Lead-free solution-processed solid-state photovoltaic devices based on formamidinium tin triiodide (FASnI 3 ) and cesium tin triiodide (CsSnI 3 ) perovskite semiconductor as the light harvester are reported. In this letter, we used solvent engineering and anti-solvent dripping method to fabricate perovskite films. SnCl 2 was used as an inhibitor of Sn 4+ in FASnI 3 precursor solution. We obtained the best films under the function of toluene or chlorobenzene in anti-solvent dripping method and monitored the oxidation of FASnI 3 films in air. We chose SnF 2 as an additive of CsSnI 3 precursor solution to prevent the oxidation of the Sn 2+ , improving the stability of CsSnI 3 . The experimental results we obtained can pave the way for lead-free tin-based perovskite solar cells (PSCs).
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Ji et al. (2017) studied this question.
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