Abstract
A ruthenium complex dye (N719) and a metal-free phenothiazine-based dye (PTZ-4) were used for the co-sensitized dye-sensitized solar cell (DSSC), intending to achieve complementary absorption spectra and reduce charge recombination, thereby improvement in the performance. Upon co-sensitization, the device made of the N719+PTZ-4 system yielded short-circuit photocurrent density (Jsc) of 16.69mA cm−2, open circuit voltage (Voc) of 0.75V, fill factor (FF) of 0.67 and power conversion efficiency (PCE) of 8.42%; this performance is superior to that of either individual device made from dye N719 (PCE = 7.11%) or dye PTZ-4 (PCE = 5.14%). The improved performance ascribes to effectively enhance light-harvesting efficiency and reduce charge recombination by the co-sensitization process.
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