Anisotropic charge transport in highly oriented films of semiconducting polymer prepared by ribbon-shaped floating film

摘要

Fabrication of large area and uniform thin films with preferred edge-on orientation is highly demanded for flexible organic electronic devices. In this work, utilization of a newly designed slider in the floating film transfer method to assist unidirectional film spreading led to the fabrication of uniform and macroscopically edge-on oriented ribbon-shaped floating films (15 cm x 2 cm) having very large optical anisotropy (20). The results pertaining to the in-plane grazing angle incident X-ray diffraction (GIXD) and phi-scan measurements revealed the well-stacked polymer backbone conformation with edge-on orientation without any inter-mixing of face-on oriented counterparts. Optical anisotropy dependent charge transport in organic field effect transistors using anisotropic poly(3,3 '''-didodecyl-quaterthiophene) films has also been shown, and the results are supported by polarized electronic absorption and GIXD measurements. Published by AIP Publishing.