The focus of recent attention has been devoted to improving device performance and stability, reducing the fabrication cost, exploring new applications, and developing simple fabrication techniques. However, it is still far from satisfactory for practical applications. Anyhow, OFETs have been considered as a key component of organic integrated circuits for application in flexible smart cards, low-cost radio frequency identification (RFID) tags, sensor devices, organic active matrix displays, and so on. Especially for the field-effect transistor, a lot of efforts have been done to develop new organic materials to improve device performance with high charge carrier mobility and good air stability. Organic-based semiconductors have various applications as key components of numerous electronic and optoelectronic devices, including field-effect transistors (FETs), photovoltaics (PVs), and light-emitting diodes (LED). Hence, using organic semiconducting materials has become an important topic in the development of low-cost, large area, flexible, and lightweight devices. Nevertheless, compared to the conventional silicon-based semiconductors, the organic-based semiconductors exhibit low cost, good processibility and can be fabricated on flexible substrates. Most importantly, the silicon-based materials are rare to be processed on flexible substrates due to their poor stretching characteristics. ![]() Although the conventional amorphous silicon-based semiconductors have achieved much progress with charge carrier mobility around 1.0 cm 2 V −1 s −1, the thin-film deposition of conventional semiconductor usually needs high temperature process and dustless conditions which significantly increase the fabricating cost. Organic field-effect transistors (OFETs) have received much attention for plastic electronics due to their good solution processability, low temperature deposition, low cost, and compatibility with large-area printing technology.
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