Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
A triphenylamine dye LEG4 was used for the first time in combination with TEMPO based electrolyte in dye sensitized solar cell (DSSC), and a comparison is made with a previously studied indoline dye D149. Diffusion length, charge extraction, electron lifetime and transient absorption spectrum measurements were used to characterize these systems in order to get insight about their limitation and potential.
Surprisingly, the diffusion length of both D149- and LEG4-sensitized tempo solar cells was approximately the same: 0.5 μm, much smaller than that found in cobalt based electrolyte (2.8 μm). The better performance by LEG4 in TEMPO-DSSC is not due to electron lifetime (as in cobalt electrolyte), but to better regeneration efficiency, as high as 87% regeneration efficiency with only 0.14 V driving force in this system, compared to only 68% regeneration efficiency but 0.26 V driving force for D149.
This finding demonstrates a great potential for improvement of DSSC performance based on the triphenylamine –TEMPO system without much loss in energy during dye regeneration. With same amount of lithium concentration in the system, a power conversion efficiency as high as 5.4% efficiency was achieved by TEMPO based cells using only 4 μm TiO2 transparent film with LEG4 as sensitizer, which is comparable to cobalt electrolyte under the same condition.
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