Patent ID: 8482062
Filing Date: 2013-07-09
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a first trench and a second trench extending into a semiconductor body from a surface, wherein the first trench and the second trench extend to a same depth into the semiconductor body; a body region of a first conductivity type adjoining a first sidewall of the first trench and a first sidewall of the second trench, the body region including a channel portion adjoining a source structure and being configured to be controlled in its conductivity by a gate structure, an insulating structure and an electrode structure being formed in the first trench and the gate structure comprising a gate electrode structure and a gate dielectric structure being formed in the second trench, wherein the channel portion is formed at the first sidewall of the second trench and is not formed at the first sidewall of the first trench; an electrically floating semiconductor zone of the first conductivity type adjoining the first trench and having a bottom side located deeper within the semiconductor body than a bottom side of the body region; wherein a first semiconductor zone of a second conductivity type adjoins to a bottom side of the first trench, the first semiconductor zone having a larger dopant density than a second semiconductor zone of the second conductivity type adjoining to a bottom side of the body region, and wherein the first semiconductor zone adjoins to a bottom side of the electrically floating semiconductor zone of the first conductivity type.