Syntheses of LiTaO<sub>3</sub>/LiNbO<sub>3</sub>Super-Lattice Thin Films and Their Optical Properties

Tsukahara, G.; Uesu, Yoshiaki

doi:10.1080/00150193.2010.484326

Cited by 3 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LN films on C-sapphire substrates were deposited also by PLD, using a KrF excimer laser with 248 nm-wavelength and using LiNbO 3 congruent crystal as a target [33][34][35]. The films were deposited at 550 • C. The oxygen pressure and laser power were 50 mTorr and 2 J cm −2 , respectively.…”

Section: Methodsmentioning

confidence: 99%

Identification of LiNbO₃, LiNb₃O₈and Li₃NbO₄phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy

Bartasyte

Plaušinaitienė

Abrutis

et al. 2013

J. Phys.: Condens. Matter

Self Cite

View full text Add to dashboard Cite

Phase composition of epitaxial/textured LiNbO3 films on sapphire substrates, grown by pulsed laser deposition, atmospheric pressure metal organic chemical vapor deposition and pulsed injection metal organic chemical vapor deposition was studied by conventional x-ray diffraction techniques. Raman spectroscopy, being highly sensitive to the symmetry of materials, was used as a countercheck in the compositional analysis. The wavenumbers of Raman modes of LiNb3O8 and Li3NbO4 phases were identified from Raman spectra of synthesized powders. Asymmetry of profiles of x-ray diffraction reflections of LiNbO3 films was studied. This asymmetry may have different origins which consequently may result in misleading conclusions about phase composition of textured LiNbO3 films.

show abstract

Section: Methodsmentioning

confidence: 99%

Identification of LiNbO₃, LiNb₃O₈and Li₃NbO₄phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy

Bartasyte

Plaušinaitienė

Abrutis

et al. 2013

J. Phys.: Condens. Matter

Self Cite

View full text Add to dashboard Cite

show abstract

“…As such, a shift changes the material's band-edge positions concerning the water and CO 2 potentials, it is necessary to align the NBO 5 /NTO 5 bandedges with such potentials to support its applicability, which has been systematically done in the following section. Despite the very few related theoretical and experimental reports, it is noteworthy that similar optical effects were found in similar superlattices, 33,73,74 where the improvement in absorption is always attributed to interfacial phenomena and the formation of effective heterostructures. Band-Edge Positions.…”

Section: ■ Results and Discussionmentioning

confidence: 79%

NaNbO₃/NaTaO₃ Superlattices: Cation-Ordering Improved Band-Edge Alignment for Water Splitting and CO₂ Photocatalysis

2021

View full text Add to dashboard Cite

Perovskite oxide heterostructures have been extensively investigated for their excellent photocatalytic properties. Here, through hybrid density functional theory calculations, we systematically investigate the formation of NaNbO 3 −NaTaO 3 (NBO-NTO) heterostructures. The sequential cations replacement in the superlattices reveals the Nb−Ta ratio range that allows the effective formation of heterostructures, which occurs through a spontaneous polarization mechanism induced by the electrostatic potential discontinuity in the interface. The resulting cation ordering is responsible for the sawtoothlike potential distribution that spatially separates valence and conduction charges and reduces the heterostructure bandgap. The symmetric NBO 5 /NTO 5 junction has the smallest bandgap (2.50 eV) whose transitions are associated with Nb 5d xy orbitals on the interfacial plane. Such a relaxation mechanism provides the heterostructure with anisotropic optical properties and interface absorption peaks closer to the visible light spectrum. The phenomena strongly suggest the use of these heterostructures in photocatalytic reactions, supported by their coherent band-edge alignment with both water splitting and CO 2 reforming potentials.

show abstract

“…To summarize, the growth of thin films for photonic application made by both physical and chemical methods offers new opportunities for abrupt index profiles on different substrates, luminescence‐doped films, damage‐resistant guides, complex heterostructures, or superlattices . Moreover, epitaxial thin films could also offer more robust processing strength.…”

Section: Physical Properties and Targeted Applicationsmentioning

confidence: 99%

Toward High‐Quality Epitaxial LiNbO₃ and LiTaO₃ Thin Films for Acoustic and Optical Applications

