Patent ID: 7893498
Filing Date: 2011-02-22
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor base comprising a plurality of first semiconductor regions having a first conductivity type, a plurality of second semiconductor regions having a second conductivity type formed in a specific surface portion of said first semiconductor regions, and a plurality of third semiconductor regions having the first conductivity type formed in a specific surface portion of said second semiconductor regions; and a first electrode formed directly above said second semiconductor region that is between said first semiconductor region and said third semiconductor regions, wherein a first region comprising a first plurality of third semiconductor regions wherein each of the third semiconductor regions is exhibiting a first top surface area is formed at a center of said semiconductor base, wherein a second region comprising a second plurality of third semiconductor regions wherein each of the third semiconductor regions exhibits a second top surface area larger than said first top surface area completely surrounds said first region, wherein a first device is mounted on the semiconductor base of the semiconductor device.