KR20070030807A - 고유전율(k) 유전체가 있는 CMOS 소자 제조에서 문턱전압을 제어하는 장벽층의 선택적인 구현 - Google Patents
고유전율(k) 유전체가 있는 CMOS 소자 제조에서 문턱전압을 제어하는 장벽층의 선택적인 구현 Download PDFInfo
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- KR20070030807A KR20070030807A KR1020067025229A KR20067025229A KR20070030807A KR 20070030807 A KR20070030807 A KR 20070030807A KR 1020067025229 A KR1020067025229 A KR 1020067025229A KR 20067025229 A KR20067025229 A KR 20067025229A KR 20070030807 A KR20070030807 A KR 20070030807A
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- insulating interlayer
- dielectric constant
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Abstract
Description
Claims (54)
- 상보성 금속 산화물 반도체(CMOS) 구조로서,제1 소자 영역 및 제2 소자 영역을 갖는 반도체 기판을 포함하고,상기 제1 소자 영역은 제1 고유전율(k) 게이트 유전체 및 제1 게이트 컨덕터를 포함하는 적어도 하나의 제1 게이트 적층(stack)을 포함하고,상기 제2 소자 영역은 제2 고유전율(k) 게이트 유전체, 상기 제2 고유전율(k) 게이트 유전체 상부의 절연 중간층, 및 상기 절연 중간층 상부의 제2 게이트 컨덕터를 포함하는 적어도 하나의 제2 게이트 적층을 포함하고, 상기 절연 중간층은 상기 제1 소자 영역 문턱전압 및 평탄 대역 전압의 쉬프트(shift) 없이 상기 제2 소자 영역 문턱전압 및 평탄 대역 전압을 안정화시킬 수 있는 CMOS 구조.
- 제1항에 있어서,상기 제1 소자 영역은 nFET 소자를 포함하고, 상기 제2 소자 영역은 pFET 소자를 포함하는 CMOS 구조.
- 제1항에 있어서,상기 반도체 기판은 Si, Ge, SiGe, SiC, SiGeC, Ga, Gas, InAs, InP, 다른 Ⅲ/Ⅴ이나 Ⅱ/Ⅵ 화합물 반도체, 유기 반도체 또는 층상(layered) 반도체를 포함하는 CMOS 구조.
- 제1항에 있어서,상기 반도체 기판은 Si, SiGe, 실리콘-온-절연체 또는 실리콘 게르마늄-온-절연체를 포함하는 CMOS 구조.
- 제1항에 있어서,상기 제1 소자 영역은 상기 적어도 하나의 제1 게이트 적층에 인접한 상기 기판의 n형 도핑된 소스/드레인 영역을 더 포함하고,상기 제2 소자 영역은 상기 적어도 하나의 제2 게이트 적층에 인접한 상기 기판의 p형 도핑된 소스/드레인 영역을 더 포함하는 CMOS 구조.
- 제1항에 있어서,상기 제1 고유전율(k) 게이트 유전체 및 상기 제2 고유전율(k) 게이트 유전체는 동일한 물질을 포함하는 CMOS 구조.
- 제1항에 있어서,상기 제1 고유전율(k) 게이트 유전체 및 상기 제2 고유전율(k) 게이트 유전체는 상이한 물질을 포함하는 CMOS 구조.
- 제1항에 있어서,상기 제1 고유전율(k) 게이트 유전체 및 상기 제2 고유전율(k) 게이트 유전체는 산화물, 질화물, 산화질화물 또는 실리케이트를 포함하는 CMOS 구조.
- 제1항에 있어서,상기 제1 고유전율(k) 게이트 유전체 및 상기 제2 고유전율(k) 게이트 유전체는 HfO2, ZrO2, Al2O3, TiO2, La2O3, SrTiO3, LaAlO3, Y2O3, SiO2, 질화된 SiO2, 실리케이트, 질화물 또는 질화된 실리케이트를 포함하는 CMOS 구조.
- 제1항에 있어서,상기 절연 중간층은 절연 금속 질화물을 포함하는 CMOS 구조.
- 제10항에 있어서,상기 절연 금속 질화물은 산소를 더 포함하는 CMOS 구조.
- 제1항에 있어서,상기 절연 중간층은 질화알루미늄(AlN), 산화질화알루미늄(AlOxNy), 질화붕소(BN), 산화질화붕소(BOxNy), 질화갈륨(GaN), 산화질화갈륨(GaON), 질화인듐(InN), 산화질화인듐(InON) 또는 이들의 조합을 포함하는 CMOS 구조.
