Tuning electrical conductivity, charge transport, and ferroelectricity in epitaxial BaTiO3 films by Nb-doping

The electrical conductivity, charge transport behavior, and ferroelectricity of epitaxial BaNb x Ti1- x O3 films (BNTO, 0.0 ≤ x ≤ 0.5) prepared by pulsed laser deposition are investigated. It is found that Nb-doping can tune the conventional insulating BaTiO3 films from an insulating to highly condu...

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Veröffentlicht in:Applied physics letters 2017-05, Vol.110 (18)
Hauptverfasser: Jing, Xiaosai, Xu, Wenchao, Yang, Cheng, Feng, Jiajun, Zhang, Aihua, Zeng, Yanping, Qin, Minghui, Zeng, Min, Fan, Zhen, Gao, Jinwei, Gao, Xingsen, Zhou, Guofu, Lu, Xubing, Liu, J.-M.
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container_issue 18
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container_title Applied physics letters
container_volume 110
creator Jing, Xiaosai
Xu, Wenchao
Yang, Cheng
Feng, Jiajun
Zhang, Aihua
Zeng, Yanping
Qin, Minghui
Zeng, Min
Fan, Zhen
Gao, Jinwei
Gao, Xingsen
Zhou, Guofu
Lu, Xubing
Liu, J.-M.
description The electrical conductivity, charge transport behavior, and ferroelectricity of epitaxial BaNb x Ti1- x O3 films (BNTO, 0.0 ≤ x ≤ 0.5) prepared by pulsed laser deposition are investigated. It is found that Nb-doping can tune the conventional insulating BaTiO3 films from an insulating to highly conductive semiconducting or metallic state, resulting in a variation of the electrical conductivity of the BNTO films over 105. For x ≤ 0.25, the charge transport is dominated by the small polaron hopping mechanism, while the charge transport for x = 0.5 transits from the bipolaron to the small-polaron, and then the thermal phonon scattering mechanisms with increasing temperature. Interestingly, the piezo-force microscopy imaging reveals the presence of ferroelectricity in the properly Nb-doped conductive BNTO films (x ≤ 0.25) deposited in the presence of a small amount of oxygen (3 × 10−3 Pa). Our work provides additional technical roadmaps to manipulate the conductivity and charge transport behaviors in ferroelectric films, which will boost potential applications in future information storage, sensors, and photovoltaic devices.
doi_str_mv 10.1063/1.4982655
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Our work provides additional technical roadmaps to manipulate the conductivity and charge transport behaviors in ferroelectric films, which will boost potential applications in future information storage, sensors, and photovoltaic devices.</abstract><doi>10.1063/1.4982655</doi><tpages>5</tpages></addata></record>
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title Tuning electrical conductivity, charge transport, and ferroelectricity in epitaxial BaTiO3 films by Nb-doping
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