Patent ID: 6307174
Filing Date: 2001-10-23
Classification: B23K

Abstract:
A method for reducing the amount of nitrogen generated during a high-density plasma etching performed on an underlayer of a photo-resist layer added with amine compounds simultaneously with reducing a thickness of a barrier layer formed on the photo-resist layer with a process of the high-density plasma etching, the method comprising the steps of:adjusting etching parameters comprising:an operation pressure of about 3 mTorr to 100 mTorr;a CO flow rate of about 10 sccm to 50 sccm;a flow rate of C.sub.4 F.sub.8 of about 10 sccm to 20 sccm;a total source power of about 500 W to 2000 W; anda process temperature during high-density plasma etching of about -15.degree. C. to 10.degree. C.