Patent ID: 6831018
Filing Date: 2004-12-14
Classification: G03F,H01L

Abstract:
A method for fabricating a semiconductor device comprising the steps of:forming a resist pattern on an insulating film deposited on a semiconductor substrate and subjecting said insulating film to plasma etching using an etching gas including carbon and fluorine with said resist pattern used as a mask; performing a first stage of ashing on said resist pattern and a polymer film derived from said etching gas and having been deposited on said resist pattern with a relatively low chamber pressure and relatively low plasma generation power by using a first ashing gas composed of an oxygen gas or a gas including oxygen as a principal constituent; and performing a second stage of the ashing on a residual polymer present on said insulating film in completing said first stage of the ashing with relatively high chamber pressure and relatively high plasma generation power by using a second ashing gas composed of an oxygen gas or a gas including oxygen as a principal constituent, wherein said resist pattern is removed during the step of performing said first stage of ashing, said first stage of ashing is performed under a chamber pressure of 6.67 Pa or less, and said second stage of ashing is performed under a chamber pressure of 6.67 Pa or more.