KR102404490B1 - 후면 커패시터 기법 - Google Patents
후면 커패시터 기법 Download PDFInfo
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- KR102404490B1 KR102404490B1 KR1020200077773A KR20200077773A KR102404490B1 KR 102404490 B1 KR102404490 B1 KR 102404490B1 KR 1020200077773 A KR1020200077773 A KR 1020200077773A KR 20200077773 A KR20200077773 A KR 20200077773A KR 102404490 B1 KR102404490 B1 KR 102404490B1
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- semiconductor substrate
- capacitor electrode
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- semiconductor
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- 239000003990 capacitor Substances 0.000 title claims abstract description 215
- 238000000034 method Methods 0.000 title claims description 29
- 239000004065 semiconductor Substances 0.000 claims abstract description 275
- 239000000758 substrate Substances 0.000 claims abstract description 203
- 229910052751 metal Inorganic materials 0.000 claims abstract description 76
- 239000002184 metal Substances 0.000 claims abstract description 76
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- 238000005859 coupling reaction Methods 0.000 claims description 24
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 16
- 229910052802 copper Inorganic materials 0.000 description 16
- 239000010949 copper Substances 0.000 description 16
- 230000008569 process Effects 0.000 description 12
- 238000005229 chemical vapour deposition Methods 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 7
- 238000005240 physical vapour deposition Methods 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- 229910052719 titanium Inorganic materials 0.000 description 7
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 7
- 229910052721 tungsten Inorganic materials 0.000 description 7
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- 229910000881 Cu alloy Inorganic materials 0.000 description 6
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- 238000000231 atomic layer deposition Methods 0.000 description 5
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- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 4
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- 238000009713 electroplating Methods 0.000 description 4
- 229910052735 hafnium Inorganic materials 0.000 description 4
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 4
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(iv) oxide Chemical compound O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 4
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 4
- 238000000206 photolithography Methods 0.000 description 4
- 229920002120 photoresistant polymer Polymers 0.000 description 4
- 229910021332 silicide Inorganic materials 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 210000000746 body region Anatomy 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052715 tantalum Inorganic materials 0.000 description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003985 ceramic capacitor Substances 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000609 electron-beam lithography Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
Description
도 1은 높은 커패시턴스 밀도를 갖는 후면 트렌치 커패시터를 포함하는 반도체 구조물의 일부 실시예의 단면도를 도시한다.
도 2는 높은 커패시턴스 밀도를 갖는 후면 트렌치 커패시터를 포함하는 반도체 구조물의 일부 실시예의 단면도를 도시한다.
도 3은 후면 트렌치 커패시터를 포함하는 3차원 IC의 일부 실시예의 단면도를 도시한다.
도 4 내지 도 11은 본 개시의 일부 실시예에 따라 반도체 구조물을 제조하는 일부 실시예를 총괄적으로 도시하는 일련의 단면도를 도시한다.
도 12는 본 개시에 따른 방법의 일부 실시예를 도시한 흐름도를 도시한다.
Claims (10)
- 반도체 구조물에 있어서,
전면 표면 및 후면 표면을 갖는 반도체 기판;
상기 전면 표면 위에 배치되는 전면 상호 연결 구조물 - 상기 전면 상호 연결 구조물은, 상기 반도체 기판의 전면 표면 내에 또는 상기 반도체 기판의 전면 표면 상에 배치되는 반도체 디바이스를 서로 동작 가능하게 커플링시키는 복수의 전면 금속 라인 및 비아를 포함함 - ;
상기 반도체 기판의 후면 표면 내에 배치되는 트렌치 - 상기 트렌치는, 상기 트렌치 내에 있는 내측 커패시터 전극, 상기 트렌치 내에 있고 상기 내측 커패시터 전극 위에 놓이는 커패시터 유전체층, 및 상기 트렌치 내에 있고 상기 커패시터 유전체층 위에 놓이는 외측 커패시터 전극으로 충전됨 - ; 및
상기 후면 표면 위에 배치되는 후면 상호 연결 구조물 - 상기 후면 상호 연결 구조물은, 상기 내측 커패시터 전극 및 상기 외측 커패시터 전극에 커플링되는 복수의 후면 금속 라인 및 비아을 포함함 - ;
를 포함하고,
상기 복수의 후면 금속 라인은 상기 복수의 전면 금속 라인보다 더 두꺼운 것인, 반도체 구조물. - 제1항에 있어서, 상기 트렌치의 하단 표면은 상기 반도체 기판 내의 반도체 트랜지스터 디바이스의 웰 영역의 하단 한계(bottom extent)로부터 이격되고 상기 웰 영역의 하단 한계 바로 아래에 있는, 반도체 구조물.
- 제1항에 있어서, 상기 트렌치의 하단 표면은 상기 반도체 기판 내의 반도체 트랜지스터 디바이스의 웰 영역으로부터 측방향으로 오프셋되고 상기 웰 영역과 수직 오버랩(overlap)을 갖는, 반도체 구조물.
- 제1항에 있어서, 상기 커패시터 유전체층은 상기 내측 커패시터 전극의 상부 표면, 하부 표면, 및 측벽을 봉지화하고, 상기 외측 커패시터 전극은, 상기 트렌치 내의 상기 커패시터 유전체층과 직접 접촉하는 하단 표면 및 외측 측벽을 갖는, 반도체 구조물.
