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1	Development of Bi-Directional Module using Wafer-Bonded Chips Kim, Woochan 06 January 2015 (has links) 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. / Ph. D. Double-sided die wafer-bonded chip hourglass joint compressive post module fabrication module characterization high density integration thermal management thermo-mechanical stress reliability test