| 초록 |
Alkyl chains have been demonstrated to play important roles in intermolecular interactions and supramolecular self-assembly. Generally, alkyl chains are attached onto conjugated polymers as solubilizing groups to ensure polymer solubility in organic solvents. Moreover, the chain type and length as well as substituting position on conjugated polymers have crucial consequences on molecular packing and thin film morphology, and hence on device performance. Herein we describe the preparation of new diketopyrrolopyrrole (DPP)-based conjugated polymers, PTDPPA-J6, PTDPPA-J8, PTDPPA-J12, consisting with different alkyl chains in the DPP unit and its use in the solution-based fabrication of organic thin film transistors (OTFTs). We have observed highest hole mobility, 0.15 cm2/Vs for PTDPPA-J6, 0.05 cm2/Vs for PTDPPA-J8, and 0.34 cm2/Vs for PTDPPA-J12. The structure-property relationship by structural characterization has been further investigated. |
