Improved charge separation efficiency of hematite photoanodes by coating an ultrathin p-type LaFeO3 overlayer

Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite ( -Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performanc...

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Bibliographic Details
Published in:Nanotechnology 2017-09, Vol.28 (39), p.394003-394003
Main Authors: Fang, Tao, Guo, Yongsheng, Cai, Songhua, Zhang, Ningsi, Hu, Yingfei, Zhang, Shiying, Li, Zhaosheng, Zou, Zhigang
Format: Article
Language:English
Subjects:
charge separation efficiency
hematite
LaFeO
photoanode
water splitting
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Summary:Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite ( -Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO3 overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe2O3/LaFeO3 n-p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/aa7fda