Patent ID: 6232207
Filing Date: 2001-05-15
Classification: H01L,Y02E,Y02P,Y10S,Y10T

Abstract:
A doping process for producing a homojunction in a semiconductor substrate into which dopants penetrate by way of diffusion, said process comprising:positioning said semiconductor substrate adjacent a light source having an emission spectrum that includes ultraviolet components;placing a light absorbing mask between a surface of said semiconductor substrate and said light source, said mask having a plurality of regions having respective differing thicknesses corresponding to a pattern of dopant concentration forming said homojunction in said substrate;applying a dopant layer of material containing dopant atoms to said surface of said semiconductor substrate, said dopant layer being disposed between said mask and said surface; andirradiating a surface of said mask with light from said light source, whereby said layer of material containing dopant atoms is impinged upon by a pattern of light from said light source, corresponding to said differing thicknesses of said regions of said light absorbing mask.