Synthesis and photoelectric properties of an organic dye containing benzo1,2-b∶4,5-b'dithiophene for dye-sensitized solar cells

摘要

A novel benzodithiophene-containing organic dye BDT was synthesized and characterized as a sensitizer for a nanocrystalline TiO2-based dye-sensitized solar cell.The BDT dye shows two major electronic absorptions.The absorption of the BDT dye covers a broad visible range from 300 nm to 550 nm.The benzodithiophene unit was used as a π bridge with several advantages:(1) It facilitates the electron transfer from the donor to the acceptor; (2) A facile structural modification on the 4,8-positions in the benzodithiophene unit can be achieved; (3) Fusing benzene with two flanking thiophene units improves the thermal stability.Under simulated AM1.5G solar light (100 mW/cm2) illumination,the DSC based on BDT gives a power conversion efficiency of 1.78％.