Espinobarro-Velazquez, D, Leontiadou, MA, Page, RC et al. (3 more authors) (2015) Effect of chloride passivation on recombination dynamics in cdte colloidal quantum dots. ChemPhysChem. ISSN 1439-4235
Abstract
Colloidal quantum dots (CQDs) can be used in conjunction with organic charge-transporting layers to produce light-emitting diodes, solar cells and other devices. The efficacy of CQDs in these applications is reduced by the non-radiative recombination associated with surface traps. Here we investigate the effect on the recombination dynamics in CdTe CQDs of the passivation of these surface traps by chloride ions. Radiative recombination dominates in these passivated CQDs, with the radiative lifetime scaling linearly with CQD volume over τr=20-55ns. Before chloride passivation or after exposure to air, two non-radiative components are also observed in the recombination transients, with sample-dependent lifetimes typically of less than 1ns and a few ns. The non-radiative dynamics can be explained by Auger-mediated trapping of holes and the lifetimes of this process calculated by an atomistic model are in agreement with experimental values if assuming surface oxidation of the CQDs.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2015 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Chloride; nanoparticles; passivation; photoluminescence; quantum dots |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Mar 2015 14:06 |
Last Modified: | 26 Mar 2015 14:06 |
Published Version: | http://dx.doi.org/10.1002/cphc.201402753 |
Status: | Published |
Publisher: | Wiley-VCH Verlag |
Identification Number: | 10.1002/cphc.201402753 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:83800 |