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Multi-layer electrode for high contrast electrochromic devices

United States Patent

8,049,949
November 1, 2011
View the Complete Patent at the US Patent & Trademark Office
An electrochromic device includes a first substrate spaced from a second substrate. A first transparent conductive electrode is formed over at least a portion of the first substrate. A polymeric anode is formed over at least a portion of the first conductive electrode. A second transparent conductive electrode is formed over at least a portion of the second substrate. In one aspect of the invention, a multi-layer polymeric cathode is formed over at least a portion of the second conductive electrode. In one non-limiting embodiment, the multi-layer cathode includes a first cathodically coloring polymer formed over at least a portion of the second conductive electrode and a second cathodically coloring polymer formed over at least a portion of the first cathodically coloring polymer. An ionic liquid is positioned between the anode and the cathode.
Schwendeman; Irina G. (Wexford, PA), Finley; James J. (Pittsburgh, PA), Polcyn; Adam D. (Pittsburgh, PA), Boykin; Cheri M. (Wexford, PA)
PPG Industries Ohio, Inc. (Cleveland, OH)
12/ 545,441
20100060971
August 21, 2009
This invention was made with Government support under contract number DE-FC26-06NT42763 awarded by the U.S. Department of Energy. The United States Government has certain rights in this invention.