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首页> 外文期刊>Advanced Materials >Synthesis, Characterization, and Spectroscopy of Type-II Core/Shell Semiconductor Nanocrystals with ZnTe Cores
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Synthesis, Characterization, and Spectroscopy of Type-II Core/Shell Semiconductor Nanocrystals with ZnTe Cores

机译：具有ZnTe核的II型核/壳半导体纳米晶体的合成，表征和光谱

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摘要

We have synthesized colloidal type-II core/shell QDs in a one-pot process by alternate addition of precursors (CdO, S, Se, or Te) into the crude reaction solution of mono-disperse ZnTe cores. The core/shell particles showed a narrow size distribution and PL QYs of up to 30 % have been obtained. In this context the importance of a thin shell has been clearly demonstrated. The emission of the particles can be widely tuned from the visible into the near-IR region (550-900 nm) by increasing the thickness of the shell materials and by variation of the size ratio of core and shell. In comparison to other near-IR emitters, such as organic dye molecules, the PL QYs of the type-II core/shell particles can reach higher values. To further improve their stability and processability, which are prerequisites for labelling applications, it might be worthwhile to deposit an additional layer of a higher-bandgap material onto the outer CdSe (CdS, CdTe) shell. On the other hand, owing to the spatial separation of the charge carriers in ZnTe/CdSe QDs, these particles may lend themselves to applications in photoconducting or photovoltaic devices. Furthermore, the synthetic approach presented here opens a versatile route to other type-II core/shell QDs.
机译：我们通过将前体（CdO，S，Se或Te）交替添加到单分散ZnTe核的粗反应溶液中，通过一锅法合成了II型胶体核/壳QD。核/壳颗粒显示出狭窄的尺寸分布，并且已获得高达30％的PL QY。在这种情况下，薄壳的重要性已得到明确证明。通过增加壳材料的厚度以及改变核和壳的尺寸比，可以将颗粒的发射从可见光到近红外区域（550-900 nm）进行大范围调整。与其他近红外发射器（例如有机染料分子）相比，II型核/壳颗粒的PL QY可以达到更高的值。为了进一步提高它们的稳定性和可加工性（这是标记应用程序的先决条件），可能有必要在CdSe（CdS，CdTe）外壳上再沉积一层带隙更高的材料。另一方面，由于ZnTe / CdSe QD中电荷载子的空间分隔，这些颗粒可能适合用于光电导或光伏器件。此外，此处介绍的综合方法为通往其他II型核/壳QD开辟了一条通用途径。

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