Abstract
Herein, we present the effect of ground-state complexation between organic photosensitizers and the utilized electrolyte in dye-sensitized solar cells. To do so, we selected a well-known standard o...
Highlights
In typical dye-sensitized solar cells (DSSCs), an electrolyte is used to provide an electron to the oxidized adsorbed dye after electron injection.[1]
It is theoretically expected that the arrangements of adsorbed organic dyes such as D149 will be perpendicular on semiconductor surfaces.[5]
We focused on the D149 dye from the indoline family as it was one of the best performing organic dye in DSSCs.[21,22]
Summary
In typical dye-sensitized solar cells (DSSCs), an electrolyte is used to provide an electron to the oxidized adsorbed dye after electron injection.[1]. The iodide electrolyte has some disadvantages such as its corrosive nature, it has a slow recombination process between the injected electrons in the conduction bands of TiO2 and the oxidized species of the electrolyte.[1,4] Several chemical interactions occur in DSSCs, such as deprotontion and adsorption of the photosensitizer on semicondutor surfaces.[5] It is theoretically expected that the arrangements of adsorbed organic dyes such as D149 will be perpendicular on semiconductor surfaces.[5] complexation of adsorbed dyes with the electrolyte components is expected to affect the electron dynamics on faster time scales. Formation of new complex species between the adsorbed dyes in DSSCs and the electrolyte components has been discussed before, especially with the iodine.[6] all of these previous studies showed/expected only an influence on the charge recombination or charge regeneration processes in the nano/microsecond time scale. Despite the low concentration of I2 in the electrolyte composition, it was found that the recombination to I2 happened rather than to I3−.11,12 it was found that the binding of I2 to dyes with sulfur atoms or amino groups increased the recombination rate.[2,6] All of these previous studies illustrated formation of Received: April 18, 2020 Revised: June 3, 2020 Published: June 3, 2020
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