Nanoscale imaging of ferroelectric domain and resistance switching in hybrid improper ferroelectric Ca3Ti2O7 thin films

Shi, Yi; Wang, S.Y.; Ma, Shuang; Lei, Yunlin; Liu, H.L.; Chen, X.L.; Liu, W.F.

doi:10.1016/j.physleta.2020.126609

Cited by 7 publications

(3 citation statements)

References 35 publications

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“…The HIF of Ca 3 Ti 2 O 7 films originates from the interplay of trilinear-related lattice modes in layered oxides, and these interactions are directly strained tuneable [75]. The ferroelectric domain switching and ferroelectric resistance reverse behaviours of Ca 3 Ti 2 O 7 films were evaluated in a recent study, and the maximum resistive ratios reached ∼1750 [76]. These results indicate that HIF in Ca 3 Ti 2 O 7 films is a promising oxide employed in non-volatile memory and logic devices.…”

Section: Compoundsmentioning

confidence: 99%

Review of experimental progress of hybrid improper ferroelectricity in layered perovskite oxides

Zhang¹,

Liu²,

Chen³

2021

J. Phys. D: Appl. Phys.

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The primary order parameter of hybrid improper ferroelectricity (HIF) is not spontaneous polarisation but nonpolar modes such as oxygen octahedral rotations (OORs), antipolar, or even Jahn–Teller distortions; therefore, the HIF mechanism may be applied as an effective pathway to tune electronic bandgaps, control orbitals, and create multiferroicity. Most of the current experimental research on HIF is focused on layered perovskite oxides; therefore, this review focuses on the recent progress of experimental studies on HIF materials with the Ruddlesden–Popper (R–P) and Dion–Jacobson (D–J) structures. Experimental research on double-layered R–P oxides is included, and the linear relationship between the Curie temperature and tolerance factor has been established. Moreover, the coexistence of polar and weak ferromagnetic phases has been observed in iron-based double-layered R–P oxides at room temperature. The recent discovery of ferroelectricity in A-site cation-ordered triple-layered R–P oxides has significantly expanded the HIF field. HIF has also been confirmed in caesium- and rubidium-based double-layered D–J oxides, and complex OOR modes have been observed in D–J oxides. Although significant progress has been achieved for HIF materials in layered perovskite oxides, extensive research is required to reveal the mysteries of HIF and to create single-phase multiferroics in HIF materials.

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Section: Compoundsmentioning

confidence: 99%

Review of experimental progress of hybrid improper ferroelectricity in layered perovskite oxides

Zhang¹,

Liu²,

Chen³

2021

J. Phys. D: Appl. Phys.

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“…A recent experimental work on a polycrystalline Ca 3 Ti 2 O 7 sample reported a negative longitudinal piezoelectric strain coefficient d 33 = −45 pm/V . Negative longitudinal piezoelectricity, where polarization decreases under an applied stress is quite unusual and has only been reported in a few other materials. , However, another work on Ca 3 Ti 2 O 7 thin films measured a very small positive value d 33 = 5 pm/V . These piezoelectric coefficients are small compared to those of state-of-the-art piezoelectric perovskites such as PMN–PT, with d 33 values as high as 2500 pm/V reported .…”

Section: Introductionmentioning

confidence: 99%

“…20,21 However, another work on Ca 3 Ti 2 O 7 thin films measured a very small positive value d 33 = 5 pm/V. 22 These piezoelectric coefficients are small compared to those of state-of-the-art piezoelectric perovskites such as PMN−PT, with d 33 values as high as 2500 pm/V reported. 23 However, the presence of multiple lowenergy competing structural phases in n = 2 Ruddlesden− Popper layered perovskites together with the coupling between octahedral rotations and polarization, may enable interesting electromechanical effects in these materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Piezoelectricity in n = 2 Ruddlesden–Popper Ferroelectric Oxides

Hasin,

Pokhrel,

Nowadnick

2024

Chem. Mater.

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Our computed longitudinal piezoelectric coefficients are comparable to the intrinsic coefficients of prototypical perovskite ferroelectrics. We identify an unusual form of transverse piezoelectricity in Ca 3 Ti 2 O 7 and Li 2 SrNb 2 O 7 , where one transverse piezoelectric coefficient is negative and the other is positive. Furthermore, we show that octahedral rotation distortions, which are coupled to the polarization in this family of layered ferroelectrics, can tune the amplitudes of the piezoelectric coefficients.

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Probing Charge Carrier Properties and Ion Migration Dynamics of Indoor Halide Perovskite PV Devices Using Top‐ and Bottom‐Illumination SPM Studies

Alosaimi

Shin

Chin

et al. 2021

Advanced Energy Materials

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Recently, perovskite solar cells have shown excellent performance under indoor light conditions. In a new approach using directional illumination combined with nanoscale scanning probe microscopy (SPM) characterization, morphology dependent‐charge transport measurements are performed to provide a comprehensive understanding of the optoelectronic behavior of (FAPbI3)0.85(MAPbBr3)0.15 containing 5 vol% cesium (Cs5vol%) with various electron transport layers (ETLs), i.e., SnO2, c‐TiO2, and [6,6]‐phenyl‐C61‐butyric acid methyl ester/SnO2 under indoor light. This approach allows the identification of the charge transport properties of the perovskite film and the perovskite/ETL interface separately. The light is applied from the top of the perovskite film to study the electronic properties of the surface. Lower photocurrent and lower surface photovoltage (SPV) are observed under top‐illumination conditions. The electronic interface behavior is investigated using bottom‐illumination and short excitation wavelengths, such as blue LED light. Higher photocurrent and higher SPV are observed under blue light illumination from the bottom. These results suggest that the charge transport capability is enhanced near the p–n junction. Conductive atomic force microscopy results show that SnO2 enhances the charge collection properties of the perovskite's grain boundaries (GBs). Kelvin probe force microscopy results confirm that SnO2 exhibits homogeneous and high surface potential because of the lowest trap states at GBs.

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Nanoscale imaging of ferroelectric domain and resistance switching in hybrid improper ferroelectric Ca3Ti2O7 thin films

Cited by 7 publications

References 35 publications

Review of experimental progress of hybrid improper ferroelectricity in layered perovskite oxides

Review of experimental progress of hybrid improper ferroelectricity in layered perovskite oxides

Piezoelectricity in n = 2 Ruddlesden–Popper Ferroelectric Oxides

Probing Charge Carrier Properties and Ion Migration Dynamics of Indoor Halide Perovskite PV Devices Using Top‐ and Bottom‐Illumination SPM Studies

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