Figure 3.

3D printed photodetector arrays printed on planar and spherical surfaces. a. 5 × 8 photodetector array printed on PET. b. Photographs of the bent photodetector array on PET films, viewed from both sides. c. Characterization of the flexible photodetector array as an image sensor. Optical patterns projected onto the photodetector array and the reconstructed images: I, square pattern; II, letter “M”; and III, white light parallel strips with varying intensities. The range of the greyscale bars are from 0 (black) to 300 nA (white). d. Photographs of the concentric photodetector array printed onto the inner surface of a hemispherical glass dome: I, inside view and II, outside view of the 3D printed concentric photodetector array. e. Current-voltage characteristics of the photodetector highlighted in Figure 3d. The excitation light source is a 405 nm laser of varying intensities. f. Characterization of the spherical photodetector array as an image sensor. I, the projected cross mark onto the devices (denoted by the dashed outline); II, reconstructed cross mark pattern; III and IV, cross mark pattern projected onto the spherical photodetector array rotated 90° and the reconstructed cross mark pattern. The range of the greyscale bar is from 0 (black) to 300 nA (white). Scale bars are 5 mm.