Investigation on the Tunable-Length Zinc Oxide Nanowire Arrays for Dye-Sensitized Solar Cells

Figure 2

FE-SEM images of ZnO nanowires on the FTO conducting glass with different growth times: (a)-(b) for 30 minutes, (c)-(d) for 60 minutes, (e)-(f) for 90 minutes, and (g)-(h) for 120 minutes.

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