High-efficiency dielectric capacitors based on BaTi0.5Hf0.503 films
Film dielectric capacitors enabled with large breakdown field strength and high energy density play a key role for compact and integrated power systems.Nevertheless,the energy storage efficiency is always sacrificed as we tried to increase the energy density.This trade-off between energy density and efficiency means significant energy dissipation and thermal effects,which will lead to a deterioration of the reliability and lifetime of the dielectric capacitors.In the present work,we design a crystalline-amorphous structure based on BaTi0.5Hf0.5O3 films,in which the nano-sized crystalline BaTi0.5Hf0.5O3 matrix contributes to a relatively large polarization,while the amorphous phase is beneficial to the enhanced breakdown field strength and lowered polarization-electric field hysteresis.Thus,such structure simultaneously leads to a high energy storage efficiency of 90.6%and a relatively high energy density of 53 J·cm-3,as well as excellent antifatigue properties.This work provides a feasible route to realize outstanding energy storage performance in dielectric capacitors.
based、bati0.5hf0.503、capacitors、dielectric、films、high-efficiency
42
2023-10-09(万方平台首次上网日期,不代表论文的发表时间)
共7页
2545-2551