Abstract
We report the synthesis and characterization of nanocrystals of a novel fully inorganic lead-free zero-dimensional perovskite, Cs4SnBr6. Samples are made of crystals with an average size of ∼20 nm with green emission centered around 530 nm. Interestingly, both colloidal suspensions and thin films show an enhanced air stability with respect to that of any other previous tin-based nanocrystalline system, with emission persisting for tens of hours under laboratory air.
Highlights
We report the synthesis and characterization of nanocrystals of a novel fully inorganic lead-free zero-dimensional perovskite, Cs4SnBr6
All-inorganic perovskite nanocrystals (NCs) represent a current hot topic of extensive investigation for their highly versatile optoelectronic properties such as, among others, very high photoluminescence (PL) quantum yields, tunable PL across the entire visible spectra range, and a narrow full width at half-maximum of emission.[1−8] A very rich literature about this class of nanomaterials has been published following the key paper of Protesescu et al reporting the synthesis of CsPbX3 NCs by means of a standard hot-injection method.[9]
Materials, where the octahedra are completely isolated by cation bridges and charge carriers are localized within the metal halide component, is a perfect test-bed sample for monitoring the structural evolution of nanocrystalline systems from the three-dimensional (3D) network to 0D molecular-like systems
Summary
Ciftci − Gazi University, Ankara, Turkey Valentin I. E. Queloz − École Polytechnique Fedeŕ ale de Lausanne (EPFL), Sion, Switzerland Mohammad Khaja Nazeeruddin − École Polytechnique. Giulia Grancini − University of Pavia and INSTM, Pavia, Italy; orcid.org/0000-0001-8704-4222.
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