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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2010 Jun 22|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics