Ab initio calculation of structural and electronic properties of AlxGa1-xN and InxGa1-xN alloys
Using the density functional theory (DFT) with the generalized gradient approximation (GGA), we calculated the structural and electronic properties of wurtzite AlN, GaN, InN, and their related alloys, <img src="../../../../../img/revistas/rmf/v56n3/a1s2.jpg">. We have performed accur...
| Autores: | , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | México |
| Recursos: | Instituto Politécnico Nacional |
| Repositorio: | Redalyc-IPN |
| OAI Identifier: | oai:redalyc.org:57019192001 |
| Acesso em linha: | https://www.redalyc.org/articulo.oa?id=57019192001 |
| Access Level: | acceso abierto |
| Palavra-chave: | Física, Astronomía y Matemáticas Ab initio calculations nitride semiconductor alloys |
| Resumo: | Using the density functional theory (DFT) with the generalized gradient approximation (GGA), we calculated the structural and electronic properties of wurtzite AlN, GaN, InN, and their related alloys, <img src="../../../../../img/revistas/rmf/v56n3/a1s2.jpg">. We have performed accurate ab initio total energy calculations using the full-potential linearized augmented plane wave (FP-LAPW) method to investigate their structural and electronic properties. We found that in both alloys the fundamental parameters do not follow Vergard's law. The lattice parameters, a, c, and u, for the <img src="../../../../../img/revistas/rmf/v56n3/a1s3.jpg">alloy are found to exhibit positive bowing parameters, while for <img src="../../../../../img/revistas/rmf/v56n3/a1s4.jpg">there is a negative bowing for the a and c parameters and a positive bowing for the internal parameter, u. We calculated as well the nearest neighbor and next nearest neighbor distances, as a function of the concentration, and we obtained a good agreement with experimental results. Furthermore, we found that for both alloys, the band gap does not follows the Vegard law. As a by-product of our electronic band structure calculations, the effective masses of the binary compounds and their alloys were calculated. All the calculated properties show good agreement with most of the previously reported results. Finally, using the frozen phonon approach, the A1(TO) mode for the different systems studied in this work was calculated. Our calculations show good agreement with experimental values reported for the binary compounds. For the ternary alloys, our calculations reproduce experimental values for <img src="../../../../../img/revistas/rmf/v56n3/a1s3.jpg">as well as theoretical predictions for <img src="../../../../../img/revistas/rmf/v56n3/a1s4.jpg">. |
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