Microwave-Assisted Solution–Liquid–Solid Synthesis of Single-Crystal Copper Indium Sulfide Nanowires

• Published in: Crystal growth & design Vol. 15; no. 6; pp. 2859 - 2866
• Main Authors: Krylova, Galyna, Yashan, Halyna, Hauck, John G, Burns, Peter C, McGinn, Paul J, Na, Chongzheng
• Format: Journal Article
• Language: English
• Published: American Chemical Society 03-06-2015
• ISSN: 1528-7483; 1528-7505
• DOI: 10.1021/acs.cgd.5b00284

Chalcopyrite copper indium sulfide (CuInS2) is an important semiconductor with a bandgap optimal for terrestrial solar energy conversion. Building photovoltaic and microelectronic devices using one-dimensional CuInS2 nanowires can offer directional conduits for rapid and undisrupted charge transport. Currently, single-crystal CuInS2 nanowires can be prepared only using vapor-based methods. Here, we report, for the first time, the synthesis of single-crystal CuInS2 nanowires using a microwave-assisted solution–liquid–solid (MASLS) method. We show that CuInS2 nanowires with diameters of less than 10 nm can be prepared at a rapid rate of 33 nm s–1 to more than 10 μm long in less than 10 min, producing a high mass yield of 31%. We further show that the nanowires are free of structural defects and have a near-stoichiometric composition. The success of MASLS in preparing high-quality tertiary nanowires is explained by a eutectic growth mechanism involving an overheated alloy catalyst.