Dye-sensitized solar cells based on Fe N-heterocyclic carbene photosensitizers with improved rod-like push-pull functionality
Linnea Lindh, Olga Gordivska, Samuel Persson, Hannes Michaels, Hao Fan, Pavel Chábera, Nils W. Rosemann, Arvind Kumar Gupta, Iacopo Benesperi, Jens Uhlig, Om Prakash, Esmaeil Sheibani, Kasper S. Kjær, Gerrit Boschloo, Arkady Yartsev, Marina Freitag, Reiner Lomoth, Petter Persson, Kenneth Wärnmark
Abstract
back to the oxidized dye, leaving only 5-10% of the initially excited dyes available to contribute to a current in the DSSC. On slower timescales, time-resolved spectroscopy also found that the recombination dynamics (longer than 40 μs) were significantly slower than the regeneration of the oxidized dye by the redox mediator (6-8 μs). Therefore it is the ultrafast recombination down to fs-timescales, between the oxidized dye and the injected electron, that remains as one of the main bottlenecks to be targeted for achieving further improved solar energy conversion efficiencies in future work.