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Nanomaterials 2016, 6(11), 215;

Photoelectrochemical Performance Observed in Mn-Doped BiFeO3 Heterostructured Thin Films

State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
High-Tech Institute of Xi’an, Xi’an 780025, China
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
Author to whom correspondence should be addressed.
Academic Editor: Hongqi Sun
Received: 9 October 2016 / Revised: 8 November 2016 / Accepted: 11 November 2016 / Published: 16 November 2016
(This article belongs to the Special Issue Nanoscale in Photocatalysis)
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Pure BiFeO3 and heterostructured BiFeO3/BiFe0.95Mn0.05O3 (5% Mn-doped BiFeO3) thin films have been prepared by a chemical deposition method. The band structures and photosensitive properties of these films have been investigated elaborately. Pure BiFeO3 films showed stable and strong response to photo illumination (open circuit potential kept −0.18 V, short circuit photocurrent density was −0.023 mA·cm−2). By Mn doping, the energy band positions shifted, resulting in a smaller band gap of BiFe0.95Mn0.05O3 layer and an internal field being built in the BiFeO3/BiFe0.95Mn0.05O3 interface. BiFeO3/BiFe0.95Mn0.05O3 and BiFe0.95Mn0.05O3 thin films demonstrated poor photo activity compared with pure BiFeO3 films, which can be explained by the fact that Mn doping brought in a large amount of defects in the BiFe0.95Mn0.05O3 layers, causing higher carrier combination and correspondingly suppressing the photo response, and this negative influence was more considerable than the positive effects provided by the band modulation. View Full-Text
Keywords: photocatalysis; photoelectrochemical; solar energy conversion; Mn-doped BiFeO3 films; heterostructure photocatalysis; photoelectrochemical; solar energy conversion; Mn-doped BiFeO3 films; heterostructure

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Xu, H.-M.; Wang, H.; Shi, J.; Lin, Y.; Nan, C. Photoelectrochemical Performance Observed in Mn-Doped BiFeO3 Heterostructured Thin Films. Nanomaterials 2016, 6, 215.

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