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Poly(3-hexylthiophene)/[6,6]-phenyl C61-butyric acid methyl ester bulk hetero-junction photovoltaic cells doped with indigo dye as a p-type solar collector were studied. Doping indigo increases the absorption of the visible light spectrum, as determined using ultraviolet–visible spectrophotometry analysis. The photocurrent was measured in air under a solar simulator with AM 1.5G illumination (100mW/cm...