KR20050048323A - 이종 소자들의 웨이퍼 레벨 적층 구조와 방법 및 이를이용한 시스템-인-패키지 - Google Patents

이종 소자들의 웨이퍼 레벨 적층 구조와 방법 및 이를이용한 시스템-인-패키지 Download PDF

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Publication number
KR20050048323A
KR20050048323A KR1020030082227A KR20030082227A KR20050048323A KR 20050048323 A KR20050048323 A KR 20050048323A KR 1020030082227 A KR1020030082227 A KR 1020030082227A KR 20030082227 A KR20030082227 A KR 20030082227A KR 20050048323 A KR20050048323 A KR 20050048323A
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South Korea
Prior art keywords
chip
wafer
input
region
output pads
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KR1020030082227A
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English (en)
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KR100621992B1 (ko
Inventor
이강욱
오세용
송영희
김구성
Original Assignee
삼성전자주식회사
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Priority to KR1020030082227A priority Critical patent/KR100621992B1/ko
Priority to US10/899,175 priority patent/US7215033B2/en
Publication of KR20050048323A publication Critical patent/KR20050048323A/ko
Application granted granted Critical
Publication of KR100621992B1 publication Critical patent/KR100621992B1/ko
Priority to US11/727,760 priority patent/US7824959B2/en
Priority to US11/822,630 priority patent/US7786594B2/en
Priority to US12/805,321 priority patent/US8278766B2/en

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Abstract

본 발명은 이종 소자들의 웨이퍼 레벨 적층 구조와 방법 및 이를 이용한 시스템-인-패키지에 관한 것이다. 웨이퍼 레벨 적층 기술은 칩 크기가 모두 같은 동일 소자들에 대해서는 적용이 가능하나, 시스템-인-패키지의 경우와 같이 칩 크기가 다른 이종 소자들에 대해서는 적용하기가 어렵다. 본 발명은 이종 소자들의 칩 크기를 모두 동일하게 만들고 비아, 재배선, 접속 범프 등을 이용하여 이종 소자의 적층 구조를 웨이퍼 레벨에서 일괄적으로 구현한다. 따라서, 칩 레벨에서 이종 소자의 적층 구조를 구현하는 것에 비하여 양산성을 높이고 제조 비용을 절감할 수 있으며, 적층 구조의 안정성과 열적, 전기적 특성을 향상시킬 수 있고 패키지 크기를 칩 수준으로 줄일 수 있다.

Description

이종 소자들의 웨이퍼 레벨 적층 구조와 방법 및 이를 이용한 시스템-인-패키지 {structure and method of wafer level stack for devices of different kind and system-in-package using the same}
본 발명은 반도체 패키지 기술에 관한 것으로서, 보다 구체적으로는 종류가 다른 이종 소자들을 웨이퍼 레벨에서 적층한 구조와 이러한 구조를 구현하는 방법 및 이를 이용한 시스템-인-패키지에 관한 것이다.
반도체 패키지(package)는 반도체 소자를 외부 환경으로부터 보호하고 외부 전자 시스템(예컨대, 마더보드(motherboard))과의 전기적 접속 및 물리적 접합을 가능하게 한다. 오늘날의 패키지 기술은 반도체 소자의 성능과 최종 제품의 가격, 성능, 신뢰성 등을 좌우할 만큼 그 중요성이 매우 커지고 있다.
3차원 적층 기술은 최근에 개발된 고집적 패키지 기술 중의 하나로서, 칩 적층 패키지가 3차원 적층 기술을 이용한 대표적인 예이다. 그 동안 칩 적층 패키지는 주로 칩 레벨(chip level)에서 만들어져 왔으나, 최근에 웨이퍼 레벨(wafer level)에서 제조하는 방식이 개발되었다. 웨이퍼 레벨 적층 방식은 칩 적층 방식에 비하여 제조 공정이 간단하고 웨이퍼 레벨 칩 크기 패키지(wafer level chip size package)의 구현이 가능하기 때문에 양산성 및 제조 비용 면에서 유리한 장점을 가지고 있다.
한편, 최근 들어 종류가 서로 다른 이종(異種) 반도체 소자들을 하나의 패키지 안에 집적하는 시스템-인-패키지(system-in-package) 기술이 주목받고 있다. 시스템-인-패키지 기술은 멀티-칩 모듈(multi-chip module) 기술의 연장으로서, 반도체 제품의 성능과 기능을 향상시키면서 동시에 크기와 가격을 대폭 줄일 수 있는 차세대 패키지 기술이라 할 수 있다.
