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Ellipsometric spectroscopy of the ZnO nonpolar\((1\bar 100)\) surface

Abstract

Ellipsometric spectroscopy has been performed on nonpolar ZnO\((1\bar 100)\) surfaces in the spectral range 1.5 eV<ħω<4.0 eV. Absolute measurements with two different crystal orientations in air allow the determination of the optical constantsn ,k andn ,k for light polarized parallel and perpendicular to thec-axis. The ellipsometric angles Δ and ψ are changed remarkably on ultrahigh vacuum cleaved surfaces near the band gap energy of ∼3.4eV when oxygen or atomic hydrogen is adsorbed or when the crystal is annealed. This observation is interpreted in terms of a field effect on the optical constants in the space charge layer.

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Matz, R., Lüth, H. Ellipsometric spectroscopy of the ZnO nonpolar\((1\bar 100)\) surface. Appl. Phys. 18, 123–130 (1979). https://doi.org/10.1007/BF00934406

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PACS

  • 82.65
  • 42.80
  • 07