Patent ID: 6313030
Filing Date: 2001-11-06
Classification: H01L

Abstract:
A method of filling a through hole in an insulation layer in a semiconductor device comprising the steps of:forming a hole in the insulation layer so that said hole has an upper portion which has a larger diameter than other portions thereof;depositing a base layer which extends on at least a part of said upper portion of said hole as well as extends over at least a part of a top surface of said insulation layer in the vicinity of said hole, so that said base layer extending on said upper portion of said hole has an effective thickness in an elevational direction, which is thicker than a thickness of said base layer over said insulation film;depositing a metal layer on said base layer; andsubjecting said metal layer on said base layer to an anisotropic etching to selectively etch said metal layer and said base layer so that at least a part of said base layer on said upper portion of said hole remains, while said metal layer said base layer over said insulation layer are etched.