Ultrafast cation doping of perovskite quantum dots in flow
Ultrafast cation doping of perovskite quantum dots in flow
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DOI：
10.1016/j.matt.2021.04.025
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发表时间：
2021-07-07
期刊：
影响因子：
18.9
通讯作者：
Abolhasani, Milad
中科院分区：
文献类型：
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作者：
Bateni, Fazel;Epps, Robert W.;Abolhasani, Milad
在全无机金属卤化物钙钛矿量子点（PQD）中，具有大带隙能量的氯化铯铅（CsPbCl 3）是通过在其激子带隙内并入额外的内部能量转移来增强PQD辐射途径的优秀候选者。在这项研究中，我们介绍了一个合成后的化学超快金属阳离子掺杂CsPbCl3量子点具有高度的可调性，使用模型过渡金属杂质掺杂剂，锰。由于合成后金属阳离子掺杂反应的快速性质，采用工程化的时空转换策略来解开掺杂过程的动力学和基本机制。使用一个模块化的微流控平台配备了一个平移原位吸收和光致发光光谱探针，我们提出了一个异质表面掺杂机制，通过空位辅助金属阳离子迁移。所开发的流动掺杂策略可以为按需调节光电性能和可扩展的高质量金属阳离子掺杂PQD的精确合成开辟新的途径。
Among all-inorganic metal halide perovskite quantum dots (PQDs), cesium lead chloride (CsPbCl3) with its large band-gap energy is an excellent candidate for enhancement of PQD radiative pathways through incorporation of additional internal energy transfer within its exciton band gap. In this study, we introduce a post-synthetic chemistry for ultrafast metal cation doping of CsPbCl3 QDs with a high degree of tunability, using a model transition metal impurity dopant, manganese. Due to the fast nature of the post-synthetic metal cation-doping reaction, an engineered time-to-space transformation strategy is employed to unravel the kinetics and fundamental mechanism of the doping process. Using a modular microfluidic platform equipped with a translational in situ absorption and photoluminescence spectroscopy probe, we propose a heterogeneous surface-doping mechanism through a vacancy-assisted metal cation migration. The developed in-flow doping strategy can open new avenues for on-demand optoelectronic properties tuning and scalable precision synthesis of high-quality metal cation-doped PQDs.