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The influence of gate dielectrics on a high-mobility n-type conjugated polymer in organic thin-film transistors
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Figures

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FIG. 1.

(Color online) (a) Schematic diagram of a top-gate OTFT based on P(NDI2OD-T2) and (b) AFM image of a P(NDI2OD-T2) film spin-coated on a glass substrate.

Image of FIG. 2.

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FIG. 2.

(Color online)(a) Transfer characteristics (IDS ∼ VG, VDS = 8 V) and (b) output characteristics (IDS ∼ VD) of an OTFT based on P(NDI2OD-T2) and PS gate dielectric. (c) Transfer characteristics of an OTFT with P4VP gate dielectric. (d) Carrier mobilities as functions of the relative dielectric constants of gate insulators.

Image of FIG. 3.

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FIG. 3.

(Color online) (a) Saturation mobilities in OTFTs with different gate dielectrics (PS, PMMA, P4VP) measured at variable temperatures. The dashed lines show the fitting of the results with the equation . Inset: The activation energy Δ as a function of β. (b) GIXD pattern of a P(NDI2OD-T2) film under in-plane and out-of-plane x-ray scattering.

Tables

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Table I.

The parameters of P(NDI2OD-T2) OTFTs with different gate dielectrics.

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/content/aip/journal/apl/100/3/10.1063/1.3678196
2012-01-18
2014-04-20

Abstract

Organic thin-film transistors based on a high mobility n-type semiconductor poly{[n,n9-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,59-(2,29-bithiophene)} P(NDI2OD-T2) and different polymer gate dielectrics are fabricated. The average electron mobility decreases from 0.76 to 0.08 cm2/Vs with the increase of the gate dielectric constant from 2.6 to 7.8. The P(NDI2OD-T2) film shows unconventional face-on molecular packing, which results in short distances and pronounced interactions between electrons and gate dielectric. Therefore, the decrease of the electron mobility with the increasing dielectric constant is attributed to the Fröhlich polaron effect for the interaction between electrons in the channel and ionic polarization cloud in the gate dielectric.

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Scitation: The influence of gate dielectrics on a high-mobility n-type conjugated polymer in organic thin-film transistors
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/3/10.1063/1.3678196
10.1063/1.3678196
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