Hierarchical Nanostructures for Solar Cells - Hierarchical Nanostructures for Energy Devices - page 67

d n 3 r 4 n g | 9

.

Figure 4.4 SEM pictures of the ZnO nanowire hierarchical nanostructures for dye

sensitized solar cells (left column: top view, right column: cross sectional
view). (a) Vertically aligned nanowire carpet. (b) Short branched nano
weeping willow tree. (c) Long branched nano weeping willow tree. (e)
Pseudo-colored SEM picture of the long branched nano weeping willow
tree. Magenta colored nanowire represents backbone nanowire after first
growth and purple colored nanowires represents branch nanowires after
second growth. (f) I-V curve of dye-sensitized solar cell made from the
long branched nano weeping willow trees of ZnO nanowires.
Reproduced with permission from ref. 12.