Torres, EricaSequeira, S.Parreira, P.Mendes, PauloSilva, Tiago J. L.Lobato, KillianBrites, Maria João2016-03-222016-03-222015Torres, E.; Sequeira, S.; Parreira, P.; [et.al.]. - Coumarin dye with ethynyl group as p-spacer unit for dye sensitized solar cells. In: Journal of Photochemistry and Photobiology A: Chemistry, 2015, Vol. 310, p. 1-81010-6030http://hdl.handle.net/10400.9/2894C1-LEN coumarin dye, containing an ethynyl conjugated bridge was tested as a new chromophore for dye-sensitized solar cells (DSSCs). Investigation on the relationship of dye structure, optical properties, electrochemical properties and performance of DSSCs is described. The C1-LEN-sensitized solar cells showed an overall conversion efficiency of 2.2% (JSC = 6.11 mA/cm2, VOC = 547 mV, FF = 0.66), which corresponds to 68% of N719-based device efficiency, fabricated under similar conditions. Electrochemical impedance spectroscopy (EIS) analysis reveals that charge recombination at the nanocrystalline TiO2/dye/redox electrolyte interface is similar for C1-LEN and N719 sensitized solar cells, i.e., charge recombination is not the factor limiting the performance of C1-LEN device.engSolar cellsDyesAlkyne bridge Electrochemical impedance spectroscopyCoumarinjournal article10.1016/j.jphotochem.2015.05.017