Patent ID: 8440540

Claim:
A method, comprising: providing a substrate; forming a protective layer over the substrate, the protective layer having a first thickness; forming a patterned photoresist layer over the protective layer, the patterned photoresist including first and second openings and being different than the protective layer; forming an upwardly open first recess and an upwardly open second recess in the substrate, the first and second recesses being aligned with the first and second openings; growing a lining oxide on a surface of the substrate within at least the first recess; forming a mask over the second recess and the second opening; thereafter implanting a dopant into a first region of the substrate through the first opening, the protective layer protecting a second region of the substrate from the dopant, the second region being different from the first region, and wherein the mask prevents the dopant from being implanted through the second opening; after implanting the dopant into the first region of the substrate through the first opening, reducing the thickness of the protective layer to a second thickness less than the first thickness; and after the reducing of the thickness of the protective layer, forming a dielectric material within at least the first recess.