Cathodoluminescence characterization of the band gap energy in dilute nitride GaNSbAs alloys [Poster]
| Autor: | Navarro, A., Martínez Sacristán, Óscar, Galiana, B., Lombardero, I., Ochoa, M., García, I., Gabás, M., Ballesteros, Carmen, Jiménez López, Juan Ignacio, Algora, C. |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Zdroj: | UVaDOC. Repositorio Documental de la Universidad de Valladolid instname |
| Popis: | The development of a high quality 1eV material is one of the most import challenges in high efficiency solar cells development. The GaInP/GaInAs/1eV/Ge structure attained one of the highest solar cell efficiency, 44.0%. The dilute nitride GaNSbAs has attracted a considerable interest, since this alloy can be grown lattice-matched to GaAs with a bandgap of 1eV. However, It is well-known that N incorporation in dilute nitrides is associated with the generation of structural defects and as a result, the degradation of the optical properties. Thermal annealing is the most common procedure to improve the dilute nitrides response. In order to have a deeper understanding of the GaNSbAs layer behaviour, the effects of ex-situ annealing in N-atmosphere and in-situ annealing in As-atmosphere, have been investigated. Samples have been analysed for the first time by cathodoluminescence (CL), being this technique a good method for getting direct information in a simple, fast and non-destructive way about compositional gradients. It has been supported by scanning transmission electron microscopy (STEM) and energy dispersive spectroscopy (EDS). Póster Ministerio de Economía, Industria y Competitividad (Project ENE2014-56069-C4-4-R) |
| Databáze: | OpenAIRE |
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