| 초록 |
Organic photovoltaics(OSCs), generally based on the bulk-heterojunction(BHJ) concept, have attracted tremendous attention due to potential applications in flexible and large-area devices. The benzo[1,2-b:4,5-b’]dithiophene(BDT) is another well used donor unit in high performance polymers at present. Because it have many advantages which are long π conjugation length, low HOMO level and high charge carrier mobility. To have a BDT's advantages and additional properties, we synthesized the structural isomer of BDT unit that is a benzo[2,1-b;3,4-b']dithiophene(BDP). The BDP has a improved planarity with a fused aromatic structures. It helps to form highly ordered films that facilitate charge-carrier transport. So we Introduced BDP derivatives as a donor materials and synthesized copolymers of Donor-Acceptor type via Stille coupling reaction in different conditions. The synthesized polymers were differed each in the molecular weight. It made a many difference of physical properties in OSCs. |
