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

Zumaira Siddique, Julia L. Payne, Muhammad Tariq Sajjad, Natalie Mica, David B. Cordes, Alexandra M. Z. Slawin, Ifor D. W. Samuel, Azhar Iqbal*, John T. S. Irvine*

*Corresponding author for this work

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Abstract

Toxicity and regulatory concerns over the use of (CH3NH3)PbI3 in photovoltaic devices have resulted in significant interest in lead-free, organic–inorganic metal halides with excellent light absorbing properties and stability. Here we report the synthesis of three new lead-free bismuth halides which accommodate the symmetric conjugated p-phenylenediammonium cation (PPD = (H3NC6H4NH3)2+) in the structures. These are (PPD)BiI5, (PPD)[BiBr4]2·2H2O and (PPD)2BiCl7·H2O. We also synthesized β-(PPD)2Bi2I10. The band gap of the iodide, β-(PPD)2Bi2I10 (1.83 eV) is lower than that of the bromide, (PPD)[BiBr4]2·2H2O (2.64 eV) and chloride, (PPD)2BiCl7·H2O (2.93 eV). Photophysical studies show that β-(PPD)2Bi2I10 has the longest average charge carrier lifetime (>1 μs) of the materials studied here, of the same order of magnitude as that of (CH3NH3)PbI3 and has a low band gap. This suggests that β-(PPD)2Bi2I10 may be a promising candidate for use in lead-free photovoltaic devices.
Original languageEnglish
Pages (from-to)223-234
Number of pages12
JournalJournal of Materials Chemistry C
Volume11
Issue number1
Early online date9 Dec 2022
DOIs
Publication statusPublished - 7 Jan 2023

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