- 제1항에 있어서, 상기 내측 커패시터 전극의 최외측 표면이 상기 커패시터 유전체층의 최외측 표면과, 한 평면 내에 있거나, 수평하거나, 한 평면 내에 있으면서 수평하도록 상기 내측 커패시터 전극은 상기 트렌치 외부로 연장되는, 반도체 구조물.
- 제1항에 있어서,
상기 트렌치의 측벽 및 상기 트렌치의 하단 표면을 라이닝하는 도핑된 영역을 더 포함하며, 상기 도핑된 영역은 상기 외측 커패시터 전극과 병렬로 전기적으로 커플링되는, 반도체 구조물. - 제1항에 있어서, 상기 외측 커패시터 전극은 u자 형상의 단면을 갖는, 반도체 구조물.
- 제1항에 있어서,
상기 트렌치 내에서 상기 내측 커패시터 전극과 상기 외측 커패시터 전극 사이에 배치되는 중간 커패시터 전극을 더 포함하는, 반도체 구조물. - 반도체 구조물에 있어서,
제1 전면 표면 및 제1 후면 표면을 갖는 제1 반도체 기판;
제2 전면 표면 및 제2 후면 표면을 갖는 제2 반도체 기판 - 상기 제2 반도체 기판은 상기 제1 반도체 기판 위에 배치됨 - ;
상기 제1 반도체 기판의 제1 전면 표면과 상기 제2 반도체 기판의 제2 전면 표면 사이에 배치되는 제1 상호 연결 구조물 - 상기 제1 상호 연결 구조물은, 상기 제1 반도체 기판의 제1 전면 표면 내에 또는 상기 제1 반도체 기판의 제1 전면 표면 상에 배치되는 제1 반도체 디바이스를 서로 동작 가능하게 커플링시키는 제1 복수의 금속 라인 및 비아를 포함함 - ;
상기 제1 상호 연결 구조물과 상기 제2 반도체 기판의 제2 전면 표면 사이에 배치되는 제2 상호 연결 구조물 - 상기 제2 상호 연결 구조물은, 상기 제2 반도체 기판의 제2 전면 표면 내에 또는 상기 제2 반도체 기판의 제2 전면 표면 상에 배치되는 제2 반도체 디바이스를 서로 동작 가능하게 커플링시키는 제2 복수의 금속 라인 및 비아를 포함함 - ;
상기 제1 반도체 기판의 제1 후면 표면 내에 배치되는 제1 트렌치 - 상기 제1 트렌치는, 제1 내측 커패시터 전극, 상기 제1 내측 커패시터 전극 위에 놓이는 제1 커패시터 유전체층, 및 상기 제1 커패시터 유전체층 위에 놓이는 제1 외측 커패시터 전극으로 충전됨 - ;
상기 제1 후면 표면 위에 배치되는 제3 상호 연결 구조물 - 상기 제3 상호 연결 구조물은, 상기 제1 내측 커패시터 전극 및 상기 제1 외측 커패시터 전극에 커플링된 제3 복수의 금속 라인 및 비아를 포함함 - ;
상기 제2 반도체 기판의 제2 후면 표면 내에 배치되는 제2 트렌치 - 상기 제2 트렌치는, 제2 내측 커패시터 전극, 상기 제2 내측 커패시터 전극 위에 놓이는 제2 커패시터 유전체층, 및 상기 제2 커패시터 유전체층 위에 놓이는 제2 외측 커패시터 전극으로 충전됨 - ; 및
상기 제2 후면 표면 위에 배치되는 제4 상호 연결 구조물 - 상기 제4 상호 연결 구조물은, 상기 제2 내측 커패시터 전극 및 상기 제2 외측 커패시터 전극에 커플링된 제4 복수의 금속 라인 및 비아를 포함함 - ;
를 포함하고,
상기 제3 및 제4 복수의 금속 라인은 상기 제1 및 제2 복수의 금속 라인보다 더 두꺼운 것인, 반도체 구조물. - 반도체 구조물을 형성하는 방법에 있어서,
반도체 기판의 전면 상에 반도체 디바이스를 형성하는 단계;
상기 반도체 기판의 전면 상에 전면 상호 연결 구조물 - 상기 전면 상호 연결 구조물은 상기 반도체 기판의 전면 상의 반도체 디바이스를 서로 동작 가능하게 커플링시키는 복수의 전면 금속 라인 및 비아를 포함함 - 을 형성하는 단계;
상기 반도체 기판의 후면 내에 트렌치를 형성하는 단계;
후면 커패시터를 설립하도록 상기 반도체 기판의 후면 상의 상기 트렌치 내에 도전층 및 절연층을 교호하여 형성하는 단계; 및
상기 반도체 기판의 후면 상에 후면 상호 연결 구조물 - 상기 후면 상호 연결 구조물은 상기 후면 커패시터의 커패시터 전극에 커플링되는 복수의 후면 금속 라인 및 비아를 포함함 - 을 형성하는 단계
를 포함하고,
상기 복수의 후면 금속 라인은 상기 복수의 전면 금속 라인보다 더 두꺼운 것인, 반도체 구조물을 형성하는 방법.
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