Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 24, Issue 18, Pages 10944-10951Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cp00546h
Keywords
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Funding
- DFG [SCHE1905/8-1, 424708673, SCHE1905/9-1]
- Carl Zeiss Stiftung (Forschungsstrukturkonzept Interdisziplinares nanoBCP-Lab'')
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This study shows that the decomposition of caesium lead halide perovskite nanocrystals under X-ray illumination is influenced by the surface ligand. It is found that surface functionalization with a metal porphyrin derivative can slow down the decomposition and alter the pathway by inducing a strong surface dipole.
We show that the decomposition of caesium lead halide perovskite nanocrystals under continuous X-ray illumination depends on the surface ligand. For oleic acid/oleylamine, we observe a fast decay accompanied by the formation of elemental lead and halogen. Upon surface functionalization with a metal porphyrin derivative, the decay is markedly slower and involves the disproportionation of lead to Pb-0 and Pb3+. In both cases, the decomposition is preceded by a contraction of the atomic lattice, which appears to initiate the decay. We find that the metal porphyrin derivative induces a strong surface dipole on the nanocrystals, which we hold responsible for the altered and slower decomposition pathway. These results are important for application of lead halide perovskite nanocrystals in X-ray scintillators.
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