종래 기술에 따른 시스템-인-패키지의 한 예가 도 1에 도시되어 있다. 도 1에 도시된 바와 같이 시스템-인-패키지(10)는 여러 개의 이종 소자들(12, 13, 14)을 포함하여 구성된다. 이종 소자(12, 13, 14)는 접착제(15)를 사용하여 배선 기판(11) 위에 차례대로 적층되고 본딩 와이어(16)를 통하여 배선 기판(11)에 전기적으로 연결된다. 배선 기판(11)의 윗면에는 이종 소자(12, 13, 14)와 본딩 와이어(16) 등을 밀봉하기 위하여 에폭시 수지와 같은 밀봉제(17)가 형성되고, 배선 기판(11)의 밑면에는 외부 접속 단자인 솔더 볼(18)이 형성된다.
그런데, 이러한 종래의 시스템-인-패키지(10)는 집적되는 이종 소자들(12, 13, 14)의 칩 크기가 모두 다르기 때문에, 전술한 웨이퍼 레벨 적층 방식을 적용할 수 없는 문제점이 있다. 현재까지 알려진 웨이퍼 레벨 적층 기술은 칩 크기가 모두 같은 동일 소자들에 대해서는 적용이 가능하나, 칩 크기가 다른 이종 소자들에 대해서는 적용하기가 어려운 실정이다.
따라서, 본 발명의 목적은 종류가 서로 다른 이종 소자들의 웨이퍼 레벨 적층 구조와 그 방법을 제공하고자 하는 것이다.
본 발명의 또 다른 목적은 웨이퍼 레벨 적층 기술을 이용하여 시스템-인-패키지를 구현하고자 하는 것이다.
이러한 목적들을 달성하기 위하여, 본 발명은 이종 소자들의 칩 크기를 모두 동일하게 설계하여 웨이퍼 레벨에서의 적층을 가능하게 하고 이를 이용하여 시스템-인-패키지를 구현한다.
본 발명은 이종 소자 웨이퍼의 적층 구조를 제공한다. 본 발명에 따른 이종 소자 웨이퍼 적층 구조는, 각각 다수의 입출력 패드들을 가지는 다수의 제1 소자 칩들로 이루어지는 제1 웨이퍼와, 각각 다수의 입출력 패드들을 가지는 다수의 제2 소자 칩들로 이루어지는 제2 웨이퍼를 포함하며, 제1 소자 칩과 제2 소자 칩은 종류가 서로 다르며 크기가 서로 동일한 것이 특징이다.
본 발명에 따른 이종 소자 웨이퍼 적층 구조에 있어서, 각각의 제1 소자 칩은 입출력 패드들이 배치된 제1 소자 영역을 포함하고, 각각의 제2 소자 칩은 입출력 패드들이 배치된 제2 소자 영역과 제2 소자 영역을 둘러싸고 있는 제2 주변 영역을 포함할 수 있다. 또한, 제1 소자 칩은 제1 소자 영역을 둘러싸고 있는 제1 주변 영역을 더 포함할 수 있다. 이때, 제1 소자 영역의 크기는 제2 소자 영역의 크기보다 큰 것이 특징이다.
본 발명에 따른 이종 소자 웨이퍼 적층 구조에 있어서, 제1 소자 칩과 제2 소자 칩은 서로 동일한 위치에 형성된 다수의 비아들을 포함하는 것이 바람직하고, 비아들은 제1 소자 칩의 가장자리와 제2 소자 칩의 가장자리에 형성되는 것이 바람직하다. 또한, 제2 소자 칩의 입출력 패드들은 비아들과 각각 재배선에 의하여 연결될 수 있고, 각각의 비아 하부에는 접속 범프가 형성될 수 있다.
본 발명은 상기한 이종 소자 웨이퍼 적층 구조를 웨이퍼 레벨에서 적층하는 방법을 제공하며, 또한, 이종 소자의 웨이퍼 레벨 적층 구조와 방법을 이용한 시스템-인-패키지를 제공한다.
이하, 첨부 도면을 참조하여 본 발명의 실시예를 보다 상세하게 설명하도록 한다. 실시예를 설명함에 있어서, 본 발명이 속하는 기술 분야에 이미 잘 알려져 있는 기술 내용에 대해서는 설명을 생략한다. 이는 불필요한 설명을 생략함으로써 본 발명의 기술 내용을 보다 명확히 드러내기 위함이다. 마찬가지의 이유로 첨부 도면에 있어서 발명의 일부 구성요소는 다소 과장되거나 생략되거나 또는 개략적으로 도시되었으며, 각 구성요소들의 크기는 실제 크기를 전적으로 반영하는 것이 아니다. 각 도면에 있어서 동일한 구성요소 또는 대응하는 구성요소에 대해서는 동일한 참조 번호를 부여하였다.
