Patent ID: 6518130
Filing Date: 2003-02-11
Classification: H01L

Abstract:
A method of producing a semiconductor device comprising a plurality of first transistors formed in a first region of a semiconductor substrate and a plurality of second transistors formed in a second region of the semiconductor substrate,said method comprising the steps of: (A) forming a gate insulating layer on the surface of the semiconductor substrate and then forming gate electrodes composed of a polysilicon for forming the first transistors and the second transistors, and then, forming source/drain regions constituting the second transistors in the semiconductor substrate, (B) filling a space between the gate electrodes constituting the adjacent second transistors with an insulating material layer, and exposing a region of the semiconductor substrate in which region source/drain regions constituting the first transistors are to be formed, the top surface of the gate electrodes constituting the first transistors and the top surface of the gate electrodes constituting of the second transistors, (C) forming source/drain regions in the region of the semiconductor substrate in which region the source/drain regions constituting the first transistors are to be formed, and (D) forming a silicide layer in the source/drain regions constituting the first transistors, on the top surface of the gate electrodes constituting the first transistors and on the top surface of the gate electrodes constituting the second transistors, to obtain the gate electrodes formed of the polysilicon and the silicide layer formed thereon; wherein forming the insulating material layer in step (B) includes forming a first insulating material layer on the first transistor, forming a second insulating material layer on the first insulating material layer, forming a third insulating material layer on the second insulating material layer, selectively removing the third insulating material layer and the first insulating material layer from the first transistors to form a gate sidewall from the third insulating material layer and the first insulating material layer.