Patent ID: 8633539

Claim:
A semiconductor device, comprising: a semiconductor body including a first surface and a second surface; a trench structure extending into the semiconductor body from the first surface, the trench structure including a first gate electrode part and a first gate dielectric part in a first part of the trench structure, and a second gate electrode part and a second gate dielectric part in a second part of the trench structure, wherein a width of the trench structure in the first part is equal to the width of the trench structure in the second part; a body region adjoining the first and second gate dielectric parts at a side wall of the trench structure; and wherein a distance d1 between a bottom edge of the first gate dielectric part and the first surface and a distance d2 between a bottom edge of the second gate dielectric part and the first surface satisfies 50 nm<d1−d2.