Ultrafast charge dynamics in trap-free and surface-trapping colloidal quantum dots

Smith, CT, Leontiadou, M ORCID: https://orcid.org/0000-0003-2616-1841, Page, R, O'Brien, P and Binks, DJ 2015, 'Ultrafast charge dynamics in trap-free and surface-trapping colloidal quantum dots' , Advanced Science, 2 (10) , p. 1500088.

[img]
Preview
PDF (Original paper) - Published Version
Available under License Creative Commons Attribution 4.0.

Download (362kB) | Preview
[img]
Preview
PDF (Corrected abstract) - Published Version
Available under License Creative Commons Attribution 4.0.

Download (74kB) | Preview
Access Information: The correction to the original publication (https://doi.org/10.1002/advs.201500088) was published online on 13th July 2016.

Abstract

Ultrafast transient absorption spectroscopy is used to study subnanosecond charge dynamics in CdTe colloidal quantum dots. After treatment with chloride ions, these can become free of surface traps that produce nonradiative recombination. A comparison between these dots and the same dots before treatment enables new insights into the effect of surface trapping on ultrafast charge dynamics. The surface traps typically increase the rate of electron cooling by 70% and introduce a recombination pathway that depopulates the conduction band minimum of single excitons on a subnanosecond timescale, regardless of whether the sample is stirred or flowed. It is also shown that surface trapping significantly reduces the peak bleach obtained for a particular pump fluence, which has important implications for the interpretation of transient absorption data, including the estimation of absorption cross‐sections and multiple exciton generation yields.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Advanced Science
Publisher: Wiley
ISSN: 2198-3844
Related URLs:
Funders: Engineering and Physical Sciences Research Council (EPSRC)
Depositing User: Dr MARINA LEONTIADOU
Date Deposited: 02 Apr 2019 08:05
Last Modified: 02 Apr 2019 08:15
URI: http://usir.salford.ac.uk/id/eprint/50831

Actions (login required)

Edit record (repository staff only) Edit record (repository staff only)

Downloads

Downloads per month over past year