Proceedings of Online Meetup - Beyond Lead Halide Perovskites: Syntheses and Applications of Metal Halide Semiconductors (MABP)
Publication date: 23rd April 2020
Lead halide perovskites boosted the solar cells efficiency in these last few years, up to 25.5%. Despite the outstanding optical and electrical properties, the most common organic-inorganic lead iodide perovskite materials has two main drawbacks, the stability and the toxicity of lead. The most obvious alternative is the replacement of the lead with the tin, in particular in the full inorganic CsSnI3. However the Sn (2+) easily oxidized in environmental conditions to the higher oxidation states (4+). After the oxidation a double perovskite Cs2SnI6 is formed, more stable than the no-oxidized counterpart. It has been used as hole transporting materials, as nanowires or quantum dots. Here Cs2SnI6 has been obtained by the degradation and reconstruction of the co-evaporated CsSnI3 or by precipitation in solution. The optical properties of the Cs2SnI6 are studied in depth and compared with the most common methylammonium lead iodide perovskite. The results highlight the potential of this material, not only regarding the stability, but also from the optical point of view.
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