This is because TiO2-based cells are generally insensitive to prolonged sensitization times because of the higher chemical stability of TiO2. Through systematic optimization of the film thickness and the dye adsorption time, the highest overall conversion efficiency achieved in this study was 5.61%, obtained from a 26-μm photoelectrode sensitized for 2 h. The best-performing cell also showed remarkable at-rest stability, retaining approximately 70% of its initial efficiency after more than 1 year of room-temperature storage in the dark. Acknowledgements The authors acknowledge the financial support A-1210477 mw from the Bureau of Energy, Ministry of
Economic Affairs, Taiwan (project no. B455DR2110) and National Science Council, Taiwan check details (project no.
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