Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States.
Department of Physics and Materials Science, City University of Hong Kong , Kowloon, Hong Kong.
Nano Lett. 2016 Aug 10;16(8):5247-54. doi: 10.1021/acs.nanolett.6b02395. Epub 2016 Aug 1.
Composites are a class of materials that are formed by mixing two or more components. These materials often have new functional properties compared to their constituent materials. Traditionally composites are formed by self-assembly due to structural dissimilarities or by engineering different layers or structures in the material. Here we report the synthesis of a uniform and stoichiometric composite of CdO and SnTe with a novel nanocomposite structure stabilized by the dissimilarity of the electronic band structure of the constituent materials. The composite has interesting electronic properties which range from highly n-type in CdO to semi-insulating in the intermediate composition range to highly p-type in SnTe. This can be explained by the overlap of the conduction and valence band of the constituent compounds. Ultimately, our work identifies a new class of composite semiconductors in which nanoscale self-organization is driven and stabilized by charge transfer between constituent materials.
复合材料是由两种或多种成分混合形成的一类材料。与组成材料相比，这些材料通常具有新的功能特性。传统上，复合材料是通过自组装形成的，这是由于结构上的差异，或者是通过在材料中工程不同的层或结构。在这里，我们报告了一种新型纳米复合材料结构的均匀和化学计量比的 CdO 和 SnTe 复合材料的合成，该结构通过组成材料的电子能带结构的差异来稳定。该复合材料具有有趣的电子特性，从 CdO 的高度 n 型到中间组成范围的半绝缘型到 SnTe 的高度 p 型。这可以通过组成化合物的导带和价带的重叠来解释。最终，我们的工作确定了一类新的复合半导体，其中纳米级自组织是由组成材料之间的电荷转移驱动和稳定的。
