Print Email Facebook Twitter Radiative and Nonradiative Recombination in CuInS2 Nanocrystals and CuInS2-Based Core/Shell Nanocrystals Title Radiative and Nonradiative Recombination in CuInS2 Nanocrystals and CuInS2-Based Core/Shell Nanocrystals Author Berends, Anne C. (Universiteit Utrecht) Rabouw, Freddy T. (Universiteit Utrecht) Spoor, F.C.M. (TU Delft ChemE/Opto-electronic Materials) Bladt, Eva (Universiteit Antwerpen) Grozema, F.C. (TU Delft ChemE/Opto-electronic Materials) Houtepen, A.J. (TU Delft ChemE/Opto-electronic Materials) Siebbeles, L.D.A. (TU Delft ChemE/Opto-electronic Materials) De Mello Donegá, Celso (Universiteit Utrecht) Date 2016-08-23 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. To reference this document use: http://resolver.tudelft.nl/uuid:5b3cfc28-bae7-4e97-8912-c659cf950d2f DOI https://doi.org/10.1021/acs.jpclett.6b01668 ISSN 1948-7185 Source The Journal of Physical Chemistry Letters, 7 (17), 3503-3509 Part of collection Institutional Repository Document type journal article Rights © 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 Files PDF acs.jpclett.6b01668.pdf 2.32 MB Close viewer /islandora/object/uuid:5b3cfc28-bae7-4e97-8912-c659cf950d2f/datastream/OBJ/view