Synthesis of cadmium-free quantum dots based on CuInS2 nanocrystals

Anastasiya S. Novikova; Valentina V. Goftman; Irina Y. Goryacheva

doi:10.1117/12.2229852

21 April 2016 Synthesis of cadmium-free quantum dots based on CuInS₂ nanocrystals

Anastasiya S. Novikova, Valentina V. Goftman, Irina Y. Goryacheva

Proceedings Volume 9917, Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS); 991714 (2016) https://doi.org/10.1117/12.2229852
Event: Saratov Fall Meeting 2015, 2015, Saratov, Russian Federation

Abstract

We report an efficient synthesis Cd-free CuInS₂/ZnS (CIS/ZnS) quantum dots (QDs) using low toxic precursors and investigation of their optical properties. The nanocrystals have been obtained via reaction between the acetate salts of the corresponding metals and elemental sulfur in the presence of dodecanethiol in octadecene media at 220°C. Influence of various experimental variables, including temperature, time, ratio of Cu and In precursors were investigated. Thus, it was shown that the photoluminescence (PL) emission wavelength can be tuned by conveniently changing the stoichiometric ratio of the components. The plain CIS nanocrystals did show PL emission but with quite low PL quantum yield (QY). In order to increase the QY of QD luminescence by compensation of the surface defects of QDs cores, the process of covering with ZnS shells was done. During shelling process, increasing of QY and blue shift of emission maximum were detected.

Citation Download Citation

Anastasiya S. Novikova, Valentina V. Goftman, and Irina Y. Goryacheva "Synthesis of cadmium-free quantum dots based on CuInS₂ nanocrystals", Proc. SPIE 9917, Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS), 991714 (21 April 2016); https://doi.org/10.1117/12.2229852

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