Patent ID: 8524543

Claim:
A method of forming a semiconductor device, comprising: forming a semiconductor structure comprising amorphous silicon overlying an electrically insulative material, a conductive material overlying the amorphous silicon, a doped material overlying the conductive material and a doped crystalline silicon overlying the doped material; removing portions of each of the doped crystalline silicon, the doped material, the conductive material and the amorphous silicon to form a plurality of channels exposing the electrically insulative material; removing portions of the doped crystalline silicon and the doped material to form a plurality of pillars, each pillar of the plurality of pillars including a first doped region and a second doped region oppositely doped with respect to the first doped region; forming at least one control gate on at least one surface of each pillar of the plurality of pillars; exposing the plurality of pillars to a first dopant to form a third doped region, oppositely doped with respect to the second doped region; and exposing the plurality of pillars to a second dopant to form a fourth doped region.