Figure 4.

Stability and stretchability of the 3D printed photodetectors. A–C) Current response of a photodetector to 310 nm, 360 nm, and 520 nm on/off modulated light, respectively, in the last 8 h of a test period of 14 h. The light intensities used in A–C) are ≈4.6, 9.2, and 21.1 µW cm^–2, respectively. The insets are magnified views of current responses. D) Bending test of the photodetector (n = 5). The left and right insets are the photodetectors undergoing curvatures of 0.46 and 1.37 cm^–1, respectively. The scale bars are 10 mm. E) Photocurrent and dark current of the photodetector at varying tensile strains (n = 5). F) Images showing a photodetector under 0% (i) and 29.3% (ii) strain, respectively. The scale bars are 10 mm. (iii) and (iv) are optical microscope images of the sensing areas in (i) and (ii), respectively. The scale bars are 1 mm. In D) and E), data are presented as mean ± SD.