0.000 description 1
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
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- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
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- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66787—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a gate at the side of the channel
- H01L29/66795—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a gate at the side of the channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
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- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7842—Field effect transistors with field effect produced by an insulated gate means for exerting mechanical stress on the crystal lattice of the channel region, e.g. using a flexible substrate
- H01L29/7848—Field effect transistors with field effect produced by an insulated gate means for exerting mechanical stress on the crystal lattice of the channel region, e.g. using a flexible substrate the means being located in the source/drain region, e.g. SiGe source and drain
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- 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
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78618—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
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Description
Y.K. Choi et al. "FinFET Process Refinements for Improved Mobility and Gate Work Function Engineering", Technical Digest of International Electron Devices Meeting (IEDM) (December 2002), pp259
次に、本発明の第1実施形態によるFin型チャネルトランジスタの構成を、図1(a)乃至図7を参照して説明する。本実施形態のFin型チャネルトランジスタは、n型チャネルデバイスの例を示すが、イオン注入するイオン種を変えるなどすればp型チャネルデバイスについても同様に作製できる。
次に、本発明の第2実施形態によるFin型チャネルトランジスタの構成を図8(a)乃至図10に示す。図8(a)は本実施形態によるFin型チャネルトランジスタの平面図、図8(b)は図8(a)に示す切断線A−Aで切断したときの断面図、図8(c)は図8(a)に示す切断線B−Bで切断したときの断面図、図9は図8(a)に示す切断線C−Cで切断したときの断面図、図10は本実施形態によるFin型チャネルトランジスタの斜視図である。
次に、本発明の第3実施形態によるFin型チャネルトランジスタの構成を図11および図12を参照して説明する。
次に、本発明の第4実施形態によるFin型チャネルトランジスタの構成を図13を参照して説明する。
次に、本発明の第5実施形態によるFin型チャネルトランジスタを図14を参照して説明する。
次に、本発明の第6実施形態によるFin型チャネルトランジスタの製造方法を説明する。本実施形態のFin型チャネルトランジスタは、n型チャネルデバイスの例を示すがイオン注入するイオン種を変えるなどすればp型チャネルデバイスについても同様に作製できる。
2 支持基板
4 絶縁膜
6 Fin部
8 チャネル保護膜
9 ゲート絶縁膜
10 ゲート電極
12 ゲート側壁
14 不純物領域
15 チャネル領域
16 ディープ拡散層領域
18 シリサイド層
20 シリサイド層
21 ソース・ドレイン層
22 シリコン層
23 ハロー領域
31 不純物領域
33 コンタクト
41 キャップ層
43 溝
Claims (17)
- 基板上に設けられたほぼ直方体形状の第1導電型の第1半導体層と、
前記第1半導体層の対向する一対の第1側面にゲート絶縁膜を介して設けられたゲート電極と、
前記第1半導体層の、前記第1側面とほぼ直交する方向の対向する一対の第2側面の底部に接続されて前記直交する方向に延在する第1導電型の第2半導体層と、
前記第2半導体層に設けられた第2導電型の第1不純物領域と、
前記第1半導体層の前記一対の第2側面に形成される前記第1不純物領域と接続する第2不純物領域と、
前記第1半導体層の前記第2不純物領域間に設けられたチャネル領域と、
