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

Autor:	Wahl, Jan, Haizmann, Philipp, Kirsch, Christopher, Frecot, Rene, Mukharamova, Nastasia, Assalauova, Dameli, Kim, Young Yong, Zaluzhnyy, Ivan, Chassé, Thomas, Vartanyants, Ivan A., Peisert, Heiko, Scheele, Marcus
Rok vydání:	2021
Předmět:	Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
Popis:	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. Comment: 31 pages, 14 Figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2112.10004 Zobrazit plný text záznamu View this record from Arxiv