Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 110: Molecular Films: Morphology, Electronics, Photovoltaics

O 110.9: Vortrag

Freitag, 24. März 2017, 12:45–13:00, GER 38

Polling Ferroelectric BiFeO3 Photoelectrodes for Switchable Charge-Transfer in the Photoelectrochemical Energy-Conversion Process — •Nasori Nasori, Dawei Cao, Zhijie Wang, Yang Xu, and Yong Lei — Prof-Schmidt-Strauße 26, 98693 Ilmenau, Institute for Physics & IMN MacroNano Ilmenau University of Technology

We report BiFeO3 ferroelectric photoelectrodes with switchable charge transfer property to break the limits imposed by conventional semiconductor. Because of the 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 canbe switched from 0 mAcm-2 to 10 mAcm-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 can be quenched by switching the polling bias from +8 V to -8 V.