Patent ID: 8232184

Claim:
A method for manufacturing a silicon carbide semiconductor device, the method forming a trench from a surface of a substrate made of a silicon carbide semiconductor, the trench comprising a first straight trench section comprising first straight trenches extending in parallel to each other, the method comprising the step of: connecting end portions of adjacent first straight trenches to each other with second straight trench sections extending at 30 degrees of angle with the first straight trench section and a third straight trench section extending in perpendicular to the first straight trench section such that a polygon is formed; or connecting the end portions of adjacent first straight trenches to each other with fourth straight trench sections extending at 60 degrees of angle with the first straight trench section and the third straight trench sections extending in perpendicular to the first straight trench section such that a polygon is formed; or connecting the end portions of adjacent first straight trenches to each other with the second straight trench sections, the fourth straight trench sections and the third straight trench section such that a polygon is formed.