Patent ID: 6794305
Filing Date: 2004-09-21
Classification: H01L

Abstract:
A method of manufacturing a semiconductor integrated circuit device, comprising the steps of:(a) providing a silicon wafer covered with an insulating film whose main surface is mainly formed of silicon oxide; (b) cleaning a surface of said silicon wafer covered with the insulating film whose main surface is mainly formed of silicon oxide, by a sheet-by-sheet manner at an ordinary temperature, with use of a processing solution which contains hydrogen peroxide, hydracid fluoride salt, and water, and also contains HF and HF2âˆ’ as the etching seeds of the silicon oxide, under conditions that said insulating film is etched but said silicon wafer is not etched, the concentration of said hydracid fluoride salt being in the range of about 0.1 to 3 mol/l; (c) removing said insulating film after said step (b), by applying a processing solution which contains hydracid fluoride and water, thereby to expose the surface of said silicon wafer; (d) drying said silicon wafer after said step (c); and (e) subjecting said silicon wafer to a heat treatment after said step (d), thereby to form a gate oxide film over said silicon wafer.