Redondo, Jesus and Reticcioli, Michele and Gabriel, Vit and Wrana, Dominik and Ellinger, Florian and Riva, Michele and Franceschi, Giada and Rheinfrank, Erik and Sokolovic, Igor and Jakub, Zdenek and Kraushofer, Florian and Alexander, Aji and Belas, Eduard and Patera, Laerte L. and Repp, Jascha and Schmid, Michael and Diebold, Ulrike and Parkinson, Gareth S. and Franchini, Cesare and Kocan, Pavel and Setvin, Martin (2024) Real-space investigation of polarons in hematite Fe2O3. SCIENCE ADVANCES, 10 (44): eadp7833. ISSN 2375-2548,
Full text not available from this repository. (Request a copy)Abstract
In polarizable materials, electronic charge carriers interact with the surrounding ions, leading to quasiparticle behavior. The resulting polarons play a central role in many materials properties including electrical transport, interaction with light, surface reactivity, and magnetoresistance, and polarons are typically investigated indirectly through these macroscopic characteristics. Here, noncontact atomic force microscopy (nc-AFM) is used to directly image polarons in Fe2O3 at the single quasiparticle limit. A combination of Kelvin probe force microscopy (KPFM) and kinetic Monte Carlo (KMC) simulations shows that the mobility of electron polarons can be markedly increased by Ti doping. Density functional theory (DFT) calculations indicate that a transition from polaronic to metastable free-carrier states can play a key role in migration of electron polarons. In contrast, hole polarons are significantly less mobile, and their hopping is hampered further by trapping centers.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHARGE-TRANSPORT; SEMICONDUCTORS; ALPHA-FE2O3; MECHANISM; DIFFUSION; STATE; TIO2; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Jan 2026 07:59 |
| Last Modified: | 14 Jan 2026 07:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/65321 |
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