Formation of Nanoscale Composites of Compound Semiconductors Driven by Charge Transfer

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• 作者：Weiwei Gao ; Roberto dos Reis ; Laura T. Schelhas ; Vanessa L. Pool ; Michael F. Toney ; Kin Man Yu ; Wladek Walukiewicz
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：16
• 期：8
• 页码：5247-5254
• 全文大小：575K
• 年卷期：0
• ISSN：1530-6992

文摘

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.