title: Annealing-free high-mobility diketopyrrolopyrrole-quaterthiophene copolymer for solution-processed organic thin film transistors.
abstract: A donor-acceptor polymer semiconductor, PDQT, comprising diketopyrrolopyrrole (DPP) and β-unsubstituted quaterthiophene (QT) for organic thin film transistors (OTFTs) is reported. This polymer forms ordered layer-by-layer lamellar packing with an edge-on orientation in thin films even without thermal annealing. The strong intermolecular interactions arising from the fused aromatic DPP moiety and the DPP-QT donor-acceptor interaction facilitate the spontaneous self-assembly of the polymer chains into close proximity and form a large π-π overlap, which are favorable for intermolecular charge hopping. The well-interconnected crystalline grains form efficient intergranular charge transport pathways. The desirable chemical, electronic, and morphological structures of PDQT bring about high hole mobility of up to 0.97 cm(2)/(V·s) in OTFTs with polymer thin films annealed at a mild temperature of 100 °C and similarly high mobility of 0.89 cm(2)/(V·s) for polymer thin films even without thermal annealing.
authors.affiliation: Institute of Materials Research and Engineering, Agency for Science, Technology, and Research, 3 Research Link, Singapore 117602. yuning.li@uwaterloo.ca
authors.forename: Yuning
authors.initials: Y
authors.lastname: Li
authors.forename: Prashant
authors.initials: P
authors.lastname: Sonar
authors.forename: Samarendra P
authors.initials: SP
authors.lastname: Singh
authors.forename: Mui Siang
authors.initials: MS
authors.lastname: Soh
authors.forename: Martin
authors.initials: M
authors.lastname: van Meurs
authors.forename: Jozel
authors.initials: J
authors.lastname: Tan