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  • 1
    Electronic Resource
    Electronic Resource
    Dielectric function spectra of GaN, AlGaN, and GaN/AlGaN heterostructures (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 2779-2785 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pseudodielectric function spectra 〈ε〉 of wurtzite GaN, AlGaN, and GaN/AlGaN heterostructures were determined for photon energies ranging from 2 to 5 eV, using variable angle spectroscopic ellipsometry (SE). Samples were grown by low-pressure metalorganic chemical vapor deposition on c-plane sapphire substrates. The experimental 〈ε〉 spectra were analyzed using a multilayer approach, describing the dielectric functions of the individual layers by a parametric oscillator model. In this way, parametric dielectric function spectra of GaN and AlxGa1−xN (x≤0.16) were derived, as well as the composition dependence of the AlxGa1−xN band gap energy. The SE band gap data were found to be consistent with a bowing parameter close to 1 eV. Finally, the GaN and AlxGa1−xN parametric dielectric functions were used to quantitatively analyze the pseudodielectric function spectrum of GaN/AlGaN modulation doped field effect transistor structures, demonstrating the potential of SE in combination with a multilayer parametric dielectric function model for nondestructive ex situ control of GaN/AlGaN device structures. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1342022
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  • 2
    Electronic Resource
    Electronic Resource
    Partial core hole screening in the Cu L 3 edge (2001)
    Springer
    The European physical journal 21 (2001), S. 363-367 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.15.Ap Basis sets (plane-wave, APS, LCAO, etc.) and related methodology (scattering methods, ASA, linearized methods) – 71.20.-b Electron density of states and band structure of crystalline solids – 71.20.Be Transition metals and alloys – 78.70.Dm X-ray absorption spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The fine structure of the copper L3 edge in fcc Cu was simulated using a full potential linearised augmented plane wave method (WIEN97). The computations were based on a single cell-model by introducing a partial core hole and on a 2×2×1 super-cell-model with one full core hole. No difference between the single cell with a full core hole and the 16 atoms supercell with one core hole could be observed. Comparison with experimental spectra of two Cu specimens prepared by different methods showed that after removing the Cu2O contribution to the spectrum the best fit was obtained for half a core hole. This shows that the core hole in Cu metal is only partially screened by the valence electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170179
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