Tunable photovoltaic effects induced by different cooling oxygen pressure in Bi0.9La0.1FeO3 thin films

被引：42

作者：

Gao, R. L. ^{[1
]}

Yang, H. W. ^{[2
,3
]}

Fu, C. L. ^{[1
]}

Cai, W. ^{[1
]}

Chen, G. ^{[1
]}

Deng, X. L. ^{[1
]}

Sun, J. R. ^{[2
,3
]}

Zhao, Y. G. ^{[4
,5
]}

Shen, B. G. ^{[2
,3
]}

机构：

[1] Chongqing Univ Sci & Technol, Sch Met & Mat Engn, Chongqing 401331, Peoples R China

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[4] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[5] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 624卷

基金：

中国国家自然科学基金;

关键词：

Photovoltaic effects; Bi0.9La0.1FeO3 thin films; Oxygen vacancies; Schottky barrier; Polarization; FERROELECTRIC BIFEO3; BULK;

D O I：

10.1016/j.jallcom.2014.10.180

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photovoltaic effects in Bi0.9La0.1FeO3 thin films are found to be strongly dependent on the oxygen concentration which can be manipulated by cooling oxygen pressure. Switchable photovoltaic effects can be observed without any electric field applied in low oxygen pressure cooled samples, however, it is hard to detect with high oxygen pressure cooled samples, until the occurrence of polarization flipping by applied electric field. This switchable photovoltaic effects can be explained well by the variation of the Schottky barrier at the metal-Bi0.9La0.1FeO3 interface resulting from the combination of oxygen vacancies and polarization. The sign of photocurrent could be independent of the direction of polarization when the modulation of the energy band induced by oxygen vacancies is large enough to offset that induced by polarization. The photo-current induced by the electro migration of oxygen vacancies is variable due to the diffusion of defects such as oxygen vacancies or the recombination of oxygen vacancies with hopping electrons. Our work provides new ideas for tuning the photovoltaic effect in ferroelectric materials. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：1 / 8

页数：8

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