Patent ID: 8354321

Claim:
A method for forming a device comprising: providing a substrate; implanting first type dopants in the substrate to form a first doped region, wherein the first doped region as formed includes a crystalline vacancy rich region, and a buried amorphous region, wherein the vacancy rich region extends from the surface of the substrate to a top of the buried amorphous region; implanting second type dopants having a second polarity into the substrate to form a second doped region, wherein the second doped region is contained within the first doped region and overlaps both the vacancy rich and buried amorphous regions, and a peak second dopant concentration is located at a depth Rpd from the surface of the substrate, wherein the vacancy rich region has a depth that is greater than or equal to Rpd; recrystallizing the buried amorphous regions; and activating the second type dopants in the second doped region, wherein the crystalline upper vacancy rich region has a sufficient amount of excess vacancies to improve electrical activation in the second doped region above the solid solubility limit.