Patent ID: 8999733
Filing Date: 2015-04-07
Classification: H01L

Abstract:
1. A method of forming a resistive random-access memory (RRAM) structure, comprising: forming a bottom electrode; forming a dielectric barrier layer on the bottom electrode; forming a dielectric middle layer on the dielectric barrier layer; forming a dielectric screen layer on the dielectric middle layer, wherein the dielectric barrier layer, the dielectric middle layer, and the dielectric screen layer are successively formed on the bottom electrode to thereby constitute a tri-layer resistive stack; performing an oxygen treatment or a nitrogen treatment on the tri-layer resistive stack to introduce oxygen or nitrogen ions into the dielectric middle layer; and forming a top electrode on the dielectric screen layer, wherein the dielectric screen layer and the dielectric barrier layer respectively block diffusion of the oxygen ions or nitrogen ions to the top electrode and the bottom electrode.