卤化物
纳米晶
钙钛矿(结构)
油胺
歧化
化学
金属
卤素
铯
材料科学
无机化学
光化学
催化作用
纳米技术
结晶学
有机化学
烷基
作者
Jan Wahl,Philipp Haizmann,Christopher Kirsch,Rene Frecot,Nastasia Mukharamova,Dameli Assalauova,Young Yong Kim,Ivan A. Zaluzhnyy,Thomas Chassé,Ivan A. Vartanyants,Heiko Peisert,Marcus Scheele
摘要
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 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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