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Donostia / San Sebastián, Spain

Golmar F.,CIC NanoGUNE2 | Golmar F.,CONICET | Golmar F.,National University of San Martin of Argentina | Stoliar P.,CIC NanoGUNE2 | And 9 more authors.
Physica Status Solidi (A) Applications and Materials Science | Year: 2015

We present performance characteristics of nanoscaled cobalt phthalocyanine (CoPc)-based organic field-effect transistors (OFETs) as a function of channel length. We found a channel length range which maximizes the field effect mobility in a trade-off between the decrease in the number of organic grain boundaries and the increase of the electrode-organic contact region. Further reduction of channel length is limited by fringe currents, which lead to an increased off current and to a degradation of the sub-threshold slope. From this, we define an optimal channel length of 280 nm to 1 μm for applications in submicrometric CoPc-based OFETs. Our results are particularly relevant for the miniaturization of chemical sensing OFETs, where metal phthalocyanines have proven to be excellent candidates for the fabrication of the transistor channel. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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