Solventless mechanochemical synthesis of Sn-based halide perovskite microcrystals with high stability tracked by photoluminescence spectroscopy
Solventless mechanochemical synthesis of Sn-based halide perovskite microcrystals with high stability tracked by photoluminescence spectroscopy
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DOI：
10.1016/j.jlumin.2023.120432
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发表时间：
2023-12
影响因子：
3.6
通讯作者：
Xuan Huang;Xiaobing Tang;Xiyu Wen;Y. C. Lu;Fuqian Yang
中科院分区：
文献类型：
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作者：
Xuan Huang;Xiaobing Tang;Xiyu Wen;Y. C. Lu;Fuqian Yang
从可持续发展的角度出发，开发无溶剂合成无铅钙钛矿的方法具有重要的现实意义。在这项工作中，我们使用简单的机械化学方法，直接从前驱体粉末（CsX和SnX2(X = I, Br, Cl)）在环境条件下合成了一系列无铅的sn基卤化物钙钛矿微晶体（粉末）。这样的方法既节能又避免了有毒溶剂的使用。前驱体粉末在机械化学加工过程中，第1小时由cssn2br5到cssnbr3, 28天后进入cs2snbr6的稳定相；第1小时由cs2sncl4到cssncl3, 36天后最终进入cs2sncl6的稳定相。稳定的cs2snbr6粉末在785 nm的激发下发出以930 nm为中心的光，稳定的cs2snbr6粉末在365 nm的激发下发出以682nm为中心的光。稳定后的cs2sni6和cs2snbr6粉末均表现出良好的长期结构稳定性和光学稳定性，且cs2snbr6粉末的热稳定性优于cs2sni6粉末。这项工作可能为无铅卤化物钙钛矿的大规模生产和工业化提供了一条绿色路线。
Developing solvent-free methods to synthesize lead-free perovskites is of practical importance from the viewpoint of sustainability. In this work, we use a facile mechanochemical approach to synthesize a series of lead-free Sn-based halide perovskite microcrystals (powders) in ambient conditions directly from precursor powders (CsX and SnX2(X = I, Br, Cl)) without any solvent. Such an approach is energy-saving and avoids the use of toxic solvents. There exists phase evolution during the mechanochemical processing of the precursor powders with CsSn2Br5to CsSnBr3in the first hour and finally into the stabilized phase of Cs2SnBr6after 28 days and with Cs2SnCl4to CsSnCl3in the first hour and finally to the stabilized phase of Cs2SnCl6after 36 days. The stabilized Cs2SnI6powders emit light centered at 930 nm under the excitation of 785 nm, and the stabilized Cs2SnBr6powders emit light centered at 682 nm under the excitation of 365 nm. Both the stabilized Cs2SnI6and Cs2SnBr6powders exhibit excellent long-term structural and optical stabilities, and the Cs2SnBr6powders have a better thermal stability than the Cs2SnI6powders. This work likely offers a green-route synthesis of lead-free halide perovskites towards large-scale manufacturing and industrialization.