We are seeing reports of such kind of recombination for organic sensitizer, but I was wondering if something similar exists or being studied for Ru (II) sensitizers?
Yes, back electron transfer is common and very well explored in case of ruthenium sensitizers. You can refer to - http://pubs.acs.org.sci-hub.cc/doi/abs/10.1021/ja0460357
Dipak thanks for sharing your thoughts. Just to make sure, we are on same page, in the reference you shared they are talking about recombinations without claiming it as back electron to oxidized sensitizer, though it is a possibility as they mentioned.
In very poular, ACS review by Hagfeldt (http://pubs.acs.org/doi/abs/10.1021/cr900356p?journalCode=chreay) they mentioned it is slower (microsecond range() compared to recombination with electrolyte (millisecond range). Whereas in some recent reports for organic dyes this back electron transfer has been reported to be faster than with electrolyte. Which make sense based on how Ru (II) vs. organic dyes orient on TiO2 surface.
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