Synthesis and optical characterization of lead-free phenylenediammonium bismuth halide perovskites: a long charge carrier lifetime in phenylenediammonium bismuth iodide

Here we report the synthesis and properties of some lead-free organic bismuth halides. β-(PPD) 2 Bi 2 I 10 has the longest average charge carrier lifetime (>1 μs) of the materials studied here, of the same order of magnitude as that of (CH 3 NH 3 )PbI 3 and has a low band gap.