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Proceedings Paper

Electrochromic switching with nanocrystalline TiO2 semiconductor films
Author(s): Anders Hagfeldt; Nicolaos Vlachopoulos; Scott Gilbert; Michael Graetzel
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Paper Abstract

Forward biasing of transparent nanocrystalline TiO2 (anatase) films in lithium ion containing organic electrolytes leads to rapid and reversible coloration due to electron accumulation and Li+ intercalation in the anantase lattice. Absorption of > 90 percent light throughout the visible and near IR can be switched on and off within a few seconds. The nanocrystalline morphology of the film plays a primordial role in enhancing the electrochromic process. Preliminary results from the reduction of a surface attached viologen molecule leading to a blue coloration of the film are reported.

Paper Details

Date Published: 9 September 1994
PDF: 8 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185430
Show Author Affiliations
Anders Hagfeldt, Ecole Polytechnique Federale de Lausanne (Switzerland)
Nicolaos Vlachopoulos, Ecole Polytechnique Federale de Lausanne (Switzerland)
Scott Gilbert, Ecole Polytechnique Federale de Lausanne (Switzerland)
Michael Graetzel, Ecole Polytechnique Federale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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