Patent ID: 7397090
Filing Date: 2008-07-08
Classification: H01L

Abstract:
1. A semiconductor device having a first well of a first conductivity type and a second well of a second conductivity type, the semiconductor device comprising: a gate dielectric layer extending over at least a portion of the first well and the second well; a first gate electrode disposed on the gate dielectric layer and extending over the first well, the first gate electrode comprising a multi-layer stack, comprising: a first source electrode and a first drain electrode formed in the first well adjacent to the first gate electrode; a second gate electrode disposed on the gate dielectric layer and extending over the second well, the second gate electrode comprising a portion of the first thick metal/metal nitride layer; and a second source electrode and a second drain electrode formed in the second well adjacent to the second gate electrode, wherein the first, second, and third thin metal/metal nitride layers are of an amorphous form and the first thick metal/metal nitride layer is of a polycrystalline form.