아울러, 본 명세서에 사용되는 용어중에서 "이종 소자"는 통상적인 의미에서 종류가 다른 반도체 소자를 의미한다. 예를 들어, DRAM, SRAM, 플래시 메모리 등과 같은 메모리 소자뿐만 아니라, CPU 칩, 주문형 반도체 칩 등과 같은 비메모리 소자들을 모두 포함한다.
칩 레이아웃(chip layout)
본 발명의 실시예에 따른 이종 소자들의 칩 레이아웃을 도 3에 도시하였다. 비교를 위하여, 도 2에는 종래 기술에 따른 이종 소자들의 칩 레이아웃을 나타내었다.
도 2를 참조하면, 종래의 반도체 소자들(12, 13, 14)은 종류에 따라 각기 칩 크기가 서로 다르고 입출력 패드(12a, 13a, 14a)의 개수나 배치 간격도 서로 다르다. 그러나, 도 3에 도시된 바와 같이, 본 발명의 반도체 소자들(21, 31, 41)은 소자의 종류에 관계없이 모두 동일한 칩 크기를 가진다.
본 발명에 따른 이종 소자들(21, 31, 41)의 칩 크기는 종래의 이종 소자들 중에서 가장 칩 크기가 큰 소자(14)와 동일하거나 약간 크다. 도 3 내지 도 6은 동일한 경우이며, 후술하는 도 7은 약간 큰 경우이다.
제1 소자 칩(21)은 종래의 이종 소자 칩(14)을 그대로 이용하고, 제2 소자 칩(31)과 제3 소자 칩(41)은 종래의 이종 소자들(13, 12)에 각각 주변 영역(33, 43)을 부여함으로써 제1 소자 칩(21)과 동일한 크기로 만든다. 이때 종래의 칩 영역에 해당하는 부분을 '소자 영역'(22, 32, 42), 새로 부여된 가장자리 부분을 '주변 영역'(33, 43)이라 칭하겠다.
본 발명의 이종 소자 칩들(21, 31, 41)은 소자의 종류에 관계없이 모두 동일한 칩 크기를 가지는 한편, 동일한 개수, 동일한 위치, 동일한 형태의 비아(via; 25, 35, 45)를 갖는다. 비아(25, 35, 45)는 칩 가장자리 부분에 형성된다. 따라서, 제2 소자 칩(31)과 제3 소자 칩(41)에 있어서 비아(35, 45)는 각각 주변 영역(33, 43)에 형성된다. 비아(25, 35, 45)는 칩을 수직으로 관통하는 구멍 안에 전도성 물질이 채워진 것으로서 이종 소자의 적층시 상하 소자 간의 전기적 연결을 가능하게 한다.
소자 영역(22, 32, 42)은 종래의 칩 영역과 동일한 설계를 따르므로 입출력 패드(24, 34, 44) 또한 종래와 동일한 위치에 형성된다. 따라서, 제1 소자 칩(21)에서는 비아(25)가 입출력 패드(24)에 직접 형성되고, 제2 소자 칩(31)과 제3 소자 칩(41)에서는 비아(35, 45)와 입출력 패드(34, 44)가 재배선(36, 46)에 의하여 연결된다.
후술하는 도 7의 경우는 제1 소자 칩(21-1)에도 주변 영역(23)을 부여하여 입출력 패드(24)와 비아(25)를 다른 위치에 형성한 예이다. 이처럼 입출력 패드(24)에 직접 비아(25)를 형성하기 곤란한 경우에는 제1 소자 칩(21)도 제2 소자 칩(31)이나 제3 소자 칩(41)과 같은 칩 레이아웃을 따르도록 할 수 있다.
이상 설명한 바와 같이, 이종 소자들(21, 31, 41)이 모두 동일한 칩 크기를 가지도록 칩 레이아웃을 설정하면, 웨이퍼 레벨 적층 방식을 이용하는 것이 가능해질 뿐만 아니라, 시스템-인-패키지에 적용할 경우 적층 구조의 안정성과 열적, 전기적 특성을 향상시킬 수 있고 패키지 전체 크기를 줄일 수 있다.
