Optical anisotropy of aligned pentacene molecules on a rubbed polymer corresponding to the electrical anisotropy

We report on the optical anisotropy of a pentacene film on a rubbed (poly)vinylalcohol (PVA) layer related to the electrical performances of the pentacene organic field effect transistors (OFETs) depending on the direction of a current flow. The optical anisotropies of the PVA films are negligible with respect to whether or not rubbing process. In the pentacene OFET on the rubbed PVA layer, however, the optical anisotropy is observed and the anisotropy of the electrical performances directly corresponds to the optical anisotropy of the pentacene thin-film on the rubbed PVA layer. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.This work was supported in part by the Ministry of Knowledge Economy of Korea through the 21 st Century Frontier Research and Development Program at the Information Display Center. C.-J. Yu would like to acknowledge financial support from the Korea Research Foundation Grant funded by the Korean Govement (MOEHRD, Basic Research Promotion Fund) (KRF-2008-331-D00385)