Switchable ferroelectric diode and photovoltaic effect in BiFeO3

T. Choi, S. Lee, Y. J. Choi, V. Kiryukhin, S. W. Cheong

Research output: Contribution to journalArticle

1139 Citations (Scopus)

Abstract

Unidirectional electric current flow, such as that found in a diode, is essential for modern electronics. It usually occurs at asymmetric interfaces such as p-n junctions or metal/semiconductor interfaces with Schottky barriers. We report on a diode effect associated with the direction of bulk electric polarization in BiFeO3: a ferroelectric with a small optical gap edge of ̃2.2 electron volts. We found that bulk electric conduction in ferroelectric monodomain BiFeO3 crystals is highly nonlinear and unidirectional. This diode effect switches its direction when the electric polarization is flipped by an external voltage. A substantial visible-light photovoltaic effect is observed in BiFeO3 diode structures. These results should improve understanding of charge conduction mechanisms in leaky ferroelectrics and advance the design of switchable devices combining ferroelectric, electronic, and optical functionalities.

Original languageEnglish
Pages (from-to)63-66
Number of pages4
JournalScience
Volume324
Issue number5923
DOIs
Publication statusPublished - 2009 Apr 3

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Equipment Design
Semiconductors
Metals
Electrons
Light
Direction compound

All Science Journal Classification (ASJC) codes

  • General

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Choi, T. ; Lee, S. ; Choi, Y. J. ; Kiryukhin, V. ; Cheong, S. W. / Switchable ferroelectric diode and photovoltaic effect in BiFeO3. In: Science. 2009 ; Vol. 324, No. 5923. pp. 63-66.
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Choi, T, Lee, S, Choi, YJ, Kiryukhin, V & Cheong, SW 2009, 'Switchable ferroelectric diode and photovoltaic effect in BiFeO3', Science, vol. 324, no. 5923, pp. 63-66. https://doi.org/10.1126/science.1168636

Switchable ferroelectric diode and photovoltaic effect in BiFeO3. / Choi, T.; Lee, S.; Choi, Y. J.; Kiryukhin, V.; Cheong, S. W.

In: Science, Vol. 324, No. 5923, 03.04.2009, p. 63-66.

Research output: Contribution to journalArticle

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