Effect of Seed Layer Prepared under Various Heating Conditions on Growth of ZnO Nanorod Arrays for Dye-Sensitized Solar Cells

다국어 초록 (Multilingual Abstract)

A ZnO seed layer is prepared from ZnO sol under various heating conditions, whose effect on the growth of ZnO nanorod arrays for the photoanode in dye-sensitized solar cells (DSSCs) is systematically investigated.
Differential thermal analysis and x-ray diffraction investigation show that a pre-calcination temperature of at least 250°C is needed for the crystallization of the ZnO seed layer. Extreme preferential orientation along the (002) plane is also observed at 250°C. The post-annealing temperature governs the diameter and length of the vertically grown ZnO nanorod arrays. The diameter and length of the ZnO nanorod arrays increase till the post-annealing temperature reaches 500°C. At 600°C, the ZnO nanorod becomes shorter than that at 500°C. The longer and well-aligned ZnO nanorod arrays yield better photovoltaic performance. The optimum heating conditions to obtain the best conversion efficiency of DSSCs are found to be pre-calcination at 250°C and post-annealing at 500°C.

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