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Switchable Charge‐Transfer in the Photoelectrochemical Energy‐Conversion Process of Ferroelectric BiFeO 3 Photoelectrodes
Author(s) -
Cao Dawei,
Wang Zhijie,
Wen Liaoyong,
Mi Yan,
Lei Yong
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201406044
Subject(s) - photocurrent , poling , ferroelectricity , materials science , semiconductor , optoelectronics , excited state , photoelectrochemistry , biasing , voltage , electrode , nanotechnology , chemistry , electrochemistry , atomic physics , electrical engineering , physics , dielectric , engineering
Instead of conventional semiconductor photoelectrodes, herein, we focus on BiFeO 3 ferroelectric photoelectrodes to break the limits imposed by common semiconductors. As a result of their prominent ferroelectric properties, the photoelectrodes are able to tune the transfer of photo‐excited charges generated either in BiFeO 3 or the surface modifiers by manipulating the poling conditions of the ferroelectric domains. At 0 V vs Ag/AgCl, the photocurrent could be switched from 0 μA cm −2 to 10 μA cm −2 and the open‐circuit potential changes from 33 mV to 440 mV, when the poling bias of pretreatment is manipulated from −8 V to +8 V. Additionally, the pronounced photocurrent from charge injection of the excited surface modifiers could be quenched by switching the poling bias from +8 V to −8 V.