Patent ID: 6468922
Filing Date: 2002-10-22
Classification: H01L

Abstract:
A method of forming a semiconductor device comprising:providing a semiconductor substrate having an active region; covering the active region of the semiconductor substrate with an oxide film; covering the oxide film with a first borophosphosilicate glass film; and forming a second borophosphosilicate glass film directly on the first borophosphosilicate glass film so as to be in contact with the first borophosphosilicate glass film, the second borophosphosilicate glass film having a concentration of boron oxide which is higher than a concentration of boron oxide in the first borophosphosilicate glass film, and the second borophosphosilicate glass film having a concentration of phosphorus which is substantially the same as a concentration of phosphorus in the first borophosphosilicate glass film, to prevent out diffusion of dopants from the second borophosphosilicate glass film to the semiconductor substrate via the oxide film.