Patent ID: 6707105
Filing Date: 2004-03-16
Classification: H01L

Abstract:
A semiconductor device comprising:a substrate at least having an insulative surface; a semiconductor film provided on said insulative surface of said substrate comprising a first semiconductor layer of a first conductivity type, a second semiconductor layer of said first conductivity type having an impurity concentration lower than that of said first semiconductor layer, a third semiconductor layer of a second conductivity type opposite to said first conductivity type and a fourth semiconductor layer of said second conductivity type having an impurity concentration lower than that of said third semiconductor layer; and an insulative isolator formed on a surface of said semiconductor film opposite said substrate, separately from said insulative surface of said substrate, wherein said second and fourth semiconductor layers form a pn junction extending across a thickness direction of said semiconductor film and reaching said insulative surface, and a maximum distance taken along said insulative surface of said substrate between any point along said pn junction and an end of said insulative isolator is not more than about 2 &mgr;m, when a direction from said end of said insulative isolator along said insulative surface of said substrate is taken as a positive direction.