Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
In dye-sensitized solar cells, dye-cations are formed by photo-excited electron injection from dyes to metal oxide electrode. The dye cations are ideally reduced by oxidized species of redox couple in electrolyte solutions. To reduce the dye cations by the species but not by the injected electrons, typically dyes are designed so that the difference between the dye’s HOMO level and electrolyte’s redox potential becomes more than 0.4 eV. However, the difference is desired to be decreased to obtain higher open circuit voltage. In order to reduce the difference, we need to understand the factors influencing the reduction rate and their mechanisms. However, not all factors have been revealed yet. Here, we measured the reduction rate for several dyes whose structures are systematically varied. For the effect of alkyl chains attached on the dyes, we previously postulated that the alkyl chains affected the reduction rate by changing the dye adsorption angle on the electrode. However, we found inconsistent data to the postulate. We also studied the effect of the structure of donor parts on the reduction rate and found the structures reducing the reduction rate for injected electrons. We will discuss how these findings can be applied to design the dyes for highly efficient dye-sensitized solar cells.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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