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arXiv · 2112.10004

Impact of the Ligand Shell on Structural Changes and Decomposition of All-Inorganic Mixed-Halide Perovskite (CsPbX3) Nanocrystals under X-Ray Illumination

Jan Wahl·Philipp Haizmann·Christopher Kirsch·Rene Frecot·Nastasia Mukharamova·Dameli Assalauova·Young Yong Kim·Ivan Zaluzhnyy·Thomas Chassé·Ivan A. Vartanyants·Heiko Peisert·Marcus Scheele
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Abstract

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 derivate, the decay is markedly slower and involves the disproportionation of lead to Pb0 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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Jan Wahl, Philipp Haizmann, Christopher Kirsch, Rene Frecot, Nastasia Mukharamova, Dameli Assalauova, Young Yong Kim, Ivan Zaluzhnyy, Thomas Chassé, Ivan A. Vartanyants, Heiko Peisert, Marcus Scheele. 2021-12-18. Impact of the Ligand Shell on Structural Changes and Decomposition of All-Inorganic Mixed-Halide Perovskite (CsPbX3) Nanocrystals under X-Ray Illumination. https://arxiv.org/abs/2112.10004

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