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Interfacial Morphology and Shear Deformation of Flip Chip Solder Joints

Published online by Cambridge University Press:  31 January 2011

J. W. Jang ,
C. Y. Liu ,
P. G. Kim ,
K. N. Tu ,
A. K. Mal  and
D. R. Frear
J. W. Jang
Affiliation:
Department of Materials Science —Los Angeles, Los Angeles, California 90095-1595
C. Y. Liu
Affiliation:
Department of Materials Science —Los Angeles, Los Angeles, California 90095-1595
P. G. Kim
Affiliation:
Department of Materials Science —Los Angeles, Los Angeles, California 90095-1595
K. N. Tu*
Affiliation:
Department of Materials Science —Los Angeles, Los Angeles, California 90095-1595
A. K. Mal
Affiliation:
Department of Mechanical —Los Angeles, Los Angeles, California 90095-1597
D. R. Frear
Affiliation:
Motorola, Semiconductor Products Sector, Tempe, Arizona 85284
*
a)[email protected]
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Abstract

We examined the interfacial morphology and shear deformation of flip chip solder joints on an organic substrate (chip-on-board). The large differences in the coefficients of thermal expansion between the board and the chip resulted in bending of the 1-cm2 chip with a curvature of 57 ± 12 cm. The corner bump pads on the chip registered a relative misalignment of 10 μm with respect to those on the board, resulting in shear deformation of the solder joints. The mechanical properties of these solder joints were tested on samples made by sandwiching two Si chips with electroless Ni(P) as the under-bump metallization and 25 solder interconnects. Joints were sheared to failure. Fracture was found to occur along the solder/Ni3Sn4 interface. In addition, cracking and peeling damages of the SiO2 dielectric layer were observed in the layer around the solder balls, indicating that damage to the dielectric layer may have occurred prior to the fracture of the solder joints due to a large normal stress. The failure behavior of the solder joints is characterized by an approximate stress analysis.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 8 , August 2000 , pp. 1679 - 1687
Copyright
Copyright © Materials Research Society 2000

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References

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