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Title: X-ray and synchrotron studies of porous silicon

The results of comprehensive studies of layers of porous silicon of different conductivity types, grown by anodizing standard Si(111) substrates in an electrolyte based on fluoric acid and ethanol with the addition of 5% of iodine and kept in air for a long time, are discussed. Measurements are performed by scanning electron microscopy, high-resolution X-ray diffraction, and ultrasoft X-ray spectroscopy using synchrotron radiation. The structural parameters of the layers (thickness, strain, and porosity) and atomic and chemical composition of the porous-silicon surface are determined. It is found that an oxide layer 1.5-2.3-nm thick is formed on the surface of the silicon skeleton. The near-edge fine structure of the Si 2p absorption spectrum of this layer corresponds to the fine structure of the 2p spectrum of well coordinated SiO{sub 2}. In this case, the fine structure in the Si 2p-edge absorption region of the silicon skeleton is identical to that of the 2p absorption spectrum of crystalline silicon.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1]
  1. Russian Academy of Sciences, Komi Scientific Center, Ural Branch (Russian Federation)
  2. Russian Academy of Sciences, Physical-Technological Institute (Russian Federation)
  3. Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
  4. Komi State Pedagogical Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22210581
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 47; Journal Issue: 8; Other Information: Copyright (c) 2013 Pleiades Publishing, Ltd.; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ABSORPTION SPECTRA; ANODIZATION; CHEMICAL COMPOSITION; ELECTROLYTES; FINE STRUCTURE; LAYERS; POROUS MATERIALS; SCANNING ELECTRON MICROSCOPY; SILICA; SILICON OXIDES; SKELETON; SPECTROSCOPY; STRAINS; SUBSTRATES; SURFACES; SYNCHROTRON RADIATION; THICKNESS; X RADIATION; X-RAY DIFFRACTION