![]() In recent years, the tendency of the research on polymer dielectrics has been toward printable, flexible, and biocompatible materials. This structure consisted of a thin PVP layer in contact with the semiconductor, which could induce good charge transport properties and a thick poly(vinyl acetate) (PVAc) layer as the bottom layer to realize good dielectric properties. introduced double polymer layers as the dielectric in OFET. In order to obtain such a balance, in 2004, Park et al. Thus, there is a contradictory selection between the high dielectric material and the low permittivity material. They found out that for a larger permittivity of the dielectric, the more charge carrier was localized at the surface of the dielectric. reported that the interaction between the dielectric and the semiconductor plays a crucial role in the charge carrier transport. The cross‐linked PVP with the capacitance of ~11–12 nF/cm 2 made the OFET yield a high carrier mobility of 3 cm 2/Vs. made a step further achievement as the “all‐polymer” circuit which integrated a 250 nm thick melamine cross‐linked poly(vinyl pyrrolidone) (PVP). The OFET had a field‐effect mobility of 0.01–0.03 cm 2/Vs. They employed polyimide as the dielectric and all the essential components were printed directly on the plastic. Then, in 1997, the first high performance plastic transistor was realized by Bao et al. They found that there was a strong correlation between the insulator's k value and the field‐effect mobility. The OFET was fabricated on glass using five kinds of polymer dielectrics. The first detailed study of different polymer dielectrics in OFET was reported by Peng et al. It is obvious that the capacitance magnitude is not only governed by the k value but also by the thickness of the dielectric. Where d is the thickness of the dielectric. Due to such kinds of polymer dielectrics, OFETs are available in versatile applications including sensor, inverter, and memory. ![]() Recently, with more and more polymer biomaterials engaged in the OFETs to serve as the dielectric, the resource of polymer dielectric has become environmentally friendly and very broad. Moreover, as the function dependent on the structure of polymer dielectric is readily available, to design and synthesize a structure with certain function becomes feasible, which results in complementary kinds of polymer dielectrics. Meanwhile, this capability has practical advantages when coupled with large‐scale production using the patterning technique. Apparently, the solution processable polymer dielectric is very attractive, for it is compatible with spin‐coating, casting, and printing at room temperature and under ambient conditions. Compared with the conventional silicon dioxide–based device, OFETs with polymer dielectrics are ideally compatible with flexible substrates and solution process. Organic field‐effect transistor (OFET) is an indispensable component in the field of organic electronics, which has been developed to realize low‐cost, flexible large‐area products, and biodegradable electronics.
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