Infrared absorption and slow positron investigation of hydrogen plasma induced platelets in crystalline germanium

  • J. Lauwaert
  • J. De Baerdemaeker
  • C. Dauwe
  • P. Clauws


N-type germanium samples have been plasma treated which resulted in the formation of hydrogen clusters. It is demonstrated that additional annealing at 600 °C forms optical detectable blisters on the surface. To study those hydrogen clusters infrared absorption spectroscopy (IR) and slow positron defect profiling is used. Because the germanium hydrogen stretching mode band clearly consists of distinct bands it can be concluded that different types of clusters have been formed depending on hydrogenation temperature. Two different absorption bands have been observed at 1973 cm−1 and 2020 cm−1, which can be assigned to hydrogen clusters involving one and two hydrogen molecules respectively. Although the total hydrogen-germanium bond concentration is higher at lower hydrogenation temperature, it is shown that in terms of percentage more clusters including hydrogen molecules are created at higher hydrogenation temperatures. Slow positron profiling has shown that those defects form up to 300 nm beyond the treated surface.


Plasma Treatment Additional Annealing Hydrogenation Temperature Slow Positron Platelet Structure 
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This work was supported by the Fonds voor Wetenschappelijk Onderzoek (F.W.O.) under project no G.0344.03.


  1. 1.
    M. Bruel, Electron. Lett. 31, 1201 (1995)CrossRefGoogle Scholar
  2. 2.
    M. Hiller, E.V. Lavrov, J. Weber, Phys. Rev. B 71, 045208 (2005)CrossRefGoogle Scholar
  3. 3.
    J. Lauwaert, M.L. David, M.F. Beaufort, E. Simoen, D. Depla, P. Clauws, Mater. Sci. Semicond. Proc. (to be published)Google Scholar
  4. 4.
    P. Deak, C.R. Ortiz, L.C. Snyder, J.W. Corbett, Physica B 17, 223 (1991)CrossRefGoogle Scholar
  5. 5.
    B. Hourahine, R. Jones, P.R. Briddon, Physica B 376–377, 105 (2006)CrossRefGoogle Scholar
  6. 6.
    J. De Baerdemaeker, C. Dauwe, Appl. Surf. Sci. 194, 52 (2002)CrossRefGoogle Scholar
  7. 7.
    S. Muto, S. Takeda, M. Hirata, Mat. Sci. Forum 143–147, 897 (1994)CrossRefGoogle Scholar
  8. 8.
    A. van Veen, H. Schut, J. de Vries, R.A. Hakvoort, M.R. Ijpma, in Positron Beams for Solids and Surfaces, ed. by P.J. Schultz, G.R. Massoumi, P.J. Simpson, AIP Conf. Proc. No. 218 (AIP, New York, 1990), p. 171Google Scholar
  9. 9.
    B. Nielsen, O.W. Holland, T.C. Leung, K.G. Lynn, J. Appl. Phys. 74, 1636 (1993)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • J. Lauwaert
    • 1
  • J. De Baerdemaeker
    • 2
  • C. Dauwe
    • 2
  • P. Clauws
    • 1
  1. 1.Department of Solid State SciencesGhent UniversityGentBelgium
  2. 2.Department of Subatomic and Radiation PhysicsGhent UniversityGentBelgium

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