Different Work Regimes of an Organic Thin Film Transistor OTFT and Possible Applications in Bioelectronics

Abstract

This paper presents an organic semiconductor transistor, with a vertical current modulation and a horizontal conduction. The simulations show a stronger top gate influence and establish four work regimes, depending on the top and bottom gates biasing. In the most favorable regime for the holes channel, under the reverse biased n + p junction, the holes/electrons current densities ratio reaches 0.168/269. However, an ambipolar OTFT function occurs under the reverse biasing of the vertical junction, with a top n-layer and a bottom p-layer. Due to the asymmetrical doping profile, the n + channel conduction prevails in all the regimes. Therefore, the maximum current density of 1900A/cm 2 is ensured by a double n channel, when both gates are positive biased. After simulations, three distinct work regimes are revealed by this single device: a SOI behavior with volume channel, a JFET with neutral median channel and an OTFT with one or more interface channels.

Introductory Chapter: Green Electronics Starting from Nanotechnologies and Organic Semiconductors

“…It posses the additional advantage to be already fully depicted inside the Atlas library. The simulated static characteristics prove the transistor effect, ensuring the drain current saturation, [42].…”