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Energy transfer in aggregated CuInS2/ZnS core-shell quantum dots deposited as solid films

Energy transfer in aggregated CuInS2/ZnS core-shell quantum dots deposited as solid films
Energy transfer in aggregated CuInS2/ZnS core-shell quantum dots deposited as solid films

We report on the morphology and optical properties of CuInS2/ZnS core-shell quantum dots in solid films by means of AFM, SEM, HRTEM, steady state and time-resolved photoluminescence (PL) spectroscopy. The amount of aggregation of the CuInS2/ZnS QDs was controlled by changing the preparation conditions of the films. A red-shift of the PL spectrum of CuInS2/ZnS core-shell quantum dots, deposited as solid films on silicon substrates, is observed upon increasing the amount of aggregation. The presence of larger aggregates was found to lead to a larger PL red-shift. Besides, as the degree of aggregation increased, the PL decay became slower. We attribute the observed PL red-shift to energy transfer from the smaller to the larger dots within the aggregates, with the emission being realized via a long decay recombination mechanism (100-200 ns), the origin of which is discussed.

energy transfer, photoluminescence, semiconductor quantum dots, time resolved photoluminescence
0022-3727
1-9
Gardelis, S.
e1c19249-ca1b-44c3-bb48-3cf76362f388
Fakis, M.
ed01170e-ba9c-48d8-87d3-02a05ad0eff0
Droseros, N.
10fce4dc-a4c7-4271-b721-75141557a9de
Georgiadou, D.
84977176-3678-4fb3-a3dd-2044a49c853b
Travlos, A.
05821891-40c8-4ffa-99e5-b7b0f64acba0
Nassiopoulou, A. G.
3992bced-c01c-49df-9dbb-dcf39acd859b
Gardelis, S.
e1c19249-ca1b-44c3-bb48-3cf76362f388
Fakis, M.
ed01170e-ba9c-48d8-87d3-02a05ad0eff0
Droseros, N.
10fce4dc-a4c7-4271-b721-75141557a9de
Georgiadou, D.
84977176-3678-4fb3-a3dd-2044a49c853b
Travlos, A.
05821891-40c8-4ffa-99e5-b7b0f64acba0
Nassiopoulou, A. G.
3992bced-c01c-49df-9dbb-dcf39acd859b

Gardelis, S., Fakis, M., Droseros, N., Georgiadou, D., Travlos, A. and Nassiopoulou, A. G. (2016) Energy transfer in aggregated CuInS2/ZnS core-shell quantum dots deposited as solid films. Journal of Physics D: Applied Physics, 50 (3), 1-9, [035107]. (doi:10.1088/1361-6463/aa4e5d).

Record type: Article

Abstract

We report on the morphology and optical properties of CuInS2/ZnS core-shell quantum dots in solid films by means of AFM, SEM, HRTEM, steady state and time-resolved photoluminescence (PL) spectroscopy. The amount of aggregation of the CuInS2/ZnS QDs was controlled by changing the preparation conditions of the films. A red-shift of the PL spectrum of CuInS2/ZnS core-shell quantum dots, deposited as solid films on silicon substrates, is observed upon increasing the amount of aggregation. The presence of larger aggregates was found to lead to a larger PL red-shift. Besides, as the degree of aggregation increased, the PL decay became slower. We attribute the observed PL red-shift to energy transfer from the smaller to the larger dots within the aggregates, with the emission being realized via a long decay recombination mechanism (100-200 ns), the origin of which is discussed.

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More information

Accepted/In Press date: 17 November 2016
Published date: 20 December 2016
Keywords: energy transfer, photoluminescence, semiconductor quantum dots, time resolved photoluminescence

Identifiers

Local EPrints ID: 440526
URI: http://eprints.soton.ac.uk/id/eprint/440526
ISSN: 0022-3727
PURE UUID: 0ebe6d03-c621-4509-916a-b5839c826fea
ORCID for D. Georgiadou: ORCID iD orcid.org/0000-0002-2620-3346

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Date deposited: 06 May 2020 16:31
Last modified: 07 Oct 2020 02:27

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Contributors

Author: S. Gardelis
Author: M. Fakis
Author: N. Droseros
Author: D. Georgiadou ORCID iD
Author: A. Travlos
Author: A. G. Nassiopoulou

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