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Home » New Publication! “Germanium dioxide: A new rutile substrate for epitaxial film growth”

New Publication! “Germanium dioxide: A new rutile substrate for epitaxial film growth”

September 1, 2022 By Matt Webb

Abstract: Rutile compounds have exotic functional properties that can be applied for various electronic applications; however, the limited availability of epitaxial substrates has restricted the study of rutile thin films to a limited range of lattice parameters. Here, rutile GeO2 is demonstrated as a new rutile substrate with lattice parameters of 𝑎=4.398 Å and 𝑐=2.863 Å. Rutile GeO2 single crystals up to 4 mm in size are grown by the flux method. X-ray diffraction reveals high crystallinity with a rocking curve having a full width half-maximum of 0.0572°. After mechanical polishing, a surface roughness of less than 0.1 nm was obtained, and reflection high-energy electron diffraction shows a crystalline surface. Finally, epitaxial growth of (110)-oriented TiO2 thin films on GeO2 substrates was demonstrated using molecular beam epitaxy. Templated by rutile GeO2 substrates, our findings open the possibility of stabilizing new rutile thin films and strain states for the tuning of physical properties.

Full text available from Journal of Vacuum Science & Technology A

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Filed Under: Publications

News

  • New Publication! “Geometric defects induced by strain relaxation in thin film oxide superlattices.” November 10, 2022
  • New Publication! “Nanophotonic control of thermal emission under extreme temperatures in air” September 29, 2022
  • New Publication! “Germanium dioxide: A new rutile substrate for epitaxial film growth” September 1, 2022

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Our work is multidisciplinary. We employ concepts and tools from the fields of materials science, chemistry, physics and electrical engineering to develop new methods to investigate and engineer … Read More

News

New Publication! “Geometric defects induced by strain relaxation in thin film oxide superlattices.”

November 10, 2022 By Matt Webb

New Publication! “Nanophotonic control of thermal emission under extreme temperatures in air”

September 29, 2022 By Matt Webb

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