Pentacene organic transistors and ring oscillators on glass and on flexible polymeric substrates

Klauk, Hagen; Halik, Marcus; Zschieschang, Ute; Eder, Florian; Schmid, Günter; Dehm, Christine
June 2003
Applied Physics Letters;6/9/2003, Vol. 82 Issue 23, p4175
Academic Journal
We have fabricated organic thin film transistors, inverters, and ring oscillators on glass and on flexible polyethylene naphthalate, using the small-molecule hydrocarbon pentacene as the semiconductor and solution-processed polyvinylphenol as the gate dielectric. Depending on the choice of substrate, the transistors have a carrier mobility between 0.3 and 0.7 cm[SUP2]/V s, an on/off current ratio between 10[SUP5] and 10[SUP6], and a subthreshold swing between 0.9 and 1.6 V/decade. To account for the positive switch-on voltage of the transistors, circuits were designed to operate with integrated level shifting. Depending on the type of substrate, ring oscillators have a signal propagation delay as low as 15 μs per stage.


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