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Abstract: The optical properties of p-type, n-type and nominally undoped (AlxGa1-x)yIn1-yP layers have been determined in a wide spectral range. The layers under study have been chosen with compositions and dopant concentrations which make them interesting for their use in III-V multijunction solar cells. The layers have been measured by variable angle spectroscopic ellipsometry and, irrespective of composition and doping, their optical response has been modelled using the same model dielectric function consisting of two asymmetric Tauc-Lorentz oscillators and a 3D-M0 Adachi term. The results show that transition energy values change with layer composition, whilst for layers of the same material (i.e. GaInP or AlInP), the band-gap transition energy E0 shows a strong dependence on the order parameter. The refractive indexes and extinction coefficients deduced from the ellipsometric data have been used to fit reflectance measurements for the same layers and an excellent agreement has been achieved, thus validating the model dielectric function proposed for this kind of materials.
Fuente: Solar Energy Materials & Solar Cells, 2018, 174, 388-396
Editorial: Elsevier
Fecha de publicación: 01/01/2018
Nº de páginas: 9
Tipo de publicación: Artículo de Revista
DOI: 10.1016/j.solmat.2017.09.028
ISSN: 1879-3398,0927-0248
Proyecto español: TEC2014-54260-C3-1-P
Url de la publicación: https://doi.org/10.1016/j.solmat.2017.09.028
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OCHOA MARTÍNEZ, EFRAÍN
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MARIO OCHOA GOMEZ
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REY-STOLLE PRADO, IGNACIO
ALGORA DEL VALLE, CARLOS
BASA, PETER
KRONOME, GERGELY
GABÁS PÉREZ, MARÍA MERCEDES
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