Regensburg 2016 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 7: Focus Session: Ferroic Domain Walls I

DF 7.8: Vortrag

Dienstag, 8. März 2016, 12:40–13:00, H25

Tools in study of abnormal photovoltaic effects at domain walls — Mingmin Yang and •Marin Alexe — University of Warwick, Department of Physics, CV4 7AL, Coventry, UK

In the recent past, the field of anomalous photovoltaic effect in non-centrosymmetric perovskite ferroelectric oxides has been revitalized by the reports of photovoltaic effect (PVE) in BiFeO3 (BFO). The microscopic origins of this effect are still under debate. Initial investigations on BFO films assumed that the PVE in BFO is primarily due to the presence of a potential step at the ferroelectric domain walls (DWs). In order to study the PV effect at DWs we need to use characterisation methods that would deliver information at the same characteristic length as DWs. We have developed local photoelectric measurement such as photo-induced transient spectroscopy (PITS) which bring valuable data regarding generation and recombination of the photo-excited carriers. We will present in detail PITS-SPM and data regarding generation and recombination speed at DWs in BFO.