Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.078
Publication date: 7th February 2022
Despite the increased efforts to replace the Pb in the lead halide perovskites-based solar cells with Sn analogs materials, in the nanocrystal field, limited progress is reported. The intrinsic chemical instability of the Sn2+ hinders a clear understanding of the origin of the chemical instability and poor optical performance.
Here we present the Sn halide perovskites nanomaterials with tunable size and dimensionality (3D - Sn halide perovskites: ASnX3, A=Cs+, FA+, X=I-, Br- and 2D - Ruddlesden-Popper (R-NH3+)2Csn-1SnnX3n+1), and characteristic optical properties. The formation mechanism of the perovskite nanocrystals is based on the pre-formation of the 1D chained of [SnI6]2- octahedra. Similar to Pb-based perovskites, the stability of the NCs is increased for 10 nm particles while the optical performance remains inferior to the Pb cousins.
The relation between the kinetic parameters during the synthesis processes and the chemical and optical stability of the obtained 3D and 2D perovskites nanostructures will be discussed.
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