Publication date: 1st April 2013
Co-sensitization between inorganic metal complex dye and semiconductor quantum dots (QDs) have produced a better performance in dye-sensitized solar cell (DSSC).1 Effort to reduce the cost of the materials has prompted for the application of natural dye as a substitute for metal complex dye. In this study, anthocyanin extracted from black rice (Oryza sativa) has been used as natural dye for sensitizing mesoporous TiO2 layer. With natural dye as sole sensitizer, the solar cell performs better under cobalt(II/III)-based liquid electrolyte with efficiency of 0.11%. By co-sensitizing natural dye with CdS and/or CdSe QDs, the solar cell performance is improved. Though better performance is observed in CdS/natural dye-sensitized solar cell with iodide-based liquid electrolyte, stability has become an issue. Efficiency of 0.64% was obtained with this setup. The low performance of the solar cell with co-sensitization of natural dye and QD is attributed to the high recombination rate as observed in electrochemical impedance spectroscopy (EIS) study.
1. Mora-Sero I.; Dittrich T.; Susha A.S.; Rogach A.L.; Bisquert J. Large Improvement of Electron Extraction from CdSe Quantum Dots into a TiO2 Thin Layer by N3 Dye Coabsorption. Thin Solid Films 2008, 516, 6994-6998.
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