Patent ID: 7186649
Filing Date: 2007-03-06
Classification: H01L,Y10S

Abstract:
1. A method of fabricating a submicron semiconductor device comprising: forming a thermal oxide layer on a substrate; forming a polysilicon layer on said thermal oxide layer; forming a hard mask on said polysilicon layer, wherein said hard mask is a SiH depositing a photoresist on said hard mask and patterning said photoresist by using a mask; etching said hard mask by plasma etching to form a thin hard mask pattern by using the photoresist pattern as an etching mask so that the hard mask pattern can have a narrower width than that of the photoresist pattern; etching said polysilicon layer by using the hard mask pattern as an etching mask; etching a polymer formed as a residual product resulting from etching said polysilicon layer; and selectively removing said hard mask pattern using an etching process while protecting said polysilicon layer and said thermal oxide layer from etching, wherein said etching process is performed by HF gas on a hot plate, said HF is generated gasifying a solution of about 39% HF, as the same time that said gas protects a polysilicon gate and a gate oxide, said HF gas is formed through spraying N