Patent ID: 10811425

Abstract:
An NOR flash memory comprising a memory cell of a 3D structure and a manufacturing method thereof are provided. The flash memory 100 includes a plurality of columnar portions 120, a plurality of charge accumulating portions 130 and a plurality of control gates 140. The columnar portions 120 extend from a surface of a silicon substrate 110 in a vertical direction and include an active region. The charge accumulating portions 130 are formed by way of surrounding a side portion of each columnar portion 120. The control gates 140 are formed by way of surrounding a side portion of each charge accumulating portion 130. One end portion of the columnar portion 120 is electrically connected to a bit line 150 via a contact hole, and another end portion of the columnar portion 120 is electrically connected to a conductive region formed on a surface of the silicon substrate 110.