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ISSN - 00396028, Surface Science, 2004, vol. 570, p. 237-244

Well-ordered (100) InAs surfaces using wet chemical treatments

Tereshchenko O. E., Placidi E., Paget D., Chiaradia P., Balzarotti A.

Atomic ordering of HCl-isopropanol (HCl-iPA) treated and vacuum annealed (100) InAs surfaces was studied by scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and reflectance anisotropy spectroscopy (RAS). On the as-treated surface, a diffused (1×1) pattern is observed, which successively evolves to the β2(2×4)/c(2×8) and (4×2)/c(8×2) ones after annealing to 330°C and 410°C, respectively. At the intermediate temperature of 370°C, an α2(2×4)/(4×2) mixed reconstruction is observed. Reflectance anisotropy spectra are compared with those of the corresponding reconstructions observed after As-decapping and found to be quite similar. Therefore we conclude that high-quality (100) InAs surfaces can be obtained by wet chemical treatment in an easy, inexpensive and practical way. © 2004 Elsevier B.V. All rights reserved.