| 초록 |
In this study, we report the newly-synthesized diketopyrrolopyrrole (DPP)-based conjugated polymers containing thienylene-vinylene-thienylene (TVT) derivatives with chlorine groups. Specifically, to investigate the effect of alkyl chain length we synthesized two conjugated polymers (2DPP-ClTVT and 7DPP-ClTVT). It was observed that the significant difference on the electrical, morphological and microstructural properties arising from alkyl chain length. As is well-known, the longer branching alkyl chain can weaken the steric effect and contributes to strong intermolecular π-π interactions, which is critical for charge transporting. However, Interestingly, 7DPP-ClTVT was exhibited 2~6 times lower hole and electron mobility compared with 2DPP-ClTVT despite its high crystallinity and shorter d-spacing. Thus, in this study, we intend to establish a decisive factor influencing charge transport through comprehensive analysis. |
