Patent ID: 8791578
Filing Date: 2014-07-29
Classification: H01L

Abstract:
1. A through-silicon via structure for providing an electrical path between a first side and a second side of a silicon chip, the first side having a first-side surface and the second side having a second-side surface, the via structure comprising: a via penetrated through the chip from the first-side surface to the second-side surface, having a first end on the first-side surface and a second end on the second-side surface; a local isolation layer deposited on the via's sidewall and on a portion of the first-side surface surrounding the first end; and a plurality of substantially closely-packed microstructures arranged to form a substantially non-random pattern and fabricated on at least the portion of the first-side surface covered by the local isolation layer for promoting adhesion of the local isolation layer to the chip, wherein a majority of the microstructures has a depth of at least 1 μm.