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Recent advances in flip-chip underfill: materials, process, and reliability

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2 Author(s)
Zhuqing Zhang ; Eng. & Packaging Res. Center, Georgia Inst. of Technol., Atlanta, GA, USA ; Wong, C.P.

In order to enhance the reliability of a flip-chip on organic board package, underfill is usually used to redistribute the thermomechanical stress created by the coefficient of thermal expansion (CTE) mismatch between the silicon chip and organic substrate. However, the conventional underfill relies on the capillary flow of the underfill resin and has many disadvantages. In order to overcome these disadvantages, many variations have been invented to improve the flip-chip underfill process. This paper reviews the recent advances in the material design, process development, and reliability issues of flip-chip underfill, especially in no-flow underfill, molded underfill, and wafer-level underfill. The relationship between the materials, process, and reliability in these packages is discussed.

Published in:

Advanced Packaging, IEEE Transactions on  (Volume:27 ,  Issue: 3 )

Date of Publication:

Aug. 2004

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