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A device of multiple nano-TiO 2 layers was proposed and fabricated to prevent a dye/nano-TiO 2 region from serious photo-degradation. In this device, the top of the dye/TiO 2 region was designed to be coated using sol–gel nano-TiO 2 thin films to shield UV irradiation from the photo-degradation effect. The sol–gel TiO 2 was prepared in a low temperature (75°C)...
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