Phys. Rev. B 81, 233305 (2010) [4 pages]Direct evidence of metallicity at ZnO (0001̅ )-(1×1) surfaces from angle-resolved photoemission spectroscopyReceived 6 May 2010; revised 8 June 2010; published 22 June 2010 We have investigated the stability of O-polar ZnO (0001̅ )-(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. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.81.233305
DOI:
10.1103/PhysRevB.81.233305
PACS:
79.60.Bm, 73.20.At
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