Light-emitting polymer/carbon nanotube hybrid transistors: below and above the percolation limit

Ming Wang; Florian Jakubka; Florentina Gannott; Jana Zaumseil

doi:10.1117/12.2023399

18 September 2013 Light-emitting polymer/carbon nanotube hybrid transistors: below and above the percolation limit

Ming Wang, Florian Jakubka, Florentina Gannott, Jana Zaumseil

Proceedings Volume 8831, Organic Field-Effect Transistors XII; and Organic Semiconductors in Sensors and Bioelectronics VI; 88310K (2013) https://doi.org/10.1117/12.2023399
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States

Abstract

Hybrids of semiconducting polymers and single-walled carbon nanotubes (SWNT) are interesting for organic electronic devices such as solar cells, light-emitting diodes and field-effect transistors (FETs). They are easily produced by selective dispersion of SWNTs in polymer solutions by ultrasonication followed by centrifugation. We demonstrate that nanotubes at concentration levels well below the percolation limit significantly improve charge injection of both holes and electrons into semiconducting polymers in top-gate FETs. This leads to lower contact resistances and reduced threshold voltages, thus the maximum ambipolar currents and visible light emission due to electron-hole recombination are considerably enhanced. The improved injection of holes and electrons allows for a much wider range of accessible polymers for ambipolar and light-emitting transistors. The same conjugated polymers can also be used to enrich specific semiconducting SWNT and to produce high-performance ambipolar nanotube network FETs. These show efficient nearinfrared electroluminescence. Mapping the emission from these networks during a gate voltage sweep allows us to visualize preferential current paths and investigate percolation models for purely semiconducting nanotube networks.

Citation Download Citation

Ming Wang, Florian Jakubka, Florentina Gannott, and Jana Zaumseil "Light-emitting polymer/carbon nanotube hybrid transistors: below and above the percolation limit", Proc. SPIE 8831, Organic Field-Effect Transistors XII; and Organic Semiconductors in Sensors and Bioelectronics VI, 88310K (18 September 2013); https://doi.org/10.1117/12.2023399

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