Patent ID: 6709986
Filing Date: 2004-03-23
Classification: H01L

Abstract:
A method for manufacturing a semiconductor memory device, comprising the steps of:a) forming a mask layer on a target layer to be etched; b) coating a photoresist including at least one of COMA (CycloOlefin-Maleic Anhydride) and Acrylate on the mask layer; c) exposing the photoresist by using a light resource whose wavelength is of about 157 nm to 193 nm; d) forming a photoresist pattern by developing the photoresist; e) forming a mask pattern by selectively etching the mask layer with a chlorine-based etching gas by using the photoresist pattern as an etching mask; and f) selectively etching the target layer by using the mask pattern as an etching mask.