Growth of Multinary Copper-Based Sulfide Shells on CuInSeNanocrystals for Significant Improvement of Their Near-Infrared Emission

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Jiajia Ning
  • Fei Huang
  • Stephen V. Kershaw

Detail(s)

Original languageEnglish
Pages (from-to)7842–7849
Journal / PublicationChemistry of Materials
Volume32
Issue number18
Online published31 Aug 2020
Publication statusPublished - 22 Sep 2020

Abstract

A range of different copper-based sulfide shells, such as CuInS2, CuInZnS2, CuInS2-xSex, and CuInZnS2-xSex, have been grown on CuInSe2 (CISe) nanocrystals (NCs) in order to improve their photoluminescence quantum yield (PLQY). Starting from initial CISe core NCs with PLQY of 0.4%, the deposition of the CuInS2 shell has increased the PLQY to 4.5%, while introducing Zn or Se elements into the CuInS2 shell to form cation-alloyed CuInZnS2 or anion-alloyed CuInS2-xSex shells improved their PLQYs to 8% and 11%, respectively. Limitations on PLQY for the mentioned shell materials were related to the lattice mismatch with the CISe core material, and the band gap alignment in the core/shell NCs for quasi type-II nanostructures. This could be mitigated by growing a multinary CuInZnS2-xSex shell on the CISe core NCs, which resulted in further improvement of their PLQY to 20% for the emission centered at 920 nm. This study offers guidance for the rational selection of copper-based sulfide shell materials that are able to significantly improve the PLQY of heavy-metal free CISe NCs in the near-infrared spectral range of 834-1028 nm, which is relevant for biological labeling, optoelectronics, and sensing.

Citation Format(s)

Growth of Multinary Copper-Based Sulfide Shells on CuInSeNanocrystals for Significant Improvement of Their Near-Infrared Emission. / Ning, Jiajia; Xiong, Yuan; Huang, Fei; Duan, Zonghui; Kershaw, Stephen V.; Rogach, Andrey L.

In: Chemistry of Materials, Vol. 32, No. 18, 22.09.2020, p. 7842–7849.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review