Radiative and Nonradiative Recombination in CuInS2 Nanocrystals and CuInS2-Based Core/Shell Nanocrystals

Journal Article (2016)
Author(s)

Anne C. Berends (Universiteit Utrecht)

Freddy T. Rabouw (Universiteit Utrecht)

Frank Spoor (TU Delft - ChemE/Opto-electronic Materials)

Eva Bladt (Universiteit Antwerpen)

F.C. Grozema (TU Delft - ChemE/Opto-electronic Materials)

Arjan Houtepen (TU Delft - ChemE/Opto-electronic Materials)

Laurens D A Siebbeles (TU Delft - ChemE/Opto-electronic Materials)

Celso De Mello Donegá (Universiteit Utrecht)

Research Group
ChemE/Opto-electronic Materials
Copyright
© 2016 Anne C. Berends, Freddy T. Rabouw, F.C.M. Spoor, Eva Bladt, F.C. Grozema, A.J. Houtepen, L.D.A. Siebbeles, Celso De Mello Donegá
DOI related publication
https://doi.org/10.1021/acs.jpclett.6b01668
More Info
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Publication Year
2016
Language
English
Copyright
© 2016 Anne C. Berends, Freddy T. Rabouw, F.C.M. Spoor, Eva Bladt, F.C. Grozema, A.J. Houtepen, L.D.A. Siebbeles, Celso De Mello Donegá
Research Group
ChemE/Opto-electronic Materials
Issue number
17
Volume number
7
Pages (from-to)
3503-3509
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Abstract

Luminescent copper indium sulfide (CIS) nanocrystals are a potential solution to the toxicity issues associated with Cd- and Pb-based nanocrystals. However, the development of high-quality CIS nanocrystals has been complicated by insufficient knowledge of the electronic structure and of the factors that lead to luminescence quenching. Here we investigate the exciton decay pathways in CIS nanocrystals using time-resolved photoluminescence and transient absorption spectroscopy. Core-only CIS nanocrystals with low quantum yield are compared to core/shell nanocrystals (CIS/ZnS and CIS/CdS) with higher quantum yield. Our measurements support the model of photoluminescence by radiative recombination of a conduction band electron with a localized hole. Moreover, we find that photoluminescence quenching in low-quantum-yield nanocrystals involves initially uncoupled decay pathways for the electron and hole. The electron decay pathway determines whether the exciton recombines radiatively or nonradiatively. The development of high-quality CIS nanocrystals should therefore focus on the elimination of electron traps.

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