JP5220257B2 - Cmos垂直置換ゲート(vrg)トランジスタ - Google Patents
Cmos垂直置換ゲート(vrg)トランジスタ Download PDFInfo
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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
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- 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
- H01L21/70—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
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- 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
- H01L21/82—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
- 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
- H01L21/823885—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of vertical transistor structures, i.e. with channel vertical to the substrate surface
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—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
- 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
- H01L27/08—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 including only semiconductor components of a single kind
- H01L27/085—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 including only semiconductor components of a single kind including field-effect components only
- H01L27/088—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 including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate
- H01L27/092—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 including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate complementary MIS field-effect transistors
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- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
- Element Separation (AREA)
- Recrystallisation Techniques (AREA)
Description
本発明は電流を流すよう設計された伝導形の変化した接合を組込んだ半導体デバイス及びそのようなデバイスの作製方法に関する。より具体的には、本発明は相補金属一酸化物電界効果トランジスタ(CMOS)垂直置換ゲート(VRG)電界効果トランジスタを含む集積回路及びそのようなデバイスを含んだ集積回路の作製方法に関する。
半導体デバイスの特性を向上させ、デバイス密度(単位面積当りのデバイスの数)を上げることは、半導体産業の重要な目標であり続ける。デバイス密度は個々のデバイスをより小さくし、よりコンパクトにデバイスを充填することによって、増大する。しかし、デバイス寸法(形状寸法あるいは設計則とも呼ばれる)が減少するにつれ、デバイス及びそれらの要素の形成方法は、適合させなければならない。たとえば、生産デバイス寸法は現在0.25ミクロンないし0.18ミクロンの範囲で、より寸法を小さくする冷酷な傾向がある。しかし、デバイスの寸法が縮小されるにつれ、ある種の製造限界が生じる。特に付随したリソグラフィプロセスに限界が生じる。事実、現在のリソグラフィプロセスは今日のデバイスユーザに要求される最小寸法で正確にデバイス作製をすることが不可能になる点に近づきつつある。
CMOS半導体デバイスの使用を更に進展させるために、望ましい空間の節約及びVGRデバイスに付随した作製上の進歩とともに、どこにもあるCMOSデバイスの両方の利点を提供する垂直置換ゲート(VRG)CMOSデバイスを生成する形態を供する。
