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We report the characteristics of complementary organic ring oscillators. The shortest delay time measured is 38 μs per stage that corresponds to a 2.63 kHz oscillation frequency. The active material in the n-channel transistors is copper hexadecafluorophthalocyanine and that in the p-channel transistors is an oligothiophene/oligothiophene derivative.
Lin et al. (Mon,) studied this question.