JP2008066562A - 半導体装置およびその製造方法 - Google Patents
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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
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42384—Gate electrodes for field effect devices for field-effect transistors with insulated gate for thin film field effect transistors, e.g. characterised by the thickness or the shape of the insulator or the dimensions, the shape or the lay-out of the conductor
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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
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- 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
- H01L29/41791—Source or drain electrodes for field effect devices for transistors with a horizontal current flow in a vertical sidewall, e.g. FinFET, MuGFET
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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
- H01L29/66—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
- H01L29/66787—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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- 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
- H01L29/66—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
- H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
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- Condensed Matter Physics & Semiconductors (AREA)
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- Thin Film Transistor (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
Abstract
【解決手段】半導体装置25は、半導体基板10上に一定間隔で列状に形成された多数のMOSFET用の複数の柱状ゲート電極16と、複数の柱状ゲート電極16のうちの隣接する2つの柱状ゲート電極間の一部分に形成されるMOSFETのチャネルに相当する半導体領域19と、を備える。この半導体装置の製造方法は、半導体基板を含む基層10〜12の表面に複数の穴14を列状に形成し、これら列状の複数の穴14に半導体を埋め込んで柱状ゲート電極16を列状に複数形成し、ゲート電極16の少なくとも一部を露出させて半導体基板10,11の表面に複数の柱状ゲート電極16を露出させ、隣接する2つの前記柱ゲート電極の離隔する距離の半分の長さよりも厚い絶縁物からなるゲート側壁膜17を成膜し、列状で複数の柱状ゲート電極16の上端を平坦面としてから金属膜により橋絡して第2ゲート電極23を形成し、ゲート電極を製造する。
【選択図】図1
Description
本願発明者は熟考の末に、従来技術のようなFIN形状を有するSOI領域に対してゲート合わせしてパターニングするのではなく、寄生抵抗の問題のないソース・ドレイン領域をセルフアライン(自己整合的)に形成することができる半導体装置とその製造方法の技術を見出すことができた。図1(a)〜(d)は、第1実施形態に係る半導体装置の構造を示すものであり、図1(a)は平面図であり、図1(a)におけるb−b線断面は図1(b)に、c−c線断面は図1(c)に、d−d線断面は図1(d)にそれぞれ示されている。
第2実施形態は、シリコン基板を用いて半導体装置を製造する方法を示している。第1工程ST1において、図10(a)(b)に示すように、まず、半導体基板10に素子分離領域30を形成する。
第3実施形態は、第1ないし第3工程ST1〜ST3までは第2実施形態と同じであるので、図10(a)〜(f)に関連する重複説明を省略して、図16ないし図19を用いて第4工程ST4から説明する。
以下、第4実施形態において、既知のダマシンゲートプロセスを用いた半導体装置の製造方法を説明する。まず、第1工程ST1において、図20(a)(b)に示すように、第1実施形態と同様にして、半導体基板10、BOX酸化膜11、厚み100nm程度のSOI(Silicon on Insulator)領域12からなるSOI基板を用いて、図示のような直径20nm程度で、穴と穴の間隔が25nm程度の複数の穴14を例えばSOI領域12を貫通するように形成する。第1実施形態で用いたカバー膜13はなくても良い。
本発明の実施形態の特徴は、平面で捉えたときのゲート電極16の断面形状が、円、楕円、四角形を含む柱状であることと、隣接する柱状のゲート電極16間をゲート側壁膜17で埋め込むことによって自己整合的にダブルゲート構造のチャネル領域を形成することとの2点である。第1ないし第4実施形態においては、ピラードゲート電極の形状を全て円柱状であるものとして説明したが、本発明の実施形態はこれに限定されず、ピラードゲート電極の形状は柱状でありさえすればいかなる形状であっても良い。このピラードゲートの形状の種々の変形例を第5実施形態として説明する、第5実施形態においては、図28(a)〜(f)に示すように、第2のゲート電極23が省略された状態での層間膜22と柱状ゲート電極16の平面形状をゲート側壁膜17と共に例示している。
11 BOX酸化膜
12 SOI領域
16 柱状ゲート電極
17 ゲート側壁
18 ソース・ドレイン領域
19 チャネル領域
23 第2ゲート電極
25 半導体装置
Claims (5)
- 半導体基板上に離隔して列状に形成された多数のMOSFET用の複数の柱状ゲート電極と、前記複数の柱状ゲート電極のうちの隣接する2つの柱状ゲート電極間の一部分に形成されて前記MOSFETのチャネルに相当する半導体領域と、を備えることを特徴とする半導体装置。
- 前記複数の柱状ゲート電極の間隙側壁の一部に形成されると共に、その厚さが隣接する2つの前記柱状ゲート電極の間隙幅の半分の長さよりも厚いゲート側壁膜をさらに備えることを特徴とする請求項1に記載の半導体装置。
- 前記半導体基板は、バルク基板およびSOI基板の何れか一方を含むことを特徴とする請求項1に記載の半導体装置。
- 半導体基板を含む基層の表面に複数の穴を列状に形成し、
列状に形成された前記複数の穴に第1の導電体を埋め込んで柱状ゲート電極を列状に複数形成し、
前記ゲート電極の少なくとも側面の一部を露出させて前記半導体基板の表面に複数の前記柱状ゲート電極を露出させ、
隣接する2つの前記柱ゲート電極の離隔する距離の半分の長さよりも厚い絶縁物からなるゲート側壁膜を成膜し、
複数の前記柱状ゲート電極の上端を平坦面とした後に列状に形成された前記柱状ゲート電極の上端面を橋絡するように第2の導電体により第2ゲート電極を形成し、
ゲート電極を製造することを特徴とする半導体装置の製造方法。 - 前記基層は、所定の厚さを有する半導体よりなるバルク基板および前記半導体基板の表面に絶縁膜を介して形成された半導体層を有するSOI基板の何れか一方を含むことを特徴とする請求項4に記載の半導体装置の製造方法。
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JP2006243844A JP2008066562A (ja) | 2006-09-08 | 2006-09-08 | 半導体装置およびその製造方法 |
US11/898,020 US7642162B2 (en) | 2006-09-08 | 2007-09-07 | Semiconductor device and method of manufacturing the same |
US12/591,643 US7902603B2 (en) | 2006-09-08 | 2009-11-25 | Semiconductor device and method of manufacturing the same |
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US7902603B2 (en) | 2011-03-08 |
US20100072550A1 (en) | 2010-03-25 |
US20080061370A1 (en) | 2008-03-13 |
US7642162B2 (en) | 2010-01-05 |
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