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Flexible Pentacene/PMMA Thin-Film Transistors Fabricated on Aluminium Foil Substrates

  • J. Puigdollers (a1), C. Voz (a1), M. Fonrodona (a1), I. Martín (a1), A. Orpella (a1), M. Vetter (a1) and R. Alcubilla (a1)...

Abstract

Pentacene thin-film transistors (TFT) were fabricated on aluminum foils using polymethyl methacrylate (PMMA) as gate dielectric. In such structure, the aluminum substrate acts as the gate electrode itself. A bottom gate inverted structure was used to study the influence of the dielectric and the aluminum substrate on the device performance.

Pentacene thin-films were deposited by thermal evaporation in high-vacuum at deposition rates around 3 Ås-1 and three different substrate temperatures (30, 60 and 90°C). The maximum process temperature achieved was 170°C, corresponding to the baking of polymethyl methacrylate. The TFTs exhibit field-effect mobility values of ∼ 10-3 cm2V-1s-1 and threshold voltage values around –15 V. The influence of the dielectric and the substrate temperature on the pentacene structure and device field-effect mobility is discussed.

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