Patent ID: 6284606
Filing Date: 2001-09-04
Classification: H01L

Abstract:
A method of forming a groove in a semiconductor substrate, comprising the steps of:forming an insulator mask on said semiconductor substrate, with an opening in said insulator mask, exposing a portion of said semiconductor substrate; andperforming a selective, anisotropic dry etching procedure to form said groove, in said semiconductor substrate, via removal of a region of said semiconductor substrate, exposed in said opening in said insulator mask, with the desired depth of said groove determined when said insulator mask is totally removed from the surface of said semiconductor substrate, during said selective, anisotropic dry etching procedure, and with said selective, anisotropic dry etching procedure being a RIE procedure, using an etchant chosen from a group that includes Cl.sub.2 /HBr/He--O.sub.2, with an etch ratio of silicon to silicon oxide, between about 40 to 1, to 1.