ここで述べる実施例には、CMOS構造と付随した作製技術が含まれる。CMOS垂直MOSFETを作製するプロセスについては、1999年1月18日に出願され、ここに参照文献として含まれる“垂直トランジスタを有するCMOS集積回路及びその作製プロセス”と題する権利者を同じくする特許出願、米国第290,533号に述べられている。(NMOS又はPMOS形の)垂直MOSFETの構造及び作製に関するより一般的な記述は、権利者を同じくし、ここに参照文献として含まれる米国特許第6,027,975号及び6,197,641号に述べられている。
9 基板
10,12 LOCOS領域
14 ゲート
16 ソース領域
18 ドレイン領域
20 n形井戸
28 ゲート
30 ソース領域
32 ドレイン領域
34 p形井戸
38 ゲート
40 ソース領域
42 ドレイン領域
44 n形井戸
46 二酸化シリコン層
50 p+領域
52 p層
100 層、単結晶半導体層、基板
106 主表面
108 エピタキシャル層
110 二酸化シリコン層、層
112 層、シリコン窒化物層
114 n領域
116 タンク酸化物層
118 面
120 p領域
122 段差
130 トレンチ
132 表面
134 二酸化シリコン層
140 二酸化シリコン層
142 テトラエチレン−オルト−シリケート層、PTEOS層、層
144 シリコン窒化物、層
146 BTEOS層
150 エッチストップ層、層
152 犠牲層、層
154 エッチストップ層
160 PTEOS絶縁層、PTEOS層、層
162 シリコン窒化物層
164 BTEOS層、層
200,202 窓
204,206 結晶半導体材料、結晶半導体
207 シリコン窒化物層
208,210 ポリシリコン層、ドレイン領域
212,220 エッチストップ層
226,227 ゲート誘電体
230 層
232 ゲート電極、層
240,242 ゲート
250,252 ソース/ドレイン延長部
260,262 チャネル
300 TEOS層
302 シリコン窒化物
306 PTEOS層
308 シリコン窒化物層
310 PTEOS層
Claims (15)
- 平面に沿って形成された主表面を有する半導体層;
表面中に形成された第1及び第2の空間的に分離されたドープ領域;
前記第1及び第2の領域を電気的に絶縁するために、前記第1及び前記第2の領域間に配置された分離領域、前記分離領域は第1及び第2のドープ領域間に配置された電気的に絶縁性材料のトレンチと、第1及び第2のドープ領域上の電気的に絶縁性材料の層を含み;
第1及び第2のトレンチを中に含む前記第1及び前記第2のドープ領域上の複数のドープされた絶縁層;
前記第1のドープ領域とは異なる伝導形の前記第1のドープ領域上の前記第1のトレンチ中に形成された第3のドープ領域;
前記第2のドープ領域とは異なる伝導形の前記第2のドープ領域上の前記第2のトレンチ中に形成された第4のドープ領域;
前記第3のドープ領域に近接した第1の酸化物層;及び前記第4のドープ領域に近接した第2の酸化物層を含む集積回路構造であって、
前記第1のドープ領域は第1のMOSFETの第1のソース/ドレイン領域で、前記第3のドープ領域は第1のMOSFETのチャネル領域で、前記第2のドープ領域は第2のMOSFETの第1のソース/ドレイン領域で、前記第4のドープ領域は第2のMOSFETのチャネル領域であり、
前記第1のトレンチ中の前記第3のドープ領域上の部分及び前記第2のトレンチ中の前記第4のドープ領域上の部分を露出させるため、複数の層の1つを除去し、前記第1の酸化物層は前記第3のドープ領域の前記露出された部分に近接し、前記第2の酸化物層は前記第4のドープ領域の前記露出された部分に近接し、
前記第1のドープ領域上にあり、前記第1のドープ領域と同じ伝導形をもつ第5のドープ領域が更に含まれ、前記第1のドープ領域は前記第1のMOSFETの第1のソース/ドレイン領域で、前記第5のドープ領域は前記第1のMOSFETの第2のソース/ドレイン領域で、前記第3のドープ領域は前記第1のMOSFETのチャネルであり、前記第2のドープ領域上にあり、前記第2のドープ領域と同じ伝導形をもつ第6のドープ領域が更に含まれ、前記第2のドープ領域は前記第2のMOSFETの第1のソース/ドレイン領域で、前記第6のドープ領域は前記第2のMOSFETの第2のソース/ドレイン領域で、前記第1の酸化物層は前記第1のMOSFETのゲート酸化物であり、前記第2の酸化物層は前記第2のMOSFETのゲート酸化物層であり、
前記第1及び第2のMOSFETの各動作を制御するため、それぞれ第1及び第2のゲート酸化物層に隣接した第1及び第2の導電性要素を更に含む集積回路構造。
- 第1及び第2のMOSFETはトランジスタの相補MOSFET対を形成する請求項1記載の集積回路構造。
- 分離領域の材料は、電気的に絶縁性の材料を含む請求項1記載の集積回路構造。
- 分離領域の材料は、二酸化シリコンを含む請求項1記載の集積回路構造。
- 第1及び第2の導電性要素はポリシリコンを含み、それぞれ第1及び第2のMOSFETのゲートとして動作する請求項1記載の集積回路構造。
- 複数の層の少くとも1つは、第3及び第4のドープ領域中にドーパントを拡散させるためのドーパント源として働くドープ絶縁層を含む請求項1記載の集積回路構造。
- 第3及び第4のドープ領域のそれぞれは、チャネル領域を形成し、ドープ絶縁領域から拡散したドーパントは、各チャネル領域内にソース/ドレイン延長部を形成する請求項6記載の集積回路構造。
- 半導体層上の第1の電界効果トランジスタのソース領域及びドレイン領域から成るグループから選択された第1のデバイス領域を形成する工程;
