Observation of a (3x3)R30 Reconstruction on O-Polar ZnO Surfaces
Abstract
Low energy electron diffraction revealed a previously unreported (3x3)R30 reconstruction on clean, O-polar ZnO surfaces after in-situ preparation under conditions with an extremely low H background or after ex-situ tube-furnace annealing [1]. It has been proposed that unreconstructed, H-free, O-polar ZnO surfaces cannot be produced [2]. As the sample is prepared from the as-received surface, to a clean (1x1), and finally to the clean (3x3)R30 reconstruction, x-ray photoelectron spectroscopy shows decreasing intensity of the hydroxyl shoulder (located to the high-binding-energy side of the O1s peak). This reconstruction is stable against H2, N2, and air, although its formation is suppressed when preparation occurs under an intentional H2 background. A structural investigation of the reconstruction with LEED-IV is under way. References: [1] S.T. King et al., Surf. Sci. 604, L131 (2008) [2] C. W"oll, Prog. Surf. Sci. 82, 55 (2007)
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2009
- Bibcode:
- 2009APS..MARX12005K