Patent ID: 7485587
Filing Date: 2009-02-03
Classification: H01L

Abstract:
1. A process for making a semiconductor device comprising the steps of: providing a substrate having at least one semiconductor layer; forming an underlayer having an opening over the at least one semiconductor layer; forming a layer of conductive material over the underlayer and in said opening, said layer of conductive material having a topography that includes a substantially vertical component in said opening; forming an overlayer over the said layer of conductive material said overlayer having a thickness greater than said underlayer; etching a contact hole in said overlayer and in an overetch amount into but not through the substantially vertical component of said layer of conductive material in said opening; forming a contact in said contact hole disposed adjacent to and directly contacting said vertical component; and further comprising the step of forming a structure having an opening therein under said conductive layer and filling said opening with said conductive material to form said vertical component.