Abstract
Indoline dye D-1 was successfully applied as a cosensitizer for improving the spectral response of black dye in dye-sensitized solar cells (DSCs). It was observed that D-1 effectively increases the short-circuit photocurrent by offsetting the competitive light absorption by I/I-3(-) electrolyte in the wavelength region 350-500 nm when absorbed on the TiO2 nanocrystalline films in a mix dye system. The DSCs containg the D-1 and black dye achieved a power conversion efficiency of 9.80% with higher short-circuit photocurrent of 19.54 mA/cm(2) compared to the system of black dye without cosensitization under standard AM 1.5 sunlight.