SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Poster Session V: Electron-driven processes at surfaces and interfaces
O 63.3: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Investigations of polarons in hematite α−Fe2O3(1102) by means of nC-AFM and KMC — •Jesús Redondo1, Pavel Kocán1, Giada Franceschi2, Florian Kraushofer2, Michele Riva2, Gareth S. Parkinson2, Michael Schmid2, Ulrike Diebold2, Martin Setvin1,2, and Igor Sokolović2 — 1Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — 2Institute of Applied Physics, TU Wien, Austria
Polarons are known to strongly influence the catalytic activity and the electronic, magnetic and structural properties of transition metal oxides and halide perovskites. 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 atomic force microscope (AFM) tip into the α−Fe2O3(1102) surface. The injected charges form a cloud of charged particles trapped in the lattice. This cloud expands due to electrostatic interactions and thermally activated polaron hopping. Controlled annealing the sample and characterization by Kelvin probe force microscopy (KPFM) provides information on polaron dynamics that is compared to kinetic Monte Carlo (KMC) simulations.
The work was supported by projects GACR 20-21727X and GAUK Primus/20/SCI/009