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Photoluminescence of InNAs alloys: S-shaped temperature dependence and conduction-band nonparabolicity
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Merrick, M., Cripps, S. A., Murdin, B. N., Hosea, T. J. C., Veal, T. D. (Tim D.), McConville, C. F. (Chris F.) and Hopkinson, M.. (2007) Photoluminescence of InNAs alloys: S-shaped temperature dependence and conduction-band nonparabolicity. Physical Review B, Vol.76 (No.7). Article: 075209. ISSN 1098-0121
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Official URL: http://dx.doi.org/10.1103/PhysRevB.76.075209
Abstract
Photoluminescence (PL) has been used as a means of unambiguously observing band gap reduction in InNAs epilayers grown by molecular beam epitaxy. The observed redshift in room temperature emission as a function of nitrogen concentration is in agreement with the predictions of the band anticrossing (BAC) model, as implemented with model parameters derived from tight-binding calculations. The temperature dependence of the emission from certain samples exhibits a signature non-Varshni-like behavior indicative of electron trapping in nitrogen-related localized states below the conduction-band edge, as predicted by the linear combination of isolated nitrogen states (LCINS) model. This non-Varshni-like behavior tends to grow more pronounced with increasing nitrogen content, but for the highest nitrogen concentration studied, the more familiar Varshni-like behavior is recovered. Although unexpected, this observation is found to be consistent with the BAC and LCINS models. With consideration given to the effects of conduction-band nonparabolicity on the emission line shapes, the BAC model parameters extracted from the measured PL transition energies are found to be in excellent agreement with the predictions of the aforementioned tight-binding calculations.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | Physical Review B |
| Publisher: | American Physical Society |
| ISSN: | 1098-0121 |
| Date: | August 2007 |
| Volume: | Vol.76 |
| Number: | No.7 |
| Number of Pages: | 9 |
| Page Range: | Article: 075209 |
| Identification Number: | 10.1103/PhysRevB.76.075209 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| URI: | http://wrap.warwick.ac.uk/id/eprint/31501 |
Data sourced from Thomson Reuters' Web of Knowledge
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