半導体層上の第2の電界効果トランジスタのソース領域及びドレイン領域から成るグループから選択された第2のデバイス領域を形成する工程;
前記第1及び第2のデバイス領域間に配置された分離領域を形成する工程、前記分離領域は前記第1及び第2のデバイス領域間に配置された電気的に絶縁性材料のトレンチと、前記第1及び第2のデバイス領域上の電気的に絶縁性材料の層を含み;
前記第1のデバイス領域上に第1のドープされた絶縁層を形成する工程;
前記第2のデバイス領域上に第2のドープされた絶縁層を形成する工程;
前記第1及び第2のドープされた絶縁層及び前記第1及び第2のデバイス領域上に犠牲層を形成する工程;
前記第1のデバイス領域上に第3のドープされた絶縁層を形成する工程;
前記第2のデバイス領域上に第4のドープされた絶縁層を形成する工程;
前記第3のドープされた絶縁層を貫いて、前記第1のデバイス領域の上部表面まで第1の垂直トレンチを形成する工程;
前記第4のドープされた絶縁層を貫いて、前記第2のデバイス領域の上部表面まで第2の垂直トレンチを形成する工程;
前記第1及び第2のトレンチ中にドープされた半導体材料を形成する工程、ここで、第1及び第2のトレンチ中のドープされた半導体材料の伝導形は、第1及び第2の下のデバイス領域の伝導形と相対するもので、前記第1のトレンチ中のドープされた半導体材料は第1の電界効果トランジスタのチャネル領域を形成し、前記第2のトレンチ中のドープされた半導体材料は第2の電界効果トランジスタのチャネル領域を形成し;
前記第1のデバイス領域上に第1の半導体層を形成する工程;
前記第2のデバイス領域上に第2の半導体層を形成する工程;
前記第3及び4のドープされた絶縁層及び前記第1及び第2の半導体層の一部を残して、前記第3及び4のドープされた絶縁層及び前記第1及び第2の半導体層を除去し、犠牲層を露出する工程;
エッチングを用いて、前記第3及び4のドープされた絶縁層及び前記第1及び第2の半導体層の残りの部分下の犠牲層部分を含む犠牲層を除去して、前記第1及び第2のトレンチのドープされた半導体材料の一部を露出する工程;
前記第1及び第2のトレンチ中のドープされた半導体の露出された一部上に、第1及び第2のゲート酸化物材料を形成する工程;
及び第1及び第2のゲートを形成し、前記第1のゲートは第1のゲート酸化物材料と電気的に接触し、前記第2のゲートは第2のゲート酸化物材料と電気的に接触する工程を含む複数の電界効果トランジスタを有する半導体構造の作製方法。
- ドーパントは第1、第2、第3及び第4のドープされた絶縁層から拡散し、第1及び第2の電界効果トランジスタのチャネル内に延長部を形成する請求項8記載の方法。
- 分離領域の材料は二酸化シリコンを含む請求項8記載の方法。
- 分離領域の形成工程は更に、第1及び第2の半導体領域上に分離領域の一部を形成することを含む請求項8記載の方法。
- 第1及び第3のドープされた絶縁層の材料はBTEOSを含み、第2及び第4のドープされた絶縁層の材料はPTEOSを含み、犠牲層の材料は二酸化シリコンを含む請求項8記載の方法。
- 第1及び第2のドープされた絶縁層の形成工程は、第1及び第2のデバイス領域上に絶縁層を形成すること;第1のドープされた絶縁層を形成するために、第1のデバイス領域のドーパント形を、第1のデバイス領域上の絶縁層の一部にドーピングすること;第2のドープされた絶縁層を形成するために、第2のデバイス領域のドーパント形を、第2のデバイス領域上の絶縁層の一部にドーピングすることを含む請求項8記載の方法。
- 第1のデバイス領域上の絶縁層の一部をドーピングする工程及び第2のデバイス領域上の絶縁層の一部をドーピングする工程は、アンドープ領域をマスクすること及びマスクされない領域中に、所望のドーパント形を注入することを含む請求項13記載の方法。
- 第1のデバイス領域上の一部にドーピングする工程及び第2のデバイス領域上の一部にドーピングする工程は、アンドープ領域をマスクし、マスクされない領域中に所望のドーパント形を注入することを含む請求項13記載の方法。
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2001
- 2001-12-26 US US10/036,020 patent/US6773994B2/en not_active Expired - Lifetime
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KR100905210B1 (ko) | 2009-07-01 |
JP2013102193A (ja) | 2013-05-23 |
GB2383685A (en) | 2003-07-02 |
TW550811B (en) | 2003-09-01 |
KR20030055168A (ko) | 2003-07-02 |
US6773994B2 (en) | 2004-08-10 |
JP2003224202A (ja) | 2003-08-08 |
GB2383685B (en) | 2006-03-01 |
US20030119237A1 (en) | 2003-06-26 |
GB0220231D0 (en) | 2002-10-09 |
JP5579280B2 (ja) | 2014-08-27 |
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