“…27−29 Despite their high performance, inorganic materials used as piezoelectric active layers such as zinc oxide, 30,31 BaTiO 3 , 32,33 and PZT 34,35 exhibit rigidity and mechanical brittleness, which limit their utilization in flexible energy harvesters and wearable devices. In this case, piezoelectric polymers like polyvinylidene fluoride (PVDF) 36,37 have drawn a lot of interest from researchers due to their superior machinability and mechanical flexibility. 38,39 PVDF has many excellent properties, such as low cost, lightweight design, chemical stability, adjustable strain modulus, ease of shaping, low power consumption, biocompatibility, and biodegradability, which are vital parameters required for the sustainable progress of stretchable/flexible energy harvesting and wearable devices.…”