Multicomponent Blend Systems Used in Organic Field-Effect Transistors: Charge Transport Properties, Large-Area Preparation, and Functional Devices

As important foundational devices of organic electronics, organic field-effect transistors (OFETs) have great potential in logic circuits, radio frequency tags, and flexible backplanes. Structural engineering and device optimization lead to the high mobilities of OFETs comparable to or even exceeding those of amorphous silicon transistors. However, meeting the requirements of practical applications is still challenging in terms of the device stability, uniformity, and large-area preparation. Meanwhile, the development of functional OFETs has also entered an era full of opportunities and challenges. To solve the current dilemma, a growing number of studies have demonstrated that using multicomponent blend systems is an effective way to promote the development of OFETs. Blending two or more components can combine the advantages of each component and provide enhanced properties that behave differently from those in single-component systems. This method has proven to improve the performance in many electronics applications. In this review, multicomponent systems used in OFETs are summarized to clarify the important implications, including the influence on the charge transport properties, combination with processing techniques, and applications in stretchable electronics, gas sensors, phototransistors, and nonvolatile memory devices. In brief, multicomponent blend systems can pave the way for the development of OFETs.