Comparison of performance parameters of poly(3,4 ethylene-dioxythiophene) (PEDOT) based electrochromic device on glass with and without counter electrode

摘要

Conjugated polymers are promising materials for electrochromic device technology. Aqueous dispersions of poly(3,4-ethylenedioxythiophene)-(PEDOT) were spin coated onto transparent conducting oxide (TCO) coated glass substrates. A seven-layer electrochromic device was fabricated with the following configuration: glass/transparent conducting oxide (TCO)/PEDOT (main electrochromic layer)/gel electrolyte/ Prussian blue (counter electrode)/TCO/glass. The device fabricated with counter electrode (Prussian blue) showed a contrast of 18 percent and without counter electrode showed visible contrast of 5 percent at 632 nm at a voltage of 1-9 V. The comparison of the device is done in terms of the colouration efficiency of the devices with and without counter electrode.