Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 26, Pages 16760-16766Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp01652e
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Funding
- Department of Energy via its EPSCoR grant [DE-FG02-07ER46375]
- University of Louisville
- U.S. Department of Energy (DOE) [DE-FG02-07ER46375] Funding Source: U.S. Department of Energy (DOE)
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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.
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