Publication

Abstract : Performance of energy storage devices, particularly metal-insulator-metal capacitors are evaluated mainly by leakage current and specific capacitance. The insulator material Ba0.5Sr0.5TiO3 shows high specific capacitance owing to its high relative permittivity. In this work, Ba0.5Sr0.5TiO3 nanopowder is synthesized using commercially available TiO2 nanopowder (ACS reagent grade) as well as using synthesized TiO2 nanopowder from Ti isopropoxide. The crystallinity and grain sizes of commercially available and synthesized TiO2 nanopowder differ. The effects of crystallinity and grain size of TiO2 nanopowder on specific capacitance and leakage current density of Ba0.5Sr0.5TiO3 ceramic based metal-insulator-metal capacitors are investigated in this paper. An 88 % reduction in grain size is achieved in TiO2 nanopowder synthesized from Ti isopropoxide compared to commercially available TiO2 nanopowder. A 45 % enhancement in specific capacitance and 57 % enhancement in leakage current are achieved in Ba0.5Sr0.5TiO3 ceramic based metal-insulator-metal capacitor synthesized using TiO2 nanopowder with lower grain size. The lower leakage current of metal-insulator-metal capacitor with Ba0.5Sr0.5TiO3 ceramic of low grain size is investigated with its structure using X-ray powder diffraction pattern analysis as well. The Ba0.5Sr0.5TiO3 ceramics synthesized using TiO2 nanopowder with lower grain size is a suitable candidate for insulator material in metal-insulator-metal capacitors for energy storage application.