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Thermal Control of Interfaces for Microelectronic Packaging

Published online by Cambridge University Press:  10 February 2011

E. E. Marotta
Affiliation:
M.E. Department, Clemson University, Clemson, S.C. 29672, emarott@ces.clemson.edu
B. Hana
Affiliation:
M.E. Department, Clemson University, Clemson, S.C. 29672, emarott@ces.clemson.edu
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Abstract

The continuous miniaturization of electronic devices places an ever-increasing importance on the thermal management of electronic systems and its subcomponents. The increased power densities and heat generation, due to the miniaturization of the device line features, may lead to higher operating temperatures and greater warpage between the silicon device and its organic carrier. The higher operating temperature may result from the degradation of the overall thermal performance. These additive effects will also lead to an increasing number of thermally induced failures, which will be further magnified when future microelectronic packaging incorporates flip-chip technology.

The higher operating temperatures within microelectronic systems result from inadequate dissipation of the heat generated, while the warpage effect is caused by the mismatch between the thermal coefficients of expansion (ICE) induced by thermal stresses. Often these high temperatures result from the thermal resistance between subcomponents, such as between the contacting surfaces of laminated printed circuit boards, device/epoxy cement and heat spreader (i.e., finned heat sink or heat pipe), and any other metallic or non-metallic interstitial material employed between contacting interfaces.

Published experimental data of potential coatings, adhesives, and elastomeric gaskets is presented that can improve the thermal contact conductance of contacting surfaces within microelectronic systems. In addition, recommendations for future analytical and experimental studies of the mnechanistic principles, which control thermal performance of interstitial materials, are discussed for non-uniform pressure distribution.

Type
Research Article
Copyright
Copyright © Materials Research Society 1998

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