Publication date: 21st July 2025
Two-dimensional perovskite materials have attracted increasing interest as active materials in photonic and optoelectronic applications, primarily due to their intriguing optical and electronic properties. Among their most striking properties is pronounced exciton-phonon coupling, which is believed to be relevant to a variety of key (opto)electronic parameters, including carrier mobility, photo- and electroluminescence, and exciton binding energies. However, the interplay between the structure of the perovskite and electron-phonon coupling effects remains poorly understood; understanding the relationship between these effects is therefore essential to the continued development of high-performance perovskite materials.
To this end, we employ advanced optical methods to investigate a series of 2D Ruddleston-Popper perovskites, employing derivatives of the chiral methylbenzylammonium (MBA) molecule as organic spacer ligands. By fine-tuning the structure of the MBA derivatives—leveraging both substitution and stereochemical effects—we demonstrate control over the strength of electron-phonon coupling. We link these observations to the mechanical properties of the inorganic lattice, which are modulated by the organic spacer ligands.
Our results reveal a clear pathway to control the dynamics of the inorganic lattice of 2D perovskites through molecular design of the organic spacer ligand, and further highlight the importance of stereochemical and enantiomeric effects in controlling electron-phonon coupling in these materials.
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