Journal
PHYSICAL REVIEW MATERIALS
Volume 2, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.2.064605
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Funding
- EU Horizon 2020 via a Marie Sklodowska Curie Fellowship (Global) [705874]
- EU Horizon 2020 Research and Innovation Program [643238]
- Natural Sciences and Engineering Research Council of Canada
- Fond Quebecois pour la Recherche: Nature et Technologies
- School of Chemistry and Biochemistry
- College of Science of the Georgia Institute of Technology
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Owing to both electronic and dielectric confinement effects, two-dimensional organic-inorganic hybrid perovskites sustain strongly bound excitons at room temperature. Here, we demonstrate that there are non-negligible contributions to the excitonic correlations that are specific to the lattice structure and its polar fluctuations, both of which are controlled via the chemical nature of the organic countercation. We present a phenomenological yet quantitative framework to simulate excitonic absorption line shapes in single-layer organic-inorganic hybrid perovskites, based on the two-dimensional Wannier formalism. We include four distinct excitonic states separated by 35 +/- 5 meV, and additional vibronic progressions. Intriguingly, the associated Huang-Rhys factors and the relevant phonon energies show substantial variation with temperature and the nature of the organic cation. This points to the hybrid nature of the line shape, with a form well described by a Wannier formalism, but with signatures of strong coupling to localized vibrations, and polaronic effects perceived through excitonic correlations. Our work highlights the complexity of excitonic properties in this class of nanostructured materials.
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