Patent ID: 8623748
Filing Date: 2014-01-07
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure, comprising: forming a gate oxide over a semiconductor substrate, a polysilicon over the gate oxide, and a metal silicide over the polysilicon; implanting nitrogen atoms through the metal silicide to penetrate the metal silicide, the polysilicon, the gate oxide, and at least a portion of the semiconductor substrate to locate greater than about 90% by weight of a total weight of the implanted nitrogen atoms proximate an interface of the polysilicon and the metal silicide; and annealing the metal silicide, the polysilicon and the gate oxide to form a first nitrogen concentration peak proximate the interface of the polysilicon and the metal silicide, a second nitrogen concentration peak proximate an interface of the polysilicon and the gate oxide, and a third nitrogen concentration peak proximate an interface of the gate oxide and the semiconductor substrate.