Patent ID: 7323404
Filing Date: 2008-01-29
Classification: H01L

Abstract:
1. A method of manufacturing a field effect transistor(FET), the method comprising: forming a first trench structure in an active region of a semiconductor substrate; forming a second trench structure to laterally define the active region; forming a shallow trench insulator within the first trench structure and the second trench structure; removing the shallow trench insulator from the first trench structure and a portion of the shallow trench insulator from the second trench structure to expose the first trench structure; forming a gate insulation layer on a portion of the active region such that downward outer edges of the gate insulation layer make contact with a portion of the shallow trench insulator remaining within the second trench structure and the gate insulation layer is not formed on edge portions of the active region; forming a gate electrode structure on the gate insulation layer; and ion implanting an impurity of first conductivity type in source and drain regions of the active region using the gate electrode structure as an ion implantation mask to thereby form a first impurity region.