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Electronic and optical properties of amorphous GaSe thin films

  • M. C. Siqueira
  • K. D. Machado
  • J. P. M. Serbena
  • I. A. Hümmelgen
  • S. F. Stolf
  • C. G. G. de Azevedo
  • J. H. D. da Silva
Article

Abstract

The eletronic and optical properties of amorphous GaSe thin films produced by vacuum evaporation were investigated using X-ray photoemission spectroscopy (XPS) and transmittance spectroscopy techniques. XPS measurements allowed the determination of the valence band energy and showed the chemical bonding and the charge transfer between Se and Ga atoms. Transmittance measurements allowed the determination of the optical gap, refractive index and extinction coefficient in the low and high absorption regions. Using the Wemple and DiDomenico single oscillator model we also found the oscillator and the dispersive energies. From the valence band and optical gap energies, the conduction band was found and an energy level diagram for f-GaSe is proposed.

Keywords

Energy Level Diagram High Work Function High Absorption Region Valence Band Energy Static Refractive Index 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We would like to thank the Brazilian agencies CNPq, CAPES and FAPESP for financial support, and LNLS for financial and technical supports (proposal SXS-10976).

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • M. C. Siqueira
    • 1
  • K. D. Machado
    • 2
  • J. P. M. Serbena
    • 2
  • I. A. Hümmelgen
    • 2
  • S. F. Stolf
    • 3
  • C. G. G. de Azevedo
    • 4
  • J. H. D. da Silva
    • 4
  1. 1.Faculdade de Tecnologia SENAI-CICCuritibaBrazil
  2. 2.Departamento de Física, Centro PolitécnicoUniversidade Federal do ParanáCuritibaBrazil
  3. 3.Centro de Engenharia e Ciências ExatasUNIOESTEToledoBrazil
  4. 4.Departamento de FísicaUniversidade Estadual PaulistaBauruBrazil

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