Patent ID: 6825535
Filing Date: 2004-11-30
Classification: H01L

Abstract:
A field effect transistor comprising:a silicon layer formed on an insulator; a diffused layer formed by diffusing dopant from a part of a surface of the silicon layer up to the insulator; a silicide layer composed of CoSi2 and formed toward the insulator side from a surface of the diffused layer so as to have a thickness that is less than or equal to that of the diffused layer; a contact conductive layer formed on the surface of the silicide layer; a gate insulating layer formed on the silicon layer; a gate electrode formed on the gate insulating layer; and a sidewall formed on a side surface of the gate electrode; wherein the shortest distance X between surfaces opposed to each other, of the contact conductive layer and the sidewall satisfies a relation represented by the following expression (1): R(slc)Ã—106Ã—(1+Tslc/Tsoi)&lE;X&lE;1â€ƒâ€ƒExpression (1) where X indicates the shortest distance (&mgr;m) between the mutually-opposed surfaces of the contact conductive layer and the sidewall, R(slc) indicates a contact resistance (&OHgr;/cm2) of a boundary surface between the silicide layer and the diffused layer, Tslc indicates the thickness (&mgr;m) of the silicide layer, Tsoi indicates the thickness (&mgr;m) of the silicon layer.