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; Guojia Fang

doi:10.1038/s41467-024-45945-1

Spontaneous crystallization of strongly confined CsSn_xPb_1-xI₃ perovskite colloidal quantum dots at room temperature

Nat Commun. 2024 Feb 21;15(1):1609. doi: 10.1038/s41467-024-45945-1.

Authors

Louwen Zhang^{1

2

3}, Hai Zhou⁴, Yibo Chen⁵, Zhimiao Zheng², Lishuai Huang², Chen Wang², Kailian Dong², Zhongqiang Hu³, Weijun Ke², Guojia Fang⁶

Affiliations

¹ International School of Microelectronics, Dongguan University of Technology, Dongguan, 523808, Guangdong, P. R. China.
² Key Lab of Artifcial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
³ School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
⁴ International School of Microelectronics, Dongguan University of Technology, Dongguan, 523808, Guangdong, P. R. China. hizhou@dgut.edu.cn.
⁵ Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, P. R. China.
⁶ Key Lab of Artifcial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China. gjfang@whu.edu.cn.

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 CsSn_xPb_1-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 CsSn_0.09Pb_0.91I₃ 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.

Abstract

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