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Preferential Orientation of Photochromic Gadolinium Oxyhydrides

preprint
submitted on 27.05.2020 and posted on 28.05.2020 by Elbruz Murat Baba, Jose Montero, Dmitrii Moldarev, Marcos V. Moro, Max Wolff, Daniel Primetzhofer, Sabrina Sartori, Esra Zayim, Smagul Zh. Karazhanov

We report preferential orientation control in photochromic gadolinium oxyhydride (GdHO) thin films deposited by a two-step process. Gadolinium hydride (GdH2-x) films were grown by reactive magnetron sputtering, followed by oxidation in air. The preferential orientation, grain size, anion concentrations, and photochromic response of the films are strongly dependent on the deposition pressure. GdHO films show preferential orientation along the [100] direction and exhibit photochromism when synthesized at deposition pressures up to 5.8 Pa and. The photochromic contrast is larger than 20 % when the films are deposited below 2.8 Pa with 0.22 H2/Ar flow ratio. We argue that the degree of preferential orientation defines the oxygen concentration which is known to be a key parameter for photochromism in rare-earth oxyhydride thin films. The experimental observations described above are explained by the oxidation-induced decrease of the grain size as a result of the increase of the deposition pressure of the sputtering gas.

History

Email Address of Submitting Author

elbruz.baba@ife.no

Institution

Institute for Energy Technology

Country

Norway

ORCID For Submitting Author

0000-0002-9046-0208

Declaration of Conflict of Interest

There are no conflicting interests

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