Patent ID: 6399458
Filing Date: 2002-06-04
Classification: H01L

Abstract:
A method of forming a diffusion region in a silicon substrate, said method comprising the steps of:(a) subjecting a silicon substrate to a first ion implantation step, said first ion implantation step is carried out at an ion dose of from about 1Ã—1014 to about 5Ã—1014 atoms/cm2 and an energy of 50 KeV or greater such that a region of amorphized Si is formed in said silicon substrate, said region of amorphized Si is formed at a depth of from about 80 to about 150 nm below the surface of the silicon substrate; (b) subjecting said silicon substrate containing said region of amorphized Si to a second ion implantation step, said second ion implantation step is carried out by implanting a dopant ion into said silicon substrate under conditions such that the peak of implant of said dopant ion is within the region of amorphized Si; and (c) annealing said silicon substrate under conditions such that said region of amorphized Si is re-crystallized thereby forming a diffusion region in said silicon substrate.