Abstract
We have investigated the stability of O-polar ZnO (000 1̄) - (1×1) surfaces with photoemission spectroscopy and low-energy electron diffraction. We present direct evidence of quasi-two-dimensional electron gas (2DEG) formation (N2D ≤2× 1013 cm-2) at the O-face from our angle-resolved photoemission spectroscopy studies. These findings are discussed in terms of hydrogenation of the O-face by chemisorptions process and the energetic location of the charge-neutrality level of ZnO. Our results reveal insight into the role of hydrogen in forming the quasi-2DEG and stabilizing the O-polar nonreconstructed surface.
| Original language | English |
|---|---|
| Article number | 233305 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 81 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 2010 Jun 22 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Piper, L. F. J., Preston, A. R. H., Fedorov, A., Cho, S. W., Demasi, A., & Smith, K. E. (2010). Direct evidence of metallicity at ZnO (000 1̄ ) - (1×1 ) surfaces from angle-resolved photoemission spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 81(23), [233305]. https://doi.org/10.1103/PhysRevB.81.233305