Benzimidazolium Lead Halide Perovskites: Effects of Anion Substitution and Dimensionality on the Bandgap

Autor: Susanne T. Birkhold, Sascha Harm, Christopher M. Kutz, Julian A. Jaser, Peter Mayer, Claudia Lermer, Bettina V. Lotsch, Lukas Schmidt-Mende
Rok vydání: 2016
Předmět:
Zdroj: Zeitschrift für anorganische und allgemeine Chemie. 642:1369-1376
ISSN: 0044-2313
DOI: 10.1002/zaac.201600371
Popis: We present the synthesis and structural characterization of a series of benzimidazolium-based lead halide perovskites including (C7H7N2)(2)PbCl4, (C7H7N2)(2)PbBr4, (C7H7N2)(2)PbI4, and (C7H7N2)PbI3, which serves as a platform to investigate the change in optical properties as a function of the halide and the dimensionality of the inorganic sublattice. The structural similarity of the layered systems with A(2)MX(4) stoichiometry was verified by single-crystal X-ray diffraction and solid- state NMR spectroscopy. The optical properties were analyzed by absorption and photoluminescence (PL) measurements, confirming the decrease in bandgap when exchanging the chloride with its higher homologues Br and I. In addition, comparison of the layered compound (C7H7N2)(2)PbI4 with the known compound (C7H7N2)PbI3 reveals an increase in bandgap on going from a 2D to a dimensionally reduced 1D topology. Besides, significant differences in the PL spectra of the halides are observed, which likely are due to recombination of self-trapped excitons stabilized through lattice distortions or permanent lattice defects in the compounds featuring broad PL emission bands.
Databáze: OpenAIRE
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