Patent ID: 8614124
Filing Date: 2013-12-24
Classification: H01L

Abstract:
1. A method of fabricating a nonvolatile trapped-charge memory device, comprising: forming a tunneling layer on a substrate, wherein forming the tunneling layer comprises oxidizing the substrate to form an oxide film and nitridizing the oxide film; forming a multilayer oxynitride charge trapping layer on the tunneling layer comprising an oxygen-rich bottom layer and an oxygen-lean top layer; depositing a blocking layer on the charge trapping layer; densifying the blocking layer with an oxidizing anneal, wherein the oxidizing anneal oxidizes at least a portion of the oxygen-lean top layer of the multilayer oxynitride charge trapping layer, the oxidized portion proximate to the blocking layer and equal to approximately one half of the oxygen-lean top layer; and forming a gate layer on the densified blocking layer.