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Advanced Materials

Mechanism of the Switchable Photovoltaic Effect in Ferroelectric BiFeO3

Authors

  • H. T. Yi,

    1. Rutgers Center for Emergent Materials, Dept. Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
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  • T. Choi,

    1. Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    Current affiliation:
    1. Energy & Environment Materials Research Center, Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143–747, Korea
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  • S. G. Choi,

    1. National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, CO 80401, USA
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  • Y. S. Oh,

    1. Rutgers Center for Emergent Materials, Dept. Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
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  • S.-W. Cheong

    Corresponding author
    1. Rutgers Center for Emergent Materials, Dept. Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
    • Rutgers Center for Emergent Materials, Dept. Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA.
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Abstract

Directions of rectification and photocurrent in a ferroelectric BiFeO3 crystal can be switched by applying high-voltage pulses at room temperature. The switching is highly repeatable though cycling and also stable with time. This switchable photocurrent and diode effect results from the combination of polarization flipping and electromigration of oxygen vacancies.

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