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3D 반도체 패키징 적용을 위한 Sn-58wt%Bi 솔더의 취성 개선 전략 리뷰

A Review of Strategies for Improving Brittleness in Sn-58wt%Bi Solder for 3D Semiconductor Packaging Applications

김종웅|박민규|김병준|박연수
한국마이크로전자및패키징학회 (The Microelectronics And Packaging Society)|2024.12|마이크로전자 및 패키징학회지 (Jornal of the Microelectronics and Packaging Society)|제31권 제4호|pp. 1-17|DOI doi.org/10.6117/kmeps.2024.31.4.001

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키워드

PackagingSolderSn-58BiBrittleLow melting point
주제분류재료공학

초록

3D 반도체 패키징 기술의 급속한 발전으로 전자 부품의 집적도가 현저히 증가함에 따라, 리플로우 공정 후 발생하는 warpage 및 열적 손상 방지를 위한 저융점 솔더의 중요성이 부각되고 있다. 특히, Sn-58Bi (wt.%) 솔더는 낮은 융점과 우수한 비용 효율성으로 주목받고 있으나, 높은 취성으로 인한 기계적 충격 저항성 저하가 주요 단점으로 지적되고있다. 본 연구에서는 Sn-58Bi 솔더의 취성 개선을 위한 다양한 전략을 체계적으로 고찰한다. 구체적으로, 합금 설계 최적화, 나노복합재료 첨가, 그리고 혁신적 공정 기법 적용을 통한 미세구조 제어 및 기계적 특성 향상 방안을 중점적으로 분석한다. 이를 통해 Sn-58Bi 솔더의 성능을 획기적으로 개선하여 차세대 3D 반도체 패키징 기술 발전에 기여할 수 있는실질적인 해결책을 제시하고자 한다.

Abstract

The rapid advancement of 3D semiconductor packaging technology has led to a significant increase in the integration density of electronic components, emphasizing the importance of low-melting-point solders in preventing warpage and thermal damage post-reflow processing. Sn-58Bi (wt.%) solder has garnered considerable attention due to its low melting point and cost-effectiveness. However, its high brittleness, resulting in poor resistance to mechanical shock, remains a critical limitation. This comprehensive review systematically examines various strategies for mitigating the brittleness of Sn-58Bi solder. We focus on three key approaches: optimized alloy design, incorporation of nanocomposite materials, and implementation of innovative processing techniques for microstructure control and mechanical property enhancement. Through this analysis, we aim to propose practical solutions for substantially improving the performance of Sn-58Bi solder, thereby contributing to the advancement of next-generation 3D semiconductor packaging technologies. This study provides valuable insights into the current state of research and potential future directions in low-temperature solder development for advanced electronic packaging applications.

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