30 August 2021 to 3 September 2021
University of Innsbruck
Europe/Zurich timezone

【212】Investigations of polarons in hematite $α-Fe_2O_3(1\overline{1}02)$ by means of nc-AFM and KMC

31 Aug 2021, 16:45
15m
Room C

Room C

Talk Surfaces, Interfaces and Thin Films Surfaces, Interfaces and Thin Films

Speaker

Dr Jesús Redondo (Faculty of Mathematics and Physics, Charles University)

Description

Polarons strongly influence the catalytic activity of transition metal oxides. The study of polaron formation and dynamics is fundamental to understanding the actual mechanisms and yields of catalytic reactions in these materials. A new method for the investigation of electron and hole polarons is demonstrated. Charge carriers are injected with the AFM tip into natural and Ti-doped $α-Fe_2O_3(1\overline{1}02)$. These carriers form a cloud of trapped charges, which expands due to electrostatically and thermally activated polaron hopping. Annealing of the sample and characterization by KPFM provides information on polaron dynamics; these results are compared to KMC simulations and the dependence of the hopping activation energy on the Ti doping is shown.

Primary authors

Dr Jesús Redondo (Faculty of Mathematics and Physics, Charles University) Dr Pavel Kocán (Faculty of Mathematics and Physics, Charles University) Dr Giada Franceschi (TU Wien, Institute of Applied Physics) Dr Igor Sokolović (TU Wien, Institute of Applied Physics) Dr Florian Kraushofer (TU Wien, Institute of Applied Physics) Michele Riva (TU Wien, Institute of Applied Physics) Gareth S. Parkinson (TU Wien, Institute of Applied Physics) Ulrike Diebold (TU Wien, Institute of Applied Physics) Martin Setvin (Faculty of Mathematics and Physics, Charles University)

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