磁场下液晶小分子与P3HT二元体系的形貌与光电性能

he 4-cyano-4''-pentylterphenyl (5CT) and 2, 2''-dioctylterthiophene (8-TTP-8) are two kinds of liquid crystals (LCs) with different structures, which are selected as LCs additives to blend with P3HT with different weight ratio. By applying a low-intensity magnetic field of 1 T in the process of solvent-evaporation, the liquid crystal molecules firstly self-assemble into ordered structures and then as a template to induce the crystallization of P3HT. The results show that both 5CT and 8-TTP-8 can assemble in the magnetic field of 1 T, which is served as the template to induce the crystallization of P3HT, strengthen the π-π stacking of P3HT molecular chain, improve the crystallinity of P3HT and induce P3HT to form nanofibers. The P3HT nanofibers can enhance the carrier mobility of P3HT films. When blending P3HT with 8-TTP-8 and in the presence of magnetic field, the carrier mobilities of P3HT films increase from 1.092×10-4 cm2/Vs to 3.346×10-4 cm2/Vs. When 5CT is added, the carrier mobilities of P3HT films increase from 1.092×10-4 cm2/Vs to 3.114×10-4 cm2/Vs. The carrier mobilities increase about 3 times. Therefore, under the external treatment of magnetic field, the liquid crystal can induce the formation of P3HT nanofibers and improve carrier mobility of film.