期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 19, 期 7, 页码 5043-5050出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp08770a
关键词
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资金
- U.S. Department of Energy [DE-AC36-08GO28308]
- U.S. Department of Energy SunShot Initiative under the Next Generation Photovoltaics 3 program [DE-FOA-0000990]
- BioEnergy Science Center (BESC), a DOE Bioenergy Research Center - Office of Biological and Environmental Research (BER) in the DOE Office of Science
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences (DOE)
- hybrid perovskite solar cell program of the National Center for Photovoltaics - U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
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 MAPbI(3)) 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.
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