Fig. 6: System-level applications of the UTE-skin self-powered sensor arrays.

a Schematic diagram of the actively signal progressing system of the UTE-skin for human-machine interfaces. b Output voltage and (c) current of the UTE-skin upon finger touching and releasing. d Demonstration of operating the “Play” and “Next” instructions via triggering the self-powered UTE-skin. e Photograph of a spheric game controller with a 4 × 4 pixelated array and various demonstrations of the UTE-skin sensor array-enabled operating instructions, including “up”, “down”, “left”, and “right”. f Optical image and demonstrations of the UTE-skin sensor array using a self-powered active wearable cell phone panel.