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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 S√łnderborg, 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

Current versus gate voltage at Vds = -15 V for p6P (a) nanofibers and thin films in TC/BG configuration and (b) for nanofibers in BC/BG, BC/TG, and TC/BG configurations.
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Figure 5: Current versus gate voltage at Vds = -15 V for p6P (a) nanofibers and thin films in TC/BG configuration and (b) for nanofibers in BC/BG, BC/TG, and TC/BG configurations.

Mentions: Figure 5 shows the transfer characteristics, i.e., gate voltage sweep at a certain Vds for both p6P thin films and nanofibers. Figure 5a shows that the nanofibers conduct better than the thin films (as mentioned previously the film cross-sectional area is around eight times the nanofiber cross-section) and current saturation is not observed reinforcing the conclusion from Figure 4.


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)

Current versus gate voltage at Vds = -15 V for p6P (a) nanofibers and thin films in TC/BG configuration and (b) for nanofibers in BC/BG, BC/TG, and TC/BG configurations.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Current versus gate voltage at Vds = -15 V for p6P (a) nanofibers and thin films in TC/BG configuration and (b) for nanofibers in BC/BG, BC/TG, and TC/BG configurations.
Mentions: Figure 5 shows the transfer characteristics, i.e., gate voltage sweep at a certain Vds for both p6P thin films and nanofibers. Figure 5a shows that the nanofibers conduct better than the thin films (as mentioned previously the film cross-sectional area is around eight times the nanofiber cross-section) and current saturation is not observed reinforcing the conclusion from Figure 4.

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 S√łnderborg, 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