Sn-modified BaTiO3 thin film with enhanced polarization

Nunn, William; Kumar, Abinash; Zu, Rui; Nebgen, Bailey; Song, Yu; Manjeshwar, Anusha Kamath; Gopalan, Venkatraman; LeBeau, James M.; James, Richard D.; Jalan, Bharat

doi:10.1116/6.0002208

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…exhibit higher dielectric constants (k > 100) and greater stabilization of charge separation. [8,9] These perovskite-based films are traditionally fabricated via time-and cost-intensive deposition methods such as molecular beam epitaxy to ensure appropriate film crystallinity and stoichiometry. Alternatively, nanolaminate films consisting of alternating amorphous, sub-nanometer titania and alumina layers have been fabricated via atomic layer deposition or pulsed layer deposition, resulting in composite films with dielectric constants of 100 to 1,000, [10,11,12] that have been extensively evaluated.…”

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confidence: 99%

Alumina-Titania Nanolaminate Condensers for Hot Programmable Catalysis

Oh,

Walton,

Chalmers

et al. 2024

Preprint

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For programmable catalysis applications, nanolaminates composed of thin alternating layers of alumina and titania (ATO) were engineered using atomic layer deposition (ALD) as the dielectric material for a Pt-on-carbon catalytic condenser. Systematic investigation assessed synthesis parameters such as deposition temperature, alumina and titania layer thicknesses, the total number of layers (and interfaces), and the presence of a capping alumina layer on the maximum achievable charge accumulation in the Pt catalyst layer. The highest capacitance ATO configuration demonstrated a specific capacitance of ~1,200 nF/cm2 with working voltages of ±5 V, enabling the storage of 4×10^13 electrons or holes per cm2 at room temperature. Adsorption of carbon monoxide on the Pt/C-ATO device characterized by grazing incidence infrared spectroscopy showed changes in the surface binding energy of 13.1 ± 0.8 kJ/mol for an applied external voltage bias of ±1 V. The results enhance our understanding of nanolaminate structures and provide a method for increasing charge condensation strength for higher temperature surface chemistries.

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confidence: 99%

Alumina-Titania Nanolaminate Condensers for Hot Programmable Catalysis

Oh,

Walton,

Chalmers

et al. 2024

Preprint

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“…High- k dielectric films with high capacitance (>1000 nF cm –2 ) and thermal stability up to 400 °C would broaden the applicability of catalytic condensers to important reactions such as methanol and ammonia synthesis. Ferroelectric perovskite films such as lead titanate (PbTiO 3 ) and either strontium or barium titanate (BaTiO 3 or SrTiO 3 ) exhibit higher dielectric constants ( k > 100) and greater stabilization of charge separation. , These perovskite-based films are traditionally fabricated via time- and cost-intensive deposition methods, such as molecular beam epitaxy, to ensure appropriate film crystallinity and stoichiometry. Alternatively, nanolaminate films consisting of alternating amorphous, subnanometer titania and alumina layers have been fabricated via atomic layer deposition (ALD) or pulsed layer deposition, resulting in composite films with dielectric constants of 100 to 1000 − that have been extensively evaluated. − …”

mentioning

confidence: 99%

Alumina–Titania Nanolaminate Condensers for Hot Programmable Catalysis

Oh,

Walton,

Chalmers

et al. 2024

ACS Materials Lett.

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Nanolaminates composed of thin alternating layers of Al 2 O 3 and TiO 2 (ATO) were engineered by using atomic layer deposition as the dielectric material for a Pt-oncarbon catalytic condenser. Investigation assessed synthesis parameters including the deposition temperature, Al 2 O 3 and TiO 2 layer thicknesses, total number of layers, and a capping Al 2 O 3 layer on the maximum charge accumulation in the Pt catalyst. The highest capacitance ATO configuration demonstrated a specific capacitance of ∼1200 nF/cm 2 with working voltages of ±5 V, enabling the storage of 4 × 10 13 electrons or holes per cm 2 at room temperature. The ATO devices exhibited enhanced capacitance at elevated temperatures of up to 400 °C, suggesting the suitability of these materials for high-temperature applications. Adsorption of carbon monoxide on the Pt/C-ATO device characterized by grazing incidence infrared spectroscopy showed changes in the surface binding energy of 13.1 ± 0.8 kJ/mol for an applied external voltage bias of ±1 V.

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Optical second harmonic generation in anisotropic multilayers with complete multireflection of linear and nonlinear waves using ♯SHAARP.ml package

Zu,

Wang,

et al. 2024

npj Comput Mater

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Optical second harmonic generation (SHG) is a nonlinear optical effect widely used for nonlinear optical microscopy and laser frequency conversion. Closed-form analytical solution of the nonlinear optical responses is essential for evaluating materials whose optical properties are unknown a priori. A recent open-source code, ♯SHAARP.si, can provide such closed form solutions for crystals with arbitrary symmetries, orientations, and anisotropic properties at a single interface. However, optical components are often in the form of slabs, thin films on substrates, and multilayer heterostructures with multiple reflections of both the fundamental and up to ten different SHG waves at each interface, adding significant complexity. Many approximations have therefore been employed in the existing analytical approaches, such as slowly varying approximation, weak reflection of the nonlinear polarization, transparent medium, high crystallographic symmetry, Kleinman symmetry, easy crystal orientation along a high-symmetry direction, phase matching conditions and negligible interference among nonlinear waves, which may lead to large errors in the reported material properties. To avoid these approximations, we have developed an open-source package named Second Harmonic Analysis of Anisotropic Rotational Polarimetry in Multilayers (♯SHAARP.ml). The reliability and accuracy are established by experimentally benchmarking with both the SHG polarimetry and Maker fringes using standard and commonly used nonlinear optical materials as well as twisted 2-dimensional heterostructures.

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Sn-modified BaTiO3 thin film with enhanced polarization

Cited by 4 publications

References 34 publications

Alumina-Titania Nanolaminate Condensers for Hot Programmable Catalysis

Alumina-Titania Nanolaminate Condensers for Hot Programmable Catalysis

Alumina–Titania Nanolaminate Condensers for Hot Programmable Catalysis

Optical second harmonic generation in anisotropic multilayers with complete multireflection of linear and nonlinear waves using ♯SHAARP.ml package

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