Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 22, Pages 7237-7244Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b02931
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Funding
- National Natural Science Foundation of China [21573022, 51861135101, 21688102, 21590801, 21703222]
- Fundamental Research Funds for the Central Universities
- Recruitment Program of Global Youth Experts of China
- Beijing Normal University
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The ordered alignment of polar organic cations in hybrid organic-inorganic perovskites causes a ferroelectric phase, which is believed to be benign for photovoltaic devices. Using a combination of time-domain density functional theory and nonadiabatic molecular dynamics, we study the influence of the interactions of polar MA (CH3NH3+) cations and between their inorganic counterparts on the nonradiative electron-hole recombination in the room-temperature ferroelectric MAPbI(3) perovskite. We show that ferroelectric alignment of the polar C-N bonds favors charge separation and reduces nonadiabatic coupling. Symmetry breaking enhances low-frequency collective motions and introduces additional high-frequency vibrations, thus accelerating quantum decoherence. Both factors contribute to suppressing the nonradiative electron-hole recombination, extending the charge carrier lifetimes to several nanoseconds and showing a factor of 3 increase compared to the pristine system. Consequently, ferroelectric engineering provides an excellent route to improve hybrid perovskite device performance as a result of long-range charge separation and slow charge recombination.
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