Ring oscillator made of organic thin-film transistors produced by self-organized process on plastic substrate

The authors studied the fabrication of a ring oscillator consisting of organic inverters showing no hysteresis in output characteristics. They designed and fabricated the ring oscillator with bootstrapping inverters made of pentacene organic thin-film transistors on plastic produced by self-organized process, exhibiting the field-effect mobility of similar to 0.6 cm(2)/V s, on/off current ratio of 10(7), and threshold voltage of -5 V. The oscillation frequency of 3 kHz and signal propagation delay of 15 mu s per stage were achieved for an 11-stage oscillator with a supply voltage of 20 V. (c) 2006 American Institute of Physics.