Patent ID: 8487378
Filing Date: 2013-07-16
Classification: G01N,H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor layer disposed over a substrate, the semiconductor layer having a fin structure; a gate structure disposed over the fin structure, the gate structure having a gate dielectric layer and a gate electrode layer, the gate structure wrapping around a portion of the fin structure; and source/drain regions disposed in the fin structure; wherein a doping profile across the fin structure is non-uniform, and wherein a first region of the portion of the fin structure being wrapped around by the gate structure has a lower doping concentration level than the rest of the fin structure, wherein the fin structure includes the first region, a second region, and a third region, and wherein: wherein the first region physically contacts the second region and the second region physically contacts the third region, and wherein the second region has a substantially uniform second doping concentration that extends laterally within the fin structure from under the gate structure to under a spacer on a sidewall of the gate structure and the third region has a substantially uniform third doping concentration that extends laterally within the fin structure from under the spacer to beyond an outer edge of the spacer away from the gate structure.