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Organic nanofibers integrated by transfer technique in field-effect transistor devices.

Tavares L, Kjelstrup-Hansen J, Thilsing-Hansen K, Rubahn HG - Nanoscale Res Lett (2011)

Bottom Line: Bottom contact devices are dominated by contact effects, while the top contact device characteristics are determined by the nanofiber bulk properties.It is found that the contact resistance is lower for crystalline nanofibers when compared to amorphous thin films.These results shed light on the charge injection and transport properties for such organic nanostructures and thus constitute a significant step forward toward a nanofiber-based light-emitting device.

View Article: PubMed Central - HTML - PubMed

Affiliation: NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, DK-6400 Sønderborg, Denmark. tavares@mci.sdu.dk.

ABSTRACT
The electrical properties of self-assembled organic crystalline nanofibers are studied by integrating these on field-effect transistor platforms using both top and bottom contact configurations. In the staggered geometries, where the nanofibers are sandwiched between the gate and the source-drain electrodes, a better electrical conduction is observed when compared to the coplanar geometry where the nanofibers are placed over the gate and the source-drain electrodes. Qualitatively different output characteristics were observed for top and bottom contact devices reflecting the significantly different contact resistances. Bottom contact devices are dominated by contact effects, while the top contact device characteristics are determined by the nanofiber bulk properties. It is found that the contact resistance is lower for crystalline nanofibers when compared to amorphous thin films. These results shed light on the charge injection and transport properties for such organic nanostructures and thus constitute a significant step forward toward a nanofiber-based light-emitting device.

No MeSH data available.


Related in: MedlinePlus

Nanofibers in top contacts configuration. (a) Fluorescence microscope image of nanofibers in the top contacts configuration. (b) White light microscope image of the sharp top contacts on nanofibers. (c) Scanning electron microscope image of the electrodes connecting to the nanofibers as indicated in (b).
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Figure 2: Nanofibers in top contacts configuration. (a) Fluorescence microscope image of nanofibers in the top contacts configuration. (b) White light microscope image of the sharp top contacts on nanofibers. (c) Scanning electron microscope image of the electrodes connecting to the nanofibers as indicated in (b).

Mentions: Figure 2a,b,c show the nanofibers integrity and also the sharpness of the electrode edges on top of the nanofibers (TC configuration) (Figure 2b,c). The stencil used had 2 μm channel length but because of a blurring effect [29] during electrode deposition, a channel length of only approximately 1.5 μm is observed in the SEM image.


Organic nanofibers integrated by transfer technique in field-effect transistor devices.

Tavares L, Kjelstrup-Hansen J, Thilsing-Hansen K, Rubahn HG - Nanoscale Res Lett (2011)

Nanofibers in top contacts configuration. (a) Fluorescence microscope image of nanofibers in the top contacts configuration. (b) White light microscope image of the sharp top contacts on nanofibers. (c) Scanning electron microscope image of the electrodes connecting to the nanofibers as indicated in (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211406&req=5

Figure 2: Nanofibers in top contacts configuration. (a) Fluorescence microscope image of nanofibers in the top contacts configuration. (b) White light microscope image of the sharp top contacts on nanofibers. (c) Scanning electron microscope image of the electrodes connecting to the nanofibers as indicated in (b).
Mentions: Figure 2a,b,c show the nanofibers integrity and also the sharpness of the electrode edges on top of the nanofibers (TC configuration) (Figure 2b,c). The stencil used had 2 μm channel length but because of a blurring effect [29] during electrode deposition, a channel length of only approximately 1.5 μm is observed in the SEM image.

Bottom Line: Bottom contact devices are dominated by contact effects, while the top contact device characteristics are determined by the nanofiber bulk properties.It is found that the contact resistance is lower for crystalline nanofibers when compared to amorphous thin films.These results shed light on the charge injection and transport properties for such organic nanostructures and thus constitute a significant step forward toward a nanofiber-based light-emitting device.

View Article: PubMed Central - HTML - PubMed

Affiliation: NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, DK-6400 Sønderborg, Denmark. tavares@mci.sdu.dk.

ABSTRACT
The electrical properties of self-assembled organic crystalline nanofibers are studied by integrating these on field-effect transistor platforms using both top and bottom contact configurations. In the staggered geometries, where the nanofibers are sandwiched between the gate and the source-drain electrodes, a better electrical conduction is observed when compared to the coplanar geometry where the nanofibers are placed over the gate and the source-drain electrodes. Qualitatively different output characteristics were observed for top and bottom contact devices reflecting the significantly different contact resistances. Bottom contact devices are dominated by contact effects, while the top contact device characteristics are determined by the nanofiber bulk properties. It is found that the contact resistance is lower for crystalline nanofibers when compared to amorphous thin films. These results shed light on the charge injection and transport properties for such organic nanostructures and thus constitute a significant step forward toward a nanofiber-based light-emitting device.

No MeSH data available.


Related in: MedlinePlus