Patent ID: 9024380
Filing Date: 2015-05-05
Classification: H01L

Abstract:
1. A device comprising: a semiconductor substrate; a body region in the semiconductor substrate and having a first conductivity type, and comprising a channel region through which charge carriers flow during operation; a drain region in the semiconductor substrate, having a second conductivity type, and spaced from the body region along a first lateral dimension of the semiconductor substrate; a drift region in the semiconductor substrate, having the second conductivity type, and electrically coupling the drain region to the channel region; a plurality of floating reduced surface field (RESURF) regions in the semiconductor substrate adjacent the drift region, having the first conductivity type, and around which the charge carriers drift through the drift region under an electric field arising from a voltage applied to the drain region during operation; and a further floating RESURF region in the semiconductor substrate adjacent the drift region, having the first conductivit type, and around which the charge carriers move while drifting through the drift region, wherein the further floating RESURF region connects the plurality of floating RESURF regions to form a non-perforated, notched ring around the drain region; wherein adjacent floating RESURF regions of the plurality of floating RESURF regions are spaced from one another along a second lateral dimension of the device by a respective gap; and wherein the plurality of floating RESURF regions are disposed between the further floating RESURF region and the drain region to form a notched drain-side face.