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Effect of density of surface defects on photoluminescence properties in MAPbI3 perovskite films

In this work we investigate the effect of tuning the density of surface defects of methylammonium lead triiodide (MAPbI3) perovskite films on their photoluminescence (PL) properties. Control over the density of defects is achieved by fractionally changing the perovskite precursor stoichiometry, whic...

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Bibliographic Details
Main Authors: Faßl, Paul (Author) , Zakharko, Yuriy (Author) , Falk, Lukas M. (Author) , Goetz, Katelyn (Author) , Paulus, Fabian (Author) , Taylor, Alexander D. (Author) , Zaumseil, Jana (Author) , Vaynzof, Yana (Author)
Format: Article (Journal)
Language:English
Published: 5 February 2019
In: Journal of materials chemistry. C, Materials for optical and electronic devices
Year: 2019, Volume: 7, Issue: 18, Pages: 5285-5292
ISSN:2050-7534
DOI:10.1039/C8TC05998E
Online Access:Verlag, Volltext: https://doi.org/10.1039/C8TC05998E
Verlag, Volltext: https://pubs.rsc.org/en/content/articlelanding/2019/tc/c8tc05998e
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Author Notes:Paul Fassl, Yuriy Zakharko, Lukas M. Falk, Katelyn P. Goetz, Fabian Paulus, Alexander D. Taylor, Jana Zaumseil and Yana Vaynzof
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Summary:In this work we investigate the effect of tuning the density of surface defects of methylammonium lead triiodide (MAPbI3) perovskite films on their photoluminescence (PL) properties. Control over the density of defects is achieved by fractionally changing the perovskite precursor stoichiometry, which results in a gradual change in the I− and MA+ vacancy/interstitial densities. PL spectroscopy studies reveal that an increase in stoichiometry results in both a lower initial PL and a lower enhancement upon exposure to light in the ambient environment. Confocal PL microscopy and time resolved studies show that the heterogeneity in emission properties across the samples is also closely related to the spatial distribution of the density of surface defects. Our results show that while the overall density of defects dictates the initial PL, it is the density of shallow defects that determines the evolution of the PL with time.
Item Description:Im Titel ist die Zahl "3" tiefgestellt
Gesehen am 19.08.2019
Physical Description:Online Resource
ISSN:2050-7534
DOI:10.1039/C8TC05998E

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