Design And Synthesis Of Conjugated Molecules For The Application Of Hole Transport Materials

With the development of the human soility,semiconductor materials have become an indispensable cornerstone in the development of science and technology.Highperformance organic semiconductor materials constructed by various organic ?-conjugated molecules have attracted attention due to their fully controllable frontier orbital energy levels,flexible chemical structures,large-scale preparation by simple solution processing methods and so on.In this work,a series of hole-transporting molecules were designed,synthesized,and characterized,which were further used in different electronic devices application fields by regulating the structure of conjugated molecules,such as e hole-transporting layer in the perovskite solar cells and p-type organic field-effect transistors.Through the adjustment of different molecular design concepts,high-performance devices were obtained.In addition,this work provides a series of useful and simple strategies for the development high-performance p-type semiconductors.In the second chapter of the main text,hydrogen bonding association and Pb-S intermolecular interaction forces were introduced into conjugated molecules,respectively,through which a series of dopant-free hole transport materials in the perovskite solar cells were designed.The results found that hydrogen bonding association(within the hole transport layers)and the Pb-S interaction(Pb from perovskite layer;S from the hole transport layer)could significantly improve not only the stability of the perovskite solar cells,but also the device efficiency.At the end,high performance perovskite solar cells were obtained.This work provides the two new molecular design concepts for the design high-performance dopant free hole transport materials in the perovskite solar cells.In the third chapter of the main text,two polymers based on benzodifuranone(BDF)and naphtodifuranone(NDF)were designed,synthesized,and characterized.The two polymers show similar chemical structures except the core of the BDF and NDF core,as a consequent,different planarity and ?-conjugate orbital polymers were obtained.Though the XRD,optical absorption,computation,and organic field-effect transistors study,we found that great potential of BDF/NDF-type chromophores in constructing novel organic semiconductors and also indicate that the main chain coplanarity of polymer semiconductors is more essential than the sole extension of ?-conjugations(especially at the perpendicular direction of polymer main chains)for the design of highperformance OFET materials.