Role of Molecular Order and Solid-State Structure in Organic Field-Effect Transistors

A study was conducted to investigate the role of molecular order and solid-state structure in organic field-effect transistors (OFET). Investigations revealed that the operation principle of an OFET relied on the application of an electric field that led to the formation of a conducting channel in the dielectric or semiconductor interface. The performance of such an OFET was mainly determined by the charge carrier mobility, which had been improved significantly after the fabrication of the first OFET. The investigations also revealed that there were large number of factors that affect the device performance and the comparison of measurements needed to be carried out with caution. There are two main categories of organic semiconductors that were used in OFETs, such as conjugated polymers and small conjugated molecules with low molecular weight. It was also revealed that the importance of the molecular ordering for fabricating high performance OFETs was more important in small-molecule-based transistors.