Patent ID: 8946810
Filing Date: 2015-02-03
Classification: H01L

Abstract:
1. A monolithic three dimensional NAND string, comprising: a semiconductor channel located over a substrate, the semiconductor channel having a U-shaped side cross section, wherein two wing portions of the U-shaped semiconductor channel which extend substantially perpendicular to a major surface of the substrate are connected by a connecting portion which extends substantially parallel to the major surface of the substrate; an insulating fill located over the connecting portion and separating two wing portions of the U-shaped semiconductor channel; a plurality control gate electrodes extending substantially parallel to the major surface of the substrate, wherein the plurality of control gate electrodes comprise at least a first control gate electrode located in a first device level and a second control gate electrode located in a second device level located over the substrate and below the first device level; a blocking dielectric is located in contact with the plurality of control gate electrodes; a charge storage material; and a tunneling dielectric located between the charge storage material and the semiconductor channel.