Effect of Chloride Additives on Two-Dimensional Sn-based Perovskite Thin-Films
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Two-dimensional Sn-based perovskite has gained significant attention in optoelectronics due to its low toxicity, high ambient stability, and tunable bandgap. Despite considerable research on its application as channel materials for thin-film transistors, the low intrinsic mobility from bulky organic spacers that hinder charge transport still calls for our attention. In this study, we investigated the effect of chloride additives on phenethylammonium tin iodide ((PEA)2SnI4) precursor solution. Known for its high volatility, methylammonium chloride (MACl) can direct the orientation of inorganic octahedral cage layer of perovskite thin-film. We incorporated dual treatment into (PEA)2SnI4, including solvent engineering of dimethyl sulfoxide to advocate slow crystallization and use of MACl for orienting the host lattice. The dual treatment demonstrated improvement in film morphology and device performance of thin-film transistor, with an increase of triple the field-effect mobility.