Publications [#63737] of April S. Brown

Papers Published

1. Losurdo, M. and Giuva, D. and Giangregorio, M.M. and Bruno, G. and Brown, A.S., Spectroscopic ellipsometry characterization of interface reactivity in GaAs-based superlattices, Thin Solid Films, vol. 455-456 (2004), pp. 457 - 461, Vienna, Austria [286]
   (last updated on 2007/04/14)

   Abstract:
   Pseudodielectric function spectra of GaAs/GaSb_1-yAs_y, GaSb/GaAs_ySb_1-y and GaAs/GaP_yAs_1-y superlattices have been measured by spectroscopic ellipsometry in the 0.75-5.5 eV photon energy range. The analysis of the E₁ interband critical point and modeling of spectra has been carried out to investigate the chemistry of the anion exchange reaction and abruptness of interface composition in the superlattices. It has been found that a ternary compound GaP_yAs _1-y forms in the case of the P-for-As anion exchange reaction. In the case of As-for-Sb anion exchange reaction for (GaSb/GaAs_ySb _1-y)₂₀ SLs, SE data show that this anion exchange results in the formation not only of a ternary alloy GaAs_ySb_1-y, but also in the formation of isoelectronic compounds AsSb_x that segregate at the GaSb/GaAs interface. In the case of Sb-for-As anion exchange for (GaAs/GaSbyAs_1-y)₂₀ SLs, Sb segregates at the GaAs surface. © 2003 Elsevier B.V. All rights reserved.

   Keywords:
   Superlattices;Ion exchange;Negative ions;Surface treatment;Ternary systems;Microstructure;Ellipsometry;Spectroscopic analysis;Molecular beam epitaxy;