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Bulk mobility of polycrystalline thin films of quaterthiophene derivatives
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Figures

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FIG. 1.

Chemical structure of quaterthiophene derivatives, n-QTP-n.

Image of FIG. 2.

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FIG. 2.

Textures of 8-QTP-8 in liquid crystal cell with transmission polarization microscope: (a) smectic G phase (b) polycrystalline phase.

Image of FIG. 3.

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FIG. 3.

Transient photocurrents for positive carriers in polycrystalline phase of 8-QTP-8. The cell thickness was . The inset shows the inverse of transit time as a function of applied voltages, indicating mobility independent of electric field.

Image of FIG. 4.

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FIG. 4.

Transfer characteristic at and output characteristic of top-contact type OFET . Semiconductor layer was made by spin-coating of 8-QTP-8 1 wt %-diethylbenzene solution at 3000 rpm for 30 s under .

Tables

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Table I.

Polycrystalline phase mobility of all QTP derivatives. All measurements were carried out at room temperature.

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/content/aip/journal/apl/98/10/10.1063/1.3555435
2011-03-08
2014-04-21

Abstract

Although polycrystallinethin films of organic materials are applied for organic field effect transistors, their bulk electrical properties have not been characterized. In this study, we investigated hole transport properties in the polycrystallinethin films of a series of quaterthiophene derivatives by both time-of-flight experiments and field effect measurements. The time-of-flight bulk mobility was almost same or smaller than field effect mobility. Both mobilities showed a similar trend as a function of side chain length. We discussed these results from the view point of the intrinsic nature of quaterthiophenes, which gave a fundamental knowledge of charge transport properties in the organic polycrystallinethin films.

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Scitation: Bulk mobility of polycrystalline thin films of quaterthiophene derivatives
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/10/10.1063/1.3555435
10.1063/1.3555435
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