Photovoltaic effect of a bilayer film with Bi4Ti3O12/BiFeO3 heterostructure
Photovoltaic effect of a bilayer film with Bi4Ti3O12/BiFeO3 heterostructure
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Bi4Ti3O12/BiFeO3异质结构双层薄膜的光伏效应
DOI：
10.1016/j.matlet.2015.05.008
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发表时间：
2015
影响因子：
3
通讯作者：
Zhang W. F.
中科院分区：
文献类型：
--
作者：
Zhang J. X.;Zheng H. W.;Zhang Y. G.;Yuan G. L.;Gao W. X.;Liu Ky.;Yin G. S.;Gu Y. Z.;Zhang W. F.
采用溶胶-凝胶法在氟掺杂氧化锡导电玻璃上制备Bi4Ti3O12/BiFeO3(BTO/BFO)异质结构双层薄膜。 X射线衍射结果表明，除了BTO和BFO的特征衍射峰外，没有发现额外的物相。压电力显微镜测量证实了完整的域切换和局部铁电性质。测得双层膜的开路电压和短路电流密度分别约为 0.38 V 和 -56.24 µA cm-2，高于 BTO 的开路电压和短路电流密度。 BTO/BFO薄膜表现出可重复且稳定的光电流瞬时响应。构建了p-n异质结构与铁电极化相结合的理论能带图模型来描述薄膜的光伏增强机制。
Bi4Ti3O12/BiFeO3(BTO/BFO) heterostructure bilayer film is prepared on fluorine-doped tin oxide conductive glass by a sol–gel process. The X-ray diffraction result shows that no additional phase can be found besides the characteristic diffraction peaks of BTO and BFO. Piezoelectric force microscopy measurement confirms the complete domain switching and local ferroelectric nature. The open circuit voltage and short circuit current density of the bilayer film are measured to be about 0.38 V and −56.24 µA cm−2, respectively, higher than those of the BTO. The BTO/BFO film exhibits repeatable and stable instantaneous response of photocurrent. A theoretical band diagram model combiningp–nheterostructure with ferroelectric polarization is constructed to describe the mechanism of photovoltaic enhancement of the film.