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Issue 4, 2012
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The photoluminescence of CuInS2 nanocrystals: effect of non-stoichiometry and surface modification

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Abstract

Effects of large copper deficiency and surface modification on the photoluminescence of CuInS2 nanocrystals were explored. The large copper deficiency improved PL intensity due to the enhanced internal defect-related emission. Surface modification of copper deficient nanocrystals by simply refluxing with zinc acetate and fatty acid resulted in more than 10 times improvement in the photoluminescence intensity and a large blueshift of the photoluminescence spectra. The uniformity in size/shape distribution after surface modification was attributed to the origin of shrinkage in Stokes shift from ∼600 meV to ∼300 meV in Cu0.2InS2/ZnS nanocrystals. Furthermore, the contribution of lattice strain to this large blueshift in emission wavelength in Cu0.2InS2/ZnS nanocrystals was proposed and tested with the CdS shell layers. The electronic process underlying the large enhancement of PL intensity was studied with time-resolved and temperature-dependent photoluminescence. This drastically enhanced photoluminescence after surface modification was attributed to the efficient reduction of non-radiative recombination originated from surface trap states, the activation energy of which was estimated to be 85 meV.

Graphical abstract: The photoluminescence of CuInS2 nanocrystals: effect of non-stoichiometry and surface modification

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Publication details

The article was received on 08 Jul 2011, accepted on 02 Nov 2011 and first published on 28 Nov 2011


Article type: Paper
DOI: 10.1039/C1JM13170B
Citation: J. Mater. Chem., 2012,22, 1516-1520
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    The photoluminescence of CuInS2 nanocrystals: effect of non-stoichiometry and surface modification

    Y. Kim, S. Ahn, K. Chung, Y. Cho and C. Choi, J. Mater. Chem., 2012, 22, 1516
    DOI: 10.1039/C1JM13170B

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