Patent ID: 8878367
Filing Date: 2014-11-04
Classification: H01L

Abstract:
1. A substrate structure with through vias, comprising: a semiconductor substrate having a back surface and a plurality of through vias exposed from the back surface; a metal layer formed on the semiconductor substrate with the through vias exposed therefrom; a first insulating layer formed on the back surface of the semiconductor substrate and having a plurality of openings connected to the through vias; and a second insulating layer stacked on the first insulating layer and having a portion thereof extending to an opening wall of each of the openings and a via wall of each of the through vias so as for the extending portion of the second insulating layer to form a trench insulating layer, wherein the trench insulating layer is etched back to allow a footing portion to be formed at a corner formed by each of the through vias and the metal layer, and the footing portion has a height less than a total height of the first insulating layer and the second insulating layer that are above the back surface of the semiconductor substrate, and wherein the bottom part of the through vias is wider than the top part of the through vias.