Photo-Electrochemical Effects of WO3 Electrochromic Devices

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Abstract
The photo-electrochemical effects of electrochromic cells on WO3 electrodes are investigated. Electrochromic cells are fabricated using a WO3 electrode, a transition metal oxide counter electrode and a propylenecarbonate solution of LiClO4. The photovoltage can be detected when the cells are half or well bleached, but is undetectable with well colored ones. The photocurrent of the cell is anodic and about 0.6 µA/cm2 when illuminated by an Hg lamp, when a 1 M/l LiClO4 electrolyte is used. These photo-effects are most likely due to the nature of the n-type WO3 semiconductor.

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