Patent ID: 6027950
Filing Date: 2000-02-22
Classification: H01L

Abstract:
A method for accurately generating an SOG/TEOS etch rate ratio comprising the steps of:placing an SOG coated semiconductor wafer into an etching environment containing hydrogen therein;etching said SOG coated semiconductor wafer in said hydrogen containing etching environment under various etching parameters;recording first etch rates of said SOG coated semiconductor wafer achieved at said various etching parameters;placing a TEOS coated semiconductor wafer into said etching environment containing hydrogen therein;etching said TEOS coated semiconductor wafer in said hydrogen containing etching environment under said various etching parameters;recording second etch rates of said TEOS coated semiconductor wafer achieved at said various etching parameters;comparing said first and second etch rates; anddetermining under which of said various etching parameters a desired ratio of said first etch rate to said second etch rate is achieved.