4.7 Article

Photoresponse of high quality epitaxial BiFeO3 films grown through hydrothermal method and rapid microwave assisted method

Journal

CERAMICS INTERNATIONAL
Volume 48, Issue 6, Pages 7778-7783

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.11.325

Keywords

BiFeO3 film; Hydrothermal; Microwave-assisted hydrothermal; Ferroelectric photovoltaic

Funding

  1. National Key R&D Program of China [2020YFC1910000]
  2. National Natural Science Foundation of China [51978153]
  3. Natural Science Foundation of Jiangsu Province [BK20191023]
  4. Scientific Research Foundation of Nanjing Institute of Technology [YJK201909]
  5. Innovative and Entrepreneurial Doctor Foundation of Jiangsu Province

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High quality epitaxial BiFeO3 films were grown on SrTiO3 substrate using hydrothermal and microwave-assisted hydrothermal methods, with enhanced remanent polarization and magnetization. The films exhibited a clear light response and the microwave-assisted hydrothermal grown film showed an open-circuit voltage exceeding the band gap of BiFeO3 due to the ferroelectric photovoltaic effect. These methods provide a simple, inexpensive, and rapid way to grow high quality BiFeO3 films with potential applications in photoelectric detection and photovoltaic.
High quality BiFeO3 film with enhanced remanent polarization and magnetization attracts much interest for its great application potential in information storage and photoelectric devices. Here we grew single-crystal epitaxial BiFeO3 film on SrTiO3 substrate through hydrothermal method at low temperature, the film has a quality higher than any reported BiFeO3 films grown through hydrothermal method. Furthermore, BiFeO3 film was grown through a 25 min rapid microwave-assisted hydrothermal process. The two BiFeO3 films exhibited obvious light response to periodically switching on and off of a LED light, and the film grown through microwave-assisted hydrothermal method produced a 4.7V open-circuit voltage exceeding the band gap of BiFeO3 originating from the ferroelectric photovoltaic effect. These results demonstrate that hydrothermal and microwave-assisted hydrothermal method are simple, inexpensive and rapid to grow high quality epitaxial BiFeO3 film with potential application in photoelectric detection and photovoltaic.

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