Properties of self-oxidized single crystalline perovskite N : BaTiO$_3$ oxynitride epitaxial thin films

Anyssa Derj (1) , Hélène Magnan (1) , Cristian Mocuta (2) , Patrick Le Fèvre (2) , Jocelyne Leroy (3) , Antoine Barbier (1)

1 LNO - Laboratoire Nano-Magnétisme et Oxydes
2 SSOLEIL - Synchrotron SOLEIL
3 LICSEN UMR 3685 - Laboratoire Innovation en Chimie des Surfaces et NanoSciences

Epitaxial perovskite self-oxidized oxynitride N : BaTiO$_3$thin films, deposited on 1% Nb-doped SrTiO$_3$(001) single crystals, were obtained by atomic nitrogen assisted molecular beam epitaxy without supplying additional oxygen gas. Their growth, crystalline and electronic structures as well as photo-electrochemical and optical properties were investigated and compared to those of pure BaTiO$_3$ films grown with atomic oxygen on the same substrate. More tetragonal perovskite crystalline structures, profound electronic structure modifications, improved photo-electrochemical properties and an enhanced (almost 10%) optical window for light absorption are demonstrated. This new class of compounds shows promise for a large panel of new applications based on visible light absorption.

Domaines: Matériaux

Anyssa Derj, Hélène Magnan, Cristian Mocuta, Patrick Le Fèvre, Jocelyne Leroy, et al.. Properties of self-oxidized single crystalline perovskite N : BaTiO$_3$ oxynitride epitaxial thin films. Materials Advances, 2022, 3, pp.3135-3142. ⟨10.1039/D1MA01082D⟩. ⟨cea-03627060⟩