ABSTRACT The increasing need for small, portable, and Internet of Things (IoT) devices requires exploring alternatives to conventional power sources. We present a flexible and self‐sustainable piezoelectric nanogenerator composed of 2D organic‐inorganic halide perovskite, namely guanidium lead iodide (GA 2 PbI 4 ) and polyvinylidene fluoride (PVDF) composite. By systematically incorporating optimized concentration of GA 2 PbI 4 into the PVDF matrix, the electroactive phase content of the composite could be substantially enhanced to a maximum value of 90% for a 4 wt.% loading of the perovskite. The piezoelectric coefficient consequently increases from ∼7.46 pC/N for pure PVDF to ∼39.5 pC/N for the 4% filler loading in the PVDF matrix. The optimized device generates an open circuit voltage of ∼60 V and a short circuit current of 6.4 µA. The device delivers a power density of ∼8.58 µW/cm 2 across a 12 MΩ load, sufficient to power small capacitors and an array of LEDs. In addition to the remarkable energy harvesting capability, the composite demonstrates appreciable photosensitivity under light irradiation, acting as a potential self‐powered photodetector. The fabricated self‐powered photodetector exhibits an increase in the short circuit current under light illumination, highlighting the potential of GA 2 PbI 4 /PVDF composites as wearable energy harvesting devices and real‐time, wireless, IoT‐enabled self‐powered photodetectors.
Kumar et al. (Mon,) studied this question.
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