Patent ID: 9219147
Filing Date: 2015-12-22
Classification: H01L

Abstract:
1. A device comprising: a substrate; a first well and a second well in the substrate, the first well being doped with a first conductivity type dopant, the second well being doped with a second conductivity type dopant, and the second well surrounding the first well; a source in the first well and a drain in the second well; a doped region of the first conductivity type dopant in the first well, the doped region functioning as a body contact to the first well; first and second coplanar gate stacks on the substrate, the first gate stack being formed on a portion of the first well, and the second gate stack being formed on a portion of the second well, the first gate stack and the second gate stack being adjacent each other with no intervening structure; wherein the work function of the second gate stack is higher than the work function of the first gate stack.