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(a) Schematic diagram of the hyper-stretchable piezoelectric device in a layer by layer format and optical images of the device in initial and stretched status. (b) Schematic diagram of the fabrication process of the stretchable piezoelectric device. (c–e) Current outputs of the hyper-stretchable piezoelectric device subjected to stretch (200%) and release with different frequencies (c); bending to monitor the movement of human wrist (d); and pressure with human fingers (e).
