ZnO(0001) surfaces probed by scanning tunneling spectroscopy: Evidence for an inhomogeneous electronic structure

J. Dumont, B. Hackens, S. Faniel, P. O. Mouthuy, R. Sporken, S. Melinte

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The stability of the polar Zn-terminated ZnO surface is probed by low-temperature scanning tunneling microscopy and scanning tunneling spectroscopy (STS). Surface states in the bandgap of ZnO are evidenced by STS and their presence is correlated with the local surface corrugation. Very defective surface regions are characterized by a bulk electronic structure showing a wide bandgap while nanometer-scale defect free regions exhibit a narrower bandgap and surface states. We also image atomically resolved (√3 × √3) R30° reconstructions on the defect-free areas.

    Original languageEnglish
    Article number132102
    JournalAppl. Phys. Lett.
    Volume95
    Issue number13
    DOIs
    Publication statusPublished - 2009

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