이종 소자 적층 구조
본 발명의 실시예에 따른 이종 소자들의 적층 구조가 도 4에 도시되어 있다. 도 4에 잘 나타난 바와 같이, 적층되는 이종 소자 칩들(21, 31, 41)은 주변 영역(33, 43)이 부가됨으로써 모두 동일한 칩 크기를 가지고 있다.
이종 소자 칩들(21, 31, 41) 사이의 전기적 연결은 비아(25, 35, 45)와 접속 범프(27, 37, 47)에 의하여 이루어진다. 비아(25, 35, 45)는 칩을 수직으로 관통하는 구멍 안에 전도성 물질이 채워진 것으로서 각 칩들의 동일 위치에 형성된다. 접속 범프(27, 37, 47)는 각각의 비아(25, 35, 45) 하부에 형성되며, 이종 소자 적층시 아래쪽 칩의 비아에 물리적으로 접합된다. 전술했듯이, 서로 다른 위치에 형성된 비아(35, 45)와 입출력 패드(34, 44)는 재배선(36, 46)에 의하여 전기적으로 연결된다.
각각의 이종 소자 칩들(21, 31, 41)은 입출력 패드(24, 34, 44)의 개수가 서로 다를 수 있기 때문에, 각 칩에 형성된 비아(25, 35, 45), 재배선(36, 46), 접속 범프(27, 37, 47) 모두가 전기적 연결에 이용되는 것은 아니다. 그 중의 일부는 열 방출용이나 칩 선택용으로 이용되며, 또는 단순히 상하 칩 사이의 접합용으로만 사용되기도 한다.
이종 소자의 웨이퍼 레벨 적층 방법 및 그 구조
도 4에 도시된 이종 소자들의 적층 구조는 웨이퍼 레벨에서 구현된다. 도 5a 내지 도 5g는 본 발명의 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 방법과 그 구조를 나타내는 단면도이다.
도 5a는 이종 소자의 웨이퍼들(20, 30, 40)을 도시하고 있다. 각 웨이퍼(20, 30, 40)는 그 안에 형성된 다수의 소자 칩들(21, 31, 41)을 포함하며, 각 소자 칩들(21, 31, 41) 사이에는 절단선(28, 38, 48)이 마련되어 있다. 웨이퍼들(20, 30, 40)은 소자의 특성에 맞게 각각 최적화된 공정을 통하여 제조된다. 웨이퍼 제조 공정은 이미 잘 알려져 있으므로 설명을 생략한다. 다만, 웨이퍼 제조 과정에서 이종 소자들(21, 31, 41)이 모두 동일한 칩 크기를 가지도록 칩 레이아웃이 설정되어야 함은 물론이다.
구체적으로 설명하면, 제1 웨이퍼(20)는 다수의 제1 소자 칩들(21)로 이루어지고, 제1 소자 칩들(21)은 절단선(28)에 의하여 서로 구분된다. 본 실시예의 제1 소자 칩(21)은 소자 영역(22)만으로 이루어져 있다. 제1 소자 칩(21)의 가장자리에는 다수의 입출력 패드들(24)이 형성된다. 후술하는 도 7과 같이, 제1 소자 칩(21-1)도 주변 영역(23)을 포함할 수 있다.
제2 웨이퍼(30)는 다수의 제2 소자 칩들(31)로 이루어지며, 제2 소자 칩들(31)은 절단선(38)에 의하여 서로 구분된다. 제2 소자 칩(31)은 소자 영역(32)과 주변 영역(33)으로 이루어진다. 이때의 소자 영역(32)은 종래의 제2 소자 칩(도 2의 13)에 해당한다. 따라서, 제2 소자 칩(31)의 입출력 패드들(34)은 소자 영역(32)의 가장자리에 형성된다.
제3 웨이퍼(40)는 다수의 제3 소자 칩들(41)로 이루어지며, 제3 소자 칩들(41)은 절단선(48)에 의하여 서로 구분된다. 제3 소자 칩(41)은 소자 영역(42)과 주변 영역(43)으로 이루어진다. 이때의 소자 영역(42)은 종래의 제3 소자 칩(도 2의 12)에 해당한다. 따라서, 제3 소자 칩(41)의 입출력 패드들(44)은 소자 영역(42)의 가장자리에 형성된다.
