Switching properties of epitaxial La0.5Sr0.5CoO3/Na0.5Bi0.5TiO3/La0.5Sr0.5CoO3 ferroelectric capacitor

Song, Jian; Luo, Laihuo; Dai, Xiu; Song, Aizhen; Zhou, Yang; Li, Z. N.; Liang, Jin-e; Liu, B. T.

doi:10.1039/c7ra12575e

Cited by 10 publications

(5 citation statements)

References 29 publications

(28 reference statements)

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“…However, the ΔP reduced to 13.5 μC/cm 2 from 16.5 μC/cm 2 after 10 10 switching cycles for the Pt top electrode. These results indicate that the LSCO bottom electrode is good for fatigue resistance and the Pt top electrode would cause decreased ΔP due to the reaction of Pt and O from NBT film [18,19]. The inset of Figure 4a presents the P-E loops before and after 10 10 switching cycles, in which a decreased P-E loop was observed.…”

Section: Resultsmentioning

confidence: 83%

“…However, the noble metals as bottom electrodes react easily with oxygen derived from the oxide films and deteriorate the performance of the oxide films [17]. Compared to Pt, Au and Ag, the La 0.5 Sr 0.5 CoO 3 (LSCO) is low in cost and can provide an oxide/oxide (LSCO/NBT) interface that will not capture the oxygen from the oxide films [18,19]. In this work, Pt/NBT/LSCO ferroelectric capacitors were fabricated on (110)-oriented STO substrate by magnetron sputtering and pulsed laser deposition with LSCO as the bottom electrode.…”

Section: Introductionmentioning

confidence: 99%

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Structure and Electrical Properties of Na0.5Bi0.5TiO3 Epitaxial Films with (110) Orientation

et al. 2019

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Pt/Na 0.5 Bi 0.5 TiO 3 /La 0.5 Sr 0.5 CoO 3 (Pt/NBT/LSCO) ferroelectric capacitors were fabricated on (110) SrTiO 3 substrate. Both NBT and LSCO films were epitaxially grown on the (110) SrTiO 3 substrate. It was found that the leakage current density of the Pt/NBT/LSCO capacitor is favorable to ohmic conduction behavior when the applied electric fields are lower than 60 kV/cm, and bulk-limited space charge-limited conduction takes place when the applied electric fields are higher than 60 kV/cm. The Pt/NBT/LSCO capacitor possesses good fatigue resistance and retention, as well as ferroelectric properties with P r = 35 µC/cm 2 . The ferroelectric properties of the Pt/NBT/LSCO capacitor can be modulated by ultraviolet light. The effective polarization, ∆P, was reduced and the maximum polarization P max was increased for the Pt/NBT/LSCO capacitor when under ultraviolet light, which can be attributed to the increased leakage current density and non-reversible polarization Pˆcaused by the photo-generated carriers.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Structure and Electrical Properties of Na0.5Bi0.5TiO3 Epitaxial Films with (110) Orientation

et al. 2019

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“…The resulting piezoelectric loop is therefore not symmetric (figure 2(d)) as often reported for many piezoelectric samples [56][57][58][59][60]. From the comparison between deformation measurements and PV responses it is evident that a tension along the polarization direction (state 1, obtained after positive poling) is more favourable for PV effect, in contrast to compression (state 16).…”

Section: Electrically-induced Remanent Strain For Positive and Negati...mentioning

confidence: 74%

“…This asymmetry can be further increased by the asymmetry in coercive electric fields after positive and negative poling known as internal bias field (figure 2(c) (inset)). As a result, the measured deformation along the poled direction exhibits remanent tension The resulting piezoelectric loop is therefore not symmetric (figure 2(d)) as often reported for many piezoelectric samples [56][57][58][59][60]. From the comparison between deformation measurements and PV responses it is evident that a tension along the polarization direction (state 1, obtained after positive poling) is more favourable for PV effect, in contrast to compression (state 16).…”

