Patent ID: 8816429
Filing Date: 2014-08-26
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate heavily doped with a dopant of a first conductivity type; a strained region in an upper portion of the substrate, the strained region containing a strain dopant comprising germanium, wherein the mole fraction of germanium in the strained region ranges from about 0.05 to about 0.5; an epitaxial layer on the strained region, the epitaxial layer being lightly doped with a dopant of a first or second conductivity type; a trench formed in the epitaxial layer, the trench containing a MOSFET structure with a drift region overlapping the strained region; a source layer contacting an upper surface of the epitaxial layer and an upper surface of the MOSFET structure; and a drain contacting a bottom portion of the substrate.