By a News Reporter-Staff News Editor at Physics Week -- Current study results on Electrolytes have been published. According to news reporting originating from Atlanta, Georgia, by VerticalNews correspondents, research stated, "In quantum dot (QD) sensitized solar cells (QDSSCs), redox electrolytes act as hole scavengers to regenerate the QD ground state from its oxidized form, thus enabling a continuous device operation. However, unlike molecular sensitizers, QDs also have redox-active trap states within the band gap, which can be charged in the presence of redox electrolyte."
Our news editors obtained a quote from the research from Emory University, "The effects of electrolyte induced charging of QDs on the performance of QDSSCs have not been reported. Here, using steady-state and time-resolved absorption and emission spectroscopy, we show that CdSe/CdS3MLZnCdS2MLZnS2ML core/multishell QDs are charged in the presence of sulfide electrolytes due to the reduction of surface states. As a result, exciton lifetimes in these QDs are shortened due to an Auger recombination process. Such charging induced fast Auger recombination can compete effectively with electron transfer from QDs to TiO2 and reduce the electron injection efficiency in QDSSCs."
According to the news editors, the research concluded: "We believe that the reported charging effects are present for most colloidal nanocrystals in the presence of redox media and have important implications for designing QD-based photovoltaic and photocatalytic devices."
For more information on this research see: Charging of Quantum Dots by Sulfide Redox Electrolytes Reduces Electron Injection Efficiency in Quantum Dot Sensitized Solar Cells. Journal of the American Chemical Society, 2013;135(31):11461-11464. Journal of the American Chemical Society can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of the American Chemical Society - www.pubs.acs.org/journal/jacsat)
The news editors report that additional information may be obtained by contacting H.M. Zhu, Emory University, Dept. of Chem, Atlanta, GA 30322, United States. Additional authors for this research include N.H. Song and T.Q. Lian.
Keywords for this news article include: Atlanta, Georgia, Electrolytes, Quantum Dots, United States, Nanotechnology, Quantum Physics, Inorganic Chemicals, Emerging Technologies, North and Central America
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