Flexible nonvolatile resistive memory devices based on SrTiO3 nanosheets and polyvinylpyrrolidone composites

Abstract

Strontium titanate (SrTiO₃) ultra-thin-nanosheets with an average thickness of 3.1 ± 0.2 nm have been synthesized via a solvothermal reaction route with ethylene glycol as the reaction medium solvent. The as-prepared SrTiO₃ nanosheet and polyvinylpyrrolidone (PVP) (SrTiO₃–PVP) composites were formed into large-scale high-integrity thin films on polyethylene terephthalate (PET) by using a spin-coating method. A flexible memory device with the configuration of Ag/SrTiO₃–PVP/Pt/PET was fabricated and it showed a promising write-once read-many times memory effect with a high ON/OFF current ratio of more than 1.0 × 10³, an ultralow switching voltage (0.17 V), good stability, good repeatability and flexibility. SrTiO₃ nanosheets acting as trapping centers in the device play a significant role in the resistive switching mechanisms. We hope that the benefits of ultralow switching voltage and flexible characteristics will make this material promising for next generation nonvolatile functional memory applications.