期刊
APPLIED SURFACE SCIENCE
卷 636, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2023.157851
关键词
Bismuth layer-structured ferroelectrics; Intergrowth structure; Dielectric capacitors; Energy storage; Si
In this study, Bi4Ti3O12-CaBi4Ti4O15 intergrowth ferroelectric films integrated on Si were shown to possess an ultrahigh recyclable energy density and good energy efficiency, achieved through the combination of high spontaneous polarization and a polycrystalline nanograin microstructure. The limited grain growth and buffer layer effect exhibited by this structure contributed to remarkable fatigue-resistance and excellent charge-retaining ability.
Bismuth layer-structured ferroelectrics (BLSFs) have shown a great design capability for electrical energy storage, due to a highly anisotropic lattice and dielectric property. In this work, we add another notch to their qualifications as high energy density dielectrics, by demonstrating an ultrahigh recyclable energy density (Wrec 151.1 J/cm3 @ 4 MV/cm) and a good energy efficiency (q 72.0%) in Bi4Ti3O12-CaBi4Ti4O15 intergrowth ferroelectric films integrated on Si. This performance was achieved by the combination of a high spontaneous polarization (Ps) of the intergrown superlattice, and a polycrystalline nanograin microstructure. The high Ps is obtained through design of a special lattice, which determines the up limit of the energy density. On the other hand, the nanograin structure corresponds to a reduce remnant polarization, an intermediate dielectric constant and a delayed polarization saturation, all are ideal features for achieving a high recyclable energy density and energy efficiency. Such a structure is the consequence of a limited grain growth under the effect of a buffer layer. Lastly, a remarkable fatigue-resistance and an excellent charge-retaining ability were exhibited by these lead-free BLSF films. We expect this work will pave the way for designing high performance bismuth layer-structured ferroelectric films targeted for dielectric energy storage applications.
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