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Hard x-ray photoelectron spectroscopy as a probe of the intrinsic electronic properties of CdO
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Mudd, James J., Lee, Tien-Lin, Muñoz-Sanjosé, V., Zúñiga-Pérez, J., Hesp, D., Kahk, J. M., Payne, D. J., Egdell, R. G. and McConville, C. F. (Chris F.) (2014) Hard x-ray photoelectron spectroscopy as a probe of the intrinsic electronic properties of CdO. Physical Review B (Condensed Matter and Materials Physics), Volume 89 (Number 3). Article number 035203 . doi:10.1103/PhysRevB.89.035203 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.89.035203
Abstract
Hard x-ray photoelectron spectroscopy (HAXPES) is used to investigate the intrinsic electronic properties of single crystal epitaxial CdO(100) thin films grown by metal organic vapor phase epitaxy (MOVPE). The reduced surface sensitivity of the HAXPES technique relaxes stringent surface preparation requirements, thereby allowing the measurement of as-grown samples with intrinsically higher carrier concentration (n=2.4×1020cm−3). High-resolution HAXPES spectra of the valence band and core levels measured at photon energy of 6054 eV are presented. The effects of conduction band filling and band gap renormalization are discussed to explain the observed binding energy shifts. The measured bandwidth of the partially occupied conduction band feature indicates that a plasmon contribution may be present at higher carrier concentrations. The Cd 3d5/2 and O 1s core-level line shapes are found to exhibit an increased asymmetry with increased carrier concentration, interpreted as evidence for final state screening effects from the carriers in the conduction band. Alternatively the core-level line shape is interpreted as arising from strong conduction electron plasmon satellites. The nature of these two competing models to describe core-level line shapes in metallic oxides is explored.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | X-ray photoelectron spectroscopy, Thin films -- Electric properties, Cadmium compounds, Metal oxide semiconductors | ||||||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||||
| Publisher: | American Physical Society | ||||||||
| ISSN: | 1098-0121 | ||||||||
| Official Date: | 15 January 2014 | ||||||||
| Dates: |
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| Volume: | Volume 89 | ||||||||
| Number: | Number 3 | ||||||||
| Article Number: | Article number 035203 | ||||||||
| DOI: | 10.1103/PhysRevB.89.035203 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 27 December 2015 | ||||||||
| Date of first compliant Open Access: | 27 December 2015 | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Spain, Valencia (Spain : Region) | ||||||||
| Grant number: | TEC2011-28076-C02-02 (Spain), Prometeo/2011-035 (Valencia), ISIC/2012/008 (Valencia) |
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