- 제1항에 있어서,상기 절연 중간층은 AlN 또는 AlOxNy를 포함하는 CMOS 구조.
- 제1항에 있어서,상기 절연 중간층은 약 1Å에서 약 25Å까지의 두께를 갖는 CMOS 구조.
- 제1항에 있어서,상기 제1 게이트 컨덕터 및 상기 제2 게이트 컨덕터는 동일한 물질을 포함하는 CMOS 구조.
- 제1항에 있어서,상기 제1 게이트 컨덕터 및 상기 제2 게이트 컨덕터는 상이한 물질을 포함하는 CMOS 구조.
- 제1항에 있어서,상기 제1 게이트 컨덕터 및 상기 제2 게이트 컨덕터는 Si, Ge, SiGe, SiGeC, W, Ir, Re, Ru, Ti, Ta, Hf, Mo, Nb, Ni, Al, 금속 실리사이드(silicides), 금속성 질화물(metallic nitrides) 또는 이들의 조합을 포함하는 CMOS 구조.
- 제1항에 있어서,상기 제2 게이트 컨덕터는 적어도 붕소로 도핑된 폴리실리콘을 포함하고,상기 제1 게이트 컨덕터는 적어도 인으로 도핑된 폴리실리콘을 포함하는 CMOS 구조.
- 상보성 금속 산화물 반도체(CMOS) 구조로서,nFET 소자 영역 및 pFET 소자 영역을 포함하는 반도체 기판;상기 nFET 소자 영역 내의 적어도 하나의 nFET 소자 - 상기 적어도 하나의 nFET 소자는 nFET 소자 채널 및 상기 nFET 소자 채널 상부의 적어도 하나의 제1 게이트 적층에 의해 분리되는 n형 소스 및 드레인 영역을 포함하고, 상기 적어도 하나의 게이트 적층은 하프늄 함유 고율전율(k) 게이트 유전체 및 게이트 컨덕터를 포함함 - ; 및상기 pFET 소자 영역 내의 적어도 하나의 pFET 소자 - 상기 적어도 하나의 pFET 소자는 pFET 소자 채널 및 상기 pFET 소자 채널 상부의 적어도 하나의 제2 게이트 적층에 의해 분리되는 p형 소스 및 드레인 영역을 포함하고, 상기 적어도 하나의 제2 게이트 적층은 하프늄 함유 고유전율(k) 게이트 유전체, 알루미늄 질화물 함유 절연 중간막 및 게이트 컨덕터를 포함하며, 상기 알루미늄 질화물 함유 절연 중간층은 상기 하프늄 함유 고율전율(k) 게이트 유전체 및 상기 게이트 컨덕터 사이에 위치하는 CMOS 구조.
- 제19항에 있어서,상기 반도체 기판은 Si, Ge, SiGe, SiC, SiGeC, Si-온-절연체, SiGe-온-절연체, Ga, Gas, InAs, InP, 다른 Ⅲ/Ⅴ이나 Ⅱ/Ⅵ 화합물 반도체, 유기 반도체 또는 적층 반도체를 포함하는 CMOS 구조.
- 제19항에 있어서,상기 알루미늄 질화물 함유 절연 중간층은 산소를 더 포함하는 CMOS 구조.
- 제19항에 있어서,상기 하프늄 함유 고유전율(k) 게이트 유전체는 HfO2, 하프늄 실리케이트 또는 산화질화 하프늄 실리콘인 CMOS 구조.
- 제19항에 있어서,상기 알루미늄 질화물 함유 절연 중간층은 약 1Å에서 약 25Å까지의 두께를 갖는 CMOS 구조.
- 제19항에 있어서,상기 제1 게이트 컨덕터 및 상기 제2 게이트 컨덕터는 동일한 물질을 포함하는 CMOS 구조.
- 제19항에 있어서,상기 제1 게이트 컨덕터 및 상기 제2 게이트 컨덕터는 상이한 물질을 포함하는 CMOS 구조.
- 제19항에 있어서,상기 제1 게이트 컨덕터 및 상기 제2 게이트 컨덕터는 Si, Ge, SiGe, SiGeC, W, Ir, Re, Ru, Ti, Ta, Hf, Mo, Nb, Ni, Al, 금속 실리사이드, 금속성 질화물 또는 이들의 조합을 포함하는 CMOS 구조.
- 제19항에 있어서,상기 제2 게이트 컨덕터는 적어도 붕소로 도핑된 폴리실리콘을 포함하고,상기 제1 게이트 컨덕터는 적어도 인으로 도핑된 폴리실리콘을 포함하는 CMOS 구조.
