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HomeMaterials Science ForumMaterials Science Forum Vol. 815Enhancement of Oxygen Vacancies Induced...

Enhancement of Oxygen Vacancies Induced Photovoltaic Effects in Bi_0.9La_0.1FeO₃ Thin Films

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Abstract:

The photovoltaic effect in Ag/Bi_0.9La_0.1FeO₃/La_0.7Sr_0.3MnO₃ heterostructures was investigated and the short circuit photocurrent was found to be strongly dependent on the polarization orientation and oxygen vacancies (V_Os) distribution. The photocurrent direction was switched accompanying polarization switching. Besides, according to manipulate the V_Os accumulated at either the Ag/Bi_0.9La_0.1FeO₃ or the Bi_0.9La_0.1FeO₃/La_0.7Sr_0.3MnO₃ interface by electric pulses, obvious enhancement of photovoltaic effects was obtained. These results can be explained well using the concepts of drift current and diffusion current controlled by the combination of oxygen vacancies and polarization. This work provides deep insights into the nature of photovoltaic effects in ferroelectric films, and will facilitate the advanced design devices combining spintronic, electronic, and optical functionalities.

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Materials Science Forum (Volume 815)

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176-182

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https://doi.org/10.4028/www.scientific.net/MSF.815.176

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Online since:

March 2015

Authors:

Rong Li Gao*, Chun Lin Fu, Wei Cai, Gang Chen, Xiao Ling Deng, Huai Wen Yang, Ji Rong Sun, Bao Gen Shen

Keywords:

BiFeO₃, Oxygen Vacancies, Photovoltaic Effect

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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