Patent ID: 6534370
Filing Date: 2003-03-18
Classification: H01L

Abstract:
A method for fabricating a semiconductor device having an elevated source/drain scheme, comprising the steps of:forming a first photoresist film on a top surface of a semiconductor substrate; forming a second photoresist film on the first photoresist film; forming a second photoresist film pattern so that a portion corresponding to a field region has a first opening and a region in which a gate electrode is to be formed has a second opening by exposing the second photoresist film to a first light, thereby developing the second photoresist film; forming a first photoresist film pattern so that a portion corresponding to the field region has a third opening having a portion being overlapped by a portion of the first opening by exposing the first photoresist film to a second light, thereby developing the first photoresist film; forming a first trench at the first opening position and a second trench at the second opening position on the semiconductor substrate by etching the semiconductor substrate using the first photoresist film pattern and the second photoresist film pattern as a mask; filling the first trench and the second trench with an oxide film; removing the oxide film in the second trench; forming a gate oxide film on inner walls of the first and second trenches and on the top surface of the semiconductor substrate; forming a gate electrode on a top surface of the second trench by forming a conductive layer on a top surface of the gate oxide film and patterning the conductive layer; and forming a source junction and a drain junction by implanting impurity ions in the semiconductor substrate at both sides of the gate electrode.