- 개선된 문턱전압 및 평탄 대역 전압 안정성을 갖는 상보성 금속 산화물 반도체(CMOS) 구조를 형성하는 방법으로서,제1 소자 영역 및 제2 소자 영역을 갖는 반도체 기판을 제공하는 단계;상기 제1 소자 영역 및 상기 제2 소자 영역을 포함하는 상기 반도체 기판 상부에 유전체 적층 - 상기 유전체 적층은 고유전율(k) 유전체 상부에 절연 중간층을 포함함 - 을 형성하는 단계;상기 제2 소자 영역으로부터 상기 절연 중간층을 제거하지 않고 상기 제1 소자 영역으로부터 상기 절연 중간층을 제거하는 단계;상기 제2 소자 영역의 상기 절연 중간층 및 상기 제1 소자 영역의 상기 고유전율(k) 유전체 상부에 게이트 컨덕터를 형성하는 단계; 및상기 제2 소자 영역에 적어도 하나의 게이트 적층 및 상기 제1 소자 영역에 적어도 하나의 게이트 적층을 제공하기 위하여 상기 게이트 컨덕터, 상기 절연 중간층 및 상기 고유전율(k) 유전체를 에칭하는 단계를 포함하는 방법.
- 제28항에 있어서,상기 절연 중간층은 절연 금속 질화물을 포함하는 방법.
- 제29항에 있어서,상기 절연 금속 질화물은 산소를 더 포함하는 방법.
- 제28항에 있어서,상기 절연 중간층은 질화알루미늄(AlN), 산화질화알루미늄(AlOxNy), 질화붕소(BN), 산화질화붕소(BOxNy), 질화갈륨(GaN), 산화질화갈륨(GaON), 질화인듐(InN), 산화질화인듐(InON) 또는 이들의 조합을 포함하는 방법.
- 제28항에 있어서,상기 절연 중간층은 AlN 또는 AlOxNy를 포함하는 방법.
- 제28항에 있어서,상기 고유전율(k) 유전체는 HfO2, 하프늄 실리케이트 또는 산화질화 하프늄 실리콘을 포함하는 방법.
- 제28항에 있어서,상기 절연 중간층은 증착 또는 열 성장(thermal growing)에 의해 형성되는 방법.
- 제34항에 있어서,상기 증착은 도금(plating), 스퍼터링(sputtering), 원자층 화학기상증착(ALCVD) 또는 금속 유기 화학기상증착(MOCVD)을 포함하는 방법.
- 제28항에 있어서,상기 고유전율(k) 유전체는 증착 또는 열 성장에 의해 형성되는 방법.
- 제36항에 있어서,상기 증착은 화학기상증착(CVD), 플라즈마-인핸스드 CVD(PECVD), 금속 유기 화학기상증착(MOCVD), 고밀도 화학기상증착(HDCVD), 도금, 스퍼터링, 기화(evaporation) 또는 화학 용액 증착을 포함하는 방법.
- 제36항에 있어서,상기 열 성장은 산화, 질화 또는 산화질화(oxynitridation)를 포함하는 방법.
- 제28항에 있어서,상기 게이트 컨덕터는 Si, Ge, SiGe, SiGeC, W, Ir, Re, Ru, Ti, Ta, Hf, Mo, Nb, Ni, Al, 금속 실리사이드, 금속성 질화물 또는 이들의 조합을 포함하는 방법.
- 제28항에 있어서,상기 제2 소자 영역으로부터 상기 절연 중간층을 제거하지 않고 상기 제1 소자 영역으로부터 상기 절연 중간층을 제거하는 단계는,상기 제2 소자 영역 상부에 블록(block) 마스크를 형성하는 단계 - 상기 제1 소자 영역은 노출됨 - ; 및상기 제1 소자 영역으로부터 상기 절연 중간층을 에칭하는 단계 - 상기 에칭하는 단계는 상기 제1 소자 영역의 상기 블록 마스크 및 상기 고유전율(k) 유전체를 실질적으로 에칭하지 않고 상기 절연 중간층을 제거하는 에칭액을 포함함 -를 포함하는 방법.
- 제40항에 있어서, 상기 블록 마스크는 패터닝된 포토레지스트 층을 포함하는 방법.
