New D−π–A-Conjugated Organic Sensitizers Based on 4H-Pyran-4-ylidene Donors for Highly Efficient Dye-Sensitized Solar Cells
摘要:
We have synthesized a series of four new promising D-pi-A conjugated organic sensitizers with a proaromatic 4H-pyran-4-ylidene as a donor, a thiophene ring in the bridge, and 2-cyanoacrilic acid as acceptor. Comparison between different donor substituents and the modification of the thiophene ring resulted in molar extinction coefficients as high as 36399 M-1 cm(-1) at 551 nm. The photovoltaic properties of the DSSCs demonstrate power conversion efficiencies as high as 5.4%.