The composition effect on the optical properties of aqueous synthesized Cu-In-S and Zn-Cu-In-S quantum dot nanocrystals

Physical Chemistry Chemical Physics : PCCP
Butian ZhangKen-Tye Yong

Abstract

Multiternary quantum dots (QDs), because of the large degree of freedom in their structure and composition, have a wide tunability in their bandgap but also exhibit an increased uncertainty and complexity in their optical properties. In this work, we synthesized the ternary Cu-In-S (CIS) and quaternary Zn-Cu-In-S (ZCIS) QDs with different composition ratios via a facile aqueous route. The CIS QDs show multi-peak photoluminescence with their peak intensity dependent on the Cu : In ratio, which was illustrated using a donor-acceptor pair recombination process. Upon incorporation of Zn into the CIS QDs under similar conditions, the acquired ZCIS QDs exhibit blue-shifted photoluminescence (PL) spectra with an enhanced emission intensity and a narrowed spectral width (∼100 nm). A comparative study reveals that, reducing the Cu : In ratio in the CIS QDs and increasing the Zn content in the alloyed ZCIS QDs are both feasible strategies for bandgap engineering, although the influences on optical properties of the QDs were different. The XRD and EDX spectra revealed that the widening of the bandgap of the ZCIS QDs was correlated with the alloyed nanostructures and the preferential substitution of Cu by Zn. Compared to the Cu : In ratio ...Continue Reading

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Citations

Sep 23, 2016·Chemical Reviews·Gaixia XuParas N Prasad
Aug 30, 2019·Chemical Society Reviews·Lijiao YangXiaoyuan Chen
Aug 21, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Wubshet Mekonnen GirmaJia-Yaw Chang
May 26, 2018·Chemical Society Reviews·Oleksandr StroyukNikolai Gaponik
Oct 2, 2020·Analytical and Bioanalytical Chemistry·Hongchao GengQingyun Cai
Jul 16, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Giacomo MorselliPaola Ceroni
Nov 5, 2021·Macromolecular Bioscience·Chengbin YangChih-Kuang Chen

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