Controlling surface defects of non-stoichiometric copper-indium-sulfide quantum dots

Journal of Colloid and Interface Science
Jae Chul Park, Yoon Sung Nam

Abstract

Quantum dots (QDs) can be used for a wide range of practical applications including solar energy conversion, light-emitting display, bio-imaging, and sensing. However, toxic heavy metal elements of Pb- and Cd-based QDs cause potential environmental problems and limit their wide applicability. To overcome this limitation, CuInS2 (CIS) QDs, which have a bulk bandgap energy of 1.5eV and relatively high absorptivity, can be a good alternative. However the photoluminescence quantum yield (PLQY) of CIS QDs is too low for practical applications. Here we investigate the effects of experimental factors in the solution synthesis of CIS/ZnS QDs on intrinsic defects and surface defects from photoluminescence (PL) analysis. A heating-up method is used with dodecanethiol as a sulfur source, a ligand, and a medium. The Cu-to-In feeding ratio is changed to control the PL spectrum in the range of visible to near infrared (NIR) frequencies. The PLQY is increased above 40% in all of the ranges through ZnS shell passivation and additional process optimization (e.g., controlled cooling rate and additional feeding of In(3+) ion precursor). This work demonstrates the role of intrinsic defects in PL and the importance of suppressing the formation of t...Continue Reading

References

Apr 10, 2008·Journal of the American Chemical Society·Daocheng PanYunfeng Lu
May 23, 2008·Advanced Drug Delivery Reviews·Andrew M SmithShuming Nie
Dec 3, 2008·The Journal of Chemical Physics·Masato UeharaHideaki Maeda
Jun 15, 2011·Journal of Colloid and Interface Science·Da-Eun NamHeesun Yang
Jun 29, 2013·Inorganic Chemistry·Yanyan ChenDaocheng Pan
Aug 6, 2013·ACS Applied Materials & Interfaces·Wei-Wei XiongJun-Jie Zhu
Nov 6, 2013·ACS Applied Materials & Interfaces·Joanna Kolny-Olesiak, Horst Weller

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Citations

Apr 11, 2017·Chemical Reviews·Claudia CoughlanKevin M Ryan
Aug 29, 2019·ACS Applied Materials & Interfaces·Jae Chul ParkYoon Sung Nam

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