PEDOT:PSS as an alternative for an ITO electrode in liquid-crystal-based terahertz devices

Abstract

The properties of conducting polymer PEDOT:PSS were investigated as a potential candidate as a transparent electrode in the terahertz (THz) region. The transmittance of a PEDOT:PSS thin film in the THz region was found to be higher than 60 %. A twisted nematic cell (TN cell) was fabricated using the PEDOT:PSS thin film as an alternative for indium-tin-oxide (ITO) electrode. The transmittance at  = 633 nm of the TN cell put between crossed paralyzer was clearly decreased upon applying voltage higher than a threshold voltage. The result provided evidence that the PEDOT:PSS thin film worked as an electrode. The threshold voltage of the TN cell was 1.1 V at 1 kHz which was found to be almost same as an ITO electrode configuration.