New strain states and radical property tuning of metal oxides using a nanocomposite thin film approach

MacManus‐Driscoll, Judith L.; Suwardi, Ady; Kuršumović, A.; Bi, Zhenxing; Tsai, Chen Fong; Wang, Haiyan; Jia, Q. X.; Lee, Oon Jew

doi:10.1063/1.4919059

Cited by 38 publications

(59 citation statements)

References 19 publications

(24 reference statements)

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“…A broad range of researchers utilize the so-called domain matching epitaxy (DME) to synthesize large lattice mismatch systems, wherein the epitaxial growth of thin films is achieved by matching the domains with integral multiples of major lattice planes matching across the interface. [64][65][66][67][68] This growth technique is one way of achieving semi-coherent interfaces as it can be applied to systems having mismatch larger than 7%. Experimental evidence of misfit dislocations at various oxide heterointerfaces is provided in Figure 2.…”

Section: Semi-coherent Complex Oxide Heterostructures and Misfit Dislmentioning

confidence: 99%

Beyond Coherent Oxide Heterostructures: Atomic‐Scale Structure of Misfit Dislocations

Dholabhai

Uberuaga

2019

Advcd Theory and Sims

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Nanoscale design of complex oxide heterostructures and thin films is imperative as they have significant promise in novel technological applications. A coherent interface is formed in oxide heterostructures with small mismatches, and the lattice mismatch is completely compensated by elastic strain. In semi-coherent oxide heterostructures, when an epitaxial layer is grown on the substrate above the critical thickness of the film, misfit dislocations are formed to mitigate the strain between the two materials with dissimilar lattice constants. Key properties of semi-coherent oxide heterostructures are influenced or even controlled by the presence of misfit dislocations. Therefore, it is critical to understand the atomic-scale structure of semi-coherent oxide heterostructures, specifically the structure of misfit dislocations that are ubiquitous at such heterointerfaces. Numerous state-of-the-art experiments have reported emergent phenomena at semi-coherent oxide heterostructures, wherein misfit dislocations play a crucial role. However, their atomic-scale and nanoscale structure is not always discernable from experiments. Due to large system sizes, computational studies dedicated to examining misfit dislocations in semi-coherent oxide heterostructures are still in their infancy. This review aims to summarize the recent advancements and challenges involved in computational studies elucidating the atomic-scale structure of misfit dislocations in semi-coherent oxide heterostructures and motivate future computational efforts.

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Section: Semi-coherent Complex Oxide Heterostructures and Misfit Dislmentioning

confidence: 99%

Beyond Coherent Oxide Heterostructures: Atomic‐Scale Structure of Misfit Dislocations

Dholabhai

Uberuaga

2019

Advcd Theory and Sims

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“…[54][55][56] While the growth of laterally aligned heteroepitaxy films is complicated and slow due to the need for layer-by-layer growth and perfection of each layer to maintain good heteroepitaxy, VAN films can be grown in a short time since one ablation of the target releases both species simultaneously. Furthermore, epitaxy does not degrade with thickness because vertical epitaxy dominates the growth, 61,63,[72][73][74] independent of the substrate. This permits entirely new strain states to be realized with elastic constants and thermal expansion constants of the phases playing strong roles.…”

Section: Growth Mechanisms Of Van Filmsmentioning

confidence: 99%

“…86,87 On the other hand, in VAN films comprising ionically conducting SDC nanopillars, the crystallinity of the SDC phase is much enhanced. 50,56 The reason for the enhanced crystallinity in VAN films is related to the large area vertical heteroepitaxy along many interfaces, 73 contrasting with the single interface formed in a planar film. Full understanding of the uniform strain and defect reduction requires further basic studies.…”

