Research progress of double perovskite ferroelectric thin films

Abstract

Double perovskite ferroelectric thin films are completely new material systems derived from single perovskite. Their diversity of composition and structure and the tendency for spontaneous atomic ordering broaden the path for the development of ferroelectric thin films. The ordered double perovskite ferroelectric thin films lead to excellent ferroelectric, dielectric, magnetic, and optical properties, promising further applications in photovoltaic cells, information memory, and spintronic and photoelectric devices, where the intrinsic coupling and tuning of multiple properties could also push it into multifunctional intersecting devices. However, complex internal physical mechanisms and difficult preparation conditions have prevented its further development. Based on ordered/disordered ferroelectric thin films of double perovskites, this paper first discusses ordered characterization methods such as superstructure reflection/diffraction peaks, especially for epitaxial thin films, saturation magnetization (macroscopic), and scanning transmission electron microscopy (microscopic). In response to the generally poor ordering of present systems, the paper also reviews the internal structure of the material and the external synthesis conditions that affect the ordering, including the valence and radii of the cations, preparation methods, element substitution and strain engineering, in the hope of triggering further research into ordered double perovskite ferroelectrics. Combined with the current state of research on existing double perovskite ferroelectricity thin film systems, advances in the fields of ferroelectric photovoltaics, magnetoelectric coupling, dielectric tunability, resistive switching, and photoelectric coupling have been presented. Finally, the challenges facing the material system are discussed and an outlook is provided for the development of the field.

Colossal Ferroelectric Photovoltaic Effect in Inequivalent Double-Perovskite Bi2FeMnO6 Thin Films

“…Since Nechache et al proposed tuning the optical E g by the ordering of B-site transition metal (TM) ions in the thin film and achieved a conversion efficiency of 8.1% (under AM 1.5G illumination) in 2015, the great potential of double perovskite (DP) ferroelectric thin films in ferroelectric PV has been gradually recognized. , It is well-known that the E g of perovskite ferroelectrics depends on the electronegativity and hybridization between B-site TM ions and oxygen ions. With easily transformable chemical compositions and valence states, spontaneous ordering, and tunability, DPs are expected to play an irreplaceable role in improving and enhancing the optical absorption of ferroelectric thin films .…”

Enhanced Tunable Properties of Strontium Barium Niobate Films on Dielectric Alumina Substrate at Microwaves

“…Ferroelectrics (FE) are characterized by a strong dependence of the dielectric permittivity on the external electric field, which makes them potential candidates for use in tunable microwave devices. Capacitors, delay lines, filters, and phase shifters can be realized on the basis of ferroelectric materials [1][2][3]. To implement FE microwave devices, a functional material is needed, which simultaneously exhibits high dielectric nonlinearity and a low level of losses at microwaves.…”

Phase Separation in the Double Perovskite Sr2FeNbO6-δ

“…The halide double perovskite with structural flexibility, as well as lower toxicity and higher stability, attracted the attention of the scientific community and stimulated the research on halide double perovskites with a lead-free A 2 B(I)B(III)X 6 composition [2]. The problems arising in the design and synthesis of double perovskites and possible ways to overcome them are discussed in [3]. Promising applications of double perovskites for the development of high-performance photodetectors are considered in [4].…”