High Energy Storage Performance in Ba_0.85Ca_0.15Zr_0.1Ti_0.9O₃‐ZnO Hybrid Perovskite Solid Solution Thin Films

Abstract

Relaxor property plays a key role in determining energy storage performance of dielectric capacitor. The usual method to improve relaxor property is to form substitutional solid solution. Here an unusually substitutional and interstitial hybrid perovskite solid solution 0.8(Ba0.85Ca0.15Zr0.1Ti0.9O3)‐0.2ZnO (BCZT:Zn) is designed, where one Zn2+ occupies B‐site and two Zn2+ share one A‐site of perovskite structure, and fabricated its epitaxial thin films. Compared to BCZT films, BCZT:Zn films have increased c/a ratio which leads to enhanced maximum polarization Pmax, wide band gap therefore high electrical breakdown strength EBDS, and enhanced relaxor degree thus suppressed remanent polarization Pr. As the results, dramatically improve energy storage property with the recoverable energy storage density Wrec of 75.9 J cm−3 and the energy storage efficiency η of 76.7% are obtained in BCZT:Zn films. This work not only provides a high performance relaxor ferroelectric material, but also impacts some new thinking to optimize die/ferro/piezoelectric properties by forming hybrid solid solutions.