Patent ID: 8203151
Filing Date: 2012-06-19
Classification: C30B,H01L

Abstract:
1. A semiconductor device comprising: a semiconductor film made of silicon carbide, said semiconductor film having, at a surface thereof, a first macrostep, a second macrostep, and a third macrostep, each plurality of an equal length and adjacent to each other, three or more trenches positioned at equal intervals at the surface of the semiconductor film, a first channel formed at said first macrostep, a first impurity region and a second impurity region formed on respective sides of said first channel, a second channel formed at said third macrostep, and a third impurity region and a fourth impurity region formed on respective sides of said second channel, wherein taking a length of one cycle of said trenches as L and a depth of said trenches as h, a relation L=h(cot α+cot β) (where α and β are variables that satisfy relations 0°≦α+β≦90° and 0.5°≦α<β) holds between the length L of one cycle and the depth h.