Generally it was found that the use of additives in redox mediator [iodide/triiodide] cause not only improved performance but also increase device stability. In particular, I want to know the impact on the device stability. Can it affect the dye-desorption from TiO2 that has direct impact on the long-term stability of DSSCs?
Yes, some additives do lead to catalytic replacement of NCS, in Ru metal complexes,, in particular. Pls check the reference #45 and 46 in the following publication for possible explanation for your question.
http://pubs.rsc.org/en/Content/ArticleLanding/2014/CP/c4cp04120h#!divCitation
Ionic liquids affect the stability mostly through termal and electrochemical stability and lack of vapor pressure, which allows for better performance especially at higher temperatures.
Thanks for your reply. I can understand the utility of non-volatile solvents to improve the device stability. But what about effect of additives. In general they improve photo-voltage but also they cause better durability. So, how they improve the device stability as most of the reports describe the results only by employing them in different concentrations. There is no clear concept regarding the same.
Hi,
yes, the ionic-liquid based electrolytes is affected on the electrochemical stability of electrolyte and enhance the performance of DSSC.
Regards,
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