Investigation of benzo(1,2-b:4,5-b′)dithiophene as a spacer in organic dyes for high efficient dye-sensitized solar cell

Two benzo(1,2-b:4,5-b′)dithiophene (denoted as BDT) based organic dyes, Dye 1 and Dye 2, containing triphenylamine and carbazole in the molecular frameworks respectively, were synthesized, characterized and applied in dye-sensitized solar cells (DSSCs). The photo-physical, photovoltaic, and electrochemical properties of the two dyes were analyzed in this work. The two dyes exhibit strong charge transfer absorption bands in the visible region. The dyes were applied in dye sensitized solar cells obtaining 11.34 mA/cm2, 0.75 V and 0.74, for the short-circuit photocurrent density (Jsc), open-circuit voltage (Voc), and fill factor (FF) respectively, corresponding to an overall power conversion efficiency of 6.3%. These results revealed that BDT-based dyes are promising dyes for DSSCs.

Two organic dyes with benzo(1,2-b:4,5-b′)dithiophene (denoted as BDT) spacer have been prepared in combination with the triphenylamine and carbazole used as donor and the cyanoacrylic acid used as acceptor. And they exhibit up to 6% conversion efficiency based on regular liquid dye solar cell. Among them, the dye containing triphenylamine group shows the short-circuit photocurrent density (Jsc), open-circuit voltage (Voc), and fill factor (FF) of the device are 11.34 mA/cm2, 0.75 V, and 0.74, respectively, corresponding to an overall conversion efficiency of 6.3%.Figure optionsDownload as PowerPoint slide