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We shall present a cosensitized solar cell with sequentially assembled CdS quantum dots (QDs) and black dye on a flower-like ZnO rod nanostructure. As revealed by UV-vis absorption spectrum and scanning electron microscopy CdS QDs and black dye can be effectively adsorbed onto a flower-like ZnO nanorod array. Besides acting as a sensitizer, CdS QDs layer helps to prevent formation of Zn2+/dye complex. CdS QDs also provide intermediate energy levels for excited electron transfer from black dye to ZnO film. A power conversion efficiency as high as 3.26% was achieved for CdS QD and black dye cosensitized ZnO photoanode under the illumination of one Sun (AM1.5G, 100 mW/cm2).
Selected Topics in Quantum Electronics, IEEE Journal of (Volume:16 , Issue: 6 )
Date of Publication: Nov.-Dec. 2010