Poly resistor and poly eFuse design for replacement gate technology

摘要

Methods for fabricating a semiconductor device are disclosed. In an example, a method includes forming an isolation region on a substrate, wherein the isolation region extends a depth into the substrate from a substrate surface; forming a recess in the isolation region, wherein the recess is defined by a concave surface of the isolation region; and forming a first gate structure over the substrate surface and a second gate structure over the concave surface of the isolation region.