TY - JOUR
T1 - Carrier transport properties of monodisperse glassy-nematic oligofluorenes in organic field-effect transistors
AU - Yasuda, Takeshi
AU - Fujita, Katsuhiko
AU - Tsutsui, Tetsuo
AU - Geng, Yanhou
AU - Culligan, Sean W.
AU - Chen, Shaw H.
PY - 2005/1/25
Y1 - 2005/1/25
N2 - A heptafluorene, F(Pr)5F(MB)2, a dodecafluorene, F(MB)10F(EH)2, and poly(9,9′-dioctylfluorene), PFO, were used to prepare field-effect transistors. Monodomain and polydomain glassy-nematic films as well as glassy-amorphous films were prepared for the measurement of hole mobility. In a monodomain film, the μ∥ value is determined by the chain length in oligofluorene and the persistence length in polyfluorene. Mobility in a polydomain film lies between μ∥ and μ⊥ of a monodomain film. Amorphous films possess the lowest mobility of all presumably because of the geometric and energetic disorder. The OFET containing a monodomain glassy-nematic film of F(MB) 10F(EH)2 exhibits a field-effect mobility of 0.012 cm2/Vs with an on/off current ratio of 1.0 × 104, a substantial improvement over a monodomain glassy-nematic film of PFO.
AB - A heptafluorene, F(Pr)5F(MB)2, a dodecafluorene, F(MB)10F(EH)2, and poly(9,9′-dioctylfluorene), PFO, were used to prepare field-effect transistors. Monodomain and polydomain glassy-nematic films as well as glassy-amorphous films were prepared for the measurement of hole mobility. In a monodomain film, the μ∥ value is determined by the chain length in oligofluorene and the persistence length in polyfluorene. Mobility in a polydomain film lies between μ∥ and μ⊥ of a monodomain film. Amorphous films possess the lowest mobility of all presumably because of the geometric and energetic disorder. The OFET containing a monodomain glassy-nematic film of F(MB) 10F(EH)2 exhibits a field-effect mobility of 0.012 cm2/Vs with an on/off current ratio of 1.0 × 104, a substantial improvement over a monodomain glassy-nematic film of PFO.
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U2 - 10.1021/cm048532s
DO - 10.1021/cm048532s
M3 - Article
AN - SCOPUS:12344272486
SN - 0897-4756
VL - 17
SP - 264
EP - 268
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 2
ER -