title: Switchable charge-transfer in the photoelectrochemical energy-conversion process of ferroelectric BiFeO₃ photoelectrodes.
abstract: Instead of conventional semiconductor photoelectrodes, herein, we focus on BiFeO3 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 BiFeO3 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.
authors.affiliation: Institut für Physik & IMN MacroNano@(ZIK), Technische Universität Ilmenau, 98693 Ilmenau (Germany).
authors.forename: Dawei
authors.initials: D
authors.lastname: Cao
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Wang
authors.lastname: Nasori
authors.forename: Liaoyong
authors.initials: L
authors.lastname: Wen
authors.forename: Yan
authors.initials: Y
authors.lastname: Mi
authors.forename: Yong
authors.initials: Y
authors.lastname: Lei
keywords: BiFeO3; charge transfer; photoelectrodes; polarization; tunability