Abstract
Hydrogen-terminated diamond films have been investigated by Contact Potential Difference Measurements (CPD or Kelvin force), Hall-effect experiments and theoretical calculations where the Schrodinger and Poisson equations have been solved to calculate the density of state (DOS) distribution at the surface of hydrogen terminated diamond. From CPD experiments we detect the Fermi-energy to be about 700 meV deep in the valence band. This is in agreement with results from numerical calculations, where Fermi-energies in the range 240 to 880 meV below the valence-band maximum at the surface are deduced. The calculations show that a two-dimensional (2D) density-of-state is present at the surface. Temperature dependent hole sheet-densities and mobilities are used to discuss the properties of the 2D-DOS. From this data we conclude that the 2D-DOS is distorted by disorder arising from non-perfect hydrogen termination of the surface, by surface roughness and/or by ionic molecules which are part of the adsorbate layer.
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