Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.313
Publication date: 18th December 2023
Halide double perovskites, such as Cs2AgBiX6 (X = Br, Cl), are emerging semiconductors for optoelectronic applications due to their lower toxicity.[1] Although exhibiting an indirect bandgap, colloidal Cs2AgBiCl6 nanocrystals (NCs) show bright dual-peak photoluminescence spectra.[2] However, the origin of both emission bands is still under debate. Here, we show that silver (Ag) plays a crucial role in both emissions of these double perovskite NCs. The trapping of holes in Ag vacancies leads to a spatial localization of the hole wave function on the scale of the lattice constant. This provides k-values for the hole wave function at all boundaries of the Brillouin zone, resulting in localized bound excitons with a red emission at 650 nm with an activated temperature dependence. The blue emission (425 nm) stems from the lecithin ligands of the NCs spectrally overlapping with the plasmon resonance of the surface-attached Ag nanoclusters. This work is of importance for the surface chemistry of Cs2AgBiCl6 double perovskites and their optoelectronic applications.
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