Electrical Bistable Properties of P-25 TiO2 Nanoparticles Composited with PVP for Memory Devices

Abstract

In this work, P-25 titanium dioxide nanoparticles (TiO2 NPs) were composited with poly-vinylpyrrolidone (PVP) at various concentrations of TiO2 NPs. The bistable memory devices were fabricated by spin coating from a prepared PVP:TiO2 NPs solution on indium tin oxide (ITO) electrodes with the device structure of ITO/PVP:TiO2 NPs/Al. The maximum ON/OFF current ratio of the bistable memory devices was approximately 105 at a reading voltage of +1 V. The mechanism of the memory device can be expressed by theoretical fitting between the experimental results and conduction models. Moreover, a retention time test for continuous read operations of the device is presented.