التفاصيل البيبلوغرافية
| العنوان: |
Spontaneous crystallization of strongly confined CsSnxPb1-xI3 perovskite colloidal quantum dots at room temperature. |
| المؤلفون: |
Zhang, Louwen, Zhou, Hai, Chen, Yibo, Zheng, Zhimiao, Huang, Lishuai, Wang, Chen, Dong, Kailian, Hu, Zhongqiang, Ke, Weijun, Fang, Guojia |
| المصدر: |
Nature Communications; 2/21/2024, Vol. 15 Issue 1, p1-9, 9p |
| مصطلحات موضوعية: |
SEMICONDUCTOR nanocrystals, COLLOIDAL crystals, PEROVSKITE, PHASE transitions, BAND gaps, CRYSTALLIZATION, TIN alloys |
| مستخلص: |
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. 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 CsSnxPb1-xI3 QDs. [ABSTRACT FROM AUTHOR] |
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