웨이퍼 제조가 완료되면, 도 5b에 도시된 바와 같이, 각각의 이종 소자 칩(21, 31, 41)의 가장자리에 다수의 비아 구멍들(25a, 35a, 45a)을 형성한다. 이종 소자 칩들(21, 31, 41) 간에 비아 구멍들(25a, 35a, 45a)의 위치는 모두 동일하다. 따라서, 제1 소자 칩(21)의 비아 구멍(25a)은 입출력 패드(도 5a의 24)에 형성되며, 제2 소자 칩(31)과 제3 소자 칩(41)의 비아 구멍(35a, 45a)은 주변 영역(33, 43)에 형성된다. 후술하는 도 7과 같이 제1 소자 칩(21-1)이 주변 영역(23)을 가지는 경우에는 제1 소자 칩(21-1)의 비아 구멍(25a)도 주변 영역(33)에 형성된다. 비아 구멍(25a, 35a, 45a)은 레이저 드릴(laser drill)과 같은 방법에 의하여 형성할 수 있다.
이어서, 도 5c에 도시된 바와 같이, 비아 구멍 안에 각각 전도성 물질을 채워 넣어 비아(25, 35, 45)를 형성한다. 비아(25, 35, 45)는 웨이퍼(20, 30, 40)를 적층하였을 때 상하 소자들(21, 31, 41) 사이의 전기적 연결을 가능하게 한다. 그밖에 비아(25, 35, 45)는 소자에서 발생하는 열을 방출시키는 용도나, 특정 소자 칩을 선택하기 위한 칩 선택 용도로도 사용된다.
비아(25, 35, 45)를 형성하고 나면, 도 5d에 도시된 바와 같이, 각각의 비아(35, 45)와 입출력 패드(34, 44)를 잇는 재배선(36, 46)을 형성한다. 재배선(36, 46)은 비아(35, 45)와 입출력 패드(34, 44)의 위치가 서로 다를 때 그 둘을 전기적으로 연결시키기 위한 것이며, 비아(35, 45)의 역할에 따라 열 방출용이나 칩 선택용으로 사용되기도 한다. 본 실시예의 경우, 제1 소자 칩(21)은 비아(25)가 입출력 패드에 직접 형성되기 때문에 재배선이 필요 없지만, 후술하는 도 7의 경우처럼 비아(25)와 입출력 패드(24)의 위치가 다르면 재배선(26)으로 서로 연결시킨다.
이어서, 도 5e에 도시된 바와 같이, 각각의 비아(25, 35, 45) 하부에 접속 범프(27, 37, 47)를 형성한다. 접속 범프(27, 37, 47)는 상하 소자(21, 31, 41) 사이를 전기적으로 연결함은 물론, 웨이퍼들(20, 30, 40) 사이의 적층이 가능하도록 한다. 따라서, 접속 범프(27, 37, 47)의 일부는 전기적 연결, 열 방출, 칩 선택 등의 용도 외에 단순히 상하 칩 사이의 접합용으로만 사용될 수도 있다. 본 실시예의 접속 범프(27, 37, 47)는 비아(25, 35, 45) 하부에 형성되지만, 후술하는 도 8과 같이 비아 상부 쪽에도 형성할 수 있다.
이어서, 도 5f에 도시된 바와 같이, 이종 소자 웨이퍼들(20, 30, 40)을 적층한다. 이때, 위쪽 웨이퍼(30, 40)의 하부에 형성된 접속 범프(37, 47)가 아래쪽 웨이퍼(20, 30)의 상부에 형성된 비아(25) 또는 재배선(36)과 접합되면서 웨이퍼 적층 구조가 만들어진다.
웨이퍼 적층을 완료하고 나면, 절단선(28, 38, 48)을 따라 웨이퍼들(20, 30, 40)을 동시에 절단한다. 따라서, 도 5g 및 도 4에 도시된 바와 같은 개별 칩(21, 31, 41) 단위의 이종 소자 적층 구조가 얻어진다.
이와 같이, 이종 소자들(21, 31, 41)의 칩 크기를 동일하게 만들고 비아(25, 35, 45), 재배선(26, 36, 46), 접속 범프(27, 37, 47) 등을 이용하면, 웨이퍼 레벨에서의 제조 공정을 통하여 이종 소자의 적층 구조를 일괄적으로 구현할 수 있다. 따라서, 칩 레벨에서 이종 소자의 적층 구조를 구현하는 것에 비하여 양산성을 높이고 제조 비용을 절감할 수 있다.
웨이퍼 레벨 적층 기술을 이용한 시스템-인-패키지
도 6은 본 발명의 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 구조를 시스템-인-패키지(50)에 적용한 예이다.
