Patent ID: 6528390
Filing Date: 2003-03-04
Classification: H01L

Abstract:
A method for fabricating a semiconductor device, comprising the steps of:a) forming an ONO layer, a hard mask layer, and a photoresist pattern on a semiconductor substrate in this order; b) patterning said hard mask layer and said ONO layer through etching so as to expose a surface of said semiconductor substrate; c) oxidizing the exposed surface of said semiconductor substrate by using said hard mask layer as an anti-oxidation mask, and thereby forming an oxide layer selectively on said exposed surface; d) implanting dopants into said semiconductor substrate through said oxide layer by using said hard mask layer as an anti-implantation mask, and thereby forming a bit-line region in said semiconductor substrate; and e) oxidizing the surface of said semiconductor substrate through said oxide layer by using said hard-mask layer as an anti-oxidation mask.