Patent ID: 9660046
Date: 2017-05-23
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device, the method comprising: forming a first trench in a semiconductor layer, wherein the semiconductor layer has a surface including a first area and a second area, and the first trench is formed in the first area; growing a crystal of a base layer of a first conductivity type on the surface of the semiconductor layer after forming the first trench; growing a crystal of a source layer of a second conductivity type on a surface of the base layer such that a reflected trench in which a configuration of the first trend is reflected is formed on the first area; forming a mask layer on a surface of the source layer; selectively leaving the mask layer existing in the reflected trench on the first area of the surface of the semiconductor layer by etching a predetermined thickness from a surface of the mask layer; forming a second trench which penetrates at least a part of the source and base layers existing on the second area of the surface of the semiconductor layer such that the semiconductor layer is exposed in the second trench; and forming an insulated trench gate in the second trench, wherein materials of the semiconductor layer, the base layer and the source layer are a wide gap semiconductor, and in the formation of the second trench, the second trench is formed by using the mask layer as a mask.