Patent ID: 6452232
Filing Date: 2002-09-17
Classification: H01L

Abstract:
A semiconductor device with a SOI structure comprising:a SOI substrate having a buried insulating film and a first conductivity type surface semiconductor layer on the buried insulating film; second conductivity type source and drain regions formed in the surface semiconductor layer; a gate electrode formed over a first conductivity type channel region between the source and drain regions via a gate insulating film; impurity diffusion regions of the first conductivity type in the surface semiconductor layer below the source and drain regions; wherein the source and drain regions are thinner than the surface semiconductor layer, and the channel region in the surface semiconductor layer has a first conductivity type high-concentration impurity diffusion region whose first conductivity type impurity concentration is higher than that in a surface of the channel region and higher than that of the impurity diffusion regions, and wherein the high-concentration impurity diffusion region is adjacent to the buried insulating film.