Development of Bi-Directional Module using Wafer-Bonded Chips

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Date

2015-01-06

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Publisher

Virginia Tech

Abstract

Double-sided module exhibits electrical and thermal characteristics that are superior to wire-bonded counterpart. Such structure, however, induces more than twice the thermo-mechanical stress in a single-layer structure. Compressive posts have been developed and integrated into the double-sided module to reduce the stress to a level acceptable by silicon dice. For a 14 mm x 21 mm module carrying 6.6 mm x 6.6 mm die, finite-element simulation suggested an optimal design having four posts located 1 mm from the die; the z-direction stress at the chip was reduced from 17 MPa to 0.6 MPa.

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Keywords

Double-sided die, wafer-bonded chip, hourglass joint, compressive post, module fabrication, module characterization, high density integration, thermal management, thermo-mechanical stress, reliability test

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