Highly conductive PEDOT:PSS films by post-treatment with dimethyl sulfoxide for ITO-free liquid crystal display
Tsu-Ruey Chou1*, Szu-Hua Chen1, Yen-Te Chiang2, Yi-Ting Lin1, Chih-Yu Chao1,2
1Department of Physics, National Taiwan University, Taipei, Taiwan
2Institute of Applied Physics, National Taiwan University, Taipei, Taiwan
* presenting author:Tsu-Ruey Chou, email:trchou@phys.ntu.edu.tw
In this study, a simple and effective method to enhance the conductivity of poly(3,4-ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) thin films from 0.7 to 1185 S/cm by post-treatment with dimethyl sulfoxide (DMSO) is demonstrated. After the rubbing technique was applied, the DMSO-treated PEDOT:PSS film could be used as both the transparent electrode and the alignment layer to fabricate ITO-free liquid crystal (LC) cells. The electro-optical properties of LC cells fabricated by the rubbed PEDOT:PSS were comparable to those constructed by ITO and polyimide. This work indicates that the highly conductive PEDOT:PSS film is a promising material for ITO-free LC devices.


Keywords: ITO-free, PEDOT:PSS, Liquid crystal display