Abstract

Metal halide perovskite nanostructures have attracted considerable attention in both fundamental and applied research, owing to their extraordinary optoelectronic properties such as emission tunability across the visible range, high photoluminescence quantum yield with narrow full-width at half-maximum (FWHM ~ 20 nm) and high defect tolerance [1-3]. Recently, new perovskite structures such as nanocubes and superlattices have shown a novel type of emission called superfluorescence, which is not present in other low-dimensional perovskites like nanowires [4-6]. Superfluorescence can be promising to achieve low-threshold lasing, however, the Auger recombination in such systems has not been investigated. Here, we show a new route for the in-situ formation of perovskite nanocubes with edge lengths below 100 nm during spin coating from different halide compositions. Further, a solid-gas route to achieve core-shell perovskite nanocubes through a gas-solid halide exchange route will be presented. In particular, the core C_sPbBr₃ nanocubes were synthesized with a facile solution-based technique, where a perovskite solution containing cesium and lead bromide precursors was spin coated on selected substrate.

© 2023 IEEE