Vertical channel type nonvolatile memory device and method for fabricating the same
A method for fabricating a vertical channel type nonvolatile memory device includes forming alternately a plurality of interlayer dielectric layers and a plurality of conductive layers over a substrate, forming a trench having a plurality of recesses on a surface of the trench by etching the plurality of interlayer dielectric layers and a plurality of conductive layers, wherein the plurality of recesses are formed at a certain interval on the surface of the trench, forming a charge blocking layer over a plurality of surfaces of the plurality of recesses, forming a charge storage layer over the charge blocking layer for filling a plurality of the remaining recesses with a charge storage material, forming a tunnel dielectric layer to cover the charge storage layer, and forming a vertical channel layer by filling the remaining trench.
1. A vertical channel type nonvolatile memory device comprising:
a vertical channel; and
a plurality of memory cells stacked along the vertical channel,
wherein each of the plurality of memory cells comprises:
a tunnel dielectric layer surrounding a surface of the channel;
a charge storage layer surrounding the tunnel dielectric layer and having portions which are separated from one another by a certain interval; and
a charge blocking layer surrounding the charge storage layer; and
wherein the charge storage layer is formed to surround the tunnel dielectric layer, and a portion of the charge storage layer which is formed between adjoining memory cells is oxidized through an oxidation process to serve as the tunnel dielectric layer.
2. The vertical channel type nonvolatile memory device of claim 1 , wherein the charge storage layer comprises a nitride layer and the oxidized charge storage layer comprises a SiON.
3. The vertical channel type nonvolatile memory device of claim 1 , wherein the charge storage layer comprises a polysilicon layer and the oxidized charge storage layer comprises SiO 2 .
4. A vertical channel type nonvolatile memory comprising:
a vertical channel; and
a plurality of memory cells stacked along the vertical channel,
wherein each of the memory cells comprises:
a tunnel dielectric layer arranged between the vertical channel and a charge storage layer:
the charge storage layer arranged between the tunnel dielectric layer and a charge blocking layer, wherein the plurality of charge storage layers are separated from one another at a certain interval; and
the charge blocking layer arranged between the charge storage layer and a substrate.