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A dye-sensitized solar cell based on natural betalain pigments from red beet roots is described. Reddish-purple betanin is an easily oxidized, water-soluble pigment with strong visible light absorption, having a maximum molar absorptivity of about 65,000M −1 cm −1 at 535nm. A photoanode was fabricated from nanocrystalline TiO 2 on transparent conductive glass, treated with...
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