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Photodegradation of Organometal Hybrid Perovskite Nanocrystals: Clarifying the Role of Oxygen by Single-Dot Photoluminescence
KTH, School of Engineering Sciences (SCI), Applied Physics. Beijing Inst Technol, Sch Phys, Beijing Key Lab, Nanophoton & Ultrafine Optoelect Syst, 5 South St Zhongguancun, Beijing 100081, Peoples R China.
Beijing Inst Technol, Sch Phys, Beijing Key Lab, Nanophoton & Ultrafine Optoelect Syst, 5 South St Zhongguancun, Beijing 100081, Peoples R China..
Beijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China..
KTH, School of Engineering Sciences (SCI), Applied Physics. Zhengzhou Univ Light Ind, Sch Elect & Informat Engn, Henan Key Lab Informat Based Elect Appliances, Zhengzhou 450002, Henan, Peoples R China.
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2019 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 10, no 4, p. 864-869Article in journal (Refereed) Published
Abstract [en]

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 MAPbX(3) (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.

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AMER CHEMICAL SOC , 2019. Vol. 10, no 4, p. 864-869
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URN: urn:nbn:se:kth:diva-246263DOI: 10.1021/acs.jpclett.9b00143ISI: 000459948800026PubMedID: 30730749Scopus ID: 2-s2.0-85061915174OAI: oai:DiVA.org:kth-246263DiVA, id: diva2:1299492
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QC 20190327

Available from: 2019-03-27 Created: 2019-03-27 Last updated: 2019-04-04Bibliographically approved

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Liu, LigeZhang, PeiLinnros, JanSychugov, Ilya

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