Patent ID: 9607929
Date: 2017-03-28
CPC Classifications: H01L

Claim:
1. A structure comprising: a substrate having a front side and a back side; semiconductor devices on said front side of said substrate; a through-substrate via extending through said substrate from said front side of said substrate to said back side of said substrate; and a backfill region adjacent to said through-substrate via and extending from said back side of said substrate to a depth within said substrate such that a portion of said substrate is between said backfill region and said through-substrate via, said depth of said backfill region being no more than approximately 50% of a thickness of said substrate, said portion of said substrate being in direct contact with and laterally surrounding a vertical sidewall of said through-substrate via, said backfill region comprising an alternate material having a lower modulus of elasticity than said substrate, said alternate material extending laterally between adjacent ones of said portion that laterally surround adjacent through-substrate vias, said alternate material being at least as thermally conductive as said substrate, and an exposed surface of said alternate material is essentially co-planar with said back side of said substrate.