Publication date: 8th July 2026
Metal halide perovskites have transformed the landscape of solution-processable semiconductors, especially for photovoltaics, light emission, and radiation detection. Their success arises from an unusual combination of strong optical absorption, long carrier lifetimes, defect tolerance, compositional flexibility, and low-temperature processability. However, the same structural softness and compositional tunability that make perovskites powerful also introduce persistent challenges, including phase instability, ion migration, moisture sensitivity, and light-induced halide segregation in wide-bandgap mixed-halide absorbers.
In this presentation, we will discuss how the broader structural chemistry of perovskite-derived materials opens new opportunities beyond the conventional corner-sharing ABX₃ perovskite framework. Particular emphasis will be placed on perovskitoids, a structurally related class of metal halides that retain some corner-sharing octahedral connectivity but also incorporate edge- or face-sharing octahedra.
This mixed connectivity provides an additional design parameter, beyond composition and dimensionality, for controlling bandgap, charge transport, luminescence, and stability. Compared with conventional perovskites, perovskitoids offer a much broader structural landscape and can access bandgaps that would otherwise require halide alloying or dimensional reduction. In favorable cases, this enables wide-bandgap pure-iodide absorbers with improved photostability, avoiding the halide-segregation problem that limits mixed-halide perovskites in tandem solar cells.
[1] Kanatzidis, M. G. Acc. Chem. Res. 2025, 58, 14, 2243–2254.
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