Patent ID: 6559489
Filing Date: 2003-05-06
Classification: H01L

Abstract:
A semiconductor device, comprising:a semiconductor substrate having a conductive region; an interlayer insulating film having a hole reaching the conductive region on said semiconductor substrate; a conductive layer extending on said interlayer insulating film and filling said hole such that electrical connection with said conductive region is established; a gate electrode formed on said semiconductor substrate with a gate insulating film interposed therebetween; a protective film covering said gate electrode and having an etching rate that is smaller than an etching rate of said interlayer insulating film when using a prescribed etchant; and an isolating oxide film provided on the surface of the semiconductor substrate, the conductive region being positioned between the isolating oxide film and the gate electrode; wherein: said hole is defined by one sidewall and the other sidewall lower than said one sidewall of said interlayer insulating film; one sidewall is positioned on either the isolating oxide film or the gate electrode, and the other sidewall is positioned on the other; and the thickness of the conductive layer on the other sidewall is greater than the thickness of the conductive layer on one sidewall.