Section: Electrically-induced Remanent Strain For Positive and Negati...mentioning

confidence: 78%

On the photovoltaic effect asymmetry in ferroelectrics

Semak¹,

Kapustianyk²,

Eliyashevskyy³

et al. 2022

J. Phys.: Condens. Matter

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Despite symmetrical polarization, the magnitude of a light-induced voltage is known to be asymmetric with respect to poling sign in many photovoltaic (PV) ferroelectrics (FEs). This asymmetry remains unclear and is often attributed to extrinsic effects. We show here for the first time that such an asymmetry can be intrinsic, steaming from the superposition of asymmetries of internal FE bias and electro-piezo-strictive deformation. This hypothesis is confirmed by the observed decrease of PV asymmetry for smaller FE bias. Moreover, the both PV effect and remanent polarization are found to increase under vacuum-induced expansion and to decrease for gas-induced compression, with tens percents tunability. The change in cations positions under pressure is analysed through the first-principle density functional theory calculations. The reported properties provide key insight for FE-based solar elements optimization.

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“…By chemical methods, stoichiometric BNT films were formed by adding only Bi in excess (3‐10%), 15,16 or both Na and Bi in excess where the introduced quantity can vary from 5% to 25% for Na and 5% to 10% for Bi 17‐19 . In PLD and sputtering processes, stoichiometric targets were used 11,20 or Na and/or Bi excess were introduced but with a large range of variation according to the different works 9,10,21–23 . These methods show how much the synthesis of stoichiometric BNT thin films of BNT is difficult, empirical and technical dependant.…”

Section: Introductionmentioning

confidence: 99%

Composition control of lead‐free piezoelectric BNT thin ceramic films deposited by ex situ sputtering

2021

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(Bi0.5Na0.5)TiO3 thin film growth by ex situ sputtering has been investigated and reported in this paper. An original approach, based on the growth process, was used in order to precisely control the film composition, which has never been reported in BNT growth. The bismuth content in the films and so the composition of amorphous sputtered films was controlled by a slight heating of the substrate during the growth (150–240°C). Then, films were crystallized, obviously without any change in composition, by a post‐annealing treatment. More precisely, without substrate heating and using a stoichiometric target, the film presents an excess of Bi but when it is deposited at 200°C the film becomes stoichiometric. It was shown that the sticking coefficient of Bi is particularly sensitive even at low substrate temperatures, whereas Na and Ti sticking coefficients are not impacted. Followed by a post‐annealing in air at 650°C, the composition of the amorphous BNT films deposited at 200°C remains stoichiometric and the film exhibits a high (100) preferred orientation in a pure perovskite phase and a dense microstructure. The evaluation of the electrical properties as a function of the Bi content in the film, adjusted by the deposition temperature, shows a strong impact on the ferroelectric properties where the best performances were obtained with the stoichiometric BNT film deposited at 200°C.

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Switching properties of epitaxial La_0.5Sr_0.5CoO₃/Na_0.5Bi_0.5TiO₃/La_0.5Sr_0.5CoO₃ ferroelectric capacitor

Abstract: La0.5Sr0.5CoO3/Na0.5Bi0.5TiO3/La0.5Sr0.5CoO3 (LSCO/NBT/LSCO) ferroelectric capacitors have been successfully fabricated on (001) SrTiO3 substrate, in which the LSCO film is prepared by magnetron sputtering and the NBT film by pulsed laser deposition.

Cited by 10 publications

References 29 publications

Structure and Electrical Properties of Na0.5Bi0.5TiO3 Epitaxial Films with (110) Orientation

Structure and Electrical Properties of Na0.5Bi0.5TiO3 Epitaxial Films with (110) Orientation

On the photovoltaic effect asymmetry in ferroelectrics

Composition control of lead‐free piezoelectric BNT thin ceramic films deposited by ex situ sputtering

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