도 6을 참조하면, 배선 기판(51)의 상부에는 웨이퍼 레벨에서 제조된 이종 소자들(21, 31, 41)의 적층 구조가 제1 소자 칩(21)의 접속 범프(27)를 통하여 직접 접합된다. 또한, 각각의 이종 소자 칩들(21, 31, 41)과 배선 기판(51) 사이의 전기적 연결은 비아(25, 35, 45), 재배선(26, 36, 46), 접속 범프(27, 37, 47)를 통하여 이루어진다. 따라서, 종래의 시스템-인-패키지(도 1의 10)에 비하여 전기적 연결 경로를 보다 짧게 구현할 수 있고 시스템-인-패키지(50)의 전체 크기를 칩 수준으로 줄일 수 있다.
한편, 배선 기판(51)의 윗면에는 이종 소자의 적층 구조를 밀봉하기 위하여 에폭시 수지와 같은 밀봉제(57)가 형성되고, 배선 기판(51)의 밑면에는 외부 접속 단자인 솔더 볼(58)이 형성된다.
웨이퍼 레벨 적층 구조의 다른 예
도 7은 본 발명의 다른 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 구조를 나타내고 있다. 도 7은 전술한 도 5d에 대응하는 단계를 도시하고 있다.
도 7을 참조하면, 본 실시예의 이종 소자 웨이퍼(20-1, 30-1, 40-1) 적층 구조는 제2 소자 칩(31-1) 및 제3 소자 칩(41-1)과 마찬가지로 제1 소자 칩(21-1)이 주변 영역(23)을 가지는 것이 특징이다. 제1 소자 칩(21-1)의 입출력 패드(24)에 직접 비아(25)를 형성하기 곤란한 경우에는 이와 같이 제1 소자 칩(21-1)에도 주변 영역(23)을 부여할 수 있다. 그 밖의 사항들은 전술한 실시예의 경우와 동일하므로 설명을 생략한다.
웨이퍼 레벨 적층 구조의 또 다른 예
도 8은 본 발명의 또 다른 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 구조를 나타내고 있다. 도 8은 전술한 도 5f에 대응하는 단계를 도시하고 있다.
도 8을 참조하면, 본 실시예의 이종 소자 웨이퍼(20-2, 30-2, 40-2) 적층 구조는 제1 소자 칩(21)과 제2 소자 칩(31)의 상하부에 각각 접속 범프(27a, 27b, 37a, 37b)를 형성한 것이 특징이다. 따라서, 웨이퍼 적층시, 제1 웨이퍼(20-2)의 상부에 형성된 접속 범프(27a)와 제2 웨이퍼(30-2) 하부에 형성된 접속 범프(37b)가 서로 접합되고, 제2 웨이퍼(30-2) 상부에 형성된 접속 범프(37a)와 제3 웨이퍼(40-2) 하부에 형성된 접속 범프(47)가 서로 접합된다. 그 밖의 사항들은 전술한 실시예의 경우와 동일하므로 설명을 생략한다.
시스템-인-패키지의 다른 예
도 9는 본 발명의 다른 실시예에 따른 시스템-인-패키지(50-1)를 나타내고 있다. 도 9를 참조하면, 각각의 이종 소자 칩들(21-2, 31-2, 41-2)은 입출력 패드(34, 44)가 배선 기판(51) 쪽을 향하도록 뒤집어진 상태로 배선 기판(51)에 접합된다. 따라서, 적층 구조 제조 단계에서 각 소자 칩(21-2, 31-2, 41-2)의 하부 쪽이 아니라 상부 쪽에 접속 범프(27, 37, 47)를 형성하여 적층 구조를 만든 다음, 적층 구조를 뒤집어 배선 기판(51)에 접합한다. 이와 같은 구조에서는 가장 위쪽에 위치하는 제3 소자 칩(41-2)에 비아를 형성하지 않을 수 있다. 그 밖의 사항들은 전술한 실시예의 경우와 동일하므로 설명을 생략한다.
이상 설명한 바와 같이, 본 발명은 종류가 서로 다른 이종 소자들의 적층 구조를 웨이퍼 레벨에서 일괄적으로 구현할 수 있다. 따라서, 칩 레벨에서 이종 소자의 적층 구조를 구현하는 것에 비하여 양산성을 높일 수 있고 제조 비용을 절감할 수 있다. 또한, 적층 구조의 안정성과 열적, 전기적 특성을 향상시킬 수 있고 패키지 크기를 칩 수준으로 줄일 수 있다.
