Mechanism of the Switchable Photovoltaic Effect in Ferroelectric BiFeO3

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...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2011-08, Vol.23 (30), p.3403-3407
Main Authors: Yi, H. T., Choi, T., Choi, S. G., Oh, Y. S., Cheong, S.-W.
Format: Article
Language:English
Subjects:
BiFeO3
Bismuth - chemistry
Crystallization
Electrodes
Ferric Compounds - chemistry
ferroelectric
Gold - chemistry
interfaces
MATERIALS SCIENCE
Oxides - chemistry
photovoltaics
SOLAR ENERGY
switchable photocurrent
Temperature
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Summary: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.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201100805