Patent ID: 8436397
Filing Date: 2013-05-07
Classification: H01L

Abstract:
1. A semiconductor device comprising: (a) a semiconductor substrate of a first conductive type to be a drain layer; (b) an epitaxial layer of a first conductive type formed on the semiconductor substrate; (c) a plurality of trenches each formed so as to reach an inside of the epitaxial layer from a surface of the epitaxial layer; (d) a source layer of a first conductive type formed on a surface region of the epitaxial layer interposed between trenches adjacent to each other; (e) a gate layer of a second conductive type formed in the epitaxial layer so as to contact with side walls and a bottom portion of each of the plurality of trenches; (f) a channel-formed region of a first conductive type formed in the epitaxial layer between portions of the gate layer adjacent to each other; (g) a drain electrode formed on a rear surface of the semiconductor substrate; (h) a source electrode formed so as to connect to the source layer; and (i) a gate electrode formed so as to connect to the gate layer, wherein in a horizontal direction, an impurity concentration of a first conductive type impurity doped in a junction region forming a p-n junction with the gate layer in the channel-formed region formed between the portions of the gate layer adjacent to each other is higher than an impurity concentration of a first conductive type impurity doped in a center region in the channel-formed region.