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| Format: | Artículo científico |
| Language: | en |
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Sociedade Brasileira de Física
2004
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| Online Access: | https://www.redalyc.org/articulo.oa?id=46434413 |
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Table of Contents:
- Phase Separation and Ordering in Group-III Nitride Alloys L. K. Teles M. Marques J. R. Leite L. M. R. Scolfaro Física, Astronomía y Matemáticas The electronic, structural, and thermodynamic properties of cubic (zinc blende) group-III nitride ternaryInxGa1−xN and quaternary AlxInyGa1−x−yN alloys are investigated by combining first-principles totalenergy calculations and cluster expansion methods. External biaxial strain on the alloys are taken into accountin the calculations. While alloy fluctuations and strain effects play a minor role in the physical properties ofAlGaN, due to the small lattice-mismatch, in the InGaN alloys we found a remarkable influence of strain onthe 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 InxGa1−xN based optoelectronicdevices. The dependence of the lattice constant and energy bandgap in quaternary AlxInyGa1−x−yN alloyswas obtained as function of the compositions x and y.PACS: 61.66.Dk, 64.75.+g, 71.20.Nr 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434413 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2B Vol.34