Abstract
Sol-modified ZnO (SM-ZnO) photoanodes for high-efficient dye-sensitized solar cells (DSSCs) were prepared. The influence of sol on the crystallinity and morphology of ZnO films was investigated by x-ray diffraction and scanning electron microscopy (SEM). Compared with unmodified ZnO-based DSSCs, the conversion efficiency of SM-ZnO-based DSSCs increased from 2.03% to 2.83%, which may be attributed to forming a uniformly distributed ZnO nanocrystalline photoanode and exhibiting a more efficient charge-transfer process, as evidenced from SEM and electrochemical impedance spectroscopy. The conversion efficiency was further increased to 3.13% by constructing an SM-ZnO/compact ZnO two-layer photoanode.
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