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Variation of band bending at the surface of Mg-doped InGaN: evidence of p-type conductivity across the composition range
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King, P. D. C., Veal, T. D. (Tim D.), Jefferson, P. H., McConville, C. F. (Chris F.), Lu, Hai and Schaff, W. J. (2007) Variation of band bending at the surface of Mg-doped InGaN: evidence of p-type conductivity across the composition range. Physical Review B, 75 (11). Article: 115312. doi:10.1103/PhysRevB.75.115312 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.75.115312
Abstract
The variation of band bending as a function of composition at oxidized (0001) surfaces of Mg-doped InxGa1-xN is investigated using x-ray photoelectron spectroscopy. Distinctly different trends in barrier height are seen for the Mg-doped compared to undoped alloys, which is explained in terms of Fermi-level pinning at the surface and virtual gap states. Solutions of Poisson's equation within the modified Thomas-Fermi approximation are used to model the band bending and corresponding variation of carrier concentration with depth below the surface. A transition from a surface inversion layer for In-rich alloys to a surface hole depletion layer for Ga-rich alloys occurs at x approximate to 0.49. The trend in barrier height, calculated space-charge profiles, and difference of barrier height for undoped and Mg-doped InN indicate that Mg doping induces bulk p-type conductivity across the entire composition range.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review B | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | March 2007 | ||||
Dates: |
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Volume: | 75 | ||||
Number: | 11 | ||||
Number of Pages: | 7 | ||||
Page Range: | Article: 115312 | ||||
DOI: | 10.1103/PhysRevB.75.115312 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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