Patent ID: 8675409
Filing Date: 2014-03-18
Classification: G11C

Abstract:
1. A non-volatile memory device comprising: a semiconductor substrate including an active region at a surface thereof; a ground select line crossing the active region; a string select line crossing the active region and spaced apart from the ground select line; and a plurality of word lines crossing the active region between the ground select line and the string select line wherein about a same first spacing is provided between adjacent ones of the plurality of word lines and between the string select line and a first of the plurality of word lines that is closest to the string select line, and wherein a second spacing that is at least three times greater than the first spacing is provided between the ground select line and a second of the plurality of word lines that is closest to the ground select line and wherein an entirety of the second spacing across the active region between the ground select line and the second of the plurality of word lines is free of word lines and free of ground select lines.