Figure 2.

Characterization of the hybrid active materials and 3D printing of the photodetector. A) Atomic force microscopy (AFM) images of active films with 0ZnO (i), 1ZnO (ii), 2ZnO (iii), and 3ZnO (iv). B) Root mean square (RMS) roughness of films printed with the active materials (n = 5). C) Normalized transmission spectra of active films. The insets are optical microscope images of active films. The scale bars are 50 µm. D) The dependence of contact angle on UV ozone treatment time (n = 5). The insets are images of droplets on the PDMS film. The scale bars are 1 mm. E) Images of printing steps of one photodetector. The scale bar is 5 mm. In B) and D), data are presented as mean ± SD.