Patent ID: 7994003
Filing Date: 2011-08-09
Classification: H01L

Abstract:
1. A method of fabricating a nonvolatile memory device, comprising: forming a tunnel insulating layer on a semiconductor substrate; forming a charge storage layer on the tunnel insulating layer; forming a dielectric layer on the charge storage layer, the dielectric layer including a first aluminum oxide layer, a silicon oxide layer, and a second aluminum oxide layer sequentially stacked on the charge storage layer; forming a gate electrode on the dielectric layer, the gate electrode directly contacting the second aluminum oxide layer of the dielectric layer; performing a first thermal treatment on the first aluminum oxide layer at a first thermal treatment temperature to form a crystallized first aluminum oxide layer, the thermal treatment being performed before forming the silicon oxide layer on the first aluminum oxide layer; and performing a second thermal treatment on the second aluminum oxide layer at a second thermal treatment temperature different from the first thermal treatment temperature to form a crystallized second aluminum oxide layer, the thermal treatment being performed before forming the gate electrode on the second aluminum oxide layer.