Patent ID: 8685806

Claim:
A method, comprising: providing a silicon-on-insulator substrate, said silicon-on-insulator substrate comprising a silicon layer separated from a silicon substrate by a buried dielectric layer and including a doped layer in said substrate, said doped layer adjacent to said dielectric layer, said doped layer not formed by ion-implantation of a dopant species through said silicon layer; forming a photoresist layer on a top surface of said silicon layer; forming an opening in said photoresist layer, a region of said top surface of said silicon layer exposed in a bottom of said opening; ion implanting a dopant species into a portion of said doped layer under said opening to form an ion-implanted region in said doped layer, said photoresist layer blocking ion-implantation of said dopant species into said silicon layer, said dopant species of an opposite type than dopant in said doped layer; after said ion-implanting, removing said photoresist layer; and heating said silicon-on-insulator substrate to activate said dopant species in said ion-implanted region of said doped layer to form a doped region in said doped layer, said doped region and said doped layer comprising a diode.