Study On Field - Effect Transistor Of Organic Semiconductors Based On Pyrrolopyrrolidone

In recent decades, organic field-effect transistors (OFETs) have attracted significant interest for their low-cost, flexible and large-area electronic applicationssuch as radio frequency identification (RF-ID) tags, flexible displays and sensors. Some prototypes of these products have been fabricated and are now getting close to the commercial market. Among π-conjugated systems, diketopyrrolopyrrole (DPP) has been gaining tremendous attention as a promising building block for organic electronic applications.In the first chapter, we summarizes the device structure and the working principle of organic field effect transistor. DPP and organic single crystals used in OFET applications are reviewed.In the second chapter, we examined the side chain effect on the mobility of DPP-based copolymers. OFET based on two DPP copolymers with alternating alkyl substituents were fabricated and tested.In the third chapter, we prepared ambipolar OFET with a DPP based polymer PTEDPP. The devices were optimized through the annealing process and changing the deposition conditionsIn the fourth chapter, we reported three DPP-based small molecules substituted by di(4-fluorophenyl), di(4-n-butyl-phenyl) or diphenyl groups. Aligned crystalline films of these molecules were grown from solutions at room temperature, exhibiting field-effect hole mobility as high as0.74cm2·V-1·s-1that is two order of magnitude higher than that of the spun films.