Patent ID: 7791123
Filing Date: 2010-09-07
Classification: G11C,H01L

Abstract:
1. A semiconductor structure comprising: a semiconductor layer having a doping of a first conductivity type, located in a semiconductor substrate, and containing a trench, wherein said semiconductor layer contiguously, extends from a top surface of said semiconductor substrate at least to a depth about a bottommost surface of said trench in a vertical direction; a doped semiconductor fill portion having a doping of said first conductivity type, located in said trench, contiguously extending to said top surface of said semiconductor substrate, and directly contacting surfaces of said semiconductor layer at an upper portion of said trench; a buried plate layer having a doping of a second conductivity type, surrounding a lower portion of said trench, and laterally abutting a sidewall of said trench, wherein said second conductivity type is the opposite of said first conductivity type; and a doped well of said second conductivity type abutting said buried plate layer and contiguously extending from said top surface of said semiconductor substrate at least to a topmost surface of said buried plate layer in said vertical direction.