| 초록 |
Control of band gap and molecular energy levels improve photovoltaic properties of conjugated polymers. Copolymerizing of different units is a general way to adjust structures of polymers. We synthesized low-band gap polymers based on benzodithiophene and thieno[3,4-b]thiophene in conjunction with binaphthyls. We inserted binaphthyls to control of band gaps and morphology. Five polymers were synthesized with different ratios of binaphthyls. The polymers were characterized by absorption spectroscopy, electrochemistry, and GPC. We confirmed blue-shiftings in UV-vis with increasing ratio of binaphthyls, because rotatable hinge parts of the binaphthyls reduce the conjugations. We also tested photovoltaic properties using these binaphthyl-containing low-band gap polymers. |
