Patent ID: 6123862
Filing Date: 2000-09-26
Classification: H01L

Abstract:
A plasma etch process, comprising:providing a semiconductor substrate having a layer of an oxide of silicon thereon;applying a mask over the layer of an oxide of silicon so as to leave at least one aperture in said mask through which a surface of said layer of an oxide of silicon is exposed;disposing said semiconductor substrate in a plasma etch chamber having a roof, a ring, and a chuck;maintaining said roof at a temperature of between about 115.degree. C. and 150.degree. C.;maintaining said ring at a temperature of between about 200.degree. C. and 250.degree. C.;maintaining said chuck at a temperature of between about -10.degree. C. and 30.degree. C.;maintaining a pressure in said plasma etch chamber of about 5 mTorr or greater;maintaining a source power in said plasma etch chamber at between about 750 watts and 2000 watts;maintaining a bias power in said plasma etch chamber at between about 600 watts and 1000 watts;introducing CHF.sub.3 into said plasma etch chamber at a flow rate of between about 10 sccm and 40 sccm;introducing CH.sub.2 F.sub.2 into said plasma etch chamber at a flow rate of between about 10 sccm and 40 sccm;generating a substantially CO free gas plasma comprising CHF.sub.3 and CH.sub.2 F.sub.2 into an area proximate the at least one aperture.