Figure 2From: Efficiency improvement of InGaP/GaAs/Ge solar cells by hydrothermal-deposited ZnO nanotube structureSEM images and Energy dispersive spectrometer image of ZnO nanotubes. (a) Plan-view SEM images of the ZnO nanotube structure. (b) Energy dispersive spectrometer (EDS) image of ZnO nanotube.Back to article page