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We synthesized and characterized methylammonium (MA) mixed tri‐halide tin perovskites (MASnIBr2−xClx) for carbon‐based mesoscopic solar cells free of lead and hole‐transporting layers. Varied SnCl2/SnBr2 ratios yielded tin perovskites with three halides (I, Br, and Cl) co‐crystallized inside the tin‐perovskite. When the SnCl2 proportion was ≥50 % (x≥1), phase separation occurred to give MASnI3−yBr...
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