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

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-d...

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Bibliographic Details
Published in:Nature communications 2024-02, Vol.15 (1), p.1609-1609, Article 1609
Main Authors: Zhang, Louwen, Zhou, Hai, Chen, Yibo, Zheng, Zhimiao, Huang, Lishuai, Wang, Chen, Dong, Kailian, Hu, Zhongqiang, Ke, Weijun, Fang, Guojia
Format: Article
Language:English
Subjects:
140/146
147/143
639/638/549
639/925/357/1017
Bromine
Carrier lifetime
Chlorine
Colloids
Confinement
Crystallization
Energy gap
Free energy
Heat of formation
Humanities and Social Sciences
Iodine
Lead
multidisciplinary
Optoelectronics
Perovskites
Phase transitions
Quantum dots
Room temperature
Science
Science (multidisciplinary)
Tin
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Summary: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 x Pb 1-x I 3 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 0.09 Pb 0.91 I 3 QDs show superior yellow emission properties with prolonged carrier lifetime and significantly increased colloidal stability compared to the pristine CsPbI 3 QDs, which is enabled by strong size confinement, Sn 2+ 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. Photoactive pure-iodine all-inorganic colloidal perovskite quantum dots (QDs) are attractive for optoelectronic applications, however their synthesis at room temperature is challenging. Here the authors report a room temperature strongly confined strategy to synthesize  CsSn x Pb 1-x I 3 QDs.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-45945-1