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Characterisation of Cd1-xMgxSe solid solutions by spectroscopic ellipsometry
Institute of Mathematics and Physics, University of Technology and Agriculture, ul. Kaliskiego 7, 85-796 Bydgoszcz, Poland.
Institute of Mathematics and Physics, University of Technology and Agriculture, ul. Kaliskiego 7, 85-796 Bydgoszcz, Poland.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Optics .ORCID iD: 0000-0001-9229-2028
Institute of Physics, Nicholas Copernicus University, Torun, Poland.
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2001 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 63, no 1-2, 233-239 p.Conference paper, Published paper (Other academic)
Abstract [en]

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.

Place, publisher, year, edition, pages
2001. Vol. 63, no 1-2, 233-239 p.
Keyword [en]
Dielectric function, II-VI semiconductors, Photoluminescence, Spectroscopic ellipsometry
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47323DOI: 10.1016/S0042-207X(01)00197-XOAI: oai:DiVA.org:liu-47323DiVA: diva2:268219
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Arwin, Hans

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