Mapping Charge Transport by Electroluminescence in Chirality-Selected Carbon Nanotube Networks

作者：Jakubka Florian; Backes Claudia; Gannott Florentina; Mundloch Udo; Hauke Frank; Hirsch Andreas; Zaumseil Jana^*

来源：ACS Nano, 2013, 7(8): 7428-7435.

DOI：10.1021/nn403419d

• single-walled carbon nanotubes
• selection
• field-effect transistor electroluminescence
• photoluminescence

We demonstrate random network single-walled carbon nanotube (SWNT) field-effect transistors (FETs) in bottom contact/top gate geometry with only five different semiconducting nanotube species that were selected by dispersion with poly(9,9-dioctylfluorene) in toluene. These FETs are highly ambipolar with balanced hole and electron mobilities and emit near-infrared light with narrow peak widths (%26lt;40 meV) and good efficiency. We spatially resolve the electroluminescence from the channel region during a gate voltage sweep and can thus trace charge transport paths through the SWNT thin film. A shift of emission intensity to large diameter nanotubes and gate-voltage-dependent photoluminescence quenching of the different nanotube species indicates excitation transfer within the network and preferential charge accumulation on small band gap nanotubes. Apart from applications as near-infrared emitters with selectable emission wavelengths and narrow line widths, these devices will help to understand and model charge transport in realistic carbon nanotube networks.

• 出版日期2013-8