In Situ Growth Mechanism of CsPbX3 (X = Cl, Br, and I) Quantum Dots in an Amorphous Oxide Matrix
In Situ Growth Mechanism of CsPbX3 (X = Cl, Br, and I) Quantum Dots in an Amorphous Oxide Matrix
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DOI：
10.1021/acs.chemmater.1c03522
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发表时间：
2022-02
影响因子：
8.6
通讯作者：
R. Zheng;J. Ueda;K. Shinozaki;S. Tanabe
中科院分区：
文献类型：
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作者：
R. Zheng;J. Ueda;K. Shinozaki;S. Tanabe
氧化物玻璃基质包埋是提高卤化物量子点稳定性的有效途径。然而，卤化物钙钛矿量子点在无定形基质中的原位生长机制尚未阐明。在这项工作中，卤化物量子点在无定形氧化物基质的生长过程中，成功地阐明通过原位光谱，分析电子显微镜，和X-射线散射/衍射技术。结果表明，卤化物量子点在非晶氧化物基体中的原位生长机制与传统微晶玻璃不同，更像是基于卤化物纳米玻璃的相变过程。典型地，在非晶氧化物基质中存在复杂的多相（卤化物纳米玻璃、CsPb 2X 5和CsPbX 3）转变，并且所获得的CsPbX 3 QD玻璃显示卤化物多相共存的微结构。更重要的是，从卤化物纳米玻璃到QD的结晶过程可以通过已知的方式诱导，包括机械力、水合和热处理。阐明的原位生长机理可能为高效卤化物钙钛矿量子点嵌入非晶材料和光电器件的发展铺平道路。
Oxide glass matrix embedding is an effective way to improve the stability of halide quantum dots (QDs). However, the in situ growth mechanism of halide perovskite QDs in an amorphous matrix has not been clarified. In this work, the growth process of halide QDs in an amorphous oxide matrix was successfully elucidated via in situ spectroscopy, analytical electron microscopy, and the X-ray scattering/diffraction technique. The results showed that the in situ growth mechanism of the halide QDs in the amorphous oxide matrix was different from that of traditional glass-ceramics, which was more like a halide nanoglass-based phase transition process. Typically, a complex multiphase (halide nanoglass, CsPb2X5, and CsPbX3) transition existed in the amorphous oxide matrix, and the obtained CsPbX3QD glass showed a halide multiphase coexisting microstructure. More importantly, the crystallization process from the halide nanoglass to QDs can be induced by known ways, including mechanical force, hydration, and heat treatment. The clarified in situ growth mechanism may pave the way toward the development of high-efficiency halide perovskite QD-embedded amorphous materials and optoelectronic devices.