Czochralski-Based Growth and Characteristics of Selected Novel Single Crystals for Optical Applications

Shimamura, Kiyoshi; Vı́llora, Encarnación G.

doi:10.12693/aphyspola.124.265

Cited by 20 publications

(13 citation statements)

References 37 publications

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“…[90][91][92] at Tamura Corp., Japan. The substrates were fabricated by slicing from bulk crystals according to their intended surface orientation, and then single-side polished.…”

Section: Methodsmentioning

confidence: 99%

“…Single crystals of β-Ga 2 O 3 were grown by the edgedefined film-fed growth method described in Refs. [92][93][94] at Tamura Corp., Japan. The substrates were fabricated by slicing from bulk crystals according to their intended surface orientation, and then single side polished.…”

Section: Methodsmentioning

confidence: 99%

“…This assumption is reasonable since both specimens were cut from the same bulk crystal. However, small gradients in Sn dopant volume density may exist throughout the bulk crystal due to the directional growth method and diffusion gradients near the solution solid interface [90,92]. The resulting LPP mode frequencies are then summarized in Table III.…”

Section: -11mentioning

confidence: 99%

“…Data in square brackets were deduced assuming isotropic reflectance likely leading to erroneous TO parameters. to the directional growth method and diffusion gradients near the solution solid interface [92,94]. The resulting LPP mode frequencies are then summarized in Tab.…”

Section: B Lpp Modesmentioning

confidence: 99%

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Anisotropy, phonon modes, and free charge carrier parameters in monoclinicβ-gallium oxide single crystals

et al. 2016

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We derive a dielectric function tensor model approach to render the optical response of monoclinic and triclinic symmetry materials with multiple uncoupled infrared and far-infrared active modes. We apply our model approach to monoclinic β-Ga 2 O 3 single-crystal samples. Surfaces cut under different angles from a bulk crystal, (010) and (201), are investigated by generalized spectroscopic ellipsometry within infrared and far-infrared spectral regions. We determine the frequency dependence of 4 independent β-Ga 2 O 3 Cartesian dielectric function tensor elements by matching large sets of experimental data using a point-by-point data inversion approach. From matching our monoclinic model to the obtained 4 dielectric function tensor components, we determine all infrared and far-infrared active transverse optic phonon modes with A u and B u symmetry, and their eigenvectors within the monoclinic lattice. We find excellent agreement between our model results and results of density functional theory calculations. We derive and discuss the frequencies of longitudinal optical phonons in β-Ga 2 O 3 . We derive and report density and anisotropic mobility parameters of the free charge carriers within the tin-doped crystals. We discuss the occurrence of longitudinal phonon plasmon coupled modes in β-Ga 2 O 3 and provide their frequencies and eigenvectors. We also discuss and present monoclinic dielectric constants for static electric fields and frequencies above the reststrahlen range, and we provide a generalization of the Lyddane-Sachs-Teller relation for monoclinic lattices with infrared and far-infrared active modes. We find that the generalized Lyddane-Sachs-Teller relation is fulfilled excellently for β-Ga 2 O 3 .

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“…[90][91][92] at Tamura Corp., Japan. The substrates were fabricated by slicing from bulk crystals according to their intended surface orientation, and then single-side polished.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: -11mentioning

confidence: 99%

Section: B Lpp Modesmentioning

confidence: 99%

See 2 more Smart Citations

Anisotropy, phonon modes, and free charge carrier parameters in monoclinicβ-gallium oxide single crystals

et al. 2016

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“…[52][53][54]. Samples were then cut at different orientations to the dimensions of 650 μm × 10 mm × 10 mm, and then polished on one side.…”

Section: Methodsmentioning

confidence: 99%

Band-to-band transitions, selection rules, effective mass, and excitonic contributions in monoclinic β−Ga2O3

et al. 2017

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We employ an eigenpolarization model including the description of direction dependent excitonic effects for rendering critical point structures within the dielectric function tensor of monoclinic β-Ga 2 O 3 yielding a comprehensive analysis of generalized ellipsometry data obtained from 0.75-9 eV. The eigenpolarization model permits complete description of the dielectric response. We obtain, for single-electron and excitonic band-to-band transitions, anisotropic critical point model parameters including their polarization vectors within the monoclinic lattice. We compare our experimental analysis with results from density functional theory calculations performed using the Gaussian-attenuation-Perdew-Burke-Ernzerhof hybrid density functional. We present and discuss the order of the fundamental direct band-to-band transitions and their polarization selection rules, the electron and hole effective mass parameters for the three lowest band-to-band transitions, and their excitonic contributions. We find that the effective masses for holes are highly anisotropic and correlate with the selection rules for the fundamental band-to-band transitions. The observed transitions are polarized close to the direction of the lowest hole effective mass for the valence band participating in the transition.

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Advanced spinel ceramics with highest VUV-vis transparency

Ikesue¹,

Aung²

2020

Journal of the European Ceramic Society

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Czochralski-Based Growth and Characteristics of Selected Novel Single Crystals for Optical Applications

Cited by 20 publications

References 37 publications

Anisotropy, phonon modes, and free charge carrier parameters in monoclinicβ-gallium oxide single crystals

Anisotropy, phonon modes, and free charge carrier parameters in monoclinicβ-gallium oxide single crystals

Band-to-band transitions, selection rules, effective mass, and excitonic contributions in monoclinic β−Ga2O3

Advanced spinel ceramics with highest VUV-vis transparency

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