본 명세서와 도면에는 본 발명의 바람직한 실시예에 대하여 개시하였으며, 비록 특정 용어들이 사용되었으나, 이는 단지 본 발명의 기술 내용을 쉽게 설명하고 발명의 이해를 돕기 위한 일반적인 의미에서 사용된 것이지, 본 발명의 범위를 한정하고자 하는 것은 아니다. 여기에 개시된 실시예 외에도 본 발명의 기술적 사상에 바탕을 둔 다른 변형예들이 실시 가능하다는 것은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 자명한 것이다.
도 1은 종래 기술에 따른 이종 소자들의 칩 레벨 적층 기술을 이용한 시스템-인-패키지를 나타내는 단면도이다.
도 2는 종래 기술에 따른 이종 소자들의 칩 레이아웃을 나타내는 평면도이다.
도 3은 본 발명의 실시예에 따른 이종 소자들의 칩 레이아웃을 나타내는 평면도이다.
도 4는 본 발명의 실시예에 따른 이종 소자들의 적층 구조를 나타내는 분해 사시도이다.
도 5a 내지 도 5g는 본 발명의 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 방법 및 그 구조를 나타내는 단면도이다.
도 6은 본 발명의 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 기술을 이용한 시스템-인-패키지를 나타내는 단면도이다.
도 7은 본 발명의 다른 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 구조를 나타내는 단면도이다.
도 8은 본 발명의 또 다른 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 구조를 나타내는 단면도이다.
도 9는 본 발명의 다른 실시예에 따른 이종 소자들의 웨이퍼 레벨 적층 기술을 이용한 시스템-인-패키지를 나타내는 단면도이다.
<도면에 사용된 참조 번호의 설명>
10: 시스템-인-패키지(system-in-package; SiP)
11: 배선 기판(PCB)
12, 13, 14: 이종 소자들(devices of different kind)
12a, 13a, 14a: 입출력 패드(I/O pad)
15: 접착제(adhesive)
16: 본딩 와이어(bonding wire)
17: 밀봉제(encapsulant)
18: 솔더 볼(solder ball)
20, 30, 40, 20-1, 30-1, 40-1, 20-2, 30-2, 40-2: 웨이퍼(wafer)
21, 31, 41, 21-1, 31-1, 41-1, 21-2, 31-2, 41-2: 이종 소자들(devices of different kind)
22, 32, 42: 소자 영역(device region)
23, 33, 43: 주변 영역(peripheral region)
24, 34, 44: 입출력 패드(I/O pad)
25, 35, 45: 비아(via)
25a, 35a, 45a: 비아 구멍(via hole)
26, 36, 46: 재배선(rerouting line)
27, 37, 47, 27a, 27b, 37a, 37b: 접속 범프(connection bump)
28, 38, 48: 절단선(sawing line)
50, 50-1: 시스템-인-패키지(system-in-package; SiP)
51: 배선 기판(PCB)
57: 밀봉제(encapsulant)
58: 솔더 볼(solder ball)

Claims (16)

  1. 각각 다수의 입출력 패드들을 가지는 다수의 제1 소자 칩들로 이루어지는 제1 웨이퍼와, 각각 다수의 입출력 패드들을 가지는 다수의 제2 소자 칩들로 이루어지는 제2 웨이퍼를 포함하며,
    상기 제1 소자 칩과 상기 제2 소자 칩은 종류가 서로 다르며 크기가 서로 동일한 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 구조.
  2. 제1 항에 있어서, 상기 각각의 제1 소자 칩은 상기 입출력 패드들이 배치된 제1 소자 영역을 포함하고, 상기 각각의 제2 소자 칩은 상기 입출력 패드들이 배치된 제2 소자 영역과 상기 제2 소자 영역을 둘러싸고 있는 제2 주변 영역을 포함하며, 상기 제1 소자 영역의 크기는 상기 제2 소자 영역의 크기보다 큰 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 구조.
  3. 제1 항에 있어서, 상기 각각의 제1 소자 칩은 상기 입출력 패드들이 배치된 제1 소자 영역과 상기 제1 소자 영역을 둘러싸고 있는 제1 주변 영역을 포함하고, 상기 각각의 제2 소자 칩은 상기 입출력 패드들이 배치된 제2 소자 영역과 상기 제2 소자 영역을 둘러싸고 있는 제2 주변 영역을 포함하며, 상기 제1 소자 영역의 크기는 상기 제2 소자 영역의 크기보다 큰 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 구조.
  4. 제1 항 내지 제3 항 중의 어느 한 항에 있어서, 상기 제1 소자 칩과 상기 제2 소자 칩은 서로 동일한 위치에 형성된 다수의 비아들을 포함하는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 구조.
