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Electron spin resonance observation of field-induced charge carriers in ultrathin-film transistors of regioregular poly(3-hexylthiophene) with controlled in-plane chain orientation
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Ultrathin-film polymerictransistors with controlled in-plane chain orientation have been fabricated based on Langmuir–Blodgett technique by cospreading liquid crystal molecule with regioregular poly(3-hexylthiophene). The mobilities parallel to the chain direction reached for 1 to 5 monolayer thick transistors. Mobility ratio was about 2 for the parallel and perpendicular directions. Electron spin resonance(ESR) signals of the field-induced polarons exhibited clear in-plane anisotropies due to unpaired -electrons. The anisotropicESR spectra together with the optical dichroism determine the detailed molecular orientations in the channel of such ultrathin transistors.
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