Scaling organic transistors: materials and design
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Envisaged applications of organic thin-film transistors in future polymer electronics lead to requirements on the supply voltage, threshold voltage, sub threshold characteristics, on-off ratio, and cut-off frequency. We present an analysis of the corresponding requirements using both analytical estimates and numerical two-dimensional simulations. Of special importance are the connections between cut-off frequency, channel length and mobility, mobility and doping, thicknesses of the active layer and gate insulator, doping, interface charges and states, and threshold voltage, traps and subthreshold slope. They lead to demands on both material properties and transistor design. Considering a minimum application-relevant cut-off frequency and a limitation of the mobility for low-cost solution-based deposition, one is led inevitably to the need of a submicrometer channel length and rather thin organic gate insulator. Experimental realization is shown and an approach to submicrometer organic CMOS is discussed.
Bibliogr. 28 poz.