Application of a rapid graphical method for the design of electrochromic devices

John N. Bullock; Howard M. Branz

doi:10.1117/12.217328

23 August 1995 Application of a rapid graphical method for the design of electrochromic devices

John N. Bullock, Howard M. Branz

Proceedings Volume 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV; (1995) https://doi.org/10.1117/12.217328
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Recently, Rauh and Cogan presented a model for the thermodynamic equilibrium optical and electrical properties of electrochromic optical modulation devices. Such an empirically based, predictive model is very useful in the engineering design of practical electrochromic devices. The existing model, however, requires considerable computation to model the effects of changes in important device parameters such as layer thicknesses and total mobile ion charge. We present a simple, graphical technique for evaluating the equilibrium electrochemical interaction of two electrochromic layers at any applied voltage based on independent, empirical, back-EMF measurements of the materials. Our technique allows extremely rapid evaluation of different candidate materials, layer thicknesses, and total ion charges. We present the results of the model for Li-based electrochromic devices employing WO and VO layers with an emphasis on design for low coloration voltage.

Citation Download Citation

John N. Bullock and Howard M. Branz "Application of a rapid graphical method for the design of electrochromic devices", Proc. SPIE 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV, (23 August 1995); https://doi.org/10.1117/12.217328

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