Patent ID: 6057216
Filing Date: 2000-05-02
Classification: H01L,Y10S

Abstract:
A method of forming a doped semiconductor region in a semiconductor substrate having a semiconductor surface in a trench in said substrate, said method comprising:(a) applying a dopant-containing glass layer on said semiconductor surface in said trench, said glass having a dopant concentration of at least about 10.sup.21 atoms/cm.sup.3,(b) capping said dopant-containing oxide glass layer with a conformal silicon oxide layer,(c) heating said substrate from step (b) at a temperature of about 1000.degree. C. to 1100.degree. C. for about 1-30 minutes in a non-oxidizing atmosphere whereby at least a portion of said dopant in said glass diffuses into said substrate at said semiconductor surface,(d) heat the substrate resulting from step (c) at about 850-975.degree. C. for at least about 1 minute in an oxidizing atmosphere whereby at least a portion of the dopant in said glass near said semiconductor surface is forced into said substrate at said semiconductor surface by diffusion of oxygen through said glass.