2b06 Molecular orientation and field-effect mobility of pentacene thin films on very thin polyimide photo-alignment layers

Abstract

We have investigated the molecular orientation and field-effect mobility of pentacene thin films formed on very thin photo-aligned polyimide films. The exposure of linearly polarized light in photo-alignment treatment was varied up to 300 J/cm². The molecular orientation, field-effect mobility, surface morphology, and crystallinity of the pentacene films were determined by polarized infrared absorption, current-voltage characteristics of pentacene-field effect transistors, atomic force microscopy, and X-ray diffraction, respectively. Their light exposure dependence will be discussed.