Patent ID: 7214578
Filing Date: 2007-05-08
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device in which a semiconductor memory element having an ONO (silicon oxide layer/silicon nitride layer/silicon oxide layer) film as a gate insulating film and a CMOS part are formed on a semiconductor substrate, said method comprising: the step of forming an ONO film on the top surface of the semiconductor substrate; the step X of forming bit lines for the semiconductor memory element by introducing first impurities into parts of the semiconductor substrate; the step Y of forming bit line oxide films on the bit lines; the step of implanting second impurities into a region of the semiconductor substrate in which a CMOS part is to be formed; and the step of forming a thermal oxide film on the region of the semiconductor substrate into which the second impurities are implanted, wherein the bit line oxide films are formed simultaneously with the formation of the thermal oxide film.