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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

Published online by Cambridge University Press:  18 August 2011

David Barrios ,
Ricardo Vergaz ,
Juan Carlos Torres ,
José-Manuel Sánchez-Pena ,
Ana Viñuales  and
M. Salsamendi
David Barrios
Affiliation:
Grupo de Displays y Aplicaciones Fotónicas, Dept. Tecnología Electrónica, Universidad Carlos III de Madrid, C/Butarque, 15, E28911, Leganés, Madrid, Spain
Ricardo Vergaz
Affiliation:
Grupo de Displays y Aplicaciones Fotónicas, Dept. Tecnología Electrónica, Universidad Carlos III de Madrid, C/Butarque, 15, E28911, Leganés, Madrid, Spain
Juan Carlos Torres
Affiliation:
Grupo de Displays y Aplicaciones Fotónicas, Dept. Tecnología Electrónica, Universidad Carlos III de Madrid, C/Butarque, 15, E28911, Leganés, Madrid, Spain
José-Manuel Sánchez-Pena
Affiliation:
Grupo de Displays y Aplicaciones Fotónicas, Dept. Tecnología Electrónica, Universidad Carlos III de Madrid, C/Butarque, 15, E28911, Leganés, Madrid, Spain
Ana Viñuales
Affiliation:
Center for Electrochemical Technologies (CIDETEC), Dept. Nuevos Materiales, Parque Tecnológico de San Sebastián - Paseo Miramón, 196, E-20009, San Sebastián, Spain
M. Salsamendi
Affiliation:
Center for Electrochemical Technologies (CIDETEC), Dept. Nuevos Materiales, Parque Tecnológico de San Sebastián - Paseo Miramón, 196, E-20009, San Sebastián, Spain
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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.

Keywords

diffusionoptical propertieselectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1328: Symposium H – Electrochromic Materials and Devices , 2011 , mrss11-1328-h03-04
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

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