Patent ID: 7109068
Filing Date: 2006-09-19
Classification: H01L

Abstract:
1. A method for forming a conductive via through a substrate comprising: providing a substrate having an upper surface and a lower surface and having a layer of etch mask material on one of the upper surface and the lower surface; forming an aperture passing through the substrate between the upper and lower surfaces; contacting the aperture with an etchant to enlarge the aperture, the enlarged aperture tapering from a larger size in an interior of the substrate to a lesser size at one of the upper surface and the lower surface of the substrate; applying a passivating material to an interior surface of the enlarged aperture; forming a conductive member having upper and lower ends within the passivated, enlarged aperture; and thinning the substrate from at least one of the upper and lower surfaces to expose at least one end portion of the conductive member.