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초록
We developed a new sputtered under bump metallurgy (UBM) based on Ni-20wt% Zn thin films for Pb-free solders. This study focuses on the interfacial reactions between two Pb-free solders (Sn3.0Ag0.5Cu and Sn1.0Ag0.7Cu) and a Ni-Zn alloy UBM. By adding Zn to Ni UBM, Zn is incorporated into intermetallic compounds (IMCs) to form a quaternary Cu-Ni-Zn-Sn phase at the solder/Ni-Zn interface after reflow and subsequent isothermal aging. The Ni-Zn UBM sufficiently reduces the interfacial reaction and IMCs formation rates as well as UBM consumption rates compared to a Ni UBM. In particular, the formation of (Ni, Cu)(3)Sn-4 IMC was significantly retarded by adding Zn into UBM.
키워드
Pb-free solders; Ni-Zn; Under bump metallization; Interfacial reactions; Microstructure; INTERFACIAL REACTION; INTERMETALLIC COMPOUND; THIN-FILM; XZN; METALLIZATION; RELIABILITY; MECHANISM; FAILURE; REFLOW; GROWTH
- 제목
- Sputtered Ni-Zn under bump metallurgy (UBM) for Sn-Ag-Cu solders
- 저자
- Kim, Tae Jin; Kim, Young Min; Kim, Young-Ho
- 발행일
- 2012-09
- 유형
- Article
- 권
- 535
- 페이지
- 33 ~ 38