Patent ID: 6569750
Filing Date: 2003-05-27
Classification: H01L

Abstract:
A method for forming a device isolation film for a semiconductor device, comprising:sequentially forming a pad oxide film and a pad nitride film on a semiconductor substrate; forming a pad oxide film pattern and a pad nitride film pattern, by patterning the pad oxide film and the pad nitride film using a device isolation mask; forming an impurity implantation region by ion-implanting an impurity into the semiconductor substrate using the pad nitride film pattern as a mask; performing a thermal treatment to diffuse the impurity into the semiconductor substrate; forming a trench by etching the semiconductor substrate using the pad nitride film pattern as a mask, a remaining portion of the impurity implantation region being provided at sidewalls of the trench; forming a device isolation film filling the trench, and removing the pad nitride film pattern and the pad oxide film pattern; and forming a gate electrode on the device isolation film and active region, the impurity implantation region being provided at the lower portion of the gate electrode.