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Dependence on the parameters of the equivalent electrical circuit model with the thickness of viologen-based electrochromic mixture on glass substrate devices

  • David Barrios (a1), Ricardo Vergaz (a1), Juan Carlos Torres (a1), José-Manuel Sánchez-Pena (a1), Ana Viñuales (a2) and M. Salsamendi (a2)...

Abstract

Several viologen electrochromic devices with different thicknesses on glass substrates were constructed, using a mixture of 4,4’-bipyridine and 1-bromoethane. The thickness of each device was fixed using a thermoplastic spacer. The devices were electrochemically tested with optical and impedance analysis. The range of the transmittance change is highly dependent on thickness. The electrical behavior of the material and the physical and chemical characteristics are derived from the proposed electrical equivalent circuit model. A simple Randles circuit including a Warburg diffusion impedance element, a charge transfer resistance and a double layer capacitive element is proposed for the fittings process. Variations on thickness of internal layer of devices lead to use a short or an open circuit Warburg element. A threshold potential, from which the device is colored, indicates the charge diffusion effects.

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1. Monk, P. S., in The Viologens: Physicochemical Properties, Synthesis and Applications of the Salts of 4,4’-Bipyridine (John Wiley & Sons, 1999).
2. Pozo-Gonzalo, Cristina, Salsamendi, Maitane, Viñuales, Ana, Pomposo, Jose A., Grande, Hans- Jürgen, Sol. En.Mat. and Sol.Cells 93, 2093 (2009).
3. Vergaz, Ricardo, Barrios, David, Sánchez-Pena, José M., Pozo-Gonzalo, Cristina, Salsamendi, Maitane, Pomposo, José A., Displays 29, 401 (2008).
4. Vergaz, Ricardo, Barrios, David, Sánchez-Pena, José-Manuel, Pozo-Gonzalo, Cristina, Salsamendi, Maitane, Sol. En.Mat. and Sol.Cells 93, 2125 (2009).
5. Bruinink, J., Kregting, C.G.A., Ponjeé, J.J., J. Electrochem. Soc., 124, 1854 (1977).

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Dependence on the parameters of the equivalent electrical circuit model with the thickness of viologen-based electrochromic mixture on glass substrate devices

  • David Barrios (a1), Ricardo Vergaz (a1), Juan Carlos Torres (a1), José-Manuel Sánchez-Pena (a1), Ana Viñuales (a2) and M. Salsamendi (a2)...

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