Energy Storage Characteristics of BiFeO3/BaTiO3 Bi-Layers Integrated on Si

Abstract

BiFeO3/BaTiO3 bi-layer thick films (~1 μm) were deposited on Pt/Ti/SiO2/(100) Si substrates with LaNiO3 buffer layers at 500 °C via a rf magnetron sputtering process. X-ray diffraction (XRD) analysis revealed that both BiFeO3 and BaTiO3 layers have a (00l) preferred orientation. The films showed a small remnant polarization (Pr ~ 7.8 μC/cm2) and a large saturated polarization (Ps ~ 65 μC/cm2), resulting in a slim polarization-electric field (P-E) hysteresis loop with improved energy storage characteristics (Wc = 71 J/cm3, η = 61%). The successful “slim-down” of the P-E loop from that of the pure BiFeO3 film can be attributed to the competing effects of space charges and the interlayer charge coupling on charge transport of the bi-layer film. The accompanying electrical properties of the bi-layer films were measured and the results confirmed their good quality.

Straddled Band Aligned CuO/BaTiO3 Heterostructures: Role of Energetics at Nanointerface in Improving Photocatalytic and CO2 Sensing Performance

“…Electron affinity (qχ) values of CuO and BaTiO 3 are taken to be 5.3 and 4 eV, respectively . Work function (qΦ) values of CuO and BaTiO 3 were found to be 4.07 and 4.3 eV, respectively. , Briefly, during the continuous sensing tests carried out over an extended period, in air atmosphere, Ag particles tend to get oxidized, thus forming Ag + /Ag° redox couple with 5.3 eV electronic potential below the vacuum level . To attain electronic equilibrium with Ag, energy bands of CuO, BaTiO 3 or CuO/BaTiO 3 will bend and Fermi level ( E F ) will try to align at the redox potential of Ag + /Ag°, producing space charge region in the process .…”

Fluorite-Structured Ferroelectric-/Antiferroelectric-Based Electrostatic Nanocapacitors for Energy Storage Applications

“…PE films (e.g., SrTiO 3 ), which grow on the La 0.67 Sr 0.33 MnO 2 electrode, exhibited a high breakdown field (6.8 MV cm –1 ) as well as ultrahigh ESD (307 J cm –3 ) . Typical perovskite FE films (e.g., BaTiO 3 , − BiFeO 3 , , PbTiO 3 , and Pb­(Zr,Ti)­O 3 ,, ) have not been studied extensively due to low ESD. However, the solid solutions of these perovskite ceramics have been extensively studied for energy storage properties.…”

Flexible Lead-Free Ba0.5Sr0.5TiO3/0.4BiFeO3-0.6SrTiO3 Dielectric Film Capacitor with High Energy Storage Performance

“…At present, advanced energy storage techniques include batteries, superconducting magnetic energy storage systems and electrochemical/dielectric capacitors [5,6]. Among them, dielectric capacitors are attracting immense research interest in pulsed power systems due to their unique features of high-power density (up to 10 8 W kg −1 ) and short charge−discharge time (10 −3 -10 −6 s) [7][8][9][10][11][12].…”