Patent ID: 6472684
Filing Date: 2002-10-29
Classification: G11C,H01L

Abstract:
A nonvolatile memory comprising:a plurality of memory cells being arranged in a matrix form, each of said memory cells including a memory TFT and a switching TFT, said memory TFT including, a first semiconductor active layer formed over a substrate having an insulating surface, a first gate insulating film formed over said first semiconductor active layer, a floating gate electrode formed over said first gate insulating film, an anodic oxide film formed by anodizing said floating gate electrode, and a control gate electrode formed over said anodic oxide film, said switching TFT including, a second semiconductor active layer formed over the substrate having the insulating surface, a second gate insulating film formed over said second semiconductor active layer, and a gate electrode formed over said second gate insulating film, wherein said memory TFT and said switching TFT are integrally formed over said substrate, and wherein s aid first semiconductor active layer of the memory TFT is thinner than said second semiconductor active layer of the switching TFT.