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Aliovalent Calcium Doping of Yttrium Oxyhydride Thin Films and Implications for Photochromism.

ABSTRACT: To develop an understanding of the photochromic effect in rare-earth metal oxyhydride thin films (REH3-2x O x , here RE = Y), we explore the aliovalent doping of the RE cation. We prepared Ca-doped yttrium oxyhydride thin films ((Ca z Y1-z )H x O y ) by reactive magnetron cosputtering with Ca doping concentrations between 0 and 36 at. %. All of the films are semiconductors with a constant optical band gap for Ca content below 15%, while the band gap expands for compositions above 15%. Ca doping affects the photochromic properties, resulting in (1) a lower photochromic contrast, likely due to a lower H- concentration, and (2) a faster bleaching speed, caused by a higher pre-exponential factor. Overall, these results point to the importance of the H- concentration for the formation of a "darkened" phase and the local rearrangement of these H- for the kinetics of the process.

SUBMITTER: Chaykina D 

PROVIDER: S-EPMC9442641 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature

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Aliovalent Calcium Doping of Yttrium Oxyhydride Thin Films and Implications for Photochromism.

Chaykina Diana D   Usman Ismene I   Colombi Giorgio G   Schreuders Herman H   Tyburska-Pueschel Beata B   Wu Ziying Z   Eijt Stephan W H SWH   Bannenberg Lars J LJ   de Wijs Gilles A GA   Dam Bernard B  

The journal of physical chemistry. C, Nanomaterials and interfaces 20220819 34

To develop an understanding of the photochromic effect in rare-earth metal oxyhydride thin films (REH<sub>3-2<i>x</i></sub> O <sub><i>x</i></sub> , here RE = Y), we explore the aliovalent doping of the RE cation. We prepared Ca-doped yttrium oxyhydride thin films ((Ca <sub><i>z</i></sub> Y<sub>1-<i>z</i></sub> )H <sub><i>x</i></sub> O <sub><i>y</i></sub> ) by reactive magnetron cosputtering with Ca doping concentrations between 0 and 36 at. %. All of the films are semiconductors with a constant  ...[more]

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