Gate Electrode Width Control for Integrated Circuit Reliability

The patent applies local quality by creating an asymmetric gate electrode structure where the gate width is locally reduced at the edge adjacent to the device isolation film. Specifically, the gate electrode has a first width in a first region and a second width in a second region, where the second width is less than the first width. This local width reduction prevents edge channel formation at the critical interface region while maintaining adequate gate coverage over the active channel region, thus preserving threshold voltage stability without requiring uniform gate width reduction that would increase area.

The patent applies asymmetry by designing the gate electrode with different widths at different locations. The gate electrode has a first width in a first region and a second width in a second region, where the second width is less than the first width. This asymmetric configuration allows the gate to be positioned close to the device isolation film without requiring uniform spacing, thereby preventing edge channel formation while minimizing the overall transistor footprint. The asymmetric design optimizes the balance between reliability and area efficiency.