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Intrachain versus Interchain Electron Transport in Poly(fluorene‐ alt ‐benzothiadiazole): A Quantum‐Chemical Insight
Author(s) -
Van Vooren Antoine,
Kim JiSeon,
Cornil Jérôme
Publication year - 2008
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700847
Subject(s) - electron , electron transport chain , anisotropy , materials science , perpendicular , thin film , electron mobility , fluorene , condensed matter physics , charge (physics) , polymer , chemical physics , chemistry , nanotechnology , physics , optoelectronics , optics , composite material , quantum mechanics , biochemistry , geometry , mathematics
Poly(9,9‐di‐ n ‐octylfluorene‐ alt ‐benzothiadiazole) [F8BT], displays very different charge‐transport properties for holes versus electrons when comparing annealed and pristine thin films and transport parallel (intrachain) and perpendicular (interchain) to the polymer axes. The present theoretical contribution focuses on the electron‐transport properties of F8BT chains and compares the efficiency of intrachain versus interchain transport in the hopping regime. The theoretical results rationalize significantly lowered electron mobility in annealed F8BT thin films and the smaller mobility anisotropy ( μ ∥ / μ ⊥ ) measured for electrons in aligned films (i.e. 5–7 compared to 10–15 for holes).