Patent ID: 9236126
Filing Date: 2016-01-12
CPC Classification: G11C,H01L

Claim Text:
1. A nonvolatile memory cell string comprising: two or more cell devices formed in series on a wall type semiconductor protruded from a semiconductor substrate with a predetermined length along one direction to form the cell string, wherein one end of the cell string is electrically connected to outside through a string selection transistor formed on one end of the wall type semiconductor, wherein the other end of the cell string is floated and not electrically connected to outside, wherein the wall type semiconductor is formed with twin fins separated by a trench formed in a longitudinal direction with a predetermined depth from an upper part, wherein each of the twin fins is alternatively formed with channel regions under gate electrodes of the two or more cell devices and the string selection transistor and a plurality of source/drain regions doped with a type of impurity opposite to the channel regions in the longitudinal direction, wherein insulating layers are formed on side walls of the trench separating the twin fins and a shielding electrode is filled between the insulating layers, and wherein a bottom of the shielding electrode is directly contacted with the wall type semiconductor, the shielding electrode being electrically connected to the wall type semiconductor formed in one body with the semiconductor substrate.