An organic transistor is a transistor that uses an organic semiconductor as its active layer. These devices are also referred to as organic thin-film transistors (OTFTs). An OTFT normally consists of source, drain, and gate electrodes as well as a gate insulator and an organic active layer. In principle, the current that flows between the source and drain electrodes through the active layer is controlled by an electric field that is produced by the gate electrode and the gate insulator.
Organic active layers can be formed at room temperature on plastic films either by vacuum deposition or by wet coating processes such as inkjet printing.
By combining OTFTs with other functional materials, various sensors can be developed. By integrating OTFTs, the fabrication of logic circuits and driving circuits is made possible. The OTFT research group at Yamagata University is conducting extensive research into printable OTFTs and their potential applications.
With the increasing prominence of the Internet, Internet of Things (IoT) technology has become of greater interest to society. IoT connects devices in living spaces and allows for applications to be performed in these spaces even when their occupants are not around. The IoT era will require a large number of different sensors. Organic sensors can be used to sense many different things, such as temperature and pressure, and they can be used in biosensors. Organic transistors can be used for these sensors by combining with functional materials that react to temperature, pressure, and physiologically active substances.
They can also be used in biological sensors that constantly monitor a person’s health; such applications are expected to greatly increase in the near future.
In particular, biological sensors that can constantly monitor the state of health, sleep and so on in life is highly expected.