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Issue 7, 2017
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Do grain boundaries dominate non-radiative recombination in CH3NH3PbI3 perovskite thin films?

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Abstract

Here, we examine grain boundaries (GBs) with respect to non-GB regions (grain surfaces (GSs) and grain interiors (GIs)) in high-quality micrometer-sized perovskite CH3NH3PbI3 (or MAPbI3) thin films using high-resolution confocal fluorescence-lifetime imaging microscopy in conjunction with kinetic modeling of charge-transport and recombination processes. We show that, contrary to previous studies, GBs in our perovskite MAPbI3 thin films do not lead to increased recombination but that recombination in these films happens primarily in the non-GB regions (i.e., GSs or GIs). We also find that GBs in these films are not transparent to photogenerated carriers, which is likely associated with a potential barrier at GBs. Even though GBs generally display lower luminescence intensities than GSs/GIs, the lifetimes at GBs are no worse than those at GSs/GIs, further suggesting that GBs do not dominate non-radiative recombination in MAPbI3 thin films.

Graphical abstract: Do grain boundaries dominate non-radiative recombination in CH3NH3PbI3 perovskite thin films?

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Supplementary files

Article information


Submitted
23 Dec 2016
Accepted
13 Jan 2017
First published
13 Jan 2017

Phys. Chem. Chem. Phys., 2017,19, 5043-5050
Article type
Paper

Do grain boundaries dominate non-radiative recombination in CH3NH3PbI3 perovskite thin films?

M. Yang, Y. Zeng, Z. Li, D. H. Kim, C. Jiang, J. van de Lagemaat and K. Zhu, Phys. Chem. Chem. Phys., 2017, 19, 5043
DOI: 10.1039/C6CP08770A

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