Microscopic Picture of Electron-Phonon Interaction in Two-Dimensional Halide Perovskites
Journal article, 2020
Perovskites have attracted much attention due to their remarkable optical properties. While it is well established that excitons dominate their optical response, the impact of higher excitonic states and formation of phonon sidebands in optical spectra still need to be better understood. Here, we perform a theoretical study of excitonic properties of monolayered hybrid organic perovskites - supported by temperature-dependent photoluminescence measurements. Solving the Wannier equation, we obtain microscopic access to the Rydberg-like series of excitonic states including their wave functions and binding energies. Exploiting the generalized Elliot formula, we calculate the photoluminescence spectra demonstrating a pronounced contribution of a phonon sideband for temperatures up to 50 K, in agreement with experimental measurements. Finally, we predict temperature-dependent line widths of the three energetically lowest excitonic transitions and identify the underlying phonon-driven scattering processes.
Author
David Feldstein
Polytechnic University of Catalonia
Chalmers, Physics, Condensed Matter and Materials Theory
Raul Perea Causin
Chalmers, Physics, Condensed Matter and Materials Theory
Shuli Wang
Paul Sabatier University
Mateusz Dyksik
Paul Sabatier University
Wrocław University of Science and Technology
Kenji Watanabe
National Institute for Materials Science (NIMS)
Takashi Taniguchi
National Institute for Materials Science (NIMS)
Paulina Plochocka
Wrocław University of Science and Technology
Paul Sabatier University
Ermin Malic
Chalmers, Physics, Condensed Matter Theory
Journal of Physical Chemistry Letters
1948-7185 (eISSN)
Vol. 11 23 9975-9982Subject Categories
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1021/acs.jpclett.0c02661
PubMed
33180499