| 초록 |
The highly π-extended donor-acceptor (D-A) type alternating copolymer containing rigid and planar backbone has the potential to low-band gap polymer owing to efficient intramolecular charge transfer (ICT) and enhanced intermolecular interaction. In D-A copolymer systems, the alternation of alkyl substituents in the donor and/or acceptor can modulate intermolecular interaction, polymer chain orientation, and solid-state morphology, which could affect the properties of organic electronic devices significantly. In this study, we synthesized a series of dithieno[3,2-b:2’,3’-d]thiophene and diketopyrrolopyrrole(DPP)-based alternating copolymers, PDTTDPPs, with one of three branched alkyl side-chains tethered to the DPP moiety. We investigated the characteristics of the new PDTTDPP-based conjugated polymers bearing different alkyl chain substituents and the effect of the side chain on the device performance. |
