CN204375736U - 一种半导体倒装结构 - Google Patents

一种半导体倒装结构 Download PDF

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Publication number
CN204375736U
CN204375736U CN201420839269.4U CN201420839269U CN204375736U CN 204375736 U CN204375736 U CN 204375736U CN 201420839269 U CN201420839269 U CN 201420839269U CN 204375736 U CN204375736 U CN 204375736U
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China
Prior art keywords
aluminium
chip
substrate
salient point
flip structure
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CN201420839269.4U
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王亚琴
梁志忠
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JCET Group Co Ltd
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Jiangsu Changjiang Electronics Technology Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/10Bump connectors; Manufacturing methods related thereto
    • H01L2224/15Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • H01L2224/161Disposition
    • H01L2224/16151Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/16221Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/16225Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation

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  • Wire Bonding (AREA)

Abstract

本实用新型涉及一种半导体倒装结构,属于半导体封装技术领域。它包括基板(1)和芯片(4),所述基板(1)正面设置有铝焊垫(2),所述芯片(4)正面电极上设置有铝凸点(3),所述芯片(4)的铝凸点(3)冷压焊于基板(1)的铝焊垫(2)上。本实用新型一种半导体倒装结构,其芯片倒装不需经过回流焊,避免了由于高温而造成的CTE不匹配引起的翘曲问题,芯片铝凸点与基板的铝层属于同钟金属焊接,结合良好,焊接点不会产生IMC(金属间化合物),提高了产品的可靠性;并且由于芯片背面的铝凸点直接冷压焊于基板铝层上,不会出现跑锡短路的问题,从而可以极大地提高芯片的密间距输出。

Description

一种半导体倒装结构
技术领域
本实用新型涉及一种半导体倒装结构,属于半导体封装技术领域。
背景技术
在半导体封装中,随着高导电、小尺寸的需求,半导体芯片与基板之间互联开始广泛采用倒装工艺。并且,随着芯片高I/O的输出,为减小芯片与基板之间焊接金属球之间的间距,目前主要是在芯片主动面的电极位置制作铜凸点,再在铜凸点上制作锡球,经过高温回流焊实现芯片凸点与基板之间的焊接。芯片铜凸点上的锡与基板之间实现焊接,必须通过高温回流焊。由于回流焊的温度非常高,过程中需要达到260摄氏度,在此过程中,由于基板本身材质结构比较复杂,在高温的情况下,由于基板、芯片、铜凸点CTE差异比较大,容易造成基板翘曲,从而影响芯片与基板之间的焊接质量,造成基板线路的破坏。另外由于芯片铜凸点通过锡球实现与基板的焊接,而在高温回流焊的过程中,锡容易熔化跑锡造成短路,所以一定程度上影响了芯片的密间距输出。
发明内容
本实用新型的目的在于克服上述不足,提供一种半导体倒装结构,其芯片倒装不需经过回流焊,避免了由于高温而造成的CTE不匹配引起的翘曲问题。
本实用新型的目的是这样实现的:一种半导体倒装结构,它包括基板和芯片,所述基板正面设置有铝焊垫,所述芯片正面电极上设置有铝凸点,所述芯片的铝凸点冷压焊于基板的铝焊垫上。
与现有技术相比,本实用新型具有以下有益效果:
1、铝材质比较软,所以芯片铝凸点与引线框上的铝层可以实现冷压焊接,不需要进行高温回流焊,避免了由于高温而造成的CTE不匹配引起的翘曲问题;
2、相对不同金属焊接,芯片铝凸点与基板的铝层属于同种金属焊接,结合良好,焊接点不会产生IMC(金属间化合物),提高了产品的可靠性;
3、由于芯片背面的铝凸点直接冷压焊于基板铝层上,不需要使用锡焊料,也就不会出现跑锡短路的问题,从而可以极大地提高芯片的密间距输出。
附图说明
图1为本实用新型一种半导体倒装结构的示意图。
其中:
基板1
铝焊垫2
铝凸点3
芯片4。
具体实施方式
本实用新型一种半导体倒装结构,它包括基板1和芯片4,所述基板1正面设置有铝焊垫2,所述芯片4正面电极上设置有铝凸点3,所述芯片4的铝凸点3冷压焊于基板1的铝焊垫2上。
其工艺方法如下:
步骤一、在芯片正面电极上制作铝凸点;
步骤二、在基板正面焊垫位置电镀铝;
步骤三、芯片通过超声波与冷压焊相结合的方式倒装于基板上。

Claims (1)

1.一种半导体倒装结构,其特征在于:它包括基板(1)和芯片(4),所述基板(1)正面设置有铝焊垫(2),所述芯片(4)正面电极上设置有铝凸点(3),所述芯片(4)的铝凸点(3)冷压焊于基板(1)的铝焊垫(2)上。
CN201420839269.4U 2014-12-26 2014-12-26 一种半导体倒装结构 Active CN204375736U (zh)

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CN204375736U true CN204375736U (zh) 2015-06-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11165010B2 (en) 2019-02-11 2021-11-02 International Business Machines Corporation Cold-welded flip chip interconnect structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11165010B2 (en) 2019-02-11 2021-11-02 International Business Machines Corporation Cold-welded flip chip interconnect structure

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