Patent ID: 6479885
Filing Date: 2002-11-12
Classification: H01L

Abstract:
An electrical device usable in high voltage applications, said device being fabricated in accordance with the following steps:providing a substrate layer having upper and lower spaced and generally parallel surfaces, said substrate layer having a predetermined substrate layer conductivity type; forming a second layer contiguous with the upper surface of the substrate layer, said second layer having upper and lower spaced and generally parallel surfaces and a predetermined second layer conductive type thereby forming a pn junction between the substrate layer and said second layer; forming a top layer contiguous with the upper surface of said second layer, said top layer being formed in a predetermined pattern and including a dopant material; heating the substrate layer, second layer, and top layer to form a diffusion region in said second layer, said diffusion region having a pattern based upon the predetermined pattern of dopant material; and removing the top layer of dopant material.