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논문 기본 정보

자료유형
학술저널
저자정보
Jinhong Liu (Harbin Institute of Technology) Xinyi Jing (Harbin Institute of Technology) Jieshi Chen (Shanghai University of Engineering Science) Kyung‑Wook Paik (KAIST) Peng He (Harbin Institute of Technology) Shuye Zhang (Harbin Institute of Technology)
저널정보
대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.20 No.3
발행연도
2024.5
수록면
352 - 361 (10page)
DOI
https://doi.org/10.1007/s13391-023-00475-8

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초록· 키워드

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A structure composed of various Cu–Ni–Sn IMCs would develop from severe Joule heat and excessive elemental diff usionunder high-density current in the solder joints of fl exible printed circuit (FPC). Herein, we fi rstly observed the evolution ofa Cu 6 Sn 5 + Cu 3 Sn/(Ni,Cu) 3 Sn 4 hybrid structure in a μ-Cu/NiAu/Sn/Cu solder joint for full intermetallic compounds (IMCs)interconnect of fl exible electronics under isothermal aging condition by in-situ TEM. The joint was divided into two regions,the IMC type on the right region remained unchanged with dwell time prolonging, while the ratio of Cu 3 Sn on the left regionat various dwell times fi tted the JMAK model when the kinetic parameter n picked 1.5, indicating that grain boundary diff usionwas the predominant mechanism for transporting Cu atoms. The nucleation and growth of Cu 3 Sn grains were fi nishedin the Cu 6 Sn 5 layer. The nucleation of a Cu 3 Sn grain with a spherical cap shape was fi rstly captured by HRTEM, and Cu 3 Sngrains underwent a transformation from columnar to equiaxed when the dwell time was increased, making the morphologyof Cu 3 Sn grains in a μ-Cu/NiAu/Sn/Cu solder joint signifi cantly diff erent from the situation in larger solder joints. This studyis expected to provide an in-depth study of the microstructural evolution of micro Cu/NiAu/Sn/Cu solder joints under agingcondition and thereby expand their application in the microelectronic industry.

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