Patent ID: 6060751
Filing Date: 2000-05-09
Classification: H01L

Abstract:
A semiconductor device comprising:a composite substrate comprising a semiconductor substrate, and a semiconductor layer on said semiconductor substrate with a dielectric layer interposed therebetween;a plurality of element regions provided in said semiconductor layer and each having a field-effect transistor having a source and a drain of a first conduction type;an element isolating insulation film made by substitution in part of said semiconductor layer surrounding said element regions;first impurity-diffused regions of a second conduction type formed in outer marginal portions of said element regions in said semiconductor layer, said outer marginal portions being adjacent to said element isolating insulation film; anda second impurity-diffused region of the second conduction type formed along a selective surface portion of said semiconductor substrate that extends under said element isolating insulation film lying between said element regions and under said marginal portions of said element regions adjacent to said element isolating insulation film.