Section: B Improved Crystallinity Of Ionic Conductorsmentioning

confidence: 99%

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Lee

MacManus‐Driscoll

2017

APL Materials

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This review provides the design principles to develop new nanoionic applications using vertically aligned nanostructured (VAN) thin films, incorporating two phases which self-assemble in one film. Tunable nanoionics has attracted great attention for energy and device applications, such as ion batteries, solid oxide fuel cells, catalysts, memories, and neuromorphic devices. Among many proposed device architectures, VAN films have strong potential for nanoionic applications since they show enhanced ionic conductivity and tunability. Here, we will review the recent progress on state-of-the-art nanoionic applications, which have been realized by using VAN films. In many VAN systems made by the inclusion of an oxygen ionic insulator, it is found that ions flow through the vertical heterointerfaces. The observation is consistent with structural incompatibility at the vertical heteroepitaxial interfaces resulting in oxygen deficiency in one of the phases and hence to oxygen ion conducting pathways. In other VAN systems where one of the phases is an ionic conductor, ions flow much faster within the ionic conducting phase than within the corresponding plain film. The improved ionic conduction coincides with much improved crystallinity in the ionically conducting nanocolumnar phase, induced by use of the VAN structure. Furthermore, for both cases Joule heating effects induced by localized ionic current flow also play a role for enhanced ionic conductivity. Nanocolumn stoichiometry and strain are other important parameters for tuning ionic conductivity in VAN films. Finally, double-layered VAN film architectures are discussed from the perspective of stabilizing VAN structures which would be less stable and hence less perfect when grown on standard substrates.

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“…A paradigm shift in ferroelectrics toward miniaturization has come about because of the considerable interest in low energy consumption and nonvolatile nanoelectronics. The advances in the fabrication of ferroelectric structures in the nanometer range have brought to life new physical phenomena and encouraged unique combinations of functionalities . Ba 0.6 Sr 0.4 TiO 3 (BSTO) is a ferroelectric of topical interest, since it exhibits a wide variety of functional properties, including switchable polarization, piezoresponse, electro‐optical behavior, tunability, and nonlinear dielectric behavior.…”

Section: Introductionmentioning

confidence: 99%

“…A key reason for this is that the interfaces of the ferroelectric nanostructures in the films are epitaxially coupled to a second scaffold phase in the film. In such films, there is strong vertical strain that causes a strong enhancement of Curie temperature, enhanced dielectric tunability, reduced dielectric loss and leakage current, and, finally, enhanced saturation polarization . On the other hand, in these promising nanocomposite ferroelectrics neither the extent of polarization nor the polarization retention has been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

Giant Enhancement of Polarization and Strong Improvement of Retention in Epitaxial Ba_0.6Sr_0.4TiO₃‐Based Nanocomposites

Lee

Kuršumović

et al. 2017

Adv Materials Inter

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In Ba0.6Sr0.4TiO3 (BSTO)‐based epitaxial nanocomposite films increased P r values are demonstrated by up to a factor of 3 compared to standard BSTO films. A strongly reduced temperature coefficient of polarization retention is also obtained, i.e., 0.07% °C−1 compared to 0.24% °C−1. Piezopoling with only marginal leakage current is also achieved up to 200 °C, the highest temperature studied. The origin of the improved performance is the incorporation of Sm2O3 nanopillars in the films which acted as stiff vertical nanoscaffolds, inducing a strong tetragonal distortion in the BSTO (up to 1.033(7) in terms of the out‐of‐plane/in‐plane lattice dimensions). The films have comparable performance to industry‐standard Pb(Zr,Ti)O3 films, at the same time as being Pb‐free.

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New strain states and radical property tuning of metal oxides using a nanocomposite thin film approach

Cited by 38 publications

References 19 publications

Beyond Coherent Oxide Heterostructures: Atomic‐Scale Structure of Misfit Dislocations

Beyond Coherent Oxide Heterostructures: Atomic‐Scale Structure of Misfit Dislocations

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Giant Enhancement of Polarization and Strong Improvement of Retention in Epitaxial Ba_0.6Sr_0.4TiO₃‐Based Nanocomposites

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New strain states and radical property tuning of metal oxides using a nanocomposite thin film approach

Cited by 38 publications

References 19 publications

Beyond Coherent Oxide Heterostructures: Atomic‐Scale Structure of Misfit Dislocations

Beyond Coherent Oxide Heterostructures: Atomic‐Scale Structure of Misfit Dislocations

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Giant Enhancement of Polarization and Strong Improvement of Retention in Epitaxial Ba0.6Sr0.4TiO3‐Based Nanocomposites

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Giant Enhancement of Polarization and Strong Improvement of Retention in Epitaxial Ba_0.6Sr_0.4TiO₃‐Based Nanocomposites