Solid state Gd–Mg electrochromic devices with ZrO2Hx electrolyte

Sluis, P. van der; Mercier, Virginie

doi:10.1016/s0013-4686(01)00375-9

Cited by 33 publications

(15 citation statements)

References 11 publications

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“…Yttrium metal films can absorb hydrogen and become yellowish transparent when the wide band gap semiconductor yttrium trihydride (YH 3 , E g = 2.6 eV [10]) is formed. Yttrium hydride and the similar rare earth hydrides have been investigated for applications in smart windows, and an all-solid-state electrochromic device based on the phenomenon has been demonstrated [11]. Photochromism and persistent photoconductivity in transparent yttrium hydride have been reported earlier at extremely low temperatures [12] and at extreme H 2 pressure (5.8 GPa) and high light intensity [13], but for yttrium hydride the current report is the first report of these phenomena at room temperature, ambient pressure and moderate light intensity.…”

Section: Introductionmentioning

confidence: 99%

A new thin film photochromic material: Oxygen-containing yttrium hydride

Mongstad

Platzer‐Björkman

Mæhlen

et al. 2011

Solar Energy Materials and Solar Cells

115

118

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Abstract:In this work we report on photochromism in transparent thin film samples of oxygencontaining yttrium hydride. Exposure to visible and ultraviolet (UV) light at moderate intensity triggers a decrease in the optical transmission of visible and infrared (IR) light. The photo-darkening is colour-neutral. We show that the optical transmission of samples of 500 nm thickness can be reduced by up to 50% after one hour of illumination with light of moderate intensity. The reaction is reversible and samples that are left in the dark return to the initial transparent state. The relaxation time in the dark depends on the temperature of the sample and the duration of the light exposure. The photochromic reaction takes place under ambient conditions in the as-deposited state of the thin-film samples. Graphical abstract:Research highlights:-Photochromic response in the as-deposited state at ambient conditions -Sensitive to visible and ultraviolet light -Color-neutral photo-darkening -Persistent photoconductivity accompanies the photochromic darkening -Reversible reaction, material relaxes back to transparent state when left in dark

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Section: Introductionmentioning

confidence: 99%

A new thin film photochromic material: Oxygen-containing yttrium hydride

Mongstad

Platzer‐Björkman

Mæhlen

et al. 2011

Solar Energy Materials and Solar Cells

115

118

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“…The magnesium provides colour neutrality in the transparent state and gives an intermediate, optically highly absorbing state. A solid-state device based on a gadolinium-magnesium alloy has been fabricated [4]. Richardson et al [5] have shown that magnesium can also be alloyed with the first-row transition metals to provide optical switching properties.…”

Section: Introductionmentioning

confidence: 99%

Structure of the Mg2Ni switchable mirror: an EXAFS investigation

Vece

Eerden

Grandjean

et al. 2005

Materials Chemistry and Physics

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Hydrogen intercalation changes both the structure and the optical properties of Mg 2 Ni thin films. The structure of evaporated thin films was investigated in the as-deposited, hydrogenated and dehydrogenated states with extended X-ray absorption fine structure (EXAFS) and X-ray diffraction (XRD). The partially crystalline virgin film becomes completely amorphous upon hydrogenation. After removal of the intercalated hydrogen the film remains amorphous. Hydrogen was detected in different concentrations in the virgin, hydrogenated and dehydrogenated films. Hydrogen loading was confirmed both by a shift of the nickel absorption edge and an increase of the hydrogen content. The intercalated hydrogen in the completely loaded film is located around the nickel atom with a coordination close to four.

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“…The metal-insulator transition corresponding to a change from the optically opaque to the transparent state is an interesting phenomenon that can be applied in electro-optical devices. 2 This metal-insulator transition occurs by hydrogen intercalation with the metal going from the di-to trihydride state.…”

Section: Introductionmentioning

confidence: 99%

X-ray absorption fine structure study of the structural and electronic properties of the GdMg hydride switchable mirror

et al. 2003

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Structural and electronic properties of the GdMg hydride switchable mirror have been studied with x-ray absorption fine structure ͑XAFS͒ spectroscopy at the Gd-L 3 edge. The analysis of the extended XAFS ͑EXAFS͒ data show phase segregation in the as-deposited film. The phase separation is enhanced by hydrogen intercalation. The structure of both the gadolinium clusters with low hydrogen concentration and the hydrogenloaded gadolinium trihydride clusters is found to be hcp. EXAFS detected hydrogen atoms as scatterers, in a highly ordered structure. The structure of the gadolinium trihydride cluster is consistent with the model in which the hydrogen atoms are shifted from octahedral positions to the metal plane. The intensity of the Gd L 3 x-ray absorption edge increases after loading with hydrogen, pointing to a higher number of holes in the d-valence band. This suggests that a fraction of the available charge is transferred to the hydrogen atoms. This charge transfer is thought to be responsible for the optical change of the gadolinium thin film.

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Solid state Gd–Mg electrochromic devices with ZrO2Hx electrolyte

Cited by 33 publications

References 11 publications

A new thin film photochromic material: Oxygen-containing yttrium hydride

A new thin film photochromic material: Oxygen-containing yttrium hydride

Structure of the Mg2Ni switchable mirror: an EXAFS investigation

X-ray absorption fine structure study of the structural and electronic properties of the GdMg hydride switchable mirror

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