Structure and Surface Core-Level Shifts of GaAs Surfaces Prepared by Molecular-Beam Epitaxy

Autor:	Carsten Setzer, Jutta Platen, Karl Jacobi
Rok vydání:	2000
Předmět:	Core (optical fiber) Surface (mathematics) Crystallography X-ray photoelectron spectroscopy Chemistry Core level Synchrotron radiation Spectral shift Condensed Matter Physics Epitaxy Electronic Optical and Magnetic Materials Molecular beam epitaxy
Zdroj:	physica status solidi (b). 218:329-364
ISSN:	1521-3951 0370-1972
DOI:	10.1002/1521-3951(200004)218:2<329::aid-pssb329>3.0.co;2-i
Popis:	The GaAs(001), (110), (111)A, (111)B, (112)A, (112)B, (113) A, (113)B, (114)A and (114)B surfaces were prepared by molecular-beam epitaxy (MBE) and analyzed in situ by photoelectron spectroscopy of the Ga and As 3d core levels using synchrotron radiation. An overview of the results is given. For each surface also a brief summary of its structure is added. It is shown how surface core-level shifts (SCLS) act as a tool supporting the structure evaluation of these surfaces. The (001) and (110) surfaces are touched only briefly for comparison. The (111) surfaces are discussed more deeply. The high-index surfaces can be characterized as follows: (113)A exhibits a low-energy surface and a new type of reconstruction which consists of As-dimer zig-zag chains; (112)A and (112)B are heavily faceted and (114)A and (114)B are quite well understood in analogy to the (001) surface.
Databáze:	OpenAIRE
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