  5. 제4 항에 있어서, 상기 비아들은 상기 제1 소자 칩의 가장자리와 상기 제2 소자 칩의 가장자리에 형성되는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 구조.
  6. 제4 항에 있어서, 상기 제2 소자 칩의 입출력 패드들은 상기 비아들과 각각 재배선에 의하여 연결되는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 구조.
  7. 제4 항에 있어서, 상기 각각의 비아 하부에는 접속 범프가 형성되는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 구조.
  8. 각각 다수의 입출력 패드들을 가지는 다수의 제1 소자 칩들로 이루어지는 제1 웨이퍼를 제공하는 단계와, 각각 다수의 입출력 패드들을 가지는 다수의 제2 소자 칩들로 이루어지는 제2 웨이퍼를 제공하는 단계와, 상기 제1 웨이퍼와 상기 제2 웨이퍼를 적층하고 상기 제1 소자 칩의 입출력 패드와 상기 제2 소자 칩의 입출력 패드를 전기적으로 연결하는 단계를 포함하며,
    상기 제1 소자 칩과 상기 제2 소자 칩은 종류가 서로 다르며 크기가 서로 동일한 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 방법.
  9. 제8 항에 있어서, 상기 제1 웨이퍼를 제공하는 단계는 상기 각각의 제1 소자 칩에 상기 입출력 패드들이 배치된 제1 소자 영역을 형성하는 단계를 포함하며, 상기 제2 웨이퍼를 제공하는 단계는 상기 각각의 제2 소자 칩에 상기 입출력 패드들이 배치된 제2 소자 영역과 상기 제2 소자 영역을 둘러싸고 있는 제2 주변 영역을 형성하는 단계를 포함하며, 상기 제1 소자 영역의 크기는 상기 제2 소자 영역의 크기보다 큰 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 방법.
  10. 제8 항에 있어서, 상기 제1 웨이퍼를 제공하는 단계는 상기 각각의 제1 소자 칩에 상기 입출력 패드들이 배치된 제1 소자 영역과 상기 제1 소자 영역을 둘러싸고 있는 제1 주변 영역을 형성하는 단계를 포함하며, 상기 제2 웨이퍼를 제공하는 단계는 상기 각각의 제2 소자 칩에 상기 입출력 패드들이 배치된 제2 소자 영역과 상기 제2 소자 영역을 둘러싸고 있는 제2 주변 영역을 형성하는 단계를 포함하며, 상기 제1 소자 영역의 크기는 상기 제2 소자 영역의 크기보다 큰 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 방법.
  11. 제8 항 내지 제10 항 중의 어느 한 항에 있어서, 상기 제1 소자 칩과 상기 제2 소자 칩의 동일한 위치에 다수의 비아들을 형성하는 단계를 더 포함하는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 방법.
  12. 제11 항에 있어서, 상기 비아들을 형성하는 단계는 레이저 드릴 방법에 의하여 이루어지는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 방법.
  13. 제11 항에 있어서, 상기 제2 소자 칩의 입출력 패드들과 상기 비아들을 각각 연결하는 재배선을 형성하는 단계를 더 포함하는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 방법.
  14. 제11 항에 있어서, 상기 각각의 비아 하부에 접속 범프를 형성하는 단계를 더 포함하는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 방법.
  15. 제11 항에 있어서, 상기 적층된 제1 웨이퍼와 제2 웨이퍼를 절단선을 따라 절단하는 단계를 더 포함하는 것을 특징으로 하는 이종 소자의 웨이퍼 레벨 적층 방법.
  16. 제15 항에 기재된 방법에 의하여 얻어지는 이종 소자의 적층 구조와, 상기 이종 소자의 적층 구조가 윗면에 접합된 배선 기판과, 상기 이종 소자의 적층 구조를 밀봉하기 위하여 상기 배선 기판의 윗면에 형성되는 밀봉제와, 상기 배선 기판의 밑면에 형성된 외부 접속 단자를 포함하는 시스템-인-패키지.
KR1020030082227A 2003-11-19 2003-11-19 이종 소자들의 웨이퍼 레벨 적층 구조와 방법 및 이를이용한 시스템-인-패키지 KR100621992B1 (ko)

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US10/899,175 US7215033B2 (en) 2003-11-19 2004-07-27 Wafer level stack structure for system-in-package and method thereof
US11/727,760 US7824959B2 (en) 2003-11-19 2007-03-28 Wafer level stack structure for system-in-package and method thereof
US11/822,630 US7786594B2 (en) 2003-11-19 2007-07-09 Wafer level stack structure for system-in-package and method thereof
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