Patent ID: 7388265

Claim:
A method of forming a semiconductor device, comprising the steps of: providing a semiconductor layer including a first region and a second region; providing a first masking layer over the semiconductor layer, said first masking layer comprising a material that provides a permeable barrier to a dopant, wherein the first masking layer comprises a first thickness portion over the first region of the semiconductor layer and a second thickness portion over the second region of the semiconductor layer, wherein the first masking layer comprises first and second layers, and wherein the first region of the semiconductor layer comprises the first and second layers, and the second region of the semiconductor layer comprises only the first layer; providing a second masking layer that overlies the first thickness portion of the first masking layer and exposes the second thickness portion of the first masking layer; and exposing the first region and second region of the semiconductor layer covered by the first masking layer to the dopant, wherein the first region is lightly doped with the dopant in comparison to the second region.