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Proceedings Paper

Photoluminescence of CuInS2 nanocrystals: effect of surface modification
Author(s): Young-Kuk Kim; Young-Sang Cho; Kookchae Chung; Chul-Jin Choi
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Paper 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

Paper Details

Date Published: 7 September 2011
PDF: 6 pages
Proc. SPIE 8094, Nanophotonic Materials VIII, 80940I (7 September 2011); doi: 10.1117/12.891504
Show Author Affiliations
Young-Kuk Kim, Korea Institute of Materials Science (Korea, Republic of)
Young-Sang Cho, Korea Institute of Materials Science (Korea, Republic of)
Kookchae Chung, Korea Institute of Materials Science (Korea, Republic of)
Chul-Jin Choi, Korea Institute of Materials Science (Korea, Republic of)

Published in SPIE Proceedings Vol. 8094:
Nanophotonic Materials VIII
Stefano Cabrini; Taleb Mokari, Editor(s)

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