Effect of thickness on the electrical properties of PEDOT:PSS/Tween 80 films
Joseph L. Carter, Catherine A. Kelly, Jean E. Marshall, Mike Jenkins
Abstract
Abstract The lower material and manufacturing costs of conductive polymers, particularly PEDOT:PSS, compared to indium tin oxide have led to significant research into their use in optoelectric devices. In this study, improvements of the electrical properties of PEDOT:PSS and PEDOT:PSS/Tween 80 via the production of multilayered films were investigated. A single layer of pristine PEDOT:PSS was found to give a sheet resistance of 1639 Ω□ –1 . The application of an additional three layers reduced this value to 29 Ω□ -1 , corresponding to an increase in conductivity from 2.6 to 18.3 Scm –1 . A similar trend was also found with formulations containing Tween 80. X-ray diffraction and Raman spectroscopy showed that the additional layers increased the crystalline order and induced a slight benzoid to quinoid shift. Surface profiling showed progressive increases in surface roughness with each additional layer of pristine PEDOT:PSS; however, this was mitigated by the presence of Tween 80 in the formulations.