Patent ID: 8399323
Filing Date: 2013-03-19
Classification: H01L

Abstract:
1. A method for fabricating a vertical channel type nonvolatile memory device, comprising: stacking a plurality of interlayer insulating layers and a plurality of conductive layers alternately over a substrate; etching the interlayer insulating layers and the conductive layers to form a channel trench exposing the substrate; forming an undoped first channel layer over a structure including the channel trench; forming a buffer layer over the undoped first channel layer; performing a doping process onto the stacked structure including the buffer layer and the undoped first channel layer with impurities to form a doped first channel layer and a doped buffer layer, wherein the doped first channel layer has a lower concentration of impurities than a concentration of impurities in the doped buffer layer; removing the doped buffer layer after performing of the doping process; and filling the channel trench with a second channel layer.