Is there a polaron signature in Angle-Resolved Photoemission of CsPbBr3?
- The formation of large polarons has been proposed as reason for the high defect tolerance, low mobility, low charge carrier trapping, and low nonradiative recombination rates of lead halide perovskites. Recently, direct evidence for large-polaron formation has been reported from a 50% effective mass enhancement in angle-resolved photoemission of CsPbBr3 over theory for the orthorhombic structure. We present in-depth band dispersion measurements of CsPbBr3 and GW calculations, which lead to similar effective masses at the valence band maximum of 0.203 1 0.016 m0 in experiment and 0.226 m0 in orthorhombic theory. We argue that the effective mass can be explained solely on the basis of electron-electron correlation and largepolaron formation cannot be concluded from photoemission data.
| Author details: | Maryam SajediORCiDGND, Maxim KrivenkovORCiD, Dmitry MarchenkoORCiD, Jaime Sanchez-BarrigaORCiD, Anoop K. ChandranORCiD, Andrei VarykhalovORCiD, Emile D. L. RienksORCiD, Irene AguileraORCiD, Stefan BlügelORCiD, Oliver RaderORCiD |
|---|---|
| DOI: | https://doi.org/10.1103/PhysRevLett.128.176405 |
| ISSN: | 0031-9007 |
| ISSN: | 1079-7114 |
| Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/35570464 |
| Title of parent work (English): | Physical review letters |
| Publisher: | American Physical Society |
| Place of publishing: | College Park |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2022/04/29 |
| Publication year: | 2022 |
| Release date: | 2024/06/10 |
| Volume: | 128 |
| Issue: | 17 |
| Article number: | 176405 |
| Number of pages: | 7 |
| Funding institution: | Impuls-und Vernetzungsfonds der Helmholtz-Gemeinschaft [HRSF-0067] |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Peer review: | Referiert |
