Photoreflectance study of GaMnAs layers grown by MBE

I. Martínez-Velis, R. Contreras-Guerrero, J. S. Rojas-Ramírez, M. Ramírez-López, S. Gallardo-Hernández, Y. Kudriatsev, C. Vázquez-López, S. Jiménez-Sandoval, V. T. Rangel-Kuoppa, M. López-López

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Abstract

GaMnAs layers were grown by MBE on GaAs (0 0 1) substrates. The structural properties of the epilayers were studied by atomic force microscopy, secondary ion mass spectroscopy, high-resolution X-ray diffraction, and Raman spectroscopy. Photoreflectance spectra at room temperature exhibited FranzKeldysh oscillations; from an analysis of these oscillations we obtained the built-in internal electric field and the bandgap energy of the GaMnAs epilayers. We studied the variation of these parameters as a function of Mn in the epilayers. In addition the holes concentration in the samples was extracted from the bandgap narrowing value and compared with the carrier density obtained by the Hall measurements. © 2010 Elsevier B.V. All rights reserved.
Original languageAmerican English
Pages (from-to)344-347
Number of pages309
JournalJournal of Crystal Growth
DOIs
StatePublished - 15 May 2011
Externally publishedYes

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    Martínez-Velis, I., Contreras-Guerrero, R., Rojas-Ramírez, J. S., Ramírez-López, M., Gallardo-Hernández, S., Kudriatsev, Y., Vázquez-López, C., Jiménez-Sandoval, S., Rangel-Kuoppa, V. T., & López-López, M. (2011). Photoreflectance study of GaMnAs layers grown by MBE. Journal of Crystal Growth, 344-347. https://doi.org/10.1016/j.jcrysgro.2010.12.041