Patent ID: 8759946
Filing Date: 2014-06-24
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor layer over an insulating surface; a second semiconductor layer over the insulating surface; a gate electrode over the first semiconductor layer with a first insulating layer interposed therebetween; a first electrode over the second semiconductor layer with a second insulating layer interposed therebetween, the first electrode being provided in the same layer as the gate electrode; a sidewall insulating layer on a side surface of the first electrode, wherein the sidewall insulating layer is provided over and in contact with the insulating surface, and wherein the sidewall insulating layer has an inner side surface which contacts the side surface of the first electrode and an outer side surface opposite to the inner side surface; a source electrode and a drain electrode over and in contact with the first semiconductor layer; a third semiconductor layer over the first electrode and the sidewall insulating layer, wherein the third semiconductor layer is provided over and in contact with the insulating surface, and wherein the third semiconductor layer is provided in contact with the outer side surface of the sidewall insulating layer so that the sidewall insulating layer is interposed between the first electrode and the third semiconductor layer; and a second electrode over the first electrode with the third semiconductor layer interposed therebetween, wherein the third semiconductor layer crosses the first electrode, wherein a material of the first electrode is the same as a material of the gate electrode; wherein a material of the second electrode is the same as a material of the source electrode and the drain electrode, wherein the first electrode, the sidewall insulating layer, the third semiconductor layer, and the second electrode are included in a memory element, and wherein the memory element is capable of changing its state from a first state to a second state upon an application of a voltage, where a resistance between the first electrode and the second electrode is higher in the first state than in the second state.