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Pellegrino, Anna L.
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Publications (3/3 displayed)
- 2023Efficient Optimization of High‐Quality Epitaxial Lithium Niobate Thin Films by Chemical Beam Vapor Deposition: Impact of Cationic Stoichiometrycitations
- 2022A molecular route to fluoro-perovskite materials: synthesis of CsCaF3 films through a sol–gel/spin-coating processcitations
- 2020Piezoelectric Ba and Ti co-doped BiFeO<sub>3</sub> textured films: selective growth of solid solutions or nanocompositescitations
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article
Efficient Optimization of High‐Quality Epitaxial Lithium Niobate Thin Films by Chemical Beam Vapor Deposition: Impact of Cationic Stoichiometry
Abstract
<jats:title>Abstract</jats:title><jats:p>Lithium niobate is a material of special interest for its challenging functional properties, which can suit various applications. However, high quality 200‐mm Li<jats:sub>x</jats:sub>Nb<jats:sub>1‐x</jats:sub>O<jats:sub>3</jats:sub> thin film grown on sapphire substrate have never been reported so far which limits these potential applications. This paper reports the efficient optimization of high quality LiNbO<jats:sub>3</jats:sub> thin film deposition on sapphire (001) substrate through chemical beam vapor deposition in a combinatorial configuration. With this technique, flow ratio of Li/Nb can be tuned from ≈0.25 to ≈2.45 on a single wafer. Various complementary characterizations (by means of diffraction, microscopy and spectroscopy techniques) have been performed at different areas of the film (different cationic ratios) in order to investigate the impact of the cationic stoichiometry deviation on the film properties. Close to cationic stoichiometry (LiNbO<jats:sub>3</jats:sub>), the epitaxial films are of high quality (single phase in spite of two in‐plane domains, low mosaicity of 0.04°, low surface roughness, refractive index and band gap close to bulk values). Deviating from the stoichiometry conditions, secondary phases are detected (LiNb<jats:sub>3</jats:sub>O<jats:sub>8</jats:sub> for Nb‐rich flow ratios, and Li<jats:sub>3</jats:sub>NbO<jats:sub>4</jats:sub> with partial amorphization for Li‐rich flow ratios). LiNbO<jats:sub>3</jats:sub> films are of high interest for various key applications in data communications among others.</jats:p>