Patent ID: 9293347
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a MISFET including wherein a first insulating film is formed on the semiconductor layer so as to cover the first epitaxial layer, wherein the gate electrode is buried in a first trench formed in the first insulating film, wherein the first epitaxial layer has an upper surface positioned higher than an upper surface of the semiconductor layer directly below the gate electrode, wherein an end part of the gate electrode is positioned on the first epitaxial layer in a gate length direction of the MISFET, wherein a source or drain semiconductor region is formed in the first epitaxial layer and the semiconductor layer, wherein the source or drain semiconductor region has a first region and a second region adjacent to the first region and has an impurity concentration higher than an impurity concentration of the first region, and wherein at least part of the first region is positioned directly below the gate electrode.