Date

Place

[35-1]
15:30 ~ 15:55
Title:[Invited] Polymer-Sorted Semiconducting Carbon Nanotubes for High-Mobility Field-Effect Transistors and Near-Infrared Electroluminescence
Jana Zaumseil (Universitat Heidelberg, Germany)
Abstract: Field-effect transistors based on dense networks of single-walled carbon nanotubes (SWNT) are competitive alternatives to other solution-processable semiconductors. Purely semiconducting SWNTs with different bandgaps can be extracted and enriched by dispersion with various polyfluorenes. Top-gate FETs fabricated with thin films of these SWNT and a hybrid gate dielectric show balanced ambipolar transport with on/off ratios above 106 and high effective mobilities (50 cm2V-1s-1) at low voltages (<5V) as well as near-infrared electroluminescence with narrow linewidths. Charge transport paths within random and semi-aligned networks of SWNTs depend on network density, bandgap distribution and alignment. Electroluminescence maps of these networks, which are markedly different from the corresponding photoluminescence (PL) images, visualize preferential current paths in such networks. The fraction of emission from different species of nanotubes depends on the applied voltages and resulting current density. At very high carrier densities trion (charged exciton) emission is observed in addition to excitonic emission.?
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