Ordered Hg0.8Cd0.2Te (111)A and (111)B surfaces: Preparation by annealing in Hg vapor and characterization by low‐energy electron diffraction, Auger electron spectroscopy, and electron energy‐loss spectroscopy

Autor:	John Y. Gui, Donald A. Stern, Arthur T. Hubbard
Rok vydání:	1992
Předmět:	Auger electron spectroscopy Argon Ion beam Low-energy electron diffraction Chemistry Electron energy loss spectroscopy Analytical chemistry chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Isotropic etching Surfaces Coatings and Films Electron diffraction Spectroscopy
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 10:122-130
ISSN:	1520-8559 0734-2101
DOI:	10.1116/1.578124
Popis:	Reported here are studies in which an oriented single‐crystal, Hg0.8Cd0.2Te (111), was etched with methanolic bromine solution, ion bombarded with Ar+, and annealed in Hg vapor. Both parallel faces of the crystal, the metal‐terminated (111)A surface and the Te‐terminated (111)B surface, were characterized after each of the above stages of preparation by Auger electron spectroscopy (AES), electron energy‐loss spectroscopy (EELS) and low‐energy electron diffraction (LEED). After polishing in air the (111)A and (111)B surfaces were found to be contaminated with C and S‐containing substances, and deficient in Cd; the LEED patterns were diffuse. EELS spectra showed a broad C–H stretching band near 2980 cm−1 and another broad band centered at 1300 cm−1 due to C–H bending and C–C stretching of surface hydrocarbons. Etching with bromine solution in air removed S‐containing surface contaminants, without significantly changing the LEED and EELS results. Argon ion‐bombardment removed the C contamination and increase...
Databáze:	OpenAIRE
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