Patent ID: 7759186
Filing Date: 2010-07-20
Classification: H01L

Abstract:
1. A method of fabricating a junction termination extension in an electronic, the junction termination extension having a controlled arbitrary lateral doping profile and a controlled arbitrary lateral width, comprising: depositing a photosensitive material onto a semiconductor substrate, the semiconductor substrate including a junction termination zone; exposing the photosensitive material to light through a mask containing a mask pattern of opaque and clear areas, a light flux image produced by the mask pattern of opaque and clear areas being projected onto the photosensitive material in an unresolved manner to obscure fine details in the opaque and clear areas of the mask pattern and provide a controlled laterally tapered profile and a controlled lateral width of light flux onto the photosensitive material; developing the photosensitive material in a solution wherein the photosensitive material dissolves at a rate proportional to an amount of light flux absorbed during the exposure to produce a laterally tapered dopant mask having a controlled laterally tapered thickness profile with controlled lateral width corresponding to the controlled laterally tapered profile and the controlled lateral width of light flux onto the photosensitive material; and introducing dopants into the semiconductor substrate to produce the junction termination extension in the electronic device, the dopants in the semiconductor having the controlled laterally tapered thickness profile and controlled lateral width of the dopant mask and the electronic device comprising a terminal operatively connected to the junction termination extension, the junction termination extension being aligned with the terminal.