Crystalline magnesium nitride ( ): From epitaxial growth to fundamental physical properties
- 11 May 2020
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Materials
- Vol. 4 (5), 054601
- https://doi.org/10.1103/physrevmaterials.4.054601
Abstract
Single-crystalline thin films are grown on MgO (100) substrates with plasma-assisted molecular beam epitaxy. To prevent the oxidation of the films and allow further physical characterization, a polycrystalline MgO cap is deposited in situ. The growth orientation of the films can be tuned from (100) to (111) by changing the growth conditions, and the associated epitaxial relationships have been determined by means of x-ray diffraction. The lattice constant of films has been monitored as a function of temperature from 300 to 900 K, determining thereby the linear thermal expansion coefficient. Transmission measurements indicate an optical bandgap of crystalline around 2.9 eV at room temperature, consistent with diffuse reflectance measurements on micrometric particles. These results demonstrate the possibility of exploiting as a new crystalline semiconductor in the blue-violet range.
Keywords
Funding Information
- Agence Nationale de la Recherche (ANR-17-CE24-0043-01)
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