Abstract:Because of the regularity of the nanowire and its large length to diameter ratio, it can greatly improve the electron mobility along the nanowire growth direction, therefore nanowire become the research focus in the photoelectric polymer field. Literature shows that external field can influence the order degree of polymer chain. In order to investigate the effect of the external field on the order degree of poly(3-alkylthiophene) chains in detail, by using UV-Vis spectroscopy and AFM, the influence of the rotating shearing field, the ultraviolet radiation, and the ultrasonic treatment field on the crystallization behavior of the P3HT/mixed solvent (CHCl3 + CH2Cl2, 1:2 volume ratio) was investigated in this paper. It is worthy that the in-situ UV-Vis characterization for the effect of the rotating shearing field on the structure is performed on the home-made instrument. It shows that under the rotating shear field, ultraviolet irradiation and ultrasonic treatment, the degree of crystallization and aggregation of P3HT / mixed solvents is different. The degree of crystallization of P3HT is significantly improved by rotating at 1500 rpm for 24 hours, and under ultraviolet light of 254 and 365 nm for 20 minutes. The crystallinity of P3HT solution is also improved. The external fields have not changed the H aggregation of the nanowires. In addition, we also studied the "memory effect" of P3HT solution crystallization. The results show that the crystal microstructure and morphology change depends on different initial state of the P3HT solution. Through the research of this paper, we expect to deepen the understanding of conductive polymer crystallization behavior, and provide theoretical guidance to improve the device property using conductive polymer as the active layer.