Investigación

 

Growth and characterization of β–InN films on MgO: the key role of a β–GaN buffer layer in growing cubic InN

 

H. Navarro–Contreras, M. Pérez Caro, A.G. Rodríguez, E. López–Luna, and M.A. Vidal

 

Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luís Potosí, Álvaro Obregón 64, San Luis Potosí, S.L.P. 78000, México.

 

Recibido el 16 de enero de 2012.
Aceptado el 9 de febrero de 2012.

 

Abstract

Cubic InN samples were grown on MgO (001) substrates by gas source molecular beam epitaxy (GSMBE). In general, we find that InN directly deposited onto the MgO substrate results in polycrystalline or columnar films of hexagonal symmetry. We find that adequate conditions to grow the cubic phase of this compound require the growth of an initial cubic GaN buffer interlayer (β–tGaN) on the MgO surface. Subsequently, the growth conditions were optimized to obtain good photoluminescence (PL) emission. The resultant InN growth is mostly cubic, with very small hexagonal inclusions, as confirmed by X–ray diffraction (XRD) and scanning electron microscopy (SEM) studies. Good crystalline quality requires that the samples to be grown under rich Indium metal flux. The cubic β–tInN/GaN/MgO samples exhibit a high signal to noise ratio for PL at low temperatures (20 K). The PL is centered at 0.75 eV and persists at room temperature.

Keywords: A3. Molecular beam epitaxy; B2. semiconducting III–V materials; B1. nitrides; cubic indium nitride.

 

PACS: 61.05jh; 81.15Hi; 81.05Ea

 

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Acknowledgements

The authors acknowledge the financial support from Consejo Nacional de Ciencia y Tecnología (CONACyT) through grants 152155, Mexico; from FAI–UASLP, and FRC–UASLP, as well as the access to the facilities of the Laboratorio Nacional de Nanomateriales–IPICYT, during the course of this research.

 

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