AI Article Synopsis
- The family of 2D Ruddlesden-Popper perovskites is gaining significant attention for their potential in energy harvesting and light emission technologies.
- Despite being known for decades, recent studies highlight that their optical properties are influenced by exciton-phonon coupling, largely affected by the organic spacers in the material.
- This research reveals that the complex absorption spectra of a specific 2D perovskite (PEA)(CHNH)PbI are linked to a vibronic progression in excitonic transitions and a notable coupling to a high-energy phonon mode, likely stemming from the organic spacer's torsional motion.
Article Abstract
The family of 2D Ruddlesden-Popper perovskites is currently attracting great interest of the scientific community as highly promising materials for energy harvesting and light emission applications. Despite the fact that these materials are known for decades, only recently has it become apparent that their optical properties are driven by the exciton-phonon coupling, which is controlled by the organic spacers. However, the detailed mechanism of this coupling, which gives rise to complex absorption and emission spectra, is the subject of ongoing controversy. In this work we show that the particularly rich, absorption spectra of (PEA)(CHNH)PbI (where PEA stands for phenylethylammonium and = 1, 2, 3), are related to a vibronic progression of excitonic transition. In contrast to other two-dimensional perovskites, we observe a coupling to a high-energy (40 meV) phonon mode probably related to the torsional motion of the NH head of the organic spacer.
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| http://dx.doi.org/10.1021/acs.jpclett.0c01714 | DOI Listing |
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