High-Performance Field-Effect Transistor Based on Novel Conjugated P-o-Fluoro-p-alkoxyphenyl-Substituted Polymers by Graphdiyne Doping

The novel two-dimensional graphitic material, graphdiyne (GDY), has attracted great interest due to its superior stability and natural semiconductor characteristic. We realize the obvious improvement of carrier transport characteristics of P- o -FBDTP–C8DTBTff (PFC; o -FBDTP, o -fluoro- p -alkoxyphenyl-substituted benzo[1,2- b:4,5- b ′]dithiophene; C8DTBTff, 5,6-difluoro-4,7-di(4-(2-ethylhexyl)-2-thienyl)-2,1,3-benzothiadiazole) organic polymer semiconductor via adding GDY. The result of the field effect transistor measurement suggests that doping GDY can dramatically improve the on/off ratio and threshold voltage of the organic semiconductor. Especially the mobility of GDY/PFC film is 2 orders of magnitude higher than that of pristine PFC, demonstrating the important role of GDY dopant. Besides, the carrier diffusion length of GDY/PFC film is also enhanced, suggesting the great potential applications of GDY-modified polymer with donor–acceptor units in organic photoelectric devices.