Spontaneous crystallization of strongly confined CsSnxPb1-xI3 perovskite colloidal quantum dots at room temperature

Louwen Zhang, Hai Zhou (), Yibo Chen, Zhimiao Zheng, Lishuai Huang, Chen Wang, Kailian Dong, Zhongqiang Hu, Weijun Ke and Guojia Fang ()
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Louwen Zhang: Dongguan University of Technology
Hai Zhou: Dongguan University of Technology
Yibo Chen: China Academy of Engineering Physics
Zhimiao Zheng: Wuhan University
Lishuai Huang: Wuhan University
Chen Wang: Wuhan University
Kailian Dong: Wuhan University
Zhongqiang Hu: Xi’an Jiaotong University
Weijun Ke: Wuhan University
Guojia Fang: Wuhan University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract The scalable and low-cost room temperature (RT) synthesis for pure-iodine all-inorganic perovskite colloidal quantum dots (QDs) is a challenge due to the phase transition induced by thermal unequilibrium. Here, we introduce a direct RT strongly confined spontaneous crystallization strategy in a Cs-deficient reaction system without polar solvents for synthesizing stable pure-iodine all-inorganic tin-lead (Sn-Pb) alloyed perovskite colloidal QDs, which exhibit bright yellow luminescence. By tuning the ratio of Cs/Pb precursors, the size confinement effect and optical band gap of the resultant CsSnxPb1-xI3 perovskite QDs can be well controlled. This strongly confined RT approach is universal for wider bandgap bromine- and chlorine-based all-inorganic and iodine-based hybrid perovskite QDs. The alloyed CsSn0.09Pb0.91I3 QDs show superior yellow emission properties with prolonged carrier lifetime and significantly increased colloidal stability compared to the pristine CsPbI3 QDs, which is enabled by strong size confinement, Sn2+ passivation and enhanced formation energy. These findings provide a RT size-stabilized synthesis pathway to achieve high-performance pure-iodine all-inorganic Sn-Pb mixed perovskite colloidal QDs for optoelectronic applications.

Date: 2024
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DOI: 10.1038/s41467-024-45945-1

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