Impact of built-in potential across LaFeO3/SrTiO3 heterojunctions on photocatalytic activity

被引：21
|
作者：
Nakamura, Kentarou [1 ,3 ]
Mashiko, Hisanori [1 ,3 ]
Yoshimatsu, Kohei [1 ,3 ]
Ohtomo, Akira [1 ,2 ,3 ]
机构：
[1] Tokyo Inst Technol, Dept Appl Chem, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528552, Japan
[2] Tokyo Inst Technol, Mat Res Ctr Element Strategy MCES, Yokohama, Kanagawa 2268503, Japan
[3] Tokyo Inst Technol, Dept Chem Sci & Engn, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528552, Japan
来源：
APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 21期
基金：
日本学术振兴会;
关键词：
VISIBLE-LIGHT IRRADIATION; WATER OXIDATION; HYDROGEN GENERATION; SEMICONDUCTOR; LAFEO3; PEROVSKITE; ELECTRODES; INTERFACES; HETEROINTERFACES; PHOTOELECTRODES;
D O I：
10.1063/1.4952736
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Polar-nonpolar interfaces between insulating LaFeO3 (LFO) and semiconducting SrTiO3 (STO) were investigated to elucidate effects of built-in potential on photocarrier dynamics during water oxidation reactions. The LFO films were grown on the TiO2- and SrO-terminated (001) Nb-doped STO substrates by using pulsed-laser deposition. The photocurrent-voltage curves varied depending on the interface termination. Potential profiles across the interface were established from these curves as well as capacitance-voltage curves. The presence of a depletion (accumulation) region near the SrO-(TiO2-) terminated interface facilitates (suppresses) the extraction of photocarriers generated in STO. On the other hand, the difference in the built-in potential in LFO barely reflects the magnitude of the photocurrent. Published by AIP Publishing.
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页数：5
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