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

Liu, LigeKTH,Tillämpad fysik,Beijing Inst Technol, Sch Phys, Beijing Key Lab, Nanophoton & Ultrafine Optoelect Syst, 5 South St Zhongguancun, Beijing 100081, Peoples R China (author)

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

QC 20190327
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.

Deng, LuogenBeijing Inst Technol, Sch Phys, Beijing Key Lab, Nanophoton & Ultrafine Optoelect Syst, 5 South St Zhongguancun, Beijing 100081, Peoples R China. (author)
Huang, ShengBeijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China. (author)
Zhang, PeiKTH,Tillämpad fysik,Zhengzhou Univ Light Ind, Sch Elect & Informat Engn, Henan Key Lab Informat Based Elect Appliances, Zhengzhou 450002, Henan, Peoples R China(Swepub:kth)u1qhmcto (author)
Linnros, Jan,1953-KTH,Fotonik(Swepub:kth)u1t79mee (author)
Zhong, HaizhengBeijing Inst Technol, Sch Mat Sci & Engn, 5 South St Zhongguancun, Beijing 100081, Peoples R China. (author)
Sychugov, IlyaKTH,Fotonik(Swepub:kth)u1cgceze (author)
KTHTillämpad fysik (creator_code:org_t)

In:The Journal of Physical Chemistry Letters: AMER CHEMICAL SOC10:4, s. 864-8691948-7185

By the author/editor: Liu, Lige; Deng, Luogen; Huang, Sheng; Zhang, Pei; Linnros, Jan, 19 ...; Zhong, Haizheng; show more...; Sychugov, Ilya; show less...

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