Systematic investigation of a novel low-bandgap terpolymer library via inkjet printing: Influence of ink properties and processing conditions

摘要

The thin-film properties of a polymer library consisting of novel conjugated low-bandgap poly(diketopyrrolopyrrole-co-benzothiadiazole-co- fluorene) (poly(DPP-co-BTD-co-F)) polymers are investigated. The content of the monomer units in the copolymers is systematically varied. Structure-property relationships are obtained for the ink characteristics, the film formation qualities, and their optical properties. Toluene/o-DCB in a ratio 90/10 and a concentration of 5 mg mL-1 is found to be a suitable solvent system for all polymers. The polymer compositions and the choice of solvent have a significant influence on the film properties. Inkjet printing is shown to be a suitable technique for the preparation of thin-film libraries that subsequently can be characterized by combinatorial screening tools. A thin-film library consisting of novel conjugated low-bandgap poly(diketopyrrolopyrrole-co- benzothiadiazole-co-fluorene) (poly(DPP-co-BTD-co-F)) polymers is investigated by combinatorial screening and inkjet printing. The polymer compositions and the choice of solvent are found to have a significant influence on the film properties