Application Of Isoindigo New Organic Semiconductor Materials In Organic Field-effect Transistor

Organic semiconductor materials,especially donor acceptor(D-A)polymers,are increasingly used in organic optoelectronic devices,such as field effect transistors(OFET)and organic solar cells(OSC).Based on various structure modified D-A polymers,a large number of high-performance OFET and OSC have been achieved.As a basic component of D-A polymers,the receptor component has attracted widespread attention.In this thesis,we have designed and synthesized novel receptor molecules and DA polymers based on isoindigo(IIDG),using IIDG as the core molecule,by regulating the molecular structure,and applied them to n-type and p-type organic field effect transistors,respectively.Through adjusting different design concepts,devices with better performance have been obtained,and molecules have been characterized through various test methods and theoretical simulation calculations,providing new design ideas for researchers with IIDG as the core of their work.In the second chapter of the text,we introduced the double B ← N group and fluorine atom into the IIDG unit,and extended it with π conjugation.The presence of fluorine atoms and B ← N groups can effectively reduce the LUMO energy level,and effective π conjugation expansion can also improve molecular stacking.This is the reason why n-type semiconductors have high electron mobility.IIDG-AB may be a promising electron deficient unit for constructing high-performance n-type semiconductors,but its physical properties and OFET behavior have not been studied.The results show that the IIDG-AB molecule has indeed achieved a transition from ptype to n-type and achieved a certain electron mobility,which has developed a new design idea for n-type semiconductor materials based on IIDG.In the third chapter of the text,we introduced the concept of intermolecular hydrogen bonds into IIDG molecules.The main strategy is to retain the hydrogen on the amide nitrogen at the core of one side of the IIDG molecule,and introduce alkyl chains on the other side for solubilization.Hydrogen bonds can be formed between molecules.Four polymers have been synthesized.The role of hydrogen bonds has been explored through different test methods.The results show that the presence of hydrogen bonds can improve the molecular stacking to a certain extent,and the good film-forming properties of polymers can effectively improve the carrier transport efficiency.The design concept of hydrogen bonds also provides a new direction for researchers to modify IIDG molecules.