Abstract
Perovskite nanocrystals (PNCs) have witnessed unprecedented development in optoelectronic fields over the past few years. However, their intrinsic ionic structural instability still dramatically hinders their practical applications. Reliably improving the stability of PNCs while retaining their colloidal dispersity remains a grand challenge. Herein, we report a new strategy whereby CsPbBr3 nanoparticles are grown in situ in an entropy ligand-functionalized SiO2 nanoreactor. Consequently, the as-obtained CsPbBr3@SiO2 NPs show outstanding stability and colloidal dispersity in various non-polar solvents and have good solution processability, which are unattainable by conventional template-assisted methods.
Highlights
Since the pioneering work reported on the synthesis of cesium lead halide (CsPbX3, where X = Cl, Br, I) perovskite nanocrystals (PNCs) by Kovalenko et al in 2015 [1], CsPbX3 PNCs have shown outstanding achievement in optoelectronic fields, including light-emitting diodes (LEDs), lasers, photodetectors, and solar cells [2,3,4,5]
By combining two distinguishable chain-length n-alkanoate, the solubility of the resulting colloidal nanocrystals can increase up to about six orders of magnitude, because the C–C σ-bond intramolecular entropy in the solution substantially reduces the dissolution enthalpy and facilitates its dispersion. Inspired by such entropy–enthalpy competition, we introduced a modified template-assisted strategy with entropy ligands for the synthesis of CsPbBr3 nanocomposites, in which hollow siliceous nanospheres (HSNSs) templates with a high entropy surface are constructed through grafting mixed ligands (ML) with distinguishable long-chain ligands and short-chain bendritic ligands
TEM images confirm that the as-synthesized HSNSs-ML is an exclusively hollow structure with uniform particle size distribution
Summary
Since the pioneering work reported on the synthesis of cesium lead halide (CsPbX3, where X = Cl, Br, I) perovskite nanocrystals (PNCs) by Kovalenko et al in 2015 [1], CsPbX3 PNCs have shown outstanding achievement in optoelectronic fields, including light-emitting diodes (LEDs), lasers, photodetectors, and solar cells [2,3,4,5]. These triumphant applications of PNCs can be attributed to their extraordinary optical properties including high photoluminescence quantum yield (PLQY), narrow spectra, short radiative lifetimes, and tunable band-edge emission, etc. It remains highly desirable for the PNCs to overcome the stability issues while maintaining excellent solution processability at the nanoscale range
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