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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2411.12896 |
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| _version_ | 1866910705590992896 |
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| author | Forbus, Jason Wickramaratne, Darshana Lyons, John L. Zvanut, M. E. |
| author