Surface and Optical Properties of Phase-Pure Silver Iodobismuthate Nanocrystals
Résumé
The study of surface defects is one of the forefronts of halide perovskite research. At the nanoscale regime, where the surface-to-volume ratio is high, the surface plays a key role in determining the electronic properties of perovskites. Perovskite-inspired silver iodobismuthates are promising photovoltaic absorbers. Herein, we demonstrate the colloidal synthesis of phase pure and high crystalline AgBiI4 nanocrystals (NCs). The surface-sensitive spectroscopic techniques reveal the rich surface features of the NCs that enable their impressive long-term and thermal stabilities. Notably, the surface termination and its passivation effects on the electronic properties of AgBiI4 are investigated. Our atomistic simulations suggest that a bismuth iodide-rich surface, as in the case of AgBiI4 NCs, does not introduce surface trap states within the band gap region of AgBiI4, unlike a silver iodide-rich surface. These findings may encourage the investigation of surfaces of other lead-free perovskite-inspired materials
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