Synthesis And Characterization Of Novel Organic Small Molecules And Polymer Materials For Field Effect Transistor

As the basic component of electronic equipment,Field effect transistor?FET?is used widely in electronic products.Among them,the organic field effect transistor,which based on the organic semiconductor materials,has attracted more and more attention and got great progress,due to its small size,light weight,low preparation cost,easy to micro/nano integration and other advantages.However,there is still a lot of challenge problems for its industrialization and commercialization.In this dissertation,in order to develop the organic semiconductor material,which is the most important component of the field-effect transistor,some novel organic small molecules and polymer semiconductor materials were designed and synthesize.The physical and chemical properties of materials were characterized by UV-vis,TGA and DSC.The OFET device were fabricated and the electric performance were measured.The main research contents are as follows:1?The two-dimensional condensed ring compound ATBF with H-type shape was designed and synthesized.The electrochemical,photophysical and thermal properties were characterized by cyclic voltammetry,UV-vis absorption spectrum,UV-AES and TGA.The large crystal and the small crystal of ATBF with micro and nano size were grown by the physical gas-phase transport method,and the single crystal structure was analyzed by X-ray diffraction.The micro-and nano-size single crystals were characterized by AFM,SEM and TEM respectively.The single crystal OFET device based on ATBF was fabricated by using the bottomgate top contact configuration,and its electrical properties were studied.The best single crystal mobility is up to 0.78 cm²v^-1 s^-1.Moreover,it was found that the synergetic effect between the S…S action and?-?action can promote their molecular stacking and transistor performance.2?A linear copolymer BBTTCN was designed and synthesized with the C14-TTBT and dicyano-substituted bromo-cyclofluorene-dithiophene as the structural units.The molecular weight of the copolymer was characterized by GPC.Its photophysical and thermal properties were characterized by UV-vis,TG and DSC respectively.The thin film FET device was fabricated by the solution method with the mode of bottomgate top contact.The results show that the polymer is bipolar material with the hole mobility of 9.03x10^-3cm²v^-1s^-1,and the electron mobility of is 2.66x10^-4 cm²v^-1s^-1.3?A serials of copolymers were designed and synthesized with the benzothiadiazole?BTZ?and thiophene-vinyl-thiophene(C₁₂-BTTE)as the structural units.The C₁₂-BTTE was substituted with different halogen atoms in order to clarify the effects of different halogen atoms on the properties of the copolymers.The photophysical and thermal properties were characterized by UV-vis,TG and DSC respectively.The thin film FET device was fabricated by the solution method and the results show that all three polymers are bipolar materials.4?A serials of three component copolymers were designed and synthesized with the DPP,3,4-difluorothiophene and thiophene as the structural units.Among them,thiophene was used as the main body,and the proportion of DPP and 3,4-difluorothiophene was adjusted to balance the effect of different proportion on the copolymer.The photophysical and thermal properties were characterized by UV-vis,TG and DSC.The thin film FET device was fabricated by the solution method and the results show that all three polymers are bipolar materials.The results show that the polymer has a p-type maximum mobility of 0.286 cm²V^-1s^-1.5?Four copolymers were designed and synthesized with C12-TT,C16-TT,tetrafluorobenzene and difluorothiophene as the structural units.The 3,4-difluorothiophene and 1,2,4,5-tetrafluorobenzene were introduced,respectively,to adjust the carrier transport properties of copolymers based on the different number of fluorine atoms.The photophysical and thermal properties were characterized by UV-vis,TG and DSC.6?A star-shaped network polymer 3TB2T was designed and synthesized with the C₁₄-TTBT and benzotrithiophene as structural units.