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Controlling the Field‐Effect Mobility of Regioregular Polythiophene by Changing the Molecular Weight
Author(s) -
Kline R.J.,
McGehee M.D.,
Kadnikova E.N.,
Liu J.,
Fréchet J.M.J.
Publication year - 2003
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200305275
Subject(s) - polythiophene , materials science , electron mobility , polymer , conjugated system , conductive polymer , chemical physics , chemical engineering , optoelectronics , composite material , chemistry , engineering
A clear dependence of the hole mobility on molecular weight of poly(3‐hexylthiophene) in films is demonstrated. The charge carrier mobility of regioregular polythiophene is shown to increase by four orders of magnitude as the molecular weight is increased from ∼3 200 g mol –1 to 36 000 g mol –1 . These observations could explain why the mobility values obtained in different labs vary so widely and suggest that optimizing the molecular weight of conjugated polymers could lead to significant improvements in device performance.