Proceedings of Online Meetup - Beyond Lead Halide Perovskites: Syntheses and Applications of Metal Halide Semiconductors (MABP)
Publication date: 23rd April 2020
Inorganic lead halide perovskites have gained immense scientific interest for optoelectronic applications. In this work we present a one-dimensional polymorph of cesium lead bromide (d-CsPbBr3) synthesized through a simple anion-exchange reaction, wherein distorted edge-sharing PbBr6 octahedra form 1D chains isolated by Cs ions. d-CsPbBr3 was characterized by Raman spectroscopy, X-ray diffraction, 207Pb and 133Cs solid-state NMR, and by optical emission and absorption spectroscopies. This non-perovskite material irreversibly transforms into the well-known three-dimensional perovskite phase (y-CsPbBr3) upon heating to above 151 °C. The indirect bandgap was determined by absorption measurements and calculation to be 2.9 eV. d-CsPbBr3 exhibits broadband yellow photoluminescence with a quantum yield of 3.2% ±0.2% at room temperature and 95% ±5% at 77 K, and this emission is attributed to a recombination of self-trapped excitons. This study emphasizes that the metastable d-CsPbBr3 may be a persistent, concomitant phase in Cs-Pb-Br-containing materials systems, such as those used in solar cells and LEDs, and it showcases the characterization tools used for its detection.
This work was financial supported by the European Union European Union through Horizon 2020 (ERC Consolidator Grant SCALE-HALO, grant agreement No. [819740]). The authors acknowledge the support of the Scientific Center for Optical and Electron Microscopy (ScopeM) of the Swiss Federal Institute of Technology (ETHZ) for the Raman spectroscopy measurements. The authors thank Debora Thöny for helping with DSC and Yevhen Shynkarenko for the QY measurements.
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