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A new electrochromic device (ECD) is developed by tungsten oxide (WO 3 ) thin film integrated with a-Si 1-X Ge X :H pin photodetector. With the addition of the palladium (Pd) film to ionize hydrogen gas, the WO 3 thin film will react with hydrogen ion and transfer from transparency to blue color. This color change will degrade the absorption of light with...
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