Figure 2
From: Visible and UV photo-detection in ZnO nanostructured thin films via simple tuning of solution method

UV-Vis spectroscopy absorbance spectra. (a) NPs having excitonic peak at 315 nm and extended absorbance in the visible spectrum region, (b) NSs having excitonic peak at 355 nm and showing extended visible region, (c) NFs having excitonic peak at 365 nm with comparatively higher absorbance, and (d) shows increasing absorbance from NPs to NSs and then to NFs.