Publication date: 15th December 2025
Low-dimensional metal halide perovskites are attracting great interest for photovoltaics and photonics. The type of B-site metal in conjunction with the organic templating cations play a crucial role to determine the properties of low dimensional perovskites.
Here we discuss how the molecular engineering of organic cations in terms of cationic head (ammonium vs imidazolium, mono- vs di-topic cations) as well as geometry, length and conjugation of the molecular core (alkyl vs aromatic derivatives) deeply affect the dimensionality, structural and optoelectronic properties of lead and tin perovskites. We employ solid state NMR (ssNMR) as a key technique to investigate the local structures at the atomic level via 1H, 13C, 15N, 119Sn and 207Pb ssNMR spectroscopy, providing clear spectral fingerprints which are characteristic of perovskites with different structural motifs, allowing the identification of their supramolecular spatial arrangements.[1] We further apply spin-lattice relaxation dynamics measurements to investigate molecular motions and structural rigidity in low-dimensional systems, and discuss their impact on the perovskites’ luminescence properties, relevant for lasing and photonic applications.[2,3]
Our studies shed light on how supramolecular engineering can guide the development of improved materials for optoelectronics.
European Union’s Horizon Europe Research Council program under Grant Agreement No. 101040681 (ERC Starting Grant SUPER).
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