Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Adding a coadsorbent such as chenodeoxycholic acid (CDCA) is a commonly used procedure to prevent dye aggregation and improve the sunlight conversion efficiency in dye sensitized solar cells (DSSC). However, the detailed influence of aggregation effect on charge separation dynamics in DSSC is still not very well understood. Therefore, we performed time-resolved absorption and emission spectroscopic studies for two kinds of dyes to reveal the influence of CDCA on the photobehavior of complete cells in the ultrafast time scale when the electron injection takes place.
First, we studied complete solar cells sensitized with a near infrared absorbing dye (HY103) used for tandem DSSC [1]. Our stationary absorption spectroscopic studies show the presence of monomers with an absorption band at 650 nm and H-aggregates with an absorption at 600 nm [2]. Their relative concentration depends on the presence of coadsorbent.
For the most efficient electrolyte, the electron injection rate constants are 0.21 1/ps-1 from monomers and 0.07 ps-1 from H-aggregates [2]. An important and novel finding is revealed which is energy transfer from S1 state of monomer to lower exciton band of H-aggregate (with rate constants from 0.04 ps-1 to 0.25 ps-1). Moreover, a decrease of internal conversion rate in HY103 attached to the nanoparticles (0.01 ps-1) with respect to that of free dye in solution (0.06 ps-1) is observed. We believe that the studies of HY103 dye are representative for a large class of dyes for solar cells that tend to form H-aggregates, like porphyrins and squaraines.
Second, our results for indoline D149 dye will be shown. In this case we found no influence of the coadsorbent (used in the same amount as that for HY103) on the stationary absorption spectrum of the sensitized solar cells. The ultrafast transient absorption studies of the coadsorbent effect on D149-sensitized cells in visible and near infrared spectral range will be also presented.
Acknowledgements
This work was supported by NCN (National Science Centre in Poland) project 2012/05/B/ST3/03284, MNiSzW (Ministry of Science and High Education, Poland) project 6364/IA/128/213 and MINECO project PLE2009-0015.
The deactivation paths in solar cells sensitized with HY103 dye.
[1] Li, L; Hao, Y.; Yang, X., Zhao, J; Tian, H; Teng, C.: Hagfeldt, A., Sun, L. A Double-Band Tandem Organic Dye-sensitized Solar Cell with an Efficiency of 11.5%. ChemSusChem 2011, 4, 609-612. [2] Ziółek, M.; Karolczak, J.; Zalas, M.; Hao, Y.; Tian, H; Douhal, A.; Aggregation and Electrolyte Composition Effects on the Efficiency of Dye-Sensitized Solar Cells. A Case of a Near-Infrared Absorbing Dye for Tandem Cells, J. Phys. Chem. C, 2014, 118, 194-205.
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