Patent ID: 6486524
Filing Date: 2002-11-26
Classification: H01L

Abstract:
A high voltage device; said high voltage device comprisingan N type monocrystalline silicon die having top and bottom surfaces; said top surface having an active surface containing a plurality of PN junctions and a termination region comprising at least first and second concentric P type guard ring diffusions and a first and second ring of silicon dioxide; said first silicon dioxide ring spanning between said at least first and second guard ring diffusions; said second silicon dioxide ring spanning between said second guard ring diffusion and the outer periphery of said active surface; a single contact layer overlying the top surface of said device and separated into an active contact portion overlying said active surface and overlying atop said second silicon dioxide ring defining a first field plate; a second field plate in contact with said second guard ring diffusion and overlapping atop said first silicon dioxide ring; a separate contact layer atop said first guard ring diffusion; said single contact layer consisting of a material having a lower barrier height than aluminum; and an aluminum layer atop said single contact layer.