Fabrication and Characterization of an Anthocyanin-Sensitized TiO2 Solar Cell

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Chinese explanation / 中文解读

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Original abstract

Dye-sensitized solar cells (DSSCs) using natural organic photo-sensitizers offer a cost-effective, eco-friendly alternative to conventional silicon photovoltaics. In this study, an organic DSSC was fabricated using unpurified raspberry anthocyanin extract (predominantly cyanidin-3-O-sophoroside and cyanidin-3-glucoside) deposited onto a nanocrystalline titanium dioxide (TiO2) thin film with an iodide/triiodide redox electrolyte shuttle. Under halogen light illumination, the cell yielded an overall energy conversion efficiency of 0.00235%, consistent with the hypothesis of < 1% efficiency. Characterization across eight color filters showed the highest percentage of short-circuit current under yellow (69.6%) and orange (68.8%) filters, due to the incandescent source’s thermal emission spectrum as modeled by Wien’s approximation of Planck’s law. Furthermore, photon flux measurements revealed that short-circuit current scales linearly with incident illuminance due to photon-limited electron injection, whereas open-circuit voltage exhibits a weak logarithmic relation. Limitations on overall conversion efficiency were identified as semiconductor film thickness (45 µm), source heat dissipation, and competitive surface binding by non-photoactive impurities.

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