Polytypic Nanocrystals of Cu-Based Ternary Chalcogenides: Colloidal Synthesis and Photoelectrochemical Properties

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• 作者：Liang Wu ; Shi-You Chen ; Feng-Jia Fan ; Tao-Tao Zhuang ; Chen-Min Dai ; Shu-Hong Yu
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：138
• 期：17
• 页码：5576-5584
• 全文大小：781K
• 年卷期：0
• ISSN：1520-5126

文摘

Heterocrystalline polytype nanostructured semiconductors have been attracting more and more attention in recent years due to their novel structures and special interfaces. Up to now, controlled polytypic nanostructures are mostly realized in II–VI and III–V semiconductors. Herein, we report the synthesis and photoelectrochemical properties of Cu-based ternary I–III–VI₂ chalcogenide polytypic nanocrystals, with a focus on polytypic CuInS₂ (CIS), CuInSe₂ (CISe), and CuIn(S_0.5Se_0.5)₂ alloy nanocrystals. Each obtained polytypic nanocrystal is constructed with a wurtzite hexagonal column and a zinc blende/chalcopyrite cusp, regardless of the S/Se ratio. The growth mechanisms of polytypic CIS and CISe nanocrystals have been studied by time-dependent experiments. The polytypic nanocrystals are solution-deposited on indium–tin oxide glass substrate and used as a photoelectrode, thus showing stable photoelectrochemical activity in aqueous solution. Density functional theory calculation was used to study the electronic structure and the band gap alignment. This versatile synthetic method provides a new route for synthesis of novel polytypic nanostructured semiconductors with unique properties.