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Träfflista för sökning "WFRF:(Meczynska H.) srt2:(2001)"

Sökning: WFRF:(Meczynska H.) > (2001)

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1.
  • Bukaluk, A., et al. (författare)
  • Auger electron spectroscopy, ellipsometry and photoluminescence investigations of Zn1-XBeXSe alloys
  • 2001
  • Ingår i: Applied Surface Science. - 0169-4332 .- 1873-5584. ; 175-176, s. 531-537
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, properties of the Zn1-XBeXSe crystals grown from the melt by the high-pressure Bridgman method are reported. Spectroscopic ellipsometry has been used for determination of the complex dielectric function of Zn1-XBeXSe. On the basis of the photon energy dependence of the dielectric function, the energy gaps of alloys containing different beryllium concentrations have been evaluated. Measurements of the photoluminescence (PL) spectra allowed to find the excitonic gap in the investigated alloys. Auger electron spectroscopy (AES) with simultaneous argon ion sputtering has been used for determination of surface composition. AES investigations allowed to make predictions concerning distribution of particular elements in the samples. © 2001 Elsevier Science B.V.
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2.
  • Wronkowska, A.A., et al. (författare)
  • Characterisation of Cd1-xMgxSe solid solutions by spectroscopic ellipsometry
  • 2001
  • Ingår i: Vacuum. - 0042-207X .- 1879-2715. ; 63:1-2, s. 233-239
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Optical properties of bulk Cd1-xMgxSe mixed crystals, grown from a CdSe, Mg, and Se melt by the Bridgman method, are presented. The alloys have a wurtzite type structure in the investigated range of composition, i.e. for 0 = x = 0.4. Measurements of the complex pseudo-dielectric function, = + ie2(?)>, were performed at room temperature in the photon energy range of 1.25-4.5 eV, using a computer-controlled variable angle of incidence ellipsometer. The spectral dependence of the effective refractive index and the absorption coefficient were also derived. The structure observed in the dielectric functions, attributed to the interband transitions E0, E0 + ?0 and E1, have been analysed by fitting the and d2/d?2 spectra to the damped harmonic oscillator and critical-point line shapes, respectively. For all critical points, the energy increases with increasing Mg concentration. The ellipsometric results of a fundamental band-gap shift due to Mg content are compared with the rate of increase of the excitonic energy, derived from photoluminescence spectra. © 2001 Elsevier Science Ltd.
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