Preferential perovskite surface-termination induced high piezoresponse in lead-free <i>in situ</i> fabricated Cs₃Bi₂Br₉-PVDF nanocomposites promotes biomechanical energy harvesting

Abstract

across 10 MΩ resistance when repeatedly hammered by the human hand. The nanogenerator is further employed to light up several LEDs and to charge capacitors with a small active area demonstrating significant promise for prospective wearables and portable devices and paving the way for high-performance nanogenerators using lead-free halide perovskites. Density functional theory calculations were performed to understand the interaction of the electroactive phase of the PVDF with different perovskite surface terminations to unravel the various interaction mechanisms and their ensuing charge transfer properties.