期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 26, 页码 16760-16766出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp01652e
关键词
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资金
- 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)
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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