White CsPbBr3: Characterizing the One‐Dimensional Cesium Lead Bromide Polymorph

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 (δ‐CsPbBr3) synthesized through a simple anion‐exchange reaction, wherein distorted edge‐sharing PbBr6 octahedra form...

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Bibliographic Details
Published in:Helvetica chimica acta 2020-07, Vol.103 (7), p.n/a
Main Authors: Aebli, Marcel, Benin, Bogdan M., McCall, Kyle M., Morad, Viktoriia, Thöny, Debora, Grützmacher, Hansjörg, Kovalenko, Maksym V.
Format: Article
Language:English
Subjects:
Absorption
anion exchange
Anion exchanging
Broadband
Cesium
Cesium 133
Cesium ions
Cesium isotopes
DFT
DSC
Emission analysis
Excitons
Heat exchange
Lead
Lead compounds
lead halide
Lead isotopes
Luminescence
Metal halides
NMR
NMR spectroscopy
Nuclear magnetic resonance
Optoelectronics
perovskite
Perovskites
Photoluminescence
Photons
Photovoltaic cells
Raman spectroscopy
Recombination
Room temperature
Solar cells
solid-state structures
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Summary: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 (δ‐CsPbBr3) synthesized through a simple anion‐exchange reaction, wherein distorted edge‐sharing PbBr6 octahedra form 1D chains isolated by Cs ions. δ‐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 (γ‐CsPbBr3) upon heating to above 151 °C. The indirect bandgap was determined by absorption measurements and calculation to be 2.9 eV. δ‐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 the recombination of self‐trapped excitons. This study emphasizes that the metastable δ‐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.
ISSN:0018-019X
1522-2675
DOI:10.1002/hlca.202000080