Patent ID: 7915128

Claim:
A method of forming a semiconductor device, the method comprising: providing a substrate, the substrate having a first region and a second region; forming a first dielectric layer over the substrate in the first region and the second region; forming a conductive layer over the first dielectric layer in the first region and the second region; forming a first mask layer over the conductive layer in the first region and the second region; patterning the first mask layer to form a first patterned mask, the first mask layer being removed from the second region; forming a second mask layer over the conductive layer in the first region and the second region, the first mask layer comprising a different material than the second mask layer; patterning the second mask layer to form a second patterned mask, the second mask layer being removed from the first region; simultaneously patterning the conductive layer in the first region and the second region, thereby forming a first gate electrode in the first region and a second gate electrode in the second region; simultaneously patterning the first dielectric layer in the first region and the second region, thereby forming a first gate dielectric in the first region and a second gate dielectric in the second region; and implanting ions into the substrate using the first patterned mask as an implant mask.