Abstract
The electronic properties of hydrogen and oxygen terminated surfaces of polycrystalline diamond films are investigated in the dark and under illumination by temperature dependent surface conductivity, field dependence of photocurrent and spectrally resolved photoelectron yield measurements. The as grown characteristics, as well as the observed changes induced by thermal annealing and sulphochromic treatment are interpreted in terms of surface band bending controlled by H-termination and by the presence of adsorbates, whose extention can be further modulated by illumination and by the laterally applied bias.
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