Abstract
The highlight of this work is the synthesis of copper sulfide nanocrystals by a simple one-pot colloidal process, and the study of its electrochemical, electrical and morphological properties. Nanocrystals of Cu18S of about 15-30 nm were obtained at a temperature of 240°C under an argon atmosphere. The colloidal solution of the nanocrystals was analyzed by cyclic voltammetry. Agreeing to the values of EOx and ERedvs. SCE, and the average of three samples the HOMO and LUMO levels are 6.16 and 4.27 eV, respectively, the calculated HOMO–LUMO (Eg) is 1.89 eV. The Eg value, differs of that value obtained from Kubelka-Munk equation (1.7 eV). The photocurrent vs. time results showed that the Cu18S/Cu junction is photosensitive and could be used as absorbing material. The morphology and the topography of the film were analyzed by SEM and AFM techniques. Irregular agglomeration of nanocrystals was observed and a roughness of about 194 nm.
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Acknowledgments
This work was financed by CONACyT-México (CB176450, CB154787) and SENER-CONACyT (CeMIE-Sol project No. 27). The authors are grateful for the technical support received from Gildardo Casarrubias, Rogelio Morán (IER-UNAM), Maria Luisa Ramon (IER-UNAM), Lourdes Palma (INB-UNAM) and Marina Vega-González (CGEO-UNAM).
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Arenas-Arrocena, M., Baray-Calderón, A., Galindo, R. et al. Colloidal copper sulfide nanocrystals: Electrochemical, electrical and morphological properties. MRS Online Proceedings Library 1748, 51–56 (2014). https://doi.org/10.1557/opl.2015.441
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DOI: https://doi.org/10.1557/opl.2015.441