| 초록 |
Since it has been realized that insufficient photon absorption at longer wavelengths affords a serious limitation to high efficient polymer solar cells, many low-bandgap polymeric materials have been synthesized to increase the performance of organic solar cells. Among several methods to synthesize low-bandgap polymeric materials, the method to synthesize donor-acceptor alternating copolymers has great advantage because their electronic properties can be finely tuned by adjusting the intramolecular charge transfer between the electron donor and acceptor units in the copolymer. In this study, we report the synthesis and characterization of a new class of donor-acceptor alternating copolymers comprising of 3-hexylthiophene and 9,9’-bifluorenylidene as an electron-donating and an electron-withdrawing unit, respectively. The pholtovolaic properties of the copolymers are measured and related with their chemical and electronic structures. |
