Figure 4
From: Efficient piezoelectric ZnO nanogenerators based on Au-coated silica sphere array electrode
Schematic diagram and photograph of ZnO NRA-based NG. (a) Schematic diagram of ZnO NRA-based NG with the Au-coated silica sphere array as a top electrode, (b) FE-SEM image of the grown ZnO NRAs on ITO/PET via the ED method, (c) photographic image of the fabricated sample, and (d) measured output signals in terms of current and voltage for the corresponding sample, in comparison with a background signal.