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Nanomaterials 2018, 8(6), 405; https://doi.org/10.3390/nano8060405

Facile and Robust Solvothermal Synthesis of Nanocrystalline CuInS2 Thin Films

1
Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
2
Ludwig-Maximilians-Universität, Butenandtstraße 5-11, 81377 Munich, Germany
3
Materials Analytics, RWTH Aachen University, Kopernikusstraße 10, 52074 Aachen, Germany
*
Author to whom correspondence should be addressed.
Received: 7 May 2018 / Revised: 29 May 2018 / Accepted: 30 May 2018 / Published: 5 June 2018
(This article belongs to the Special Issue Green Synthesis of Nanomaterials)
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Abstract

This work demonstrates that the solvothermal synthesis of nanocrystalline CuInS2 thin films using the amino acid l-cysteine as sulfur source is facile and robust against variation of reaction time and temperature. Synthesis was carried out in a reaction time range of 3–48 h (at 150 °C) and a reaction temperature range of 100–190 °C (for 18 h). It was found that at least a time of 6 h and a temperature of 140 °C is needed to produce pure nanocrystalline CuInS2 thin films as proven by X-ray and electron diffraction, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Using UV-vis spectroscopy, a good absorption behavior as well as direct band gaps between 1.46 and 1.55 eV have been determined for all grown films. Only for a reaction time of 3 h and temperatures below 140 °C CuInS2 is not formed. This is attributed to the formation of metal ion complexes with l-cysteine and the overall slow assembly of CuInS2. This study reveals that the reaction parameters can be chosen relatively free; the reaction is completely nontoxic and precursors and solvents are rather cheap, which makes this synthesis route interesting for industrial up scaling. View Full-Text
Keywords: solvothermal synthesis; CuInS2; TEM solvothermal synthesis; CuInS2; TEM
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Frank, A.; Grunwald, J.; Breitbach, B.; Scheu, C. Facile and Robust Solvothermal Synthesis of Nanocrystalline CuInS2 Thin Films. Nanomaterials 2018, 8, 405.

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