Patent ID: 7727848
Filing Date: 2010-06-01
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor structure in a substrate, the method comprising: forming a trench in the semiconductor material with first sidewalls disposed between a base of the trench and a top surface of the substrate; partially filling the trench with a conductive material; forming a first doped well of the first conductivity type in the semiconductor material of the substrate; forming a second doped well of the first conductivity type in the semiconductor material of the substrate such that the first doped well is separated from the second doped well by the first sidewalls and the base of the trench; and diffusing a mobile dopant of the first conductivity type from the conductive material laterally outward into the substrate along the first sidewalls of the trench to define a first conductive region in the first doped well and a second conductive region in the second doped well each having a higher dopant concentration of the first conductivity type than the first and second doped wells.