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Interlayer Polarization Explains Slow Charge Recombination in Two-Dimensional Halide Perovskites by Nonadiabatic
Jianfeng Su1, Qijing Zheng2, Yongliang Shi2,3
1Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, P. R. China.
Thicker diamine-based 2D perovskites show longer carrier lifetimes due to suppressed electron-hole recombination. This enhanced performance stems from interlayer electric polarization and phonon excitation, crucial for optoelectronics and photovoltaics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Photovoltaics
Background:
- Two-dimensional (2D) perovskites are promising for optoelectronics and photovoltaics.
- Nonradiative electron-hole (e-h) recombination is a key limitation to their efficiency.
Purpose of the Study:
- Investigate the influence of thickness on e-h recombination dynamics in diamine-based 2D perovskites.
- Understand the mechanisms behind prolonged carrier lifetimes in multilayer structures.
Main Methods:
- Utilized *ab initio* non-adiabatic molecular dynamics (NAMD) simulations.
- Analyzed thickness-dependent e-h recombination dynamics.
Main Results:
- Multilayer 2D perovskites exhibit suppressed e-h recombination.
- Spontaneous interlayer electric polarization localizes electrons and holes in different inorganic layers.
- Phonon excitation contributes to rapid pure dephasing and longer recombination times.
Conclusions:
- The combined effects of interlayer polarization and phonon excitation lead to prolonged carrier lifetimes in multilayer 2D perovskites.
- Understanding these mechanisms is vital for improving 2D perovskite device efficiency.
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