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Electron depletion at InAs free surfaces: Doping-induced acceptorlike gap states
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Piper, L. F. J., Veal, T. D. (Tim D.), Lowe, M. J. and McConville, C. F.. (2006) Electron depletion at InAs free surfaces: Doping-induced acceptorlike gap states. Physical Review B (Condensed Matter and Materials Physics), Vol.73 (No.19). Article: 195321. ISSN 1098-0121
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Official URL: http://dx.doi.org/10.1103/PhysRevB.73.195321
Abstract
For almost all n-type zinc-blende III-V semiconductor free surfaces a depletion layer is observed. InAs is an exception, since n-type InAs free surfaces exhibit electron accumulation, due to donorlike surface states which pin the Fermi level far above the conduction band minimum. High-resolution electron-energy-loss spectroscopy (HREELS) has been used to investigate the free surfaces of slightly degenerate (n similar to 2x10(17) cm(-3)) and highly degenerate (n similar to 5x10(18) cm(-3)) InAs. From HREEL studies of these InAs samples, an electron accumulation and depletion layer were observed, respectively. The Fermi-level pinning mechanism at free surfaces is discussed in terms of the position of the bulk Fermi level with respect to the branch-point energy (E-B). Depending on the location of the bulk Fermi level, amphoteric defects are incorporated into the surface, which if ionized facilitate the band bending that results in the surface Fermi level becoming pinned close to E-B. Occupied cation-on-anion antisite defects and unoccupied anion-on-cation antisite defects at the surface are considered to be the ionized surface states responsible for the depletion and accumulation layer profiles, respectively.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) |
| Publisher: | American Physical Society |
| ISSN: | 1098-0121 |
| Date: | May 2006 |
| Volume: | Vol.73 |
| Number: | No.19 |
| Number of Pages: | 7 |
| Page Range: | Article: 195321 |
| Identification Number: | 10.1103/PhysRevB.73.195321 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| URI: | http://wrap.warwick.ac.uk/id/eprint/33464 |
Data sourced from Thomson Reuters' Web of Knowledge
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