Patent ID: 8350317
Filing Date: 2013-01-08
Classification: H01L,H02M,Y02B

Abstract:
1. A semiconductor device comprising: a drift region of first conductivity type; a well region extending above the drift region and having a second conductivity type opposite the first conductivity type; an active trench extending into the drift region deeper than the well region, the active trench comprising: source regions having the first conductivity type and formed in the well region adjacent the active trench; a body trench formed adjacent the well region and at least one of the source regions, the body trench being substantially filled with a second conductive material; and a second layer having the second conductivity type, the second layer substantially surrounding the body trench and extending deeper than the well region into the drift region, the second layer having a concentration of the second conductivity type that is greater than a concentration of the second conductivity type of the well region; wherein the second layer influences an electric field near the active trench.