Local Structure of Multinary Hybrid Lead Halide Perovskites Investigated by Nuclear Quadrupole Resonance Spectroscopy
نویسندگان
چکیده
Hybrid organic–inorganic lead halide perovskites have emerged as popular low-cost, solution-processable semiconductors owing to their outstanding optical and electronic characteristics. The structural characterization of these soft solids has proven challenging due increased dynamics static disorder. Nuclear quadrupole resonance (NQR) may serve a powerful tool for probing the local structure anions in bulk nanocrystalline forms perovskites. Here, we characterize atomic mixed-cation mixed-anion solid solutions derived from cubic formamidinium iodide (FAPbI3), typically used photovoltaics photodetectors, using 127I NQR. Even minute quantities Cs ions on FA sites or Br I multitude different environments, readily seen by NQR spectroscopy. At 10% Cs, signatures Cs-ion clustering arise, pointing onset phase separation, observed diffraction methods at higher contents. On contrary, Br-ion distribution appears homogeneous across all Br-to-I ratios. We anticipate that studies will be indispensable understanding atomistic diverse multinary metal halides, also forms—from single crystals thin films nanocrystals.
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ژورنال
عنوان ژورنال: Chemistry of Materials
سال: 2021
ISSN: ['1520-5002', '0897-4756']
DOI: https://doi.org/10.1021/acs.chemmater.1c01945