Pb/In solder bump formation for a flip-chip bonding technique at high speed optical communication devices

Haksoo Han, Hyunsoo Chung, Sungkook Park, Yungil Joe, Sungsoo Park, Gwanchong Joo, Nam Hwang, Hee Tae Lee, Kang Seungoo, Song Min-Kyu

Research output: Contribution to conference › Paper

1 Citation (Scopus)

Abstract

The increasing speed of advanced chip technologies has greatly challenged the interconnection methods and processes in order to achieve enhanced capability. We have successfully fabricated the solder bump and it's reflowing process for flip-chip bonding interconnection technique instead of conventional wire bonding for high speed devices. The lead(Pb: 350°C) and the Indium(In: 157°C) were used for solder bump and deposited by using thermal evaporation. The thickness of the deposited metal for solder bump was in the range of 5approx.6μm thickness. Specially, to increase the accuracy and the reliability of the flip-chip bonding Technique, 3 layer thick photoresist about 30μm was used to control the deposition area for solder bump. It was also used for the lift-off process of excess deposited metal for solder bump. The height of solder bump through the reflowing process was controlled in the range of 10approx.40μm according to the deposited area and shape. Also, the deposited area and shape was one of the most important parameters for solder bump fabrication. In addition, it was found that an oxidized surface layer effects on the increased melting temperature of deposited metal for solder bump. In this process, the reflowing temperature of PB/In (60:40 wt%) solder bumps was 230±5°C.

Original languageEnglish
Pages421-424
Number of pages4
Publication statusPublished - 1996
EventProceedings of the 1996 IEEE Asia Pacific Conference on Circuits and Systems - Seoul, South Korea
Duration: 1996 Nov 18 → 1996 Nov 21

Other

OtherProceedings of the 1996 IEEE Asia Pacific Conference on Circuits and Systems
CitySeoul, South Korea
Period96/11/18 → 96/11/21

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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    Han, H., Chung, H., Park, S., Joe, Y., Park, S., Joo, G., Hwang, N., Lee, H. T., Seungoo, K., & Min-Kyu, S. (1996). Pb/In solder bump formation for a flip-chip bonding technique at high speed optical communication devices. 421-424. Paper presented at Proceedings of the 1996 IEEE Asia Pacific Conference on Circuits and Systems, Seoul, South Korea, .