Polaron vibronic progression shapes the optical response of 2D perovskites

Mateusz Dyksik

doi:10.1117/12.3003971

9 March 2024 Polaron vibronic progression shapes the optical response of 2D perovskites

Mateusz Dyksik

Proceedings Volume PC12881, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIII; PC128810E (2024) https://doi.org/10.1117/12.3003971
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

The optical response of 2D layered perovskites is composed of multiple equally-spaced spectral features, often interpreted as phonon replicas, separated by an energy Δ ≃ 15−40 meV, depending upon the compound. We show that the characteristic energy spacing, seen in both absorption and emission, is correlated with a substantial scattering response above ≃200 cm−1 (≃25 meV) observed in resonant Raman. This peculiar high-frequency signal, which dominates both Stokes and anti-Stokes regions of the scattering spectra, possess the characteristic spectral fingerprints of polarons. Notably, its spectral position is shifted away from the Rayleigh line, with a tail on the high energy side. The internal structure of the polaron consists of a series of equidistant signals separated by 25-32 cm−1 (3-4 meV), depending upon the compound, forming a polaron vibronic progression. The observed progression is characterized by a large Huang-Rhys factor (S >6) for all of the 2D layered perovskites investigated here, indicative of a strong charge carrier – lattice coupling.

Conference Presentation

Citation Download Citation

Mateusz Dyksik "Polaron vibronic progression shapes the optical response of 2D perovskites", Proc. SPIE PC12881, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIII, PC128810E (9 March 2024); https://doi.org/10.1117/12.3003971

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