Patent ID: 6441455
Filing Date: 2002-08-27
Classification: H01L

Abstract:
A termination structure for a semiconductor die; said semiconductor die having a body of silicon of one of the conductivity types and an upper Nâˆ’ epitaxial layer for receiving diffusions therein; said Nâˆ’ epitaxial layer having an active area diffused therein; a first electrode means connected to said active area; said active area having an outer periphery; said Nâˆ’ epitaxial area and said die having an outer peripheral street; said first electrode and said street being connectable to potential differences in excess of about 600 volts; said termination structure comprising a plurality of spaced concentric P type diffusion rings in said Nâˆ’ epitaxial layer surrounding said outer periphery of said active area to distribute the electric field between said first electrode and said street; said P type diffusion rings having a concentration produced by an implant dose of from about 2E12 to 2E13 atoms/cm2 to reduce the electric field at the surface of said N epitaxial layer and to prevent their complete depletion at full reverse voltage.