Patent ID: 7273771
Filing Date: 2007-09-25
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device having a plurality of components common to a plurality of distinct device types, said method comprising the steps of: supplying a wafer having a high concentration of impurities of a first conductivity type and having an epitaxially deposited layer of a lower concentration of said first conductivity type; implanting and diffusing an implant of an impurity of a second conductivity type into the top of said epitaxially deposited layer; forming a plurality of spaced trenches into the top of said wafer and through the depth of said impurity of said second conductivity type; growing a first layer of insulation on the walls and bottom of said trenches; growing a conductive polysilicon mass to fill said trenches; depositing an interlayer oxide atop said polysilicon mass; depositing a conductive silicide atop mesas formed between said trenches; and depositing conductive top and bottom metal electrodes on top and bottom surfaces of said wafer, wherein said implant defines the type of the semiconductor device, the type being selected from all of three distinct device types including a Schottky diode, an Accufet device, and a vertical conduction trench-type MOSFET by selection of the second conductivity type, an implant dose and a diffusion drive.