Photoluminescence of CuInS2 nanocrystals: effect of surface modification

Young-Kuk Kim; Young-Sang Cho; Kookchae Chung; Chul-Jin Choi

doi:10.1117/12.891504

7 September 2011 Photoluminescence of CuInS₂ nanocrystals: effect of surface modification

Young-Kuk Kim, Young-Sang Cho, Kookchae Chung, Chul-Jin Choi

Proceedings Volume 8094, Nanophotonic Materials VIII; 80940I (2011) https://doi.org/10.1117/12.891504
Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States

Abstract

We have synthesized highly luminescent Cu-In-S(CIS) nanocrystals (NCs) by heating the mixture of metal carboxylates and alkylthiol under inert atmosphere. We modified the surface of CIS NCs with zinc carboxylate and subsequent injection of alkylthiol. As a result of the surface modification, highly luminescent CIS@ZnS core/shell nanocrystals were synthesized. The luminescence quantum yield (QY) of best CIS@ZnS NCs was above 50%, which is 10 times higher than the initial QY of CIS NCs before surface modification (QY=3%). Detailed study on the luminescence mechanism implies that etching of the surface of NCs by dissociated carboxylate group (CH3COO-) and formation of epitaxial shell by Zn with sulfur from alkylthiol efficiently removed the surface defects which are known to be major non-radiative recombination sites in semiconductor nanocrystals. In this study, we developed a novel surface modification route for monodispersed highly luminescent Cu-In-S NCs with less toxic and highly stable precursors. Investigation with the timeand the temperature-dependent photoluminescence showed that the trap related emission was minimized by surface modification and the donor-acceptor pair recombination was enhanced by controlling copper stoichiometry.xb

Citation Download Citation

Young-Kuk Kim, Young-Sang Cho, Kookchae Chung, and Chul-Jin Choi "Photoluminescence of CuInS₂ nanocrystals: effect of surface modification", Proc. SPIE 8094, Nanophotonic Materials VIII, 80940I (7 September 2011); https://doi.org/10.1117/12.891504

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