Patent ID: 8735247

Claim:
A method for fabricating a nonvolatile memory device, the method comprising: forming a first structure for a common source line on a semiconductor substrate, the first structure extending along a first direction; forming a mold structure by alternately stacking a plurality of sacrificial layers and a plurality of insulating layers on the semiconductor substrate; forming a plurality of openings in the mold structure exposing a portion of the first structure; and forming a first memory cell string at a first side of the first structure and a second memory cell string at a second, opposite side of the first structure, wherein the plurality of openings include a first through-hole and a second through-hole, heach through-hole passing through the plurality of sacrificial layers and plurality of insulating layers, and the first through-hole and the second through-hole overlap each other in the first direction; wherein the forming of the structure comprises forming a trench in the semiconductor substrate extending along the direction, and forming a sacrificial pattern in the trench.