Mechanism of switchable and nonswitchable short-circuit photocurrent accompanying polarization switching in Bi0.9La0.1FeO3thin films
Mechanism of switchable and nonswitchable short-circuit photocurrent accompanying polarization switching in Bi0.9La0.1FeO3thin films
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DOI：
10.1209/0295-5075/105/37008
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
R. Gao;H. Yang;Y. S. Chen;J. Sun;Y. Zhao;B. Shen
中科院分区：
文献类型：
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作者：
R. Gao;H. Yang;Y. S. Chen;J. Sun;Y. Zhao;B. Shen
研究了Bi_（0.9）La_（0.1）Fe_（0.3）外延薄膜的短路光电流。观察到了伴随着极化转变的可开关和不可开关现象，并用氧空位、极化和导电畴壁共同控制的漂移电流和扩散电流的概念进行了解释。当由氧空位或导电畴壁引起的光电流调制足够大以抵消由极化引起的光电流调制时，光电流的符号与极化方向无关。我们的工作提供了一个深刻的洞察铁电薄膜中的光伏效应的性质，并将促进先进的设计结合自旋电子，电子和光学功能的可切换设备。
The short-circuit photocurrent of Bi0.9La0.1FeO3 epitaxial thin films has been investigated. Switchable and nonswitchable accompanying polarization switching was observed and it can be explained well using the concepts of drift current and diffusion current controlled by the combination of oxygen vacancies, polarization and conductive domain wall. The sign of photocurrent is independent of the polarization direction when the modulation of photocurrent induced by oxygen vacancies or conductive domain walls is large enough to offset that induced by polarization. Our work provides a deep insight into the nature of photovoltaic effects in ferroelectric films, and will facilitate the advanced design of switchable devices combining spintronic, electronic, and optical functionalities.