Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.298
Publication date: 18th December 2023
Synthesis of tin (Sn) halide perovskite nanostructures has been challenging as the high surface to volume ratio promotes fast Sn2+ to Sn4+ oxidation and facilitates the production of polymorphs with different optoelectronic properties. Recently, an optimized synthetic route was developed, allowing the production of robust and monodisperse three-dimensional (3D) CsSnI3 nanocrystals (NCs) with sizes in the 6 to 10 nm range [1]. The synthetic process produces also small amounts of two-dimensional (2D) (R-NH3+)2SnI4, Ruddlesden–Popper nanosheets, that form stable colloidal mixtures with the 3D NCs [1].
Herein, the spontaneous and stimulated emission properties of thin films of the coexisting 3D-2D nanostructures are discussed. The films emission is dominated by the NC component, as transient spectroscopy indicates the presence of efficient energy funneling from the nanosheets to the nanocrystals. At cryogenic temperatures, two CsSnI3 NC luminescence species exist, identified as surface bound excitons and free excitons. The relative population of the two species depends on temperature, aging, thermal cycling and surface passivation.
Upon intense photoexcitation with nanosecond pulses, stable amplified spontaneous emission (ASE) is observed from the CsSnI3 NCs at temperature up to 150K. Fabrication of NC-polymer multilayer structures allows the reduction of the ASE threshold and the observation of ASE at temperatures approaching 300 K.
The work was supported by the project INFRASTRUCTURE/1216/0004, co-financed by the European Regional Development Fund and the Republic of Cyprus through the Research & Innovation Foundation of Cyprus
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