Abstract
A spice-friendly model for the planar spreading of current for side-extended OTFTs is proposed in this paper. The semiconducting region extends on the either side of electrodes due to the resolution of organic printers, circular edges of the semiconducting region, nucleation near the corner and the coffee ring effect. Small flexible memory and logic circuits required small drive current. Thus, width is kept small. The side extended semiconducting region is mostly covered by the gate and carries a significant amount of both ON and OFF current. Development of model is performed in two steps- i) separation of currents, injected from near-corner of the electrode and from sides of the electrode; and ii) deriving equations using conformal map. The model is also verified using TCAD simulations and fabrication results.