Journal
ACTA MATERIALIA
Volume 217, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.117173
Keywords
Flexible; Ferroelectric; Thin film; Photovoltaic; Resistive switching
Funding
- Natural Science Foundation of China [51702169]
- Natural Science Foundation of Inner Mongolia [2019ZD12, 2021JQ06, 2017BS0503]
- Grassland Talent Innovation Team of Inner Mongolia Autonomous Region
- Young Innovation Talents Fund of Baotou
- Innovation Guide Fund for Science and Technology of Inner Mongolia Autonomous Region [KCBJ2018034]
- Plan Project for Science and Technology of Baotou [2019P3070]
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This study prepared an all-inorganic flexible ferroelectric thin film by sol-gel method, showing excellent photovoltaic stability and optically tunable resistive switching behavior. The photovoltaic effect modulates the energy band structure, leading to an increased ON/OFF ratio of resistance, providing a promising route for the development of multifunctional flexible photo-electrical materials.
The immense potential of photo-electrical materials applied in intelligent and wearable electronic devices has motivated many researches on flexible ferroelectric thin film. However, how to enhance stability of output and achieve multifunction is still a challenge. Here, an all-inorganic flexible ferroelectric thin film with Au/Bi2FeMo0.7Ni0.3O6/LaNiO3/Nickel foil structure is prepared by sol-gel method. The thin film exhibits excellent photovoltaic stability. The change rates of the short circuit currents and open circuit voltages are less than 5% in different bending states and after bending-releasing cycles, which is attributed to its stable self-polarization characteristic. Furthermore, an optically tunable resistive switching behavior is found in the thin film. The switching voltages and ON/OFF ratio of resistance can be tuned in real time by on-off control of light, demonstrating a correlation between resistive switching and photovoltaic effect. It is proposed that the photovoltaic effect modulates the energy band structure of the thin film, leading to an increased ON/OFF ratio of resistance. This work opens up a promising route to the development of multifunctional flexible photo-electrical materials. (C) 2021 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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