Patent ID: 8349693
Filing Date: 2013-01-08
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: preparing a silicon substrate that has a first conductivity type, that has a (110)-oriented surface, and that provides a drain region; forming a first epitaxial layer on the (110)-oriented surface of the silicon substrate, wherein the first epitaxial layer has the first conductivity type and is made of silicon; forming a plurality of trenches in the first epitaxial layer in such a manner that the plurality of trenches are arranged in a plane of the silicon substrate, each of the trenches has an approximately rectangular parallelepiped shape, and each of the trenches has (111)-oriented sidewalls, wherein a remaining first epitaxial layer provides a plurality of first columns that is separated from each other through the plurality of trenches; forming a second epitaxial layer so as to fill the plurality of trenches, wherein the second epitaxial layer is made of silicon and has a second conductivity type, and second epitaxial layer provides a plurality of second columns that respectively contacts the plurality of first columns at a (111)-oriented surface; forming a channel-forming layer on the plurality of first columns and the plurality of second columns, wherein the channel-forming layer has the second conductivity type and is made of a silicon layer; forming a plurality of source regions that has a first conductivity type at a surface portion of the channel-forming layer; and forming a plurality of gate electrodes that has an approximately rectangular parallelepiped shape in such a manner that the plurality of gate electrodes penetrate through the channel-forming layer to be adjacent to the plurality of source regions, respectively, and side surfaces of the plurality of gate electrodes cross contact surfaces of the plurality of first columns and the plurality of second columns in the plane of the silicon substrate, wherein the second epitaxial layer is formed by a low-pressure chemical vapor deposition and by using a silicon source gas and a halide gas simultaneously.