Patent ID: 8242034
Filing Date: 2012-08-14
Classification: H01L

Abstract:
1. A method for fabricating a phase change memory device, comprising: providing a substrate with a first conductive layer formed thereon; forming a first dielectric layer over the first conductive layer and the substrate; forming a heating electrode in a portion of the first dielectric layer, wherein the heating electrode penetrates the first dielectric layer and contacts the first conductive layer; performing a first etching process to the first dielectric layer, reducing a thickness of the first dielectric layer and partially exposing a portion of the heating electrode; performing an oxidation process, forming an oxide layer on a top surface and a sidewall of the portion of the heating electrode exposed by the first dielectric layer; performing a second etching process, reducing portions of the oxide layer, exposing a top surface of the portion of the heating electrode exposed by the first dielectric layer, and leaving an oxide spacer on the sidewall of the portion of the heating electrode exposed by the first dielectric layer; forming a phase change material layer over a portion of the first dielectric layer, wherein the phase change material layer covers the portion of the heating electrode exposed by the first dielectric layer and the oxide spacer, and contacts the top surface of the portion of the heating electrode exposed by the first dielectric layer; and forming a second conductive layer over the phase change material layer, contacting the phase change material layer.