前記第1半導体層の前記第2側面と平行な前記ゲート電極の側部に設けられた絶縁体からなる一対の側壁と、
を備え、
前記第1側面で切断したときの前記一対の側壁の最大幅と前記ゲート電極の幅との和が、前記第1半導体層の前記一対の第2側面間の距離にほぼ等しいことを特徴とするFin型チャネルトランジスタ。 - 前記第1半導体層の上面に絶縁体からなる保護膜が設けられ、前記第1半導体層の一対の第1側面に設けられたゲート電極は前記保護膜上に延在していることを特徴とする請求項1記載のFin型チャネルトランジスタ。
- 前記第1半導体層は複数であって、前記複数の第1半導体層は前記一対の第1側面と直交する方向に前記ゲート電極を介して一列上に配列されていることを特徴とする請求項1または2記載のFin型チャネルトランジスタ。
- 前記基板はSOI基板であり、前記第1不純物領域は前記SOI基板のSOI層に設けられ、前記第2不純物領域は第2導電型であることを特徴とする請求項1乃至3のいずれかに記載のFin型チャネルトランジスタ。
- 前記基板はバルクシリコン基板であり、前記第1不純物領域は前記バルクシリコン基板に設けられていることを特徴とする請求項1乃至3のいずれかに記載のFin型チャネルトランジスタ。
- 前記第1不純物領域の表面にシリコンまたはシリコン・ゲルマニウムエピタキシャル層が形成され、その一部もしくは全部がシリサイド化又はジャーマノシリサイド化されていることを特徴とする請求項1乃至5のいずれかに記載のFin型チャネルトランジスタ。
- ソース・ドレインとして前記第1半導体層とショットキー接合する金属層が設けられていることを特徴とする請求項1乃至5のいずれかに記載のFin型チャネルトランジスタ。
- 前記金属層は、前記第1不純物領域がn型である場合には希土類金属またはこれらの金属を含むシリサイドであり、前記第1不純物領域がp型である場合には貴金属またはこれらの金属を含むシリサイドであることを特徴とする請求項7記載のFin型チャネルトランジスタ。
- 前記第2不純物領域は第1導電型のハロー領域であることを特徴とする請求項8記載のFin型チャネルトランジスタ。
- 前記第2不純物領域は前記第1不純物領域と同程度の濃度を有する第2導電型の不純物領域であることを特徴とする請求項7記載のFin型チャネルトランジスタ。
- 前記ゲート電極は金属または金属シリサイドから形成されていることを特徴とする請求項1記載のFin型チャネルトランジスタ。
- 基板上に形成された半導体層をパターニングすることにより直方体形状のFin部を形成する工程と、
前記Fin部の対向する一対の第1側面にゲート絶縁膜を形成する工程と、
前記Fin部の少なくとも前記一対の第1側面に前記ゲート絶縁膜を挟むようにゲート電極を形成する工程と、
全面に絶縁物を堆積し、前記絶縁物をエッチングするとともに前記Fin部をエッチングすることにより、前記Fin部の前記一対の第1側面とほぼ直交する方向の前記Fin部の対向する一対の第2側面を露出するとともに前記一対の第2側面と平行な前記ゲート電極の側部に前記絶縁物からなる側壁を形成しかつ前記一対の第2側面の底部に接続するように前記ゲート電極の両側に前記半導体層を残置する工程と、
を備え、前記第1側面で切断したときの前記一対の側壁の最大幅と前記ゲート電極の幅との和が、前記Fin部の前記一対の第2側面間の距離にほぼ等しいことを特徴とするFin型チャネルトランジスタの製造方法。 - 前記Fin部を形成する工程は、前記半導体層のパターニングの前に前記半導体層上に第1絶縁層を形成し、前記第1絶縁層および前記半導体層をパターニングする工程を含むことを特徴とする請求項12記載のFin型チャネルトランジスタの製造方法。
- 露出した前記第2側面および残置された前記半導体層に不純物領域を形成する工程と、
前記不純物領域および前記ゲート電極をシリサイド化する工程と、
を備えたことを特徴とする請求項12または13記載のFin型チャネルトランジスタの製造方法。 - 基板上に形成された半導体層上に第1絶縁層を形成する工程と、
前記第1絶縁層および前記半導体層をパターニングすることにより直方体形状のFin部を形成する工程と、
前記半導体層の対向する一対の第1側面にゲート絶縁膜を形成する工程と、
全面にゲート電極材料膜を形成した後、前記ゲート電極材料膜上に第2絶縁層を形成する工程と、
前記第2絶縁層および前記ゲート電極材料膜をパターニングすることにより、前記半導体層の前記第1側面に形成された前記ゲート絶縁膜および前記半導体層の上面の前記第1絶縁層を覆うゲート電極を形成するとともに前記ゲート電極の上面に前記第2絶縁層を残置する工程と、
全面に絶縁物を堆積し、前記絶縁物をエッチングするとともに前記Fin部をエッチングすることにより、前記半導体層の前記一対の第1側面とほぼ直交する方向の前記半導体層の対向する一対の第2側面を露出するとともに前記一対の第2側面の底部に接続するように前記ゲート電極の両側に前記半導体層を残置しかつ前記パターニングされた前記第2絶縁層および前記ゲート電極の側部に前記絶縁物からなるゲート側壁を形成する工程と、
露出した前記第2側面に第1不純物領域を形成するとともに残置された前記半導体層に第2不純物領域を形成する工程と、
前記ゲート側壁に挟まれた前記第2絶縁層を除去し、前記ゲート電極の上面を露出する工程と、
前記第1および第2不純物領域および前記ゲート電極をシリサイド化する工程と、
を備え、前記第1側面で切断したときの前記一対の側壁の最大幅と前記ゲート電極の幅との和が、前記半導体層の前記一対の第2側面間の距離にほぼ等しいことを特徴とするFin型チャネルトランジスタの製造方法。 - 前記基板はSOI基板であり、前記半導体層は前記SOI基板のSOI層であることを特徴とする請求項12乃至15のいずれかに記載のFin型チャネルトランジスタの製造方法。
- 前記基板はバルク基板であることを特徴とする請求項12乃至15のいずれかに記載のFin型チャネルトランジスタの製造方法。
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