Limits...
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 drain-source voltage for zero gate voltage for (a) p6P nanofibers transferred from mica to a transistor platform and (b) p6P thin films for BC/BG, BC/TG and TC/BG configurations.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211406&req=5

Figure 4: Current versus drain-source voltage for zero gate voltage for (a) p6P nanofibers transferred from mica to a transistor platform and (b) p6P thin films for BC/BG, BC/TG and TC/BG configurations.

Mentions: Figure 4a shows current versus drain-source voltage for zero gate voltage for transferred p6P nanofibers for BC/BG, BC/TG, and TC/BG configurations, while the inset shows the same data plotted with a different current scale. Considering that approximately the same number of nanofibers was present in all the samples, the coplanar (BC/BG) configuration exhibits a lower output current than the staggered geometries due to a high contact resistance associated with the high injection barrier to the organic material [32]. In the staggered geometries (BC/TG and TC/BG), the charges are injected not only from the edge of the electrode but also from the surface of the contacts in the region where the source-drain electrodes overlap with the gate electrode and consequently charges are injected over a larger area leading to a lower contact resistance than in the coplanar (BC/BG) geometry [26].


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 drain-source voltage for zero gate voltage for (a) p6P nanofibers transferred from mica to a transistor platform and (b) p6P thin films for 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 4: Current versus drain-source voltage for zero gate voltage for (a) p6P nanofibers transferred from mica to a transistor platform and (b) p6P thin films for BC/BG, BC/TG and TC/BG configurations.
Mentions: Figure 4a shows current versus drain-source voltage for zero gate voltage for transferred p6P nanofibers for BC/BG, BC/TG, and TC/BG configurations, while the inset shows the same data plotted with a different current scale. Considering that approximately the same number of nanofibers was present in all the samples, the coplanar (BC/BG) configuration exhibits a lower output current than the staggered geometries due to a high contact resistance associated with the high injection barrier to the organic material [32]. In the staggered geometries (BC/TG and TC/BG), the charges are injected not only from the edge of the electrode but also from the surface of the contacts in the region where the source-drain electrodes overlap with the gate electrode and consequently charges are injected over a larger area leading to a lower contact resistance than in the coplanar (BC/BG) geometry [26].

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