Patent ID: 6709939
Filing Date: 2004-03-23
Classification: H01L

Abstract:
A method for fabricating a semiconductor device comprising:forming a field oxide layer defining an active region on a semiconductor substrate, the active region including a core device region and an input/output device region; forming at least one gate oxide layer on the input/output device region; forming gate electrodes on the at least one gate oxide layer; forming a first LDD region by ion-implanting low concentration impurity ions to the core device and input/output device regions or the active region; forming a photoresist film pattern which is an LDD ion-implant mask or the input/output region; forming a second LDD region deeper than the first LDD region by implanting low concentration impurity ions by using the photoresist film pattern as an ion implant mask; removing the photoresist film pattern; forming an insulating film spacer on side walls of the gate electrodes; forming a deep source/drain region and a shallow source/drain region by implanting high concentration impurity ions to the active region of the semiconductor substrate at least once, by using the insulating film spacer as an ion implant mask; and forming a silicide film on the gate electrodes and the deep and shallow source/drain regions.