Halides Perovskite Piezoelectric Nanogenerators As Electroskin for Electromechanical Energy Harvesting and Physiological Monitoring

Abstract

There have been countless breakthroughs in the developments of flexible and wearable electronics in recent years, and the technology has imposed the challenge on corresponding power devices that they should possess commensurate flexibility and functionality. We report a flexible perovskite piezoelectric nanogenerator that enables both biomechanical energy harvesting and physiological monitoring based on inorganic piezoelectric perovskite nanocrystals (CsPbBr3). For the first time, flexibility and transparency are concurrently accomplished for an energy-harvesting device. It demonstrates a high piezoelectric charge coefficient (d33) of 17.2 pm V−1. The flexible device shows an energy conversion efficiency of 7.81%. A maximum recordable piezoelectric output voltage of 16.4 V and current density of 604 nA under periodically bending-release cycles and ultimately driving wearable electronics with energy converted from human motions, whereas the nanogenerator is strain-sensitive, enabling its application as artificial electronic skin for pressure recognition. Our work provides new insights for multifunctional power sources and potential avenues to overcome challenges associated with the next generation wearable technology.