Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-00284-2
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Funding
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy [DE-SC0014334]
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy [DE-FC02-04ER15533]
- ND Energy at the University of Notre Dame
- King Abdullah University of Science and Technology (KAUST) [OCRF-2014-CRG3-2268]
- ND Colleges of Science and Engineering
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Mixed halide hybrid perovskites, CH3NH3Pb(I1-xBrx)(3), represent good candidates for low-ost, high efficiency photovoltaic, and light-emitting devices. Their band gaps can be tuned from 1.6 to 2.3 eV, by changing the halide anion identity. Unfortunately, mixed halide perovskites undergo phase separation under illumination. This leads to iodide-and bromide-rich domains along with corresponding changes to the material's optical/electrical response. Here, using combined spectroscopic measurements and theoretical modeling, we quantitatively rationalize all microscopic processes that occur during phase separation. Our model suggests that the driving force behind phase separation is the bandgap reduction of iodide-rich phases. It additionally explains observed non-linear intensity dependencies, as well as self-limited growth of iodide-rich domains. Most importantly, our model reveals that mixed halide perovskites can be stabilized against phase separation by deliberately engineering carrier diffusion lengths and injected carrier densities.
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