Patent ID: 8891307

Claim:
A nonvolatile memory device comprising: a first NAND string including a first string selection transistor, a first ground selection transistor having a threshold voltage that is higher than a threshold voltage of the first string selection transistor, and first memory cells stacked on a substrate; a second NAND string including a second string selection transistor, a second ground selection transistor having a threshold voltage that is higher than a threshold voltage of the second string selection transistor, and second memory cells stacked on the substrate; a first selection line, the first selection line being connected to the first string selection transistor by a first string selection line, and the first selection line being connected to the first ground selection transistor by a first ground selection line; and a second selection line that is electrically isolated from the first selection line, the second selection line being connected to the second string selection transistor by a second string selection line, and the second selection line being connected to the second ground selection transistor by a second ground selection line.