Rationalizing the light-induced phase separation of mixed halide organic–inorganic perovskites

Sergiu Draguta, Onise Sharia, Seog Joon Yoon, Michael C. Brennan, Yurii V. Morozov, Joseph S. Manser, Prashant V. Kamat, William F. Schneider () and Masaru Kuno ()
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Sergiu Draguta: University of Notre Dame
Onise Sharia: University of Notre Dame
Seog Joon Yoon: University of Notre Dame
Michael C. Brennan: University of Notre Dame
Yurii V. Morozov: University of Notre Dame
Joseph S. Manser: University of Notre Dame
Prashant V. Kamat: University of Notre Dame
William F. Schneider: University of Notre Dame
Masaru Kuno: University of Notre Dame

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Mixed halide hybrid perovskites, CH3NH3Pb(I1−x Br x )3, represent good candidates for low-cost, 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.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00284-2

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DOI: 10.1038/s41467-017-00284-2

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