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Nanotechnology. 2013 Mar 15;24(10):105706. doi: 10.1088/0957-4484/24/10/105706. Epub 2013 Feb 20.

Colloidal synthesis of wurtzite Cu₂CoSnS₄ nanocrystals and the photoresponse of spray-deposited thin films.

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1
School of Chemistry and Chemical Engineering, Southeast University, Nanjing, People's Republic of China.

Abstract

Monodisperse nanocrystals of a new wurtzite phase of Cu(2)CoSnS(4) (CCTS) have been synthesized using a simple solution-based method. The wurtzite CCTS nanocrystals grow in the shape of nanorods with an average length of 32 ± 2.0 and width of 16 ± 1.5 nm. The more stable stannite phase of CCTS has also been synthesized by increasing the reaction temperature or by a post-high-temperature annealing process. The band gap of wurtzite CCTS nanocrystals is determined to be 1.58 eV. Thin films prepared from the nanocrystal suspension display photoresponse behaviour with white light from a solar simulator, suggesting the potential use of CCTS as an active layer in low-cost thin-film solar cells.

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