Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
The addition of a small electron donor (tris(p-anisyl)amine, TPAA) to cobalt bipyridine redox electrolyte can lead to significant improvement of the performance dye-sensitized solar cells (DSC) [1]. Here, we investigate the addition of TPAA to traditional iodide/triiodide electrolytes for DSCs. When using 3-methoxy proprionitrile (MPN) as non-volatile solvent for the electrolyte and the organic dye LEG4 as sensitizer, a power conversion efficiency (PCE) of 4.3% is obtained for the I-/I3- electrolyte, which improved to 5.7% upon addition of 0.1 M TPAA, due to small increases in voltage, photocurrent and fill factor. In contrast, using the ruthenium dye N719 as sensitizer, a slight decrease in PCE was found upon TPAA addition, from 5.0 to 4.7 %, due to a decrease in open-circuit potential.
Ultrafast dye regeneration takes place when TPAA is present in the electrolyte [1]. Using nanosecond transient absorption spectroscopy (ns-TAS) it is shown that this leads to the formation of TPAA+, which is subsequently reduced by iodide under the formation of the diodide radical, I2-. The latter is a rather slow process, 28 µs, which is due to the very low driving force in the reaction TPAA+ + 2 I- = TPAA + I2-.
The reason for the decreased performance of N719 in the presence of TPAA is the recombination between electrons in TiO2 and TPAA+, which is not sufficiently blocked by the dye, in contrast to LEG4.
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