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Ag/Sn/Ag 샌드위치 구조를 갖는 Backside Metallization을 이용한 고온 반도체 접합 기술

High-temperature Semiconductor Bonding using Backside Metallization with Ag/Sn/Ag Sandwich Structure

안성진|최진석
한국마이크로전자및패키징학회 (The Microelectronics And Packaging Society)|2020.03|마이크로전자 및 패키징학회지 (Jornal of the Microelectronics and Packaging Society)|제27권 제1호|pp. 1-7

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키워드

solderingbackside metallizationdie attachAg/Sn/Ag sandwich structurehigh-temperature semiconductor
주제분류재료공학

초록

The backside metallization process is typically used to attach a chip to a lead frame for semiconductor packaging because it has excellent bond-line and good electrical and thermal conduction. In particular, the backside metal with the Ag/Sn/Ag sandwich structure has a low-temperature bonding process and high remelting temperature because the interfacial structure composed of intermetallic compounds with higher melting temperatures than pure metal layers after die attach process. Here, we introduce a die attach process with the Ag/Sn/Ag sandwich structure to apply commercial semiconductor packages. After the die attachment, we investigated the evolution of the interfacial structures and evaluated the shear strength of the Ag/Sn/Ag sandwich structure and compared to those of a commercial backside metal (Au-12Ge).

Abstract

The backside metallization process is typically used to attach a chip to a lead frame for semiconductor packaging because it has excellent bond-line and good electrical and thermal conduction. In particular, the backside metal with the Ag/Sn/Ag sandwich structure has a low-temperature bonding process and high remelting temperature because the interfacial structure composed of intermetallic compounds with higher melting temperatures than pure metal layers after die attach process. Here, we introduce a die attach process with the Ag/Sn/Ag sandwich structure to apply commercial semiconductor packages. After the die attachment, we investigated the evolution of the interfacial structures and evaluated the shear strength of the Ag/Sn/Ag sandwich structure and compared to those of a commercial backside metal (Au-12Ge).

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