Electrical Transport and Optical Properties of Hydrogen-Deficient YH<sub>2</sub>Films

Sakai, Masamichi; Kontani, Toru; Nakamura, Osamu; Takeyama, Keishi; Uwatoko, Yoshiya; Obi, Y.; Takanashi, Kōki

doi:10.1143/jjap.43.681

Cited by 12 publications

(12 citation statements)

References 4 publications

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“…We have not been able to quantify the hydrogen content of our samples, but comparation of the optical measurements to similar studies [4,17,18] gives a strong indication that the transparent samples have a composition close to YH 3 and the black samples have a composition close to YH 2 .…”

Section: Optical Propertiesmentioning

confidence: 77%

Transparent yttrium hydride thin films prepared by reactive sputtering

Mongstad

Platzer‐Björkman

Karazhanov

et al. 2011

Journal of Alloys and Compounds

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Metal hydrides have earlier been suggested for utilization in solar cells. With this as a motivation we have prepared thin films of yttrium hydride by reactive magnetron sputter deposition. The resulting films are metallic for low partial pressure of hydrogen during the deposition, and black or yellow-transparent for higher partial pressure of hydrogen. Both metallic and semiconducting transparent YH x films have been prepared directly in-situ without the need of capping layers and post-deposition hydrogenation. Optically the films are similar to what is found for YH x films prepared by other techniques, but the crystal structure of the transparent films differ from the well-known YH 3−η phase, as they have an fcc lattice instead of hcp.

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Section: Optical Propertiesmentioning

confidence: 77%

Transparent yttrium hydride thin films prepared by reactive sputtering

Mongstad

Platzer‐Björkman

Karazhanov

et al. 2011

Journal of Alloys and Compounds

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“…5 It arises from a combination of weak free electron and inter-band absorption near the plasma frequency. The position (wavelength) of the dihydride window has been reported to shift with hydrogen/metal ratio 15,16 as well as Y/La ratio in alloyed hydrides. 5 We do not find any systematic correlation of the transmittance window peak wavelength with the cation size or lattice constant.…”

Section: A)mentioning

confidence: 99%

Photochromism of rare-earth metal-oxy-hydrides

Nafezarefi

Schreuders

Dam

et al. 2017

Applied Physics Letters

104

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Recently, thin films of yttrium oxy-hydride (YOxHy) were reported to show an unusual color-neutral photochromic effect promising for application in smart windows. Our present work demonstrates that also oxy-hydrides based on Gd, Dy, and Er have photochromic properties and crystal structures similar to YOxHy. Compared to YOxHy, the optical bandgaps of the lanthanide based oxy-hydrides are smaller while photochromic contrast and kinetics show large variation among different cations. Based on these findings, we propose that cation alloying is a viable pathway to tailor the photochromic properties of oxy-hydride materials. Furthermore, we predict that the oxy-hydrides of the other lanthanides are also potentially photochromic.

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“…7 The YH 2+␦ films used in the present study have carrier relaxation times of ϳ10 −13 s at room temperature, 6 implying that fields larger than 50 T are necessary to reach saturation even for vacuum electron mass. The TMR of compensated metals can be characterized experimentally in terms of the quadratic field dependence, while that of uncompensated metals saturates under a strong field condition, i.e., B 1, where is the carrier mobility.…”

Section: Introductionmentioning

confidence: 88%

“…6 These small values of the Hall coefficients observed in YH 2+␦ were interpreted in terms of the presence of holes as well as electrons in YH 2+␦ , though the interpretation was qualitative. As reported in our previous study, as-deposited Y films show negative Hall coefficients of ϳ−10 −10 m 3 / C, while YH 2+␦ ͑−0.3Ͻ ␦ Ͻ 0.05͒ films show positive Hall coefficients, but with a considerably smaller magnitude less than 4 ϫ 10 −11 m 3 /C.…”

Section: Introductionmentioning

confidence: 97%

Magnetotransport properties in near-stoichiometric hydride films of YH2+δ under weak fields

Sakai

Nanbo

Nakamura

et al. 2007

Journal of Applied Physics

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Articles you may be interested inElectrical and optical characterization of the metal-insulator transition temperature in Cr-doped VO2 thin films Magnetic, magnetotransport, and optical properties of Al-doped Zn 0.95 Co 0.05 O thin films Appl. Phys. Lett. 90, 242508 (2007); 10.1063/1.2748343Electrical properties of nearly stoichiometric GaAs grown by molecular beam epitaxy at low temperatureWe have investigated the basic characteristics of mobile carriers in as-deposited thin films of hexagonal-close-packed Y and hydrogenated films of face-centered-cubic YH 2+␦ . Hall resistance and transverse magnetoresistance measurements were carried out under magnetic fields of up to 1 T at room temperature. The Hall coefficient in YH 2+␦ showed a minimum value of ϳ5 ϫ 10 −12 m 3 / C when the ␦ value reached ϳ−0.1, in accordance with the ␦ dependence of resistivity reported previously. Quantitative analysis based on the present measurements revealed that YH 2+␦ is a compensated metal whose carrier density and mobility were determined to be ϳ1.4ϫ 10 27 ͑ϳ1.9ϫ 10 27 ͒ m −3 and ϳ3.5ϫ 10 −3 ͑ϳ3.1ϫ 10 −3 ͒ m 2 V −1 s −1 , respectively, for ␦ = 0.04 ͑−0.03͒ for both electrons and holes. These carrier parameters were found to account concurrently for the reflection spectral line shapes observed. The compensation observed in YH 2+␦ is at variance with a simple criterion used previously ͓E. Fawcett and W. A. Reed, Phys. Rev. 131, 2463 ͑1963͔͒.

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Electrical Transport and Optical Properties of Hydrogen-Deficient YH₂Films

Cited by 12 publications

References 4 publications

Transparent yttrium hydride thin films prepared by reactive sputtering

Transparent yttrium hydride thin films prepared by reactive sputtering

Photochromism of rare-earth metal-oxy-hydrides

Magnetotransport properties in near-stoichiometric hydride films of YH2+δ under weak fields

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Electrical Transport and Optical Properties of Hydrogen-Deficient YH2Films

Cited by 12 publications

References 4 publications

Transparent yttrium hydride thin films prepared by reactive sputtering

Transparent yttrium hydride thin films prepared by reactive sputtering

Photochromism of rare-earth metal-oxy-hydrides

Magnetotransport properties in near-stoichiometric hydride films of YH2+δ under weak fields

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Electrical Transport and Optical Properties of Hydrogen-Deficient YH₂Films