How to tackle parametric interplays in organic transistors
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Despite the rapid progress of organic field-effect transistors (OFETs), theoretical understanding of their operation is still lacking. While the problem is associated with multidisciplinary considerations and hierarchical features, such understanding is essential for the technology to realize its full potential. In this presentation, a combined experimental and theoretical investigation on OFET non-idealities is presented, which are regarded as a source of parameter ambiguities (e.g. mobility overestimation). We employed scanning Kelvin probe microscopy as a direct probe to decouple transport and injection contributions under current-carrying conditions, and designed OFETs with different structures. The separation and quantification of channel and contact voltages provide deep insights into the role of film morphology and metal/organic interfaces, and the results will pave the way for the dedicated OFET models with high reliability and broad applicability.