| AVS 54th International Symposium | |
| Surface Science | Thursday Sessions |
| Session SS1-ThM |
| Session: | Oxide Surface Structure II |
| Presenter: | S.T. King, University of Wisconsin - Milwaukee |
| Authors: | S.T. King, University of Wisconsin - Milwaukee S.S. Parihar, University of Wisconsin - Milwaukee K. Pradhan, University of Wisconsin - Milwaukee H.T. Johnson-Steigelman, University of Wisconsin - Milwaukee Z. Zhang, Argonne National Laboratory P. Zschack, Argonne National Laboratory P.F. Lyman, University of Wisconsin - Milwaukee |
| Correspondent: | Click to Email |
High energy polar-terminated metal oxide surfaces stabilize by a fascinating set of energy-lowering mechanisms.1 While MgO(111) and NiO(111) stabilize via a sequence of surface reconstructions, most studies have shown that the (0001) (Zn-polar) and (000-1) (O-polar) faces of ZnO remain unreconstructed. Surface stabilization has been attributed to incomplete charge transfer between the Zn- and O-polar surfaces resulting in metallic surface states.2 However, a recent He-atom scattering study of H-free ZnO (000-1) observed a (1x3) reconstruction, which de-reconstructs upon H exposure.3 We extend the knowledge of ZnO surface reconstructions by investigating a (√3x√3)R30° reconstruction on ZnO (000-1) by low energy electron diffraction, x-ray photoelectron spectroscopy, and surface x-ray diffraction. While this reconstruction has been observed on the (0001) face,4 to our knowledge this is the first reported observation on the O-polar surface. The implications of this reconstruction on understanding ZnO surface stabilization mechanisms will be discussed.
1 C. Noguera, J. Phys.: Condens. Matter 12, R367 (2000)
2 A. Wander et al., Phys. Rev. Lett. 86, 3811 (2001)
3 M. Kunat et al., Phys. Rev. B 66, 081402(R) (2002)
4 Y. Margoninski and R. E. Kirby, J. Phys. C 8, 1516 (1975)