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Description
Title: | Roles of Interfacial Reaction on Mechanical Properties of Solder Interfaces |
Author(s): | Liu, Pilin |
Doctoral Committee Chair(s): | Zhong, Sheng |
Department / Program: | Materials Science and Engineering |
Discipline: | Materials Science and Engineering |
Degree Granting Institution: | University of Illinois at Urbana-Champaign |
Degree: | Ph.D. |
Genre: | Dissertation |
Subject(s): | Engineering, Materials Science |
Abstract: | In Bi-containing solder interfacial system, we found that Bi segregated to the Cu-intermetallic interface during aging in SnBi/Cu interconnect. This caused serious embrittlement of Sn-Bi/Cu interface. Further aging induced numerous voids along the Cu3Sn/Cu interface. These interfacial voids were different from Kirkendall voids. Their formation was explained on basis of vacancy condensation at the interface as the Bi segregants reduced the number of effective Cu vacancy sink sites and enhanced void nucleation at the interface. The Bi segregation was avoided by replacing the Cu metallization with Ni. It was found that Bi developed a concentration gradient in the Ni 3Sn4 during interfacial reaction, with the Bi concentration falling off to zero as the Ni/IMC interface was approached. Therefore, the inhibition of Bi segregation by Ni was due to the inability of Bi to reach Ni/IMC interface. |
Issue Date: | 2004 |
Type: | Text |
Language: | English |
Description: | 151 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004. |
URI: | http://hdl.handle.net/2142/82753 |
Other Identifier(s): | (MiAaPQ)AAI3153366 |
Date Available in IDEALS: | 2015-09-25 |
Date Deposited: | 2004 |
This item appears in the following Collection(s)
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Dissertations and Theses - Materials Science and Engineering
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Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois