Photodegradation of Organometal Hybrid Perovskite Nanocrystals: Clarifying the Role of Oxygen by Single-Dot Photoluminescence

Photostability has been a major issue for perovskite materials. Understanding the photodegradation mechanism and suppressing it are of central importance for applications. By investigating single-dot photoluminescence spectra and the lifetime of MAPbX3 (MA = CH3NH3 +, X = Br, I) nanocrystals with qu...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2019-02, Vol.10 (4), p.864-869
Main Authors: Liu, Lige, Deng, Luogen, Huang, Sheng, Zhang, Pei, Linnros, Jan, Zhong, Haizheng, Sychugov, Ilya
Format: Article
Language:English
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Summary:Photostability has been a major issue for perovskite materials. Understanding the photodegradation mechanism and suppressing it are of central importance for applications. By investigating single-dot photoluminescence spectra and the lifetime of MAPbX3 (MA = CH3NH3 +, X = Br, I) nanocrystals with quantum confinement under different conditions, we identified two separate pathways in the photodegradation process. The first is the oxygen-assisted light-induced etching process (photochemistry). The second is the light-driven slow charge-trapping process (photophysics), taking place even in oxygen-free environment. We clarified the role of oxygen in the photodegradation process and show how the photoinduced etching can be successfully suppressed by OSTE polymer, preventing an oxygen-assisted reaction.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.9b00143