Patent ID: 6747748
Filing Date: 2004-06-08
Classification: H01L

Abstract:
A manufacturing method for a field-effect transistor comprising steps of:heating a semiconductor substrate which is rotated with a predetermined rotational frequency in a predetermined gas atmosphere to advance a reaction between said gas atmosphere and said semiconductor substrate inwardly from a surface of said semiconductor substrate such that an insulating film formed by said reaction grows from the surface of said semiconductor substrate toward an inside of said semiconductor substrate: irradiating light which is modulated with said predetermined rotational frequency upon the surface of said semiconductor substrate during said heating step and detecting intensity synchronizing with a frequency twice as large as said predetermined rotational frequency of polarization components in two directions perpendicular to each other of light reflected from an interface between said semiconductor substrate and said grown insulating film, to obtain a thickness of said insulating film in a unit of atomic layer based on a change in the detected intensity; detecting an end point of said reaction based on the film thickness obtained in said irradiating step to terminate said heating step; forming a dielectric film, having a dielectric constant higher than said insulating film, on said insulating film; and forming a gate electrode on said dielectric film.