Electrochromic switching with nanocrystalline TiO2 semiconductor films

Anders Hagfeldt; Nicolaos Vlachopoulos; Scott Gilbert; Michael Graetzel

doi:10.1117/12.185430

9 September 1994 Electrochromic switching with nanocrystalline TiO₂ semiconductor films

Anders Hagfeldt, Nicolaos Vlachopoulos, Scott Gilbert, Michael Graetzel

Proceedings Volume 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII; (1994) https://doi.org/10.1117/12.185430
Event: Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, 1994, Freiburg, Germany

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.

Citation Download Citation

Anders Hagfeldt, Nicolaos Vlachopoulos, Scott Gilbert, and Michael Graetzel "Electrochromic switching with nanocrystalline TiO₂ semiconductor films", Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); https://doi.org/10.1117/12.185430

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