Influence of the organic transistors' layout on electrical parameters

The paper aims to assess how the geometry of the organic thin film transistors (OTFTs) influences their electrical parameters. The transistors have polytriarylamine (PTAA) as semiconductor. Several geometries will be investigated for transistors fabricated in a single batch. These geometries include simple electrodes, inter-digitated electrodes and circular electrodes. The electrical parameters considered are threshold voltage, mobility, ON-OFF ratio, the sub-threshold swing and the contact resistance. All the measurements are performed with a calibrated semiconductor analyzer in accordance to the IEEE 1620 standard. The paper discusses the trade-off between the ease of fabrication and the increase in performance of these devices.