Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 1, Pages 459-465Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b11157
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Funding
- National Key Research and Development Program of China [2017YFA0206701]
- Young Talent Thousand Program
- ENN group
- National Natural Science Foundation of China [51722201, 51672008, 91733301]
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Halide perovskites with reduced-dimensionality (e.g., quasi-2D, Q-2D) have promising stability while retaining their high performance as compared to their three-dimensional counterpart. Generally, they are obtained in (A(1))(2)(A(2))(n-1)PbnI3n+1 thin films by adjusting A site cations, however, the underlying crystallization kinetics mechanism is less explored. In this manuscript, we employed ternary cations halides perovskite (BA)(2)(MA,FA)(3)Pb4I13 Q-2D perovskites as an archetypal model, to understand the principles that link the crystal orientation to the carrier behavior in the polycrystalline film. We reveal that appropriate FA(+) incorporation can effectively control the perovskite crystallization kinetics, which reduces nonradiative recombination centers to acquire high-quality films with a limited nonorientated phase. We further developed an in situ photoluminescence technique to observe that the Q-2D phase (n = 2, 3, 4) was formed first followed by the generation of n = co perovskite in Q-2D perovskites. These findings substantially benefit the understanding of doping behavior in Q-2D perovskites crystal growth, and ultimately lead to the highest efficiency of 12.81% in (BA)(2)(MA,FA)(3)Pb4I13 Q-2D perovskites based photovoltaic devices.
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