Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.23: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Conjugated polymers with alternating benzothiadiazole-diketopyrrolopyrrole units for OTFTs: Synthesis and DFT/MD simulations — •René Daniel Méndez López1,2, Deyan Raychev1,2, Anton Kiriy1, Olga Guskova1,2, and Jens-Uwe Sommer1,2,3 — 1Leibniz IPF — 2DCMS, TU Dresden — 3Institute for Theoretical Physics, TU Dresden
Organic semiconducting polymers are adequate for large area and low cost electronic device applications, such as organic thin film transistors (OTFTs). The joint theoretical/experimental studies are crucial for understanding the charge transport in ambipolar OTFTs, in which both electrons and holes are mobile. Here we report on the synthesis, characterization and simulations of a polymer consisting of diketopyrrolopyrrole (DPP) and benzothiadiazole (B) units. DPP is a versatile building block for OTFTs and its synthesis is straightforward and inexpensive. The π-π intermolecular interactions, the solid-state packing, and optical properties are dependent on the nature of the conjugated blocks adjacent to DPP core. Here, furan (F) is proposed as such an adjacent unit, linking DPP and B blocks in the conjugated backbone. The synthesis of the PDPP-FBF copolymer was performed following Ref.1. From the experiments, the π-π distance, the HOMO-LUMO energy levels and the charge carrier mobilities are characterized. These values are compared with the results of simulations in order to get a deeper understanding of the parameters governing the mobility. This work is funded by ERDF and Free State of Saxony via ESF project CoSiMa 100231947.[1] P. Sonar et al. Chem. Commun., 2012, 48, 8383.