Phase dependent visible to near-infrared photoluminescence of CuInS2 nanocrystals

A. D. P. Leach; L. G. Mast; E. A. Hernández-Pagán; J. E. Macdonald

doi:10.1039/C5TC00134J

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Phase dependent visible to near-infrared photoluminescence of CuInS₂ nanocrystals†

A. D. P. Leach,^a L. G. Mast,^a E. A. Hernández-Pagán^a and J. E. Macdonald*^a

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* Corresponding authors

^a Department of Chemistry and the Vanderbilt Institute of Nanoscale Science and Engineering, Vanderbilt University, Nashville, Tennessee, USA
E-mail: janet.macdonald@vanderbilt.edu

Abstract

Nanocrystals of CuInS₂ with the hexagonal wurtzite structure hold great potential for applications requiring efficient energy transport, such as photocatalysis, due to their anisotropic crystal structure. However, thus far their optical properties have proven difficult to study, as luminescence from wurtzite nanocrystals has only recently been observed. In this work, we report the colloidal synthesis of single crystalline, luminescent CuInS₂ nanocrystals with both the cubic and hexagonal structures. The crystalline phase, optical properties and mechanism of formation of nanocrystals are controlled by changing the reaction temperature. Photoluminescence is observed in the visible and near-infrared spectral regions, which results from the cubic and hexagonal nanocrystals respectively. Synthetic studies combined with XRD, TEM and EDS mapping provide evidence for the mechanisms behind phase selection.

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Article information

DOI: https://doi.org/10.1039/C5TC00134J
Article type: Paper
Submitted: 14 Jan 2015
Accepted: 06 Feb 2015
First published: 06 Feb 2015
This article is Open Access

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J. Mater. Chem. C, 2015,3, 3258-3265

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Phase dependent visible to near-infrared photoluminescence of CuInS₂ nanocrystals

A. D. P. Leach, L. G. Mast, E. A. Hernández-Pagán and J. E. Macdonald, J. Mater. Chem. C, 2015, 3, 3258 DOI: 10.1039/C5TC00134J

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Journal of Materials Chemistry C