Tetracene light-emitting transistors on flexible plastic substrates

  • Santato C
  • Manunza I
  • Bonfiglio A
 et al. 
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We report on org. light-emitting (field-effect) transistors (LETs) fabricated on a flexible and transparent plastic foil (Mylar), acting both as substrate and gate dielec. The foil is patterned on one side with bottom-contact Au source and drain electrodes, while a thin film of Au is evapd. on the opposite side of the foil to form the gate electrode. A vacuum sublimed tetracene film is employed as an active layer for charge transport and light emission. At. force microscopy shows that tetracene films have a good adhesion on Mylar and exhibit a granular structure. The transistor shows unipolar p-type behavior with mobilities typically of 5 * 10-4 cm2/V s. Drain-source current and electroluminescence were simultaneously measured. Provided a suitable gate bias is applied, light emission occurs at drain-source voltages (Vds) above satn. LETs on plastic substrates could open the way to flexible devices combining the switching function of a transistor and the light emission. [on SciFinder (R)]

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