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An optical dynamic study of MAPbBr3 single crystals passivated with MAPbCl3/I3-MAPbBr3 heterojunctions
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2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 6, p. 4516-4521Article in journal (Refereed) Published
Abstract [en]

Recently, perovskite based solar cells have attracted lots of research interest, some of which is in the passivation of perovskite surfaces, particularly the heterojunction based surface passivation. In this study, the optical dynamics of MAPbBr3 single crystals with and without heterojunction passivation were studied systematically by means of a time-resolved spectroscopic technique for the first time. The emission lifetime of MAPbBr3 single crystals under two-photon (1064 nm) excitation is a few orders of magnitude longer than that measured under one-photon (355 nm or 532 nm) excitation. Interestingly, with surface passivation, the lifetime measured at 355 nm excitations could be tuned significantly, whereas the lifetime change under 1064 nm excitations was considerably less. Our results give a direct evidence of surface quench by comparing the lifetimes before and after surface passivation. Furthermore, the results demonstrate that proper MAPbCl3-MAPbBr3 heterojunctions can dramatically reduce the recombination channels in the surface region, which can be potentially useful for perovskite based solar cells, light emitting diodes (LED), and sensitive detectors.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2017. Vol. 19, no 6, p. 4516-4521
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-207411DOI: 10.1039/c6cp07182aScopus ID: 2-s2.0-85013392310OAI: oai:DiVA.org:kth-207411DiVA, id: diva2:1103356
Note

Funding details: MOST, Ministry of Science and Technology of the People's Republic of China; Funding details: NSFC, National Natural Science Foundation of China; Funding details: STCSM, Science and Technology Commission of Shanghai Municipality; Funding text: This study was supported by the Science and Technology Commission of Shanghai Municipality, the Ministry of Science and Technology of China, and the National Science Foundation of China.

QC 20170530

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved

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