Our study is focused on the relationship between the structural coherence and intrinsic carrier transport in a regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT) nanofiber, particularly in an isolated nanofiber, formed in various ratios of good and poor solvent mixtures. The P3HT nanofiber, which is formed in solvent mixtures, had a whisker structure with the length of several μm, the height decreased from 9 to 2 nm as estimated by scanning force microscope observation, and the structural coherent length along the longitudinal axis increased from 40 to 59Å as determined by x-ray-diffraction measurement, with increasing ratio of the good solvent. The I -V characteristics measured by the four-probe method showed that the activation energy of hopping conduction, which was considerably related with the structural disorder, decreased with increasing ratio of the good solvent. Moreover, the field-effect-transistor characteristics of the nanofiber showed that the carrier mobility increased with increasing ratio of the good solvent, and the nanofiber formed under the good-solvent-rich condition showed the mobility from 3.8 × 10 −2 to 5.6 × 10 −2 cm 2 V −1 s −1 . The tendency of the mobility to increase has been explained on the basis of the change in the structural coherent length and thermal activation energy, assuming the model that regarded the nanofiber as a one-dimensional array of electronically coherent regions and incoherent defects, and hence the relationship between the structural coherence and carrier transport has been clarified.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.