Synthesis and Performance Evaluation of Ba_xSr_{1 –x}TiO₃ Ceramic-Based MIM Capacitor for Energy Storage Application

Abstract

Metal-insulator-metal (MIM) capacitor with high-k insulator such as BST enhances specific capacitance. The effects of barium mole fraction (x) of Ba_xSr_{1 – x}TiO₃ ceramic-based MIM capacitor on specific capacitance and leakage current density are reported in this article. Ba_xSr_{1 – x}TiO₃ nanopowder for various x are synthesized using solid-state reaction method and the performance parameters of Ag/Ba_xSr_{1 – x}TiO₃/Ag MIM capacitors are evaluated. The mean crystallite sizes are in 20 to 60 nm range. Ba_0.7Sr_0.3 TiO₃ ceramics show higher relative permittivity owing to its higher mean crystallite size. The insulator with higher crystallite size at dominant orientation shows enhanced leakage performance. Ba_0.1 Sr_0.9 TiO₃ ceramic capacitor shows optimum performance altogether.

Keywords:

• Energy storage
• ceramic capacitor
• crystallite size
• specific capacitance
• leakage current

Acknowledgments

The authors are grateful to Dr. Surendran K.P. and his research team from CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala for help in making green pellets, sintering samples and capacitance measurements.