Issue 1, 2023

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
21 Jun 2022
Accepted
28 Nov 2022
First published
09 Dec 2022

J. Mater. Chem. C, 2023,11, 223-234

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

Z. Siddique, J. L. Payne, M. T. Sajjad, N. Mica, D. B. Cordes, A. M. Z. Slawin, I. D. W. Samuel, A. Iqbal and J. T. S. Irvine, J. Mater. Chem. C, 2023, 11, 223 DOI: 10.1039/D2TC02601E

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