Novel visible-light-driven photoconductive properties of LaCoO3 epitaxial nano-thin films

Novel visible-light-driven photoconductive properties of LaCoO3 epitaxial nano-thin films
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LaCoO3 外延纳米薄膜的新型可见光驱动光电导特性

DOI:
10.1016/j.matlet.2017.08.070
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发表时间:
2017-12
期刊:
影响因子:
3
通讯作者:
Li Chengbo
Li Chengbo
中科院分区:
材料科学3区
文献类型:
--
作者:
Liu Haifeng;Guo Baogang;Zheng Kui;Xie Ruishi;Zhang Xingquan;Wu Xiaoyu;Zhang Yanping;Li Chengbo

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采用聚合物辅助沉积法分别在(0 0 1)、(1 1 0 0)和(1 1 1)取向的srtio3衬底上生长了lacoo3纳米薄膜。所有lacoo3薄膜均沿STO取向外延生长,具有双轴拉伸应变。薄膜,特别是(1111)取向薄膜,表现出优异的可见光光导性能。应变诱导的Co-O键长增加可能有助于减小Co3+的t2g-egg间隙,并进一步增加光激退行电子的数量。lacoo3外延膜光导活性的不同可能与晶体面表面能的不同有关。这表明lacoo3外延薄膜可以被认为是可见光光电探测器的潜在候选材料。
LaCoO3nano-thin films were grown on (0 0 1), (1 1 0) and (1 1 1) oriented SrTiO3substrates by the polymer assisted deposition method, respectively. All the LaCoO3films are in epitaxial growth in accordance with the orientation of STO, with biaxial tensile strain. The films, especially for (1 1 1) oriented film, exhibit excellent visible-light photoconductive properties. The strain-induced increase of Co-O bond length may contribute to reduce thet2g-eggap of Co3+and further increase the number of photoexcitedegitinerant electrons. The different photoconductive activity of LaCoO3epitaxial films may be attributed to the different surface energies of crystal planes. It suggests that the LaCoO3epitaxial film can be considered as a potential candidate for visible-light photodetector.
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