Patent ID: 6930010
Filing Date: 2005-08-16
Classification: H01L

Abstract:
1. A method of forming a conductive structure in a semiconductor material of a wafer, the semiconductor material having a top surface and a first conductive region that lies below the top surface of the semiconductor material, the first conductive region and the semiconductor material having opposite conductivity types, the method comprising the steps of: forming a trench in the semiconductor material, the trench having a plurality of sidewalls and a bottom surface, the bottom surface of the trench being formed at different depths so that the trench has a shallow end and a deep end; introducing dopant atoms into the bottom surface of the trench; forming a well in the semiconductor material adjacent to the shallow end of the trench; and forming a second conductive region in the semiconductor material, the second conductive region being spaced apart from the first conductive region.