Monolayer Organic Transistors—From Fabrications to Applications

Solution processable organic semiconductors can be a high potential candidate for the organic field effect transistor (OFETs) applications. Comparing with the thermal evaporated thin film, the films developed by solution shearing have better crystallinity and larger single crystal domains. These films can usually offer a higher carrier mobility and lower subthreshold swing. In this talk, I will discuss the approaches to further reduce the thickness of these organic thin films down to monolayer thickness and their advantages on reducing the contact resistance of the OFETs. The impacts of different solution processing parameters and the quality of the films will be compared. I will also discuss the origin of the contact resistance in these monolayer OFETs and how are they different from the OFETs with thicker active layer while under the staggered structure. Lastly, I will also show the potential applications of the monolayer OFETs for the electrophysiological signal sensing.