Bartasyte

Margueron

Baron

et al. 2017

Adv Materials Inter

View full text Add to dashboard Cite

In 1928, Zachariasen discovered the LiNbO 3 phase. [1] The first single crystals were grown using the flux method by Matthias Over the past five decades, LiNbO 3 and LiTaO 3 single crystals and thin films have been studied intensively for their exceptional acoustic, electro-optical, and pyroelectric and ferroelectric properties. Today, LiNbO 3 single crystals in electro-optics are equivalent to silicon in electronics, and about 70% of radio-frequency (RF) filters, based on surface acoustic waves, are fabricated on these single crystals. These materials in the form of thin films are needed urgently for the development of the next-generation of high-frequency and/or wide-band RF filters or tuneable frequency filters adapted to the fifth generation of infrastructures/networks/communications. The integration of LiNbO 3 films in guided nanophotonic devices will allow higher operational frequencies, wider bandwidth, and miniaturized optical devices in line with improved electronic conversion. Here, the challenges and the achievements in the epitaxial growth of LiTaO 3 and LiNbO 3 thin films and their integration with silicon technology and to acoustic and guided nanophotonic devices are discussed in detail. The systematic representation and classification of all epitaxial relationships reported in the literature have been carried out in order to help the prediction of the epitaxial orientations in the new heterostructures. Future prospects of potential applications and the expected performances of thin film devices are overviewed, as well.Figure 2. Schematic representation of the layer transfer process by the ion slicing technique consisting of a) ion implantation, b) wafer bonding, c) laser irradiation or heating in order to obtain d) a single crystalline layer on the host (Si) substrate. Reproduced with permission. [53]Figure 3. a,b) Electron microscopy images and c) schematic diagram of a microresonator based on LiNbO 3 film on Si and fabricated by the layer transfer technique. Reproduced with permission. [53]The first reports on the growth of c-axis-oriented LN films by liquid phase epitaxy on an LT substrate and by RF sputtering Adv. Mater. Interfaces 2017, 4, 1600998 www.advmatinterfaces.de www.advancedsciencenews.com Figure 6. Frequency response of a) HBAR and b) FBAR based on thinned X-cut LiNbO 3 layer on Si. Schematic representations of a) HBAR and b) FBAR structures are given in the insets. Reproduced with permission. [78]

show abstract

Syntheses of LiTaO₃/LiNbO₃Super-Lattice Thin Films and Their Optical Properties

Cited by 3 publications

References 4 publications

Identification of LiNbO₃, LiNb₃O₈and Li₃NbO₄phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy

Identification of LiNbO₃, LiNb₃O₈and Li₃NbO₄phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy

NaNbO₃/NaTaO₃ Superlattices: Cation-Ordering Improved Band-Edge Alignment for Water Splitting and CO₂ Photocatalysis

Toward High‐Quality Epitaxial LiNbO₃ and LiTaO₃ Thin Films for Acoustic and Optical Applications

Contact Info

Product

Resources

About

Syntheses of LiTaO3/LiNbO3Super-Lattice Thin Films and Their Optical Properties

Cited by 3 publications

References 4 publications

Identification of LiNbO3, LiNb3O8and Li3NbO4phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy

Identification of LiNbO3, LiNb3O8and Li3NbO4phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy

NaNbO3/NaTaO3 Superlattices: Cation-Ordering Improved Band-Edge Alignment for Water Splitting and CO2 Photocatalysis

Toward High‐Quality Epitaxial LiNbO3 and LiTaO3 Thin Films for Acoustic and Optical Applications

Contact Info

Product

Resources

About

Syntheses of LiTaO₃/LiNbO₃Super-Lattice Thin Films and Their Optical Properties

Identification of LiNbO₃, LiNb₃O₈and Li₃NbO₄phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy

Identification of LiNbO₃, LiNb₃O₈and Li₃NbO₄phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy

NaNbO₃/NaTaO₃ Superlattices: Cation-Ordering Improved Band-Edge Alignment for Water Splitting and CO₂ Photocatalysis

Toward High‐Quality Epitaxial LiNbO₃ and LiTaO₃ Thin Films for Acoustic and Optical Applications