Patent ID: 6448179
Filing Date: 2002-09-10
Classification: H01L

Abstract:
A method for fabricating a semiconductor device, comprising the steps of:providing a semiconductor substrate comprising a MOSFET and a device isolation film; forming a conductive material layer on the semiconductor substrate; forming a metallic film on the conductive layer, wherein the metallic film is a metal oxide or a metal nitride film; forming a photoresist film pattern on the metallic film to cover a predetermined region where a bit line contact plug and a storage electrode contact plug is to be formed; etching the metallic film using the photoresist film pattern as an etching mask to form a metallic film pattern, wherein the metallic film pattern has a larger width than that of the photoresist film pattern; forming a polymer comprising a metal on side walls of a stacked structure comprising the metallic film pattern and the photoresist film pattern, the stacked structure and the polymer thereby forming a contact mask; forming a bit line contact plug and a storage electrode contact plug by etching the conductive layer using the contact plug mask; and removing the contact plug mask.