Direct evidence of metallicity at ZnO (000 1̄ ) - (1×1 ) surfaces from angle-resolved photoemission spectroscopy

L. F.J. Piper; A. R.H. Preston; A. Fedorov; S. W. Cho; A. Demasi; K. E. Smith

doi:10.1103/PhysRevB.81.233305

Direct evidence of metallicity at ZnO (000 1̄ ) - (1×1 ) surfaces from angle-resolved photoemission spectroscopy

L. F.J. Piper, A. R.H. Preston, A. Fedorov, S. W. Cho, A. Demasi, K. E. Smith

Physics

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45 Citations (Scopus)

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	https://doi.org/10.1103/PhysRevB.81.233305
Publication status	Published - 2010 Jun 22

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.81.233305

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title = "Direct evidence of metallicity at ZnO (000 {\=1} ) - (1×1 ) surfaces from angle-resolved photoemission spectroscopy",

abstract = "We have investigated the stability of O-polar ZnO (000 {\=1}) - (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.",

author = "Piper, {L. F.J.} and Preston, {A. R.H.} and A. Fedorov and Cho, {S. W.} and A. Demasi and Smith, {K. E.}",

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doi = "10.1103/PhysRevB.81.233305",

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Direct evidence of metallicity at ZnO (000 1̄ ) - (1×1 ) surfaces from angle-resolved photoemission spectroscopy. / Piper, L. F.J.; Preston, A. R.H.; Fedorov, A.; Cho, S. W.; Demasi, A.; Smith, K. E.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 23, 233305, 22.06.2010.

Research output: Contribution to journal › Article › peer-review

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AU - Piper, L. F.J.

AU - Preston, A. R.H.

AU - Fedorov, A.

AU - Cho, S. W.

AU - Demasi, A.

AU - Smith, K. E.

PY - 2010/6/22

Y1 - 2010/6/22

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AB - 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.

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Direct evidence of metallicity at ZnO (000 1̄ ) - (1×1 ) surfaces from angle-resolved photoemission spectroscopy

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