Comparison of top and bottom-contact organic thin film transistors for analog circuit applications

A comparative analysis of top and bottom-contact organic thin film transistors (OTFTs) for analog circuit applications is presented using a common source amplifier as an example. Using 2D numerical device simulations, it is shown that significantly higher product of voltage gain and 3dB bandwidth can be obtained using a top-contact OTFT. This advantage results primarily from a smaller gate-drain capacitance and increases in amplifiers designed for higher voltage gain.