Patent ID: 9269807
Filing Date: 2016-02-23
CPC Classification: H01L

Claim Text:
1. A power transistor comprising: a semiconductor body; a source region of a first conductivity type disposed in the semiconductor body; a drain region of the first conductivity type disposed in the semiconductor body and spaced from the source region; a drift region of the first conductivity type disposed in the semiconductor body adjacent the drain region between the source and drain regions; a channel region of a second conductivity type disposed in the semiconductor body adjacent the drift region between the drift region and the source region; a dopant retarding region disposed in the semiconductor body between the drift region and the channel region, the dopant retarding region doped with a material selected from the group consisting of carbon, nitrogen and fluorine, wherein either the drift region is bounded by the dopant retarding region and the channel region is not bounded by the dopant retarding region or the channel region is bounded by the dopant retarding region and the drift region is not bounded by the dopant retarding region; and a gate at least partially overlying the channel region and being insulated therefrom.