Mesoporous TiO₂-Based Photoanode Sensitized by BiOI and Investigation of Its Photovoltaic Behavior

We reported a novel BiOI/mesoporous TiO₂ photoanode for solar cells, which was fabricated with BiOI attached onto a three-dimensional mesoporous TiO₂ film by a chemical bath deposition (CBD) method. BiOI was revealed as an efficient and environmental friendly semiconductor sensitizer to make TiO₂ respond to visible light. Based on this photoanode, mesoporous TiO₂-based solar cell sensitized by BiOI exhibited promising photovoltaic performance. Meanwhile, the optimization of photovoltaic performance was also achieved by varying cycles of deposition immersions. The highest open circuit voltage and short circuit current of the solar cell can reach 0.5 V and 1.5 mA/cm², respectively.