Patent ID: 9478291
Filing Date: 2016-10-25
CPC Classification: G11C,H01L

Claim Text:
1. A semiconductor device comprising: a substrate; a first ground select electrode on the substrate; a second ground select electrode on the first ground select electrode; a plurality of cell electrodes on the second ground select electrode; a first string select electrode on the plurality of cell electrodes; a second string select electrode on the first string select electrode; a string selection line connected to the first string select electrode with a first string select contact plug and connected to the second string select electrode with a second string select contact plug; and a ground selection line connected to the first ground select electrode with a first ground select contact plug and connected to the second ground select electrode with a second ground select contact plug, wherein a vertical length of the first string select contact plug is different from a vertical length of the second string select contact plug, and a vertical length of the first ground select contact plug is different from a vertical length of the second ground select contact plug.