Piezoelectric energy harvesting of a bismuth halide perovskite stabilised by chiral ammonium cations

Abstract

Lead-free hybrid perovskite piezoelectrics have gained enormous attention due to their nontoxic metal content and notable physical properties. In this work, we report a bismuth-bromide-based perovskite-structured material stabilized by chiral ammonium cations. The enantiopure hybrid 1D-network of composition {[^sCH(MePh)(Me)NH₃][BiBr₅]}_n (1-S) is crystallized in the piezoelectrically active orthorhombic space group P₂₁₂₁₂₁. The piezoelectric measurements on the compacted pellet of 1-S gave a piezoelectric coefficient (d₃₃) value of 2.6 pC/N. The dielectric permittivity measurements yielded the real part of the complex dielectric constant (ε′) value of 6.68 at room temperature and 1 kHz frequency. Furthermore, the piezoelectric energy harvesting applications were performed on the composite films of 1-S with polylactic acid (PLA) polymer. A considerable output voltage of 10.4 V was obtained for the 15 wt% 1-S-PLA composite film. Energy storage application was studied by charging a 100 μF capacitor by using the best performing 15 wt% 1-S-PLA device that reaches its maximum charging point in 60 seconds.