Molecular Doping of a High Mobility Diketopyrrolopyrrole-Dithienylthieno[3,2-b]thiophene Donor-Acceptor Copolymer with F6TCNNQ
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
Herein we present a molecular doping of a high mobility diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene donor-acceptor copolymer poly[3,6-(dithiophene-2-yl)-2,5-di(6-dodecyloctadecyl)pyrrolo[3,4-c]pyrrole-1,4-dione-alt-thieno[3,2-b]thiophene], PDPP(6-DO)2TT, with the electron-deficient compound hexafluorotetracyanonaphthoquinodimethane (F6TCNNQ). Despite a slightly negative HOMOdonor-LUMOacceptor offset of −0.12 eV which may suggest a reduced driving force for the charge transfer (CT), a partial charge CT was experimentally observed in PDPP(6-DO)2TT:F6TCNNQ by absorption, vibrational, and electron paramagnetic resonance spectroscopies and predicted by density functional theory calculations. Despite the modest CT, PDPP(6-DO)2TT:F6TCNNQ films possess unexpectedly high conductivities up to 2 S/cm (comparable with the conductivities of the benchmark doped polymer system P3HT:F4TCNQ having a large positive offset). The observation of the high conductivity in doped PDPP(6-DO)2TT films can be explained by a high hole mobility in PDPP(6-DO)2TT blends which compensates a lowered (relatively to P3HT:F4TCNQ) concentration of free charge carriers. We also show that F6TCNNQ-doped P3HT, the system which has not been reported so far to the best of our knowledge, exhibits a conductivity up to 7 S/cm, which exceeds the conductivity of the benchmark P3HT:F4TCNQ system.
Details
Originalsprache | Englisch |
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Seiten (von - bis) | 914-926 |
Seitenumfang | 13 |
Fachzeitschrift | Macromolecules |
Jahrgang | 50 |
Ausgabenummer | 3 |
Publikationsstatus | Veröffentlicht - 14 Feb. 2017 |
Peer-Review-Status | Ja |
Externe IDs
ORCID | /0000-0002-8487-0972/work/142247529 |
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ORCID | /0000-0002-4531-691X/work/148607611 |