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Search: WFRF:(Astrath N. G. C.) > (2006)

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1.
  • Astrath, N. G. C., et al. (author)
  • Band gap energy determination by photoacoustic spectroscopy under continuous light excitation
  • 2006
  • In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 89:23
  • Journal article (peer-reviewed)abstract
    • In this work the authors used the photoacoustic spectroscopy under continuous light excitation to determine the optical band gap of semiconductors. The experiments were performed in lead iodide PbI2 and hexagonal silicon carbide 4H-SiC samples. The nonradiative relaxation processes are discussed in terms of the generated signal. A mechanism to describe the signal increase/decrease under the continuous excitation is presented. The results showed that the method was useful to locate the band gap directly from the optical absorption spectra.
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2.
  • Astrath, N. G. C., et al. (author)
  • Photoacoustic spectroscopy to determine the optical properties of thin film 4H-SiC
  • 2006
  • In: Thin Solid Films. - : Elsevier BV. - 0040-6090 .- 1879-2731. ; 515:4, s. 2821-2823
  • Journal article (peer-reviewed)abstract
    • The optical transitions in a range of 1.5-5.2 eV of n-type 4H-SiC have been investigated experimentally by photoacoustic spectroscopy and theoretically by a full-potential linearized augmented plane wave method. From the absorption spectrum, we found the indirect optical bandgap at 3.2 eV and the direct transitions around 4.5 eV in very good agreement with what has been predicted by theoretical calculations.
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