Key points are not available for this paper at this time.
This paper reports a new coumarin dye, 2-cyano-3- (5-2-5- (1, 1, 6, 6-tetramethyl-10-oxo-2, 3, 5, 6-tetrahydro- 1H, 4H, 10H -11-oxa-3a-aza-benzo[ de anthracen -9-yl) -thiophen-2-yl]-vinyl-thiophen-2-yl) -acrylic acid (NKX-2700), and its application in dye-sensitized solar cells (DSSCs). Under illumination of simulated AM1. 5G solar light (100 mW cm -2) with an aperture black mask, 5. 0% of power conversion efficiency short-circuit photocurrent density (J sc) = 12. 0 mA cm -2, open-circuit photovoltage (V oc) = 0. 59 V, and fill factor (FF) = 0. 71 was obtained for NKX-2700 based DSSC, which was significantly improved to 8. 2% (J sc = 15. 9 mA cm -2, V oc = 0. 69 V, FF = 0. 75) upon addition of 120 mM deoxycholic acid (DCA) to the dye solution for TiO 2 sensitization. Coadsorption of DCA decreased dye coverage by ∼50% but significantly improved the J sc by 33%. The breakup of π-stacked aggregates might improve electron injection yield and thus J sc. Electrochemical impedance data indicate that the electron lifetime was improved by coadsorption of DCA, accounting for the significant improvement of V oc. These results suggest that interfacial engineering of the organic dye-sensitized TiO 2 electrodes is important for highly efficient photovoltaic performance of the solar cell.
Wang et al. (2007) studied this question.