Patent ID: 6457479
Filing Date: 2002-10-01
Classification: B08B,H01L,Y10S

Abstract:
A method of removing platinum chloride etching residue from a surface of a silicon wafer comprising the sequential steps of:a) providing a silicon wafer having a surface comprising photoresist and platinum chloride residue deposited thereon; b) dipping the silicon wafer in a first polar organic solvent selected from the group consisting of tetrahydrofuran and ether; then c) stripping said photoresist from the silicon wafer in an oxygen atmosphere under vacuum at a temperature of about 200Â° C.; then d) dipping the silicon wafer in a second polar organic solvent to remove any photoresist residue remaining on the surface of the silicon wafer; then e) applying ultrasound to the silicon wafer for between about 5 minutes to 20 minutes; and then f) drying the silicon wafer in a nitrogen atmosphere, wherein steps d) and e) remove said platinum chloride residue from said surface of said silicon wafer.