Novel Approaches for High-Performance Organic Transistors

The first organic transistors reported were organic electrochemical transistors (OECT, 1984) historically before the organic field effect transistor (OFET, 1986), the organic inversion transistor (2011), and the organic bipolar transistor (2022). After a longer phase of limited interest, OECT have recently been investigated intensively since they offer switching and sensing functionality in an electrolytic environment compatible with biological systems. The mixed electron-ion transport of the devices has consequence for many parameters of the devices including dynamics and hysteresis. In this talk, our recent work on a better understanding of OECT operation is discussed. Recently, we have shown that the so far used electrostatic “FET-like” description of OECT is needs to be extended to a model including entropic and enthalpic terms. The model elegantly describes a multitude of effects, including bistability and a peculiar temperature behavior of subthreshold slopes. Besides offering new insight into the basic operation, it also allows novel device applications.