Patent ID: 9722073
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A lateral superjunction MOSFET device, comprising: a semiconductor body comprising a lateral superjunction structure including a plurality of alternating N-type and P-type thin semiconductor regions formed substantially in parallel with a major surface of the semiconductor body, the alternating N-type and P-type thin semiconductor regions forming a drain drift region of the MOSFET device; a body region of a first conductivity type formed in a first surface of the semiconductor body; a conductive gate formed on the semiconductor body at a near end of the lateral superjunction structure and insulated from the semiconductor body by a gate dielectric layer; a source region of a second conductivity type, opposite the first conductivity type, formed in the body region and formed self-aligned with a first end of the conductive gate, the source region extending under the first end of the conductive gate to form a small overlap; a body contact region of the first conductivity type formed in the body region and adjacent to the source region; a drain region of the second conductivity type formed at a distant end of the lateral superjunction structure, the drain region extending through the lateral superjunction structure; and a first column of the second conductivity type formed under the conductive gate and spaced apart from the source region, the region of the semiconductor body under the conductive gate between the source region and the first column forming a channel of the MOSFET device, the first column extending through the lateral superjunction structure and is electrically unbiased, wherein the first column distributes a current from the channel of the MOSFET device in an on-state to the drain drift region formed by the lateral superjunction structure to be collected by the drain region.