Patent ID: 7700426
Filing Date: 2010-04-20
Classification: H01L

Abstract:
1. A method of forming a nonvolatile memory device, comprising: defining first and second active regions respectively in first and second regions of a substrate, the first and second active regions doped with a first-conductivity-type dopant; forming a first insulation layer and a first semiconductor pattern stacked on the first active region, and a second insulation layer and a second semiconductor pattern stacked on the second active region, the first semiconductor pattern being doped with the first-conductivity-type dopant, the second semiconductor pattern being doped with the first-conductivity-type dopant; forming a blocking insulation layer on a surface of the substrate; patterning the blocking insulation layer to form an opening exposing the second semiconductor pattern; counter doping a portion of the second semiconductor pattern with a second-conductivity-type dopant through the opening; forming a control gate conductive layer so as to cover the surface of the substrate and fill the opening; and after the counter doping, forming a floating gate, a blocking insulation pattern and a control gate electrode stacked on the first active region, and a lower gate, an inter-gate pattern having the opening, and an upper gate stacked on the second active region, wherein the floating gate is formed from a portion of the first semiconductor pattern, and the lower gate is formed from the portion of the second semiconductor pattern counter doped with the second-conductivity-type dopant.