標題: | Electromigration in Pb-free solder bumps with Cu column as flip chip joints |
作者: | Nah, Jae-Woong Suh, J. O. Tu, K. N. Yoon, Seung Wook Chong, Chai Tai Kripesh, V. Su, B. R. Chen, Chih 材料科學與工程學系 Department of Materials Science and Engineering |
公開日期: | 2006 |
摘要: | The electromigration in flip chip joints of Cu column bump with two different kinds of solder bumps; eutectic SnPb or eutectic SnAg was studied. The Cu columns were 50 mu m thick and 50 mu m diameter for eutectic SnPb solders and 80 mu m thick and 85 mu m diameter for eutectic SnAg solders. We observed that these flip chip joints did not fail after 1 month at 100 degrees C with a current density of 1 x 10(4) A/cm(2). In these flip chip joints of Cu column bumps with solder bumps, the current distribution in the solder region was uniform and they had strong resistance against electromigration induced failure. The effect of Cu column bump on current distribution in the solder joint has been confirmed by simulation. When we compared the difference in microstructural change between the Cu column with eutectic SnPb and the Cu column with eutectic SnAg, we found that electromigration enhanced the formation of Kirkendall voids at the Cu/Cu3Sn interface in the eutectic SnPb case due to the smaller amount of Sri in the solder bump. Therefore, the flip chip joints of Cu column bumps with eutectic SnPb solder bumps would be weakened at the interface after high current stressing. |
URI: | http://hdl.handle.net/11536/134487 |
ISBN: | 1-4244-0151-8 |
ISSN: | 0569-5503 |
期刊: | 56TH ELECTRONIC COMPONENTS & TECHNOLOGY CONFERENCE 2006, VOL 1 AND 2, PROCEEDINGS |
起始頁: | 657 |
結束頁: | + |
顯示於類別: | 會議論文 |