KR102257933B1 - 평탄화에 의한 감소된 땜납 패드 토폴로지 차이를 포함하는 전자 구조를 제조하는 방법, 및 대응하는 전자 구조 - Google Patents
평탄화에 의한 감소된 땜납 패드 토폴로지 차이를 포함하는 전자 구조를 제조하는 방법, 및 대응하는 전자 구조 Download PDFInfo
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- KR102257933B1 KR102257933B1 KR1020167001992A KR20167001992A KR102257933B1 KR 102257933 B1 KR102257933 B1 KR 102257933B1 KR 1020167001992 A KR1020167001992 A KR 1020167001992A KR 20167001992 A KR20167001992 A KR 20167001992A KR 102257933 B1 KR102257933 B1 KR 102257933B1
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- solder
- metal layer
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- chip
- solder pad
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- 229910000679 solder Inorganic materials 0.000 title claims abstract description 136
- 238000004519 manufacturing process Methods 0.000 title 1
- 229910052751 metal Inorganic materials 0.000 claims abstract description 69
- 239000002184 metal Substances 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 238000007747 plating Methods 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 4
- 238000013467 fragmentation Methods 0.000 claims description 3
- 238000006062 fragmentation reaction Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims 2
- 239000011810 insulating material Substances 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
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Abstract
Description
도 1b는 도 1a의 칩이 기판 위에 배치되는 것을 예시한다.
도 1c는 땜납 범프들의 상이한 높이들 때문에 낮은 신뢰성 전기적 연결들을 초래하는, 리플로우 이후의 도 1b의 구조를 예시한다.
도 2a는 상이한 높이들을 갖는 오목한 땜납 범프들을 초래하는, 상이한 높이들의 땜납 패드들 또는 땜납 영역들을 갖는 종래의 칩의 간략화된 단면도이다.
도 2b는 땜납 범프들의 상이한 높이들 때문에 낮은 신뢰성 전기적 연결들을 초래하는, 기판상에 배치된 도 2a의 칩을 예시한다.
도 3은 땜납 패드들 또는 땜납 영역들이 상이한 높이들을 가지고 유전체 부분이 땜납 패드들/영역들 사이에 형성되는 칩의 단순화된 토폴로지를 예시한다.
도 4는 블랭킷-퇴적된 금속 시드 층과, 도금 처리되지 않은 부분들 위에 형성된 패터닝된 레지스트 층을 예시한다.
도 5은 도금 프로세스 이후의 칩을 예시한다.
도 6은 파선으로서 평탄화 목표를 가진 칩을 예시한다.
도 7은 금속 패드들을 평탄화하는 평탄화 이후에 이들 상부 면들이 동일 평면에 있는 칩을 예시한다.
도 8은 금속 패드들 위에 퇴적된 땜납의 균일 층을 예시한다.
도 9는 레지스트 제거되고 시드 층이 다시 에칭된 것을 예시한다.
도 10은 기판 위에 배치된 최종 칩에서, 리플로우 프로세스에 의해 땜납이 대향하는 패드들 사이에 신뢰성 있는 본드를 형성하게 하도록 모든 패드들 위의 땜납이 기판상의 대응하는 패드들을 터치하거나 또는 아주 작은 거리만큼 분리되는 것을 예시한다.
도 11은 도금된 금속 층이 레지스트 층보다 어떻게 낮게 형성될 수 있고, 그래서 금속 층과 레지스트 층 양자가 실질적으로 평탄화되는 것을 예시한다.
도 12는 본 발명의 일 실시예에서 사용될 수 있는 다양한 단계들을 식별하는 흐름도이다.
동일 또는 유사한 요소들에는 동일한 참조부호가 부여된다.
Claims (20)
- 땜납 패드 상의 평탄화를 위한 방법으로서,
제1 표면, 및 상기 제1 표면에 대향하는 제2 표면을 갖는 전자 디바이스를 제공하는 단계;
상기 제1 표면 위의 제1 거리에 제1 땜납 패드를 제공하고 상기 제1 표면 위의 제2 거리에 제2 땜납 패드를 제공하는 단계 - 상기 제1 거리는 상기 제2 거리와 상이함 -;
상기 제1 땜납 패드와 상기 제2 땜납 패드 사이에 유전체 층을 제공하는 단계;
상기 유전체 층을 제공하는 단계 이후에, 상기 유전체 층의 높이보다 높게 상기 제1 땜납 패드 위에 제1 금속 층 부분을 도금하는 단계로서, 상기 도금하는 단계 직후에 상기 제1 금속 층 부분이 임의의 절연 재료 위로 연장되도록 하는, 상기 제1 금속 층 부분을 도금하는 단계;
상기 유전체 층을 제공하는 단계 이후에, 상기 제1 금속 층 부분을 도금하는 단계와 동시에, 상기 유전체 층의 높이보다 높게 상기 제2 땜납 패드 위에 제2 금속 층 부분을 도금하는 단계로서, 상기 도금하는 단계 직후에 상기 제2 금속 층 부분이 임의의 절연 재료 위로 연장되도록 하는, 상기 제2 금속 층 부분을 도금하는 단계;
상기 제1 금속 층 부분 및 상기 제2 금속 층 부분을 평탄화하는 단계로서, 상기 제1 금속 층 부분 및 상기 제2 금속 층 부분을 형성하는 상기 재료만을 평탄화하도록 하여, 상기 제1 금속 층 및 상기 제2 금속 층이 제3 표면 및 제4 표면을 각각 갖도록 하고, 상기 제3 표면 및 상기 제4 표면은 동일 평면에 있고, 여전히 상기 유전체 층의 높이보다 높은 높이를 갖는, 상기 제1 금속 층 부분 및 상기 제2 금속 층 부분을 평탄화하는 단계;
상기 제1 금속 층 부분 위에 제1 땜납 층을 퇴적하는 단계; 및
상기 제2 금속 층 부분 위에 제2 땜납 층을 퇴적하는 단계 - 이에 따라 상기 제1 땜납 층의 상부 면이 상기 제2 땜납 층의 상부 면과 동일 평면에 있게 됨 -
를 포함하는 땜납 패드 상의 평탄화를 위한 방법. - 제1항에 있어서,
상기 도금된 제1 금속 층 부분은 상기 제1 땜납 패드에 연결된 제5 표면과, 상기 제5 표면에 대향하는 제6 표면을 가지고,
상기 도금된 제2 금속 층 부분은 상기 제2 땜납 패드에 연결된 제7 표면과, 상기 제7 표면에 대향하는 제8 표면을 가지고,
상기 유전체 층은 상기 제6 표면 및 제8 표면의 임의의 지점보다 상기 제1 표면에 더 근접한, 땜납 패드 상의 평탄화를 위한 방법. - 제1항에 있어서, 상기 전자 디바이스는 웨이퍼로부터의 단편화(singulation) 이후의 칩인, 땜납 패드 상의 평탄화를 위한 방법.
- 제3항에 있어서,
상기 제1 땜납 패드에 대응하는 제3 땜납 패드와, 상기 제2 땜납 패드에 대응하는 제4 땜납 패드를 갖는 기판에 대해 상기 칩을 배치하는 단계;
상기 제1 땜납 층을 상기 제3 땜납 패드에 본딩하는 단계; 및
상기 제2 땜납 층을 상기 제4 땜납 패드에 본딩하는 단계
를 더 포함하는 땜납 패드 상의 평탄화를 위한 방법. - 제4항에 있어서, 상기 제1 땜납 층을 상기 제3 땜납 패드에 본딩하는 단계와 상기 제2 땜납 층을 상기 제4 땜납 패드에 본딩하는 단계는 땜납 리플로우에 의한 것인, 땜납 패드 상의 평탄화를 위한 방법.
- 제4항에 있어서, 상기 제1 땜납 층을 상기 제3 땜납 패드에 본딩하는 단계와 상기 제2 땜납 층을 상기 제4 땜납 패드에 본딩하는 단계는 초음파 본딩에 의한 것인, 땜납 패드 상의 평탄화를 위한 방법.
- 제1항에 있어서,
상기 제1 금속 층 부분과 상기 제2 금속 층 부분을 평탄화하는 단계는 상기 제1 금속 층 부분과 상기 제2 금속 층 부분을 상기 유전체 부분보다 높게 평탄화하는 단계를 포함하는, 땜납 패드 상의 평탄화를 위한 방법. - 제1항에 있어서,
상기 전자 디바이스는 웨이퍼로부터의 단편화 이후의 칩이며, 상기 칩은 플립칩 발광 다이오드인, 땜납 패드 상의 평탄화를 위한 방법. - 제1항에 있어서, 상기 전자 디바이스는 웨이퍼로부터의 단편화 이후의 칩이며, 상기 칩은 집적 회로인, 땜납 패드 상의 평탄화를 위한 방법.
- 제1항에 있어서, 상기 평면은 상기 제1 표면에 평행한, 땜납 패드 상의 평탄화를 위한 방법.
- 제1항에 있어서,
상기 전자 디바이스의 상기 제1 표면은 제1 평면을 형성하고, 상기 제1 땜납 층의 상부 면 및 상기 제2 땜납 층의 상부 면의 평면은 상기 제1 평면에 평행하지 않은 제2 평면을 형성하는, 땜납 패드 상의 평탄화를 위한 방법. - 삭제
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