Multilayer thin films with compositional PbZr0.52Ti0.48O3/Bi1.5Zn1.0Nb1.5O7 layers for tunable applications

Abstract

The dielectric properties and tunability of multilayer thin films with compositional PbZr0.52Ti0.48O3/Bi1.5Zn1.0Nb1.5O7 (PZT/BZN) layers (PPBLs) fabricated by pulsed laser deposition on Pt/TiO2/SiO2/Si substrate have been investigated. Dielectric measurements indicate that the PZT/BZN bilayer thin films exhibit medium dielectric constant of about 490, low loss tangent of 0.017, and superior tunable dielectric properties (tunability = 49.7% at 500 kV/cm) at a PZT/BZN thickness ratio of 3, while the largest figure of merit is obtained as 51.8. The thickness effect is discussed with a series connection model of bilayer capacitors, and the calculated dielectric constant and loss tangent are obtained. Furthermore, five kinds of thin–film samples comprising single bilayers, two, three, four and five PPBLs were also elaborated with the final same thickness. The four PPBLs show the largest dielectric constant of ~538 and tunability of 53.3% at a maximum applied bias field of 500 kV/cm and the lowest loss tangent of ~0.015, while the largest figure of merit is 65.6. The results indicate that four PPBLs are excellent candidates for applications of tunable devices.

Grain boundary driven Plateau–Rayleigh instability in multilayer nanocrystalline thin film: A phase-field study

“…They have been successfully applied as surface protection for tribological applications, diffusion barriers in microelectronics, hard wear resistant coatings on cutting tools due to their high hardness, fracture toughness, chemical inertness and thermal stability. [1,2,3,4]. Essentially, the designing of an appropriate microstructure is the key for desired thin film properties.…”

Ferroelectric composite artificially-structured functional material: multifield control for tunable functional devices

“…The tested relative permittivity of ferroelectric/ferroelectric heterostructure can be calculated from the model of series connected capacitances [194]. The theoretical relative permittivity (ε t ) and loss tangent (tan δ t ) of the heterostructure is expressed as [195]…”

Phase Transitions and Dynamics in Mixed Three- and Low-Dimensional Lead Halide Perovskites

“…In addition to the fundamental interest, the frustrated phases of classical inorganic compounds have a wide range of applications . For example, due to large value, slow variation with temperature, and low-loss dielectric permittivity, relaxors are used as dielectric media in ceramic capacitors and tunable microwave devices . Some solid solutions of relaxors with ferroelectrics also exhibit a very large electromechanical coupling and piezoelectric response making them widely applicable in piezoelectric devices in transducers and actuators .…”