Patent ID: 6100139
Filing Date: 2000-08-08
Classification: H01L

Abstract:
A method for producing a semiconductor device which acts as a capacitor comprising:producing a plug-shaped conductive semiconductor layer on a conductive semiconductor substrate, said plug-shaped conductive semiconductor layer being surrounded by an insulator layer,producing a semiconductor oxide layer on said insulator layer, said semiconductor oxide layer having an opening at a location corresponding to said plug-shaped conductive semiconductor layer,producing a conductive semiconductor layer and a conductive semiconductor layer having a rugged surface on said plug-shaped conductive semiconductor layer and said semiconductor oxide layer,producing an etching mask layer on said conductive semiconductor layer having a rugged surface,etching back said etching mask layer until a top surface of said conductive semiconductor layer having a rugged surface is exposed, to convert said etching mask layer to an etching mask,causing said conductive semiconductor layer having a rugged surface to contact an etchant reactive with a semiconductor oxide, to remove semiconductor oxide particles deposited in space remained between the top surface of said conductive semiconductor layer and grains of said conductive semiconductor layer having a rugged surface,etching said conductive semiconductor layer having a rugged surface, said conductive semiconductor layer and said semiconductor oxide layer, employing said etching mask, to produce a first electrode having a shape of vertical cylinder having an open top end and a closed bottom end,producing a dielectric layer to cover at least said first electrode having a shape of a vertical cylinder having an open top end and a closed bottom end, andproducing a second electrode of a conductive material, said second electrode covering said dielectric layer.