From Precursor Powders to CsPbX3 Perovskite Nanowires: One-Pot Synthesis, Growth Mechanism, and Oriented Self-Assembly.
From Precursor Powders to CsPbX3 Perovskite Nanowires: One-Pot Synthesis, Growth Mechanism, and Oriented Self-Assembly.
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DOI：
10.1002/anie.201707224
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发表时间：
2017-10
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通讯作者：
Yu Tong;Bernhard J. Bohn;E. Bladt;Kun Wang;P. Müller‐Buschbaum;S. Bals;A. Urban;Lakshminarayana Polavarapu-Laks
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文献类型：
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作者：
Yu Tong;Bernhard J. Bohn;E. Bladt;Kun Wang;P. Müller‐Buschbaum;S. Bals;A. Urban;Lakshminarayana Polavarapu-Laks
半导体纳米线的胶体合成和组装一直吸引着人们的极大兴趣。在此，我们描述了直接从前体粉末单步配体介导合成单晶CsPbBr 3钙钛矿纳米线（NW）。反应过程和形态演化的研究表明，最初形成的CsPbBr 3纳米立方体通过定向附着机制转化为纳米线。通过随后的卤化物离子交换改变卤化物（Cl、Br和I）组成，可以在整个可见光范围内调谐纳米线的光学性质。单粒子的研究表明，这些纳米线表现出强烈的偏振发射的偏振各向异性为0.36。更重要的是，纳米线可以在空气/液体界面以准定向的方式自组装。该方法也应该容易地适用于不同形态的钙钛矿纳米晶体，以将其集成到纳米级光电器件中。
The colloidal synthesis and assembly of semiconductor nanowires continues to attract a great deal of interest. Herein, we describe the single-step ligand-mediated synthesis of single-crystalline CsPbBr3 perovskite nanowires (NWs) directly from the precursor powders. Studies of the reaction process and the morphological evolution revealed that the initially formed CsPbBr3 nanocubes are transformed into NWs through an oriented-attachment mechanism. The optical properties of the NWs can be tuned across the entire visible range by varying the halide (Cl, Br, and I) composition through subsequent halide ion exchange. Single-particle studies showed that these NWs exhibit strongly polarized emission with a polarization anisotropy of 0.36. More importantly, the NWs can self-assemble in a quasi-oriented fashion at an air/liquid interface. This process should also be easily applicable to perovskite nanocrystals of different morphologies for their integration into nanoscale optoelectronic devices.