Raman and FTIR spectroscopy of GaSb and AlxGa1-X alloys with nanometric thickness grown at low temperatures by liquid phase epitaxy

P. Prieto-Cortés, M. Palafox-Plata, V. L. Gayou, R. Delgado-Macuil, A. G. Rodríguez, B. Salazar-Hernández, M. Rojas-López

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

GaSb and AlxGa1-xSb thin layers were grown on (001) oriented GaSb substrates by liquid phase epitaxy technique at low temperatures. Until now, there are no previous reports on the growth of this alloy at temperatures lower than 400 °C. The layers were grown from 400 to 250 °C for the ternary layers, and at 200°C for the binary layers using a supercooling process of 10 °C and a cooling rate of 0.5 °C/min. In addition to that, ternary AlxGa1-xSb layers were prepared at 250 °C for several contact times 1, 5, 10, 40 and 80 minutes, and something similar was done for binary GaSb layers, with contact times of 7.5, 15, 30, 60 and 120 minutes. Infrared reflectance results show the presence of single mode spectra for GaSb layers and two mode spectra for Al xGa1-xSb layers corroborating the growth of the alloys, whereas Raman scattering results show also the single and two mode behaviors of the GaSb and AlxGa1-xSb layers respectively. In ternary layers Raman bands, such as LO-GaSb like mode undergo a shift to low energies with growth temperature and with contact time. The results suggest a greater incorporation of Al atoms in the layer for smaller contact times that with greater contact times, and also for high temperatures that with low temperatures.

Original languageEnglish
Title of host publicationRIAO/OPTILAS 2007 - 6th Ibero-American Conference on Optics (RIAO) and the 9th Latin-American Meeting on Optics, Lasers and Applications (OPTILAS)
Pages1258-1261
Number of pages4
DOIs
StatePublished - 2008
Event6th Ibero-American Conference onOptics and 9th Latin-American Meeting on Optics, Lasers and Applications, RIAO/OPTILAS 2007 - Campinas, Sao Paulo, Brazil
Duration: 21 Oct 200726 Oct 2007

Publication series

NameAIP Conference Proceedings
Volume992
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference6th Ibero-American Conference onOptics and 9th Latin-American Meeting on Optics, Lasers and Applications, RIAO/OPTILAS 2007
Country/TerritoryBrazil
CityCampinas, Sao Paulo
Period21/10/0726/10/07

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