Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 25, Pages 9224-9231Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10961h
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Funding
- Chemical Sciences (CW) division of the Netherlands Organization for Scientific Research (NWO)
- Foundation for Fundamental Research on Matter (FOM)
- Chemical Sciences of NWO
- Foundation Shell Research
- Europees Fonds voor Regionale Ontwikkeling (EFRO)
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Three copolymers of thieno[3,2-b]thiophene (TT) and diketopyrrolo[3,4-c]pyrrole (DPP) with a varying number of interconnecting thiophene units (nT) were synthesized by Suzuki polymerization. The PDPPnT-TT polymers display optical band gaps in the range of 1.33 to 1.52 eV and show ambipolar charge transport when applied in a field-effect transistor (FET) with hole and electron mobilities up to 3 x 10(-2) and 2 x 10(-3) cm(2) V-1 s(-1), respectively. Organic solar cells based on the PDPPnT-TT polymers as donors and the fullerene derivative [60]PCBM as acceptor achieve power conversion efficiencies up to 3.4% when the layer is deposited with the use of a co-solvent. The co-solvent strongly affects the morphology of the active layer and improves the performance. For these polymers the LUMO-LUMO offset with [60]PCBM correlates with the photocurrent and the maximum external quantum efficiency.
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