4-inch Ternary BiFeO₃–BaTiO₃–SrTiO₃ Thin Film Capacitor with High Energy Storage Performance

Abstract

BiFeO3–BaTiO3 is a promising base for developing high energy density capacitors. However, no reports have been available on fabrication of binary or even ternary BiFeO3–BaTiO3 based solid solution films via a chemical solution route since Ba2+ and Bi3+ are incompatible. Here, we developed a chemical route via alternative coating layers of relaxor ferroelectric 0.4BiFeO3-0.6SrTiO3 and paraelectric Ba0.5Sr0.5TiO3 to realize a BiFeO3–BaTiO3–SrTiO3 film with the assistance of element interface diffusion. A remarkably improved energy density of 98 J cm–3 and a high efficiency of 80% are obtained in the film with optimized layer thickness because of its large dielectric constant, high breakdown strength, and strong relaxor behavior. Of particular interest, the fabrication technique allows deposition of film over an entire 4-in. silicon wafer with good uniformity and comparable energy-storage performance. The strategy can be applicable for fabrication of large-area dielectric or other films with incompatible elements in their precursor solution.

Superior energy storage performance in (Bi0.5Na0.5)TiO3-based lead-free relaxor ferroelectrics for dielectric capacitor application via multiscale optimization design

“…4(b)). The smaller leakage current density will generate fewer charged carriers, 12,99 which contributes to a higher E b . Fig.…”

High Energy Storage Performance and Large Electrocaloric Response in Bi0.5Na0.5TiO3–Ba(Zr0.2Ti0.8)O3 Thin Films

“…High breakdown electric field strength is associated with superior energy storage performance. The E b values of the (1 – x )BNT– x BZT ( x = 0.3–0.9) capacitors were evaluated using the following formulas: , X i = ln ( E i ) Y i = ln ( − ln true( 1 − i n + 1 true) ) where i , E i , and n are the serial number of the data sets, breakdown electric field strength, and total number of data sets, respectively. Figure f shows the Weibull distributions of the dielectric breakdown strengths for the (1 – x )BNT– x BZT ( x = 0.3–0.9) capacitors.…”

“…42 High breakdown electric field strength is associated with superior energy storage performance. The E b values of the (1 − x)BNT−xBZT (x = 0.3−0.9) capacitors were evaluated using the following formulas: 4,43 = X E ln( )…”

“…The energy crisis and living environment are worsening due to excessive consumption of nonrenewable resources and wanton destruction of the environment. − To alleviate these issues, it is imperative to strengthen energy utilization and reduce environmental pollution. Efficient storage of harvested energy and its conversion into electrical energy are critical but challenging.…”

Novel inorganic fillers of 1D hydroxyapatite nanowires induced superior energy storage performances of P(VDF–HFP)-based composite films

“…[1][2][3][4] Nonetheless, compared with the most commonly used energy storage devices, the low energy density of dielectric capacitors ($10 −2 to 10 −1 W h kg −1 vs. $10 W h kg −1 for supercapacitor and $150-250 W h kg −1 for batteries) severely limits their further development in electronic and power systems. 3,5,6 For instance, the energy density of the most widely used polymer dielectric capacitor, biaxially oriented polypropylene (BOPP), is limited to less than 2 J cm −3 . 7,8 Consequently, increasing the discharge energy density (U d ) of dielectric capacitors is an urgent task.…”