Patent ID: 8264036
Filing Date: 2012-09-11
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type comprising a first major surface; at least one pair of trenches extending in parallel to each other and formed from the first major surface; a protruding semiconductor region between the pair of trenches, the protruding semiconductor region being narrower than the trenches; a base layer of a second conductivity type in the protruding semiconductor region; a region of the first conductivity type on a surface side of the base layer; a gate insulator film on a first side wall of the protruding semiconductor region; a gate electrode on the gate insulator film; the protruding semiconductor region being from 0.5 μm to 3.0 μm in short side width; the trench being from 0.5 μm to 3.0 μm in depth; the trench being 1.0 μm or longer in short side width; the trench being wider than the protruding semiconductor region in the short side widths thereof; the gate electrode comprising electrically conductive polycrystalline silicon as a main component thereof; and the gate electrode being from 0.2 μm to 1.0 μm in thickness.