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Unraveling Photostability of Mixed Cation Perovskite Films in Extreme Environment
East China Normal Univ, Peoples R China.
Soochow Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Soochow Univ, Peoples R China.
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2018 (English)In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 6, no 20, article id 1800262Article in journal (Refereed) Published
Abstract [en]

Organometal halide perovskites exhibit a bright future for applications in solar cells, as efficiency has achieved over 22%. The long-term stability remains a major obstacle for commercialization. Here, it is found that three cationic compositional engineered perovskites, MAPb(I0.83Br0.17)(3), FA(0.83)MA(0.17)Pb(I0.83Br0.17)(3), and Cs-0.1(FA(0.83)MA(0.17))(0.9)Pb(I0.83Br0.17)(3), undergo severe degradation under white-light illumination in ultrahigh vacuum (UHV) environment, but the rate of degradation is significantly lower for the mixed cation perovskites. This is attributed to the defect-induced trap states that trigger the strong coupling between the photoexcited carriers and the crystal lattice. The observed behavior supports the view of the mixed cations suppressing the photoinduced degradation. It is further demonstrated that UHV environment remarkably accelerates the degradation of the perovskite films under illumination, which delivers a very important message that the current hybrid perovskite materials and their optoelectronic devices are not suitable for application in outer space. Moreover, the applied UHV environment can be an accelerated test method to estimate the photostability of the perovskites.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 6, no 20, article id 1800262
Keywords [en]
extreme environment; mixed cation perovskite films; perovskite solar cells; photoinduced degradation; ultrahigh vacuum
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:liu:diva-152618DOI: 10.1002/adom.201800262ISI: 000447743000003OAI: oai:DiVA.org:liu-152618DiVA, id: diva2:1262091
Note

Funding Agencies|National Science Foundation of China [11604099, 11474214, 51811530011, 11774092]; Shanghai Science and Technology Innovation Action Plan [17JC1402500]; Swedish Research Council [2016-05498]; Goran Gustafsson Foundation for Research in Nature Sciences and Medicine; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]; China Scholarship Council; Fundamental Research Funds for the Central Universities

Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2018-11-09

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