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Keywords:

  • organic thin-film transistors;
  • contact length;
  • contact resistance;
  • cutoff frequency
Thumbnail image of graphical abstract

Bottom-gate, top-contact organic thin-film transistors (TFTs) with excellent static characteristics (on/off ratio: 107; intrinsic mobility: 3 cm2 (V s)−1) and fast unipolar ring oscillators (signal delay as short as 230 ns per stage) are fabricated. The significant contribution of the transfer length to the relation between channel length, contact length, contact resistance, effective mobility, and cutoff frequency of the TFTs is theoretically and experimentally analyzed.