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首页> 外文期刊>ACS applied materials & interfaces >Extraordinary Interfacial Stitching between Single All-Inorganic Perovskite Nanocrystals
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Extraordinary Interfacial Stitching between Single All-Inorganic Perovskite Nanocrystals

机译：单无机钙钛矿纳米晶体之间的非凡界面缝合

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All-inorganic cesium lead halide perovskite nanocrystals are extensively studied because of their outstanding optoelectronic properties. Being of a cubic shape and typically featuring a narrow size distribution, CsPbX3 (X = Cl, Br, and I) nanocrystals are the ideal starting material for the development of homogeneous thin films as required for photovoltaic and optoelectronic applications. Recent experiments reveal spontaneous merging of drop-casted CsPbBr3 nanocrystals, which is promoted by humidity and mild-temperature treatments and arrested by electron beam irradiation. Here, we make use of atom-resolved annular dark-field imaging microscopy and valence electron energy loss spectroscopy in a state-of-the-art low-voltage monochromatic scanning transmission electron microscope to investigate the aggregation between individual nanocrystals at the atomic level. We show that the merging process preserves the elemental composition and electronic structure of CsPbBr3 and takes place between nanocrystals of different sizes and orientations. In particular, we reveal seamless stitching for aligned nanocrystals, similar to that reported in the past for graphene flakes. Because the crystallographic alignment occurs naturally in drop-casted layers of CsPbX3 nanocrystals, our findings constitute the essential first step toward the development of large-area nanosheets with band gap energies predesigned by the nanocrystal choice-the gateway to large-scale photovoltaic applications of inorganic perovskites.
机译：由于其出色的光电性能，广泛研究了全无机铯铅卤化镓植物纳米晶体。具有立方形状并且通常具有窄尺寸分布，CSPBX3（X = CL，BR和I）纳米晶体是用于开发均匀薄膜的理想原料，如光伏和光电应用所需的。最近的实验揭示了液滴CSPBBR3纳米晶体的自发合并，其通过湿度和温和的温度处理促进并被电子束照射被捕。这里，我们在最先进的低压单色扫描透射电子显微镜中使用原子分辨的环形暗场成像显微镜和价电子能量损失光谱，以研究原子水平的各个纳米晶体之间的聚集。我们表明合并过程保留了CSPBBR3的元素组成和电子结构，并在不同尺寸和方向的纳米晶体之间进行。特别是，我们揭示了对齐的纳米晶体的无缝缝合，类似于过去报道的石墨烯片。因为结晶取向自然发生在CSPBX3纳米晶体的滴隙层中，所以我们的研究结果构成了朝着大面积纳米片开发的基本第一步，其中具有纳米晶选择预测的带隙能量 - 无机大规模光伏应用的网关Perovskites。

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