Patent ID: 6072199
Filing Date: 2000-06-06
Classification: H01L

Abstract:
A semiconductor element, comprising:a substrate of first conductivity type having an impurity concentration of not less than 4.0.times.10.sup.13 /cm.sup.3, said substrate being produced from a single silicon crystal prepared by a zone melting method and substantially free of lifetime killers;a first diffused region of second conductivity type in a first surface of the substrate;a second diffused region of first conductivity type in the first region such that a channel region is formed between the second region and the substrate through the first region;an insulating film on the first surface of the substrate over the channel region;a gate electrode on the insulating film;a source electrode on the first surface of the substrate in contact with the first and second regions;a third diffused region of second conductivity type formed in an opposite second surface of the substrate and having a depth of at least 2 microns; anda drain electrode in contact with said third region.