Patent ID: 6080600
Filing Date: 2000-06-27
Classification: H01L,Y02E

Abstract:
A method for fabricating a semiconductor photodiode, comprising the steps of:forming an epitaxial layer of a second conductivity type on a semiconductor substrate of a first conductivity type;etching predetermined parts of said epitaxial layer to produce an island-like epitaxial layer;growing an insulating layer doped with impurity of high concentration, suited for producing a semiconductor of a second conductivity type, on surfaces of said semiconductor substrate and said island-like epitaxial semiconductor layer;eliminating said insulating layer except a side surface of said island-like epitaxial layer by means of anisotropic etching; andforming an impurity diffusion layer of a second conductivity type on a part of a side surface of said island-like epitaxial layer at least by thermal treatment;wherein said island-like epitaxial layer and said semiconductor substrate form a PN-junction for said semiconductor photodiode, andwherein concentration of impurity in said impurity diffusion layer, being thermally diffused from said insulating layer, is higher than that of an internal portion of said island-like epitaxial layer.