MixDes 2011 - Outstanding Paper Award
The young researcher Frédéric ZANELLA, a PhD student at CSEM, and co-authors from CSEM and EPFL were awarded an Outstanding Paper Award at the MIXDES (Mixed Design of Integrated Circuits and Systems) conference in Gliwice (Poland), 16 to 18 June 2011. MIXDES covers research in design, modeling, simulation, testing and manufacturing in diverse fields including micro- and nanoelectronics, semiconductors, sensors, actuators and power devices.
His paper, entitled 'Towards a gm/Id design methodology for polymer-based organic thin film transistors', is the fruit of a collaboration with Adrian von Mühlenen, Zbigniew Szamel, Giovanni Nisato and Christian Enz from CSEM and Jean-Michel Sallese from EPFL, in the field of solution-processable organic thin film transistors (OTFTs).
Results in brief
While this emerging technology makes possible the production of flexible electronics (displays, RFID tags and even microprocessors) at low-cost, it suffers from a significant spread of process/performance parameters which makes the design of analog/digital blocks particularly challenging.
By comparison, the gm/Id design methodology used for analog-circuit design of silicon MOSFETs uses the gm/Id (transconductance over drain current) versus IC (inversion coefficient) characteristic which remains invariant to process parameters (for long channel devices). Applying the same approach to organic electronics will thus help circuit designers and decrease the time-to-market of the aforementioned applications.
To do this it must be first shown that such an invariant representation also exists for this technology even if the charge transport mechanism in polymers is different from that in monocrystalline silicon. This is indeed what the authors show in their paper, using experimental data from various polymer-based OTFTs.
They also used this method to extract the parameters of a commonly used model that describes the charge carrier mobility in polymers (VRH).
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