3D architectures of single-crystalline complex oxides

Kim, Shin-Ik; Choi, Hyung-Jin; Lee, Gwangyeob; Roh, Chang Jae; Jung, Inki; Jung, Soo Young; Ning, Ruiguang; Won, Sung Ok; Chang, Hye Jung; Lee, Jong Seok; Kim, Seong Keun; J, Kim; Kang, Chong‐Yun; Choi, Ji‐Won; Baek, Seung Hyub

doi:10.1039/d0mh00292e

Cited by 10 publications

(7 citation statements)

References 42 publications

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“…The outof-plane parameter b of the film is aligned with the anatase [001] crystallographic orientation and was measured here to be 9.454 Å, in good agreement with the corresponding parameter of the anatase unit cell, which is due to the very low lattice mismatch between substrate and film (0.1%) [72]. This low mismatch is further confirmed by the value for the in-plane parameter a of the film, which has been found to be very close to the value for LaAlO 3 of 3.787 Å [62]. The excellent match between the two crystals in their present orientation is also reflected in the measured value for γ of almost exactly 90°.…”

Section: Anatase On Laalo 3 (100)supporting

confidence: 86%

“…The data was acquired with a Gatan CCD camera with a resolution of 1024 × 1024 pixel using the Gatan Microscopy Suite (GMS, v. 1.4). Spot positions of the SAED pattern were extracted using LEEDLab [57], scaling was carried out using a correction matrix determined from the reflexes associated with LaAlO 3 with the unit cell size taken from the literature [61,62].…”

Section: Methodsmentioning

confidence: 99%

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Automatic indexing of two-dimensional patterns in reciprocal space

et al. 2021

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An indispensable part of the structure determination of crystalline two-dimensional (2D) materials and epitaxial thin films is the correct indexing of the acquired diffraction patterns. In our previous work, we described an effective algorithm to determine the 3D unit-cell parameters of complex systems comprising different orientations and polymorphs. In this work, we adapt the indexing method to 2D lattices in reciprocal space. Analyzing low-energy electron diffraction and Fourier-transformed scanning tunneling microscopy measurements, the method is exemplarily applied to thin films of conjugated molecules like 3,4:9,10-perylenetetracarboxylic dianhydride (PTCDA), 6,13-pentacenequinone (P2O), and vanadyl phthalocyanine (VOPc) grown by physical vapor deposition on Ag(111). In all cases unit cells (rhomboids) along with their sixfold rotationally or mirror symmetric counterparts are determined. The already known commensurate epitaxial relationship is reproduced for PTCDA on Ag(111), demonstrating the validity of our method. In the case of P2O/Ag(111) a point-on-line epitaxial condition is found. Our algorithm can be equally well applied to all kinds of 2D patterns in reciprocal space where a crystallographic indexing is required, e.g., electron diffraction data [such as transmission electron diffraction, selected area electron diffraction (SAED)] and fast Fourier transforms (FFTs) of scanning probe images. To demonstrate this aspect, we evaluate FFTs of scanning tunneling microscopy data for stacked VOPc/PTCDA heteroepitaxial layers on Ag(111) as well as SAED data of an epitaxial TiO 2 /LaAlO 3 (100) heterostructure in cross section.

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Section: Anatase On Laalo 3 (100)supporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Automatic indexing of two-dimensional patterns in reciprocal space

et al. 2021

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“…To develop freestanding form of LAO/STO, careful consideration of lattice symmetry, growth thermodynamics, and etchant selectivity for the sacrificial layer and membrane material is required. Our approach to releasing LAO/STO from its oxide substrate here is to insert a sacrificial SrRuO 3 (SRO) layer between pulsed laser deposition (PLD)–grown LAO/STO film and oxide substrates ( 28 ). Since the heterointerface property of LAO/STO highly depends on the quality of STO, synthesizing high-quality STO/SRO templates is crucial for this study.…”

Section: Resultsmentioning

confidence: 99%

Electronically reconfigurable complex oxide heterostructure freestanding membranes

Eom

Seo

et al. 2021

Sci. Adv.

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In recent years, lanthanum aluminate/strontium titanate (LAO/STO) heterointerfaces have been used to create a growing family of nanoelectronic devices based on nanoscale control of LAO/STO metal-to-insulator transition. The properties of these devices are wide-ranging, but they are restricted by nature of the underlying thick STO substrate. Here, single-crystal freestanding membranes based on LAO/STO heterostructures were fabricated, which can be directly integrated with other materials via van der Waals stacking. The key properties of LAO/STO are preserved when LAO/STO membranes are formed. Conductive atomic force microscope lithography is shown to successfully create reversible patterns of nanoscale conducting regions, which survive to millikelvin temperatures. The ability to form reconfigurable conducting nanostructures on LAO/STO membranes opens opportunities to integrate a variety of nanoelectronics with silicon-based architectures and flexible, magnetic, or superconducting materials.

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“…Limitations in the choice of available substrates further restrict the degree of strain engineering. Additionally, the substrate clamping effect makes the creation of 3D architectures of such functional materials less feasible, − raising the question of how to overcome these limitations. One way to address these limitations is by separating the film from the substrate.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Molecular Beam Epitaxy for Single-Crystalline Oxide Membranes with Binary Oxide Sacrificial Layers

Varshney,

Choo,

Thompson

et al. 2024

ACS Nano

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The advancement in thin-film exfoliation for synthesizing oxide membranes has led to possibilities for creating artificially assembled heterostructures with structurally and chemically incompatible materials. The sacrificial layer method is a promising approach to exfoliate as-grown films from a compatible material system, allowing for their integration with dissimilar materials. Nonetheless, the conventional sacrificial layers often possess an intricate stoichiometry, thereby constraining their practicality and adaptability, particularly when considering techniques such as molecular beam epitaxy (MBE). This is where easy-to-grow binary alkalineearth-metal oxides with a rock salt crystal structure are useful. These oxides, which include (Mg, Ca, Sr, Ba)O, can be used as a sacrificial layer covering a much broader range of lattice parameters compared to conventional sacrificial layers and are easily dissolvable in deionized water. In this study, we show the epitaxial growth of the single-crystalline perovskite SrTiO 3 (STO) on sacrificial layers consisting of crystalline SrO, BaO, and Ba 1−x Ca x O films, employing a hybrid MBE method. Our results highlight the rapid (≤5 min) dissolution of the sacrificial layer when immersed in deionized water, facilitating the fabrication of millimeter-sized STO membranes. Using high-resolution Xray diffraction, atomic-force microscopy, scanning transmission electron microscopy, impedance spectroscopy, and scatteringtype near-field optical microscopy (SNOM), we demonstrate single-crystalline STO membranes with bulk-like intrinsic dielectric properties. The employment of alkaline earth metal oxides as sacrificial layers is likely to simplify membrane synthesis, particularly with MBE, thus expanding the research and application possibilities.

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3D architectures of single-crystalline complex oxides

Abstract: We proposed 3D architectures of complex oxides as a way to derive novel properties: various 3D shapes were formed by self-shaped free-standing membranes, and curvature-induced polarization in an otherwise nonpolar material was observed.

Cited by 10 publications

References 42 publications

Automatic indexing of two-dimensional patterns in reciprocal space

Automatic indexing of two-dimensional patterns in reciprocal space

Electronically reconfigurable complex oxide heterostructure freestanding membranes

Hybrid Molecular Beam Epitaxy for Single-Crystalline Oxide Membranes with Binary Oxide Sacrificial Layers

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