Vertex-Oriented Cube-Connected Pattern in CsPbBr3 Perovskite Nanorods and Their Optical Properties: An Ensemble to Single-Particle Study,Journal of the American Chemical Society

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Vertex-Oriented Cube-Connected Pattern in CsPbBr3 Perovskite Nanorods and Their Optical Properties: An Ensemble to Single-Particle Study
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-06-15 , DOI: 10.1021/jacs.3c03759
Arghyadeep Garai ₁ , E Krishnan Vishnu ₂ , Souvik Banerjee ₁ , Anoop Ajaya Kumar Nair ₂ , Suman Bera ₁ , K George Thomas ₂ , Narayan Pradhan ₁

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The design of cube-connected nanorods is accomplished by connecting seed nanocrystals of a defined shape in a particular orientation or by etching selective facets of preformed nanorods. In lead halide perovskite nanostructures, which retain mostly a hexahedron cube shape, such patterned nanorods can be designed with the anisotropic direction along the edge, vertex, or facet of seed cubes. Combining the Cs-sublattice platform for transforming metal halides to halide perovskites with facet-specific ligand binding chemistry, herein, vertex-oriented patterning of nanocubes in one-dimensional (1D) rod structures is reported. By tuning the length of host metal halides, their lengths could also be tuned from 100 nm to nearly 1000 nm. The symmetry of the hexagonal phase of host halide CsCdBr₃ and product orthorhombic CsPbBr₃ helped in maintaining the vertex [201] as the anisotropic direction. Neutral exciton recombination rates, extracted from photoluminescence blinking traces, showed a systematic increase from isolated cubes to cube-connected nanorods of various lengths. Efficient coupling of wave functions in vertex-oriented cube assemblies permits exciton delocalization. Our findings on carrier delocalization in cube-connected nanorods along their vertex direction having minimum interfacial contacts provide valuable insights into the fundamental chemistry of assembling anisotropic halide perovskite nanostructures as conducting wires.

中文翻译：

CsPbBr3 钙钛矿纳米棒中的顶点定向立方体连接图案及其光学特性：单粒子研究的整体

立方体连接的纳米棒的设计是通过以特定方向连接限定形状的种子纳米晶体或通过蚀刻预成型纳米棒的选择性面来完成的。在主要保留六面体立方体形状的卤化铅钙钛矿纳米结构中，可以将这种图案化纳米棒设计成沿着种子立方体的边缘、顶点或小面的各向异性方向。本文将用于将金属卤化物转化为卤化物钙钛矿的 Cs 亚晶格平台与面特异性配体结合化学相结合，报道了一维 (1D) 棒结构中纳米立方体的顶点定向图案化。通过调节主体金属卤化物的长度，它们的长度也可以从 100 nm 调节到接近 1000 nm。_{主体卤化物CsCdBr 3}六方相的对称性和产物正交CsPbBr ₃有助于维持顶点[201]作为各向异性方向。从光致发光闪烁痕迹中提取的中性激子复合率显示出从孤立的立方体到不同长度的立方体连接的纳米棒的系统性增加。面向顶点的立方体组件中波函数的有效耦合允许激子离域。我们对具有最小界面接触的立方体连接纳米棒沿其顶点方向的载流子离域的研究结果为将各向异性卤化物钙钛矿纳米结构组装为导线的基本化学提供了有价值的见解。

更新日期：2023-06-15

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