Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance upgrade on Thursday 4th of May 2017 from 8.00am to 9.00am (BST).

During this time our websites will be offline temporarily. If you have any questions please use the feedback button on this page. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 42, 2016
Previous Article Next Article

Ultrafast multiexponential electron injection dynamics at a dye and ZnO QD interface: a combined spectroscopic and first principles study

Author affiliations

Abstract

The photophysical properties of a push–pull dye and the dynamics of electron transfer across a dye and ZnO quantum dot (QD) interface have been studied using a combination of steady-state, time-resolved fluorescence and femtosecond transient absorption (TA) spectroscopies. Spectroscopic measurements, along with quantum chemical calculations, provide evidence for the photoinduced intramolecular charge transfer (ICT) in a donor–π–acceptor dye. Wavelength dependent fluorescence decay of the dye infers the solvent relaxation of the ICT state. TA spectral measurements suggest electron transfer from dye to ZnO QD through the ICT state by monitoring the dye radical cation. Multiexponential electron injection with time constants of 775 fs and 25 ps at the dye@QD interface is demonstrated using the TA kinetics results. The thermodynamics of fast and slow electron injections is discussed. Furthermore, density functional theory (DFT) and time-dependent (TD)-DFT simulations were performed to identify the dye cation radical and to get a deep insight into the experimental observations.

Graphical abstract: Ultrafast multiexponential electron injection dynamics at a dye and ZnO QD interface: a combined spectroscopic and first principles study

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 01 Jul 2016, accepted on 28 Sep 2016 and first published on 30 Sep 2016


Article type: Paper
DOI: 10.1039/C6CP04610J
Citation: Phys. Chem. Chem. Phys., 2016,18, 29571-29581
  •   Request permissions

    Ultrafast multiexponential electron injection dynamics at a dye and ZnO QD interface: a combined spectroscopic and first principles study

    P. Kumar and S. K. Pal, Phys. Chem. Chem. Phys., 2016, 18, 29571
    DOI: 10.1039/C6CP04610J

Search articles by author