Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.031
Publication date: 16th December 2024
The Achilles heel of Sn-based perovskites is their susceptibility to Sn2+ to Sn4+ oxidation. Chemical instability becomes more severe in nanocrystal (NC) form due to the large surface area, while NC durability deteriorates further in the solid state because of higher ligand loss and greater exposure to humidity and oxygen. Recently, an optimized synthetic route was developed, allowing the production of robust and monodisperse three-dimensional (3D) CsSnI3 nanocrystals (NCs) that coexist with residual amounts of 2D Ruddlesden-Popper nanosheets (NSs) [1].
Herein, the exciton structure and stimulated emission properties of thin films of the tin iodide perovskite nanostructures are discussed. Incorporation of the CsSnI3 NCs in polystyrene matrixes, increases substantially the optical stability in the oxygen-free environment of the spectroscopic measurements. At ambient temperature, strong NC and weak NS excitonic bands in the red and yellow spectral range, respectively are observed and monitored by transient absorption and photoluminescence (PL). The transient decay of the bleaching of the ground exciton band and the NC luminescence is found to occur at timescales of the order of 0.1 and 1 ns respectively, being accelerated compared to the respective dynamics of lead-based perovskite NC films, most probably due to non-radiative recombination at surface defects. At cryogenic temperatures, two emissive species of the NC structures are observed, identified as bound and free excitonic complexes. The relative population of the two species depends on temperature, aging and surface passivation. Photoexcitation of the CsSnI3 NCs films with nanosecond pulses activates amplified spontaneous emission (ASE) at temperatures as high as 150 K. The ASE threshold and net modal gain is optimized via the fabrication of NC-polymer multilayer structures, allowing the observation of room temperature ASE.
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
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