Patent ID: 6395563
Filing Date: 2002-05-28
Classification: G01B,G03F,H01L,Y10S

Abstract:
A method of manufacturing a semiconductor device, including formation of a film on a semiconductor region of a wafer or removal of a film from a surface of the semiconductor region of the wafer, the method comprising the steps of:(a) irradiating the semiconductor region of the wafer with measuring light; (b) intermittently irradiating the semiconductor region of the wafer with exciting light; and (c) calculating a change rate of reflectance by dividing the difference between the reflectances of the measuring light when the semiconductor region of the wafer is irradiated and not irradiated with the exciting light by the reflectance of the measuring light when the semiconductor region is not irradiated with the exciting light, wherein the thickness of the film is determined based on the change rate of reflectance.