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

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Zhen Jiang, Chun-Sheng Kim, Dong Hoe Yang, Mengjin Zeng, Yining Lagemaat, Jao de Zhu, Kai
Copyright Year	2017
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.
Starting Page	5043
Ending Page	5050
Page Count	8
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	7
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c6cp08770a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Perovskite Carrier generation and recombination Luminescence Fluorescence-lifetime imaging microscopy Grain boundary
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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