Organization of charge-carrier pathways for organic electronics

The melt processing of all-hydrocarbon HBC derivatives, providing control of the columnar structure orientation on a substrate was presented. The morphology was locally investigated using a synchrotron radiation (SR) microfocussed X-ray beam to probe the local columnar orientation. A time-of-flight (TOF) technique was utilized to determine the charge -carrier mobility, which allowed the order and the orientation of the molecules to be correlated with the charge-carrier migration. The crystallization textures from the isotropic state were investigated by thermally controlled polarization optical microscopy (POM) experiments to elucidate their supramolecular organization. 2D wide-angle X-ray scattering (2D-WAXS) experiments were performed using an SR-source microfocus X-ray beam to gain further structural insight. The TOF results revealed that the quality of the organization and the molecular orientation is crucial for the charge-carrier mobility.