Phase separation and ordering in group-III nitride alloys

Autor:	J. R. Leite, L. M. R. Scolfaro, M. Marques, Lara K. Teles, L. G. Ferreira
Rok vydání:	2004
Předmět:	Physics Condensed matter physics Strain (chemistry) Band gap Alloy General Physics and Astronomy Nitride engineering.material Condensed Matter::Materials Science Lattice constant engineering Light emission Ternary operation Cluster expansion
Zdroj:	Brazilian Journal of Physics v.34 n.2b 2004 Brazilian Journal of Physics Sociedade Brasileira de Física (SBF) instacron:SBF Brazilian Journal of Physics, Volume: 34, Issue: 2b, Pages: 593-597, Published: JUN 2004
ISSN:	0103-9733
DOI:	10.1590/s0103-97332004000400014
Popis:	The electronic, structural, and thermodynamic properties of cubic (zinc blende) group-III nitride ternary In xGa1-xN and quaternary Al xIn yGa1-x-yN alloys are investigated by combining first-principles total energy calculations and cluster expansion methods. External biaxial strain on the alloys are taken into account in the calculations. While alloy fluctuations and strain effects play a minor role in the physical properties of AlGaN, due to the small lattice-mismatch, in the InGaN alloys we found a remarkable influence of strain on the phase separation. The effect of biaxial strain on the formation of ordered phases has been also investigated, and the results are used to clarify the origin of the light emission process in In xGa1-xN based optoelectronic devices. The dependence of the lattice constant and energy bandgap in quaternary Al xIn yGa1-x-yN alloys was obtained as function of the compositions x and y. PACS: 61.66.Dk, 64.75.+g, 71.20.Nr
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20f1fc4fde14e504a58aecf1659a8262 https://doi.org/10.1590/s0103-97332004000400014 Zobrazit plný text záznamu