Abstract
We have fabricated organic thin-film transistors (OTFTs) and implemented
inverters on flexible substrates using polythiophene (PHT) as the semiconductor
and polyvinylphenol (PVP) as the gate dielectric. The semiconductor was defined
by inkjet printing. The poor consistency of the printing process has affected
the uniformity of inkjet-printed OTFTs enormously. We also proposed a method
to increase the yield by incorporating a pre-testing step during circuit fabrication.
We designed and fabricated a basic unit of circuits called a thin-film transistor
(TFT) array. These devices were then connected to each other to form a gate
via printed nano-silver. To verify the implementation flow, we designed and
measured bootstrap inverters and ring oscillator composed of them. The five-stage
ring oscillator has been fabricated and oscillated at the frequency, 60 Hz,
when the supply voltage is 40 V
© 2009 IEEE
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