Patent ID: 6657273
Filing Date: 2003-12-02
Classification: H01L

Abstract:
A Schottky diode comprising an N+silicon substrate having an Nâˆ’epitaxially deposited layer on its top surface; said epitaxially deposited layer having at least one field ring diffusion in its top surface, which encloses an active Schottky area; a Schottky forming material in contact with said active area; said guard ring comprising a composite of a first diffusion region extending into said epitaxial layer for a first depth and having a first concentration and a second diffusion region superimposed on said first diffusion and extending into said epitaxial layer for a second depth which is shallower than said first depth and having a second concentration which is greater than said first concentration, said second diffusion forming a PN junction with said epitaxial deposited layer.