Dense Carbon Nanotube Films as Transparent Electrodes in Low-Voltage Polymer and All-Carbon Transistors

Martin Held, Patrik Laiho, Antti Kaskela, Florentina Gannott, Marcel Rother, Esko Kauppinen, Jana Zaumseil*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)


Dense but transparent films of long and clean carbon nanotubes grown by the floating catalyst method, transferred and patterned on glass substrates, are employed as source and drain electrodes in top-gate field-effect transistors with both low-mobility semiconducting polymers and high-mobility networks of polymer-sorted semiconducting single-walled carbon nanotubes. Significant enhancement of ambipolar charge injection into the polymer semiconductor compared to gold electrodes is observed, while the limitations of sheet resistance become apparent for the high-mobility nanotube transistors. The injection of charges from gold compared to carbon nanotube electrodes into the semiconducting nanotube network is investigated by means of conductive atomic force microscopy indicating a less defined channel edge for the latter. Metal-free, all-carbon electrolyte-gated transistors with a nanotube network semiconductor as well as nanotube source, drain, and gate electrodes show both hole and electron transport at very low operating voltages.

Original languageEnglish
Article number1700331
Pages (from-to)1-7
JournalAdvanced Electronic Materials
Issue number10
Publication statusPublished - Oct 2018
MoE publication typeA1 Journal article-refereed


  • Carbon nanotubes
  • Charge injection
  • Field-effect transistors
  • Transparent electrodes


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