Electrical Bistable Devices Based On Composites Of Polyvinyl Pyrrolidone And PbSe Superlattices

Organic bistable devices have emerged as excellent candidates for ideal data storage devices and logic circuits because of low cost,high flexibility,easy fabrication,and low operating power.Many studies on electrical bistable devices based on organic/inorganic nanoparticle composites have been carried out.In this paper,we prepared three dimensional self-assembled PbSe superlattices and SiO2-modified PbSe superlattices and fabricated nonvolatile bistable devices utilizing the nanoscale PbSe superlattices embedded in Polyvinyl Pyrrolidone(PVP)layers or mixed with Polyvinyl Pyrrolidone(PVP).We investigated the carrier transport,electrical bistability,and memory mechanism of the devices on the basis of current-voltage characteristics.The main results are described as follows:1.The current-voltage characteristics for the devices with an architecture of indium-tin-oxide(ITO)/PVP/PbSe superlattices/PVP/Al exhibit electrical bistabilities and memory behaviors due to the trapping,storring,and detrapping of the PbSe superlattices.The maximum ON/OFF ratio of the current bistability for the optimal device is 7×104,and it is maintained for 1×104 seconds with little degradation.The electrical bistable properties and the carrier transport mechanisms of the devices are interpreted by the conduction models based on the results of fitting the current-voltage curves.2.The current-voltage characteristics for the devices with an architecture of indium-tin-oxide(ITO)/PEDOT:PSS/PVP:SiO2 modified-PbSe superlattices/Al exhibit electrical bistabilities and memory behaviors due to the trapping,storring,and detrapping of the SiO2 modified-PbSe superlattices.The maximum ON/OFF ratio of the current bistability for the optimal device is 104.The electrical bistable properties and the carrier transport mechanisms of the devices are interpreted by the conduction models based on the results of fitting the current-voltage curves.