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Issue 26, 2015

Ultrafast charge carrier relaxation and charge transfer processes in CdS/CdTe thin films

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Abstract

Ultrafast transient absorption pump–probe spectroscopy (TAPPS) has been employed to investigate charge carrier relaxation in cadmium sulfide/cadmium telluride (CdS/CdTe) nanoparticle (NP)-based thin films and electron transfer (ET) processes between CdTe and CdS. Effects of post-growth annealing treatments to ET processes have been investigated by carrying out TAPPS experiments on three CdS/CdTe samples: as deposited, heat treated, and CdCl2 treated. Clear evidence of ET process in the treated thin films has been observed by comparing transient absorption (TA) spectra of CdS/CdTe thin films to those of CdS and CdTe. Quantitative comparison between ultrafast kinetics at different probe wavelengths unravels the ET processes and enables determination of its rate constants. Implication of the photoinduced dynamics to photovoltaic devices is discussed.

Graphical abstract: Ultrafast charge carrier relaxation and charge transfer processes in CdS/CdTe thin films

Supplementary files

Article information


Submitted
21 Mar 2015
Accepted
21 May 2015
First published
27 May 2015

Phys. Chem. Chem. Phys., 2015,17, 16760-16766
Article type
Paper
Author version available

Ultrafast charge carrier relaxation and charge transfer processes in CdS/CdTe thin films

B. Pandit, R. Dharmadasa, I. M. Dharmadasa, T. Druffel and J. Liu, Phys. Chem. Chem. Phys., 2015, 17, 16760 DOI: 10.1039/C5CP01652E

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