Authors Karpov, Y. ; Erdmann, T. ; Stamm, M. ; Lappan, U. ; Guskova, O. ; Malanin, M. ; Raguzin, I. ; Beryozkina, T. ; Tetyana, B. ; Bakulev, V. ; Günther, F. ; Gemming, S. ; Seifert, G. ; Hambsch, M. ; Mannsfeld, S. ; Voit, B.
Title Molecular doping of a high mobility diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene donor-acceptor copolymer with F6TCNNQ
Date 23.01.2017
Number 52395
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.
Publisher Macromolecules
Citation Macromolecules 50 (2017) 914-926

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