- 제41항에 있어서,상기 블록 마스크를 형성하는 단계는,상기 반도체 기판 상부에 포토레지스트 층을 전면 증착(blanket deposition)하는 단계;상기 포토레지스트 층을 방사(radiation) 패턴에 노출시키는 단계; 및상기 제2 소자 영역 위에 놓이는 상기 블록 마스크를 제공하기 위해 상기 패턴을 상기 포토레지스트 층으로 현상하는(develop) 단계를 포함하는 방법.
- 제40항에 있어서,상기 블록 마스크는 산화실리콘, 탄화실리콘, 질화실리콘, 탄화질화실리콘, 실스퀴록산(silsequioxanes), 실록산(siloxanes) 및 BPSG(boron phosphate silicate glass)로 구성된 그룹에서 선택되는 유전체를 포함하는 방법.
- 제40항에 있어서,상기 에칭액은 HCl 및 산화제를 포함하는 습식 에칭인 방법.
- 제44항에 있어서,상기 에칭액은 약 1에서 약 7까지의 pH 범위를 갖는 방법.
- 제45항에 있어서,상기 에칭액은 약 2에서 약 6까지의 pH 범위를 갖는 방법.
- 제44항에 있어서,상기 에칭액은 3:1의 HCl/H2O2 과산화 용액을 포함하는 방법.
- 반도체 구조를 형성하는 방법으로서,반도체 기판을 제공하는 단계;하프늄 실리케이트 층 상부에 알루미늄 질화물 함유 절연층을 포함하는 상기 반도체 기판 상부에 유전체 적층을 형성하는 단계; 및상기 하프늄 실리케이트 층을 실질적으로 에칭하지 않고 상기 알루미늄 질화 물 함유 절연층을 선택적으로 에칭하는 단계를 포함하는 방법.
- 제48항에 있어서,상기 에칭하는 단계는 HCl 및 산화제를 포함하는 습식 에칭을 포함하는 방법.
- 제49항에 있어서,상기 에칭액은 약 1에서 약 7까지의 pH 범위를 갖는 방법.
- 제49항에 있어서,상기 에칭액은 약 2에서 약 6까지의 pH 범위를 갖는 방법.
- 제49항에 있어서,상기 에칭액은 3:1의 HCl/H2O2 과산화 용액을 포함하는 방법.
- 제49항에 있어서,상기 에칭하는 단계 이전에 노출된 상기 유전체 적층의 나머지 부분을 남겨두고 상기 유전체 적층의 영역 상부에 블록 마스크를 형성하는 단계를 더 포함하 고,상기 습식 에칭은 상기 블록 마스크 또는 상기 하프늄 실리케이트 층을 실질적으로 에칭하지 않고 상기 유전체 적층의 상기 나머지 부분으로부터 상기 알루미늄 질화물 함유 절연층을 제거하는 방법.
- 제53항에 있어서,상기 블록 마스크는 포토레지스트, 산화실리콘, 탄화실리콘, 질화실리콘, 탄화질화실리콘, 실스퀴록산, 실록산 또는 BPSG(boron phosphate silicate glass)를 포함하는 방법.
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Cited By (2)
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US9219160B2 (en) | 2011-09-29 | 2015-12-22 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
US9018710B2 (en) | 2012-12-28 | 2015-04-28 | SK Hynix Inc. | Semiconductor device with metal gate and high-k materials and method for fabricating the same |
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CN101427386A (zh) | 2009-05-06 |
WO2005122286A3 (en) | 2009-04-16 |
JP2008511971A (ja) | 2008-04-17 |
KR100951227B1 (ko) | 2010-04-05 |
US20090152642A1 (en) | 2009-06-18 |
US7928514B2 (en) | 2011-04-19 |
CN101427386B (zh) | 2011-01-26 |
US7479683B2 (en) | 2009-01-20 |
EP1766691A4 (en) | 2011-06-29 |
US7745278B2 (en) | 2010-06-29 |
EP1766691B1 (en) | 2013-07-03 |
JP4711444B2 (ja) | 2011-06-29 |
EP1766691A2 (en) | 2007-03-28 |
TWI380378B (en) | 2012-12-21 |
WO2005122286A2 (en) | 2005-12-22 |
US7105889B2 (en) | 2006-09-12 |
US20110165767A1 (en) | 2011-07-07 |
US8193051B2 (en) | 2012-06-05 |
US7452767B2 (en) | 2008-11-18 |
US20050269635A1 (en) | 2005-12-08 |
US20050269634A1 (en) | 2005-12-08 |
US20090011610A1 (en) | 2009-01-08 |
US20060275977A1 (en) | 2006-12-07 |
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