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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5318-5324 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Radiative and compositional properties of spark-processed silicon are studied by photoluminescence and x-ray photoelectron spectroscopy measurements. Spark processing of silicon is performed in different atmospheres composed of nitrogen and oxygen. As a result of the process, room-temperature radiative transitions occur at 2.35 eV and vary in intensity over five orders of magnitude depending on the N2/O2 ratio. After processing in pure nitrogen or pure oxygen, however, the green photoluminescence (PL) is wiped out and weak blue (2.7 eV) or orange (1.9 eV) PL bands, respectively, are discernable. The temperature-dependent features of the 2.35 eV emission are characterized by an intensity increase in conjunction with a red shift of the peak position at lowered temperatures. A cross-sectional study reveals that the green PL is mainly generated in a near-surface layer having a chemical composition close to SiO2 and a nitrogen concentration below 1 at. %. Nearly no PL was observed from a deeper SiO2 layer enriched by silicon clusters and with an increased density of nitrogen (up to 7 at. %). The findings do not support a quantum-dot-related PL mechanism in spark-processed silicon. It is proposed that nitrogen additions reduce the density of nonradiative centers introduced by silicon dangling bonds. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1218-1218 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Four different silica modifications - thermally grown SiO2, quartz glass, silicalite and silica gel - have been investigated by XPS. Binding energies for Si 2p, Si 2s and O 1s were obtained by employing different methods of static charge referencing. In any case, a C 1s references was used as usual. In another experiment, deposited 20 nm gold particles were used to provide an Au 4f7/2 binding energy (BE) reference. The two different charging correction procedures result in essentially identical BE data. Furthermore, the results confirm that different modifications of silica give substantially the same relevant BEs in XPS. Though the investigated samples are characterized by quite different concentrations of silanol groups, no significant effect on the measured BEs has been found. On the other hand, the analysed silica samples are observed with quite different Si 2p and O 1s peaks widths. This effect is discussed in terms of differential charging.A rather extensive compilation of XPS literature BEs of silica modifications is given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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