Abstract
Surface photovoltage spectroscopy and thermally stimulated contact potential difference measurements are reported for real ZnS surfaces. The measurements allow the determination of the surface states existing via two different processes, i.e. optical excitation of carriers into and from the existing surface states. Changing the surface condition by annealing at 350°C produces different electronic features which are attributed to different bondings at surface vacancy sites. Furthermore, annealing changes the polarity of the surface photovoltage.
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