Growth of non-polar ZnO/(Zn,Mg)O quantum well structures on R-sapphire by plasma-assisted molecular beam epitaxy

• Published in: Journal of crystal growth Vol. 301; pp. 366 - 369
• Main Authors: Chauveau, J.-M., Buell, D.A., Laügt, M., Vennéguès, P., Teisseire-Doninelli, M., Berard-Bergery, S., Deparis, C., Lo, B., Vinter, B., Morhain, C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2007; Elsevier
• Subjects: A3. Molecular beam epitaxy; B1. Oxides; B2. Semiconducting II–VI materials; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Molecular, atomic, ion, and chemical beam epitaxy; Nanoscale materials and structures: fabrication and characterization; Other topics in nanoscale materials and structures; Physics; Quantum wells; Theory and models of film growth; B1. Oxides; 78.67.Hc; A3. Molecular beam epitaxy; 81.05.Dz; B2. Semiconducting II–VI materials; 68.65.Fg; 81.15.Hi; Confinement; A3. Molecular beam epitaxy; Bl. Oxides; B2. Semiconducting II-VI materials; Quantum wells; 81.05.Dz; 81.15.Hi; 78.67.Hc; 68.65.Fg; Photoluminescence; Plasma assisted processing; Quantum confined Stark effect; Physical properties; Zinc oxides; II-VI semiconductors; Sapphire; Electric field effects; Growth mechanism; Molecular beam epitaxy; Nanostructured materials; Heterostructures
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2006.11.320

Zinc oxide (ZnO) has recently attracted considerable attention because of its unique physical properties and its potential applications in the blue and UV spectral range. Up to now, ZnO-based heterostructures have mostly been grown in a c-orientation. The growth of non-polar layers along the a-direction [ 1 1 2 ¯ 0 ] was proposed to avoid any built-in electric fields in the c-direction. A series of A-plane ( 1 1 2 ¯ 0 ) ZnO quantum wells (QWs) and multiple QWs embedded in (Zn,Mg)O barriers were grown on an optimized (Zn,Co)O buffer. After the structural and optical characterization of the buffers and the QWs, we have compared the PL emission of a-oriented and c-oriented QWs. From this comparison, we demonstrate that the QWs exhibit confinement but no indication of quantum-confined Stark effect, contrary to what is observed in c-oriented structures.