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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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FIG. 1.

(a) The chemical structure of RR-P3HT. The principal axes of proton hyperfine coupling of -electrons are also shown. (b) Schematic illustration of top contact FET device with RR-P3HT monolayer. (c) Transfer characteristic of a monolayer FET device. (d) The anisotropy of field-effect mobility in monolayer FETs.

Image of FIG. 2.

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FIG. 2.

Polarized UV-vis absorption spectra of a 5 monolayer film on quartz substrate. Solid and dashed curves show the absorbance with the polarization parallel and perpendicular to the preferential orientation of RR-P3HT polymer chain. The inset shows the layer-number dependences of and .

Image of FIG. 3.

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FIG. 3.

Orientation dependences of the field-induced ESR signals for the in-plane oriented FET devices (5 monolayer thick). The current flow direction is parallel to the -stack axis (Z-axis) in Fig. 3(a), defined as Device I, and the chain axis (Y-axis) in Fig. 3(b), defined as Device II. In each figure, the external magnetic field is applied perpendicular to the substrate (thin solid curve) and parallel to the source-drain direction (dashed curve), respectively. Calculated in-plane ESR spectra are also shown by thick curves.

Image of FIG. 4.

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FIG. 4.

Angular dependences of g-value and peak-to-peak linewidth of field-induced ESR signals due to polarons. Circles and squares show the data of the devices with the chain aligned perpendicular (Device I) and parallel (Device II) to , respectively. Triangles show the data of the device fabricated by a conventional drop-cast method.

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/content/aip/journal/apl/96/17/10.1063/1.3421538
2010-04-27
2014-04-24

Abstract

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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Scitation: Electron spin resonance observation of field-induced charge carriers in ultrathin-film transistors of regioregular poly(3-hexylthiophene) with controlled in-plane chain orientation
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/17/10.1063/1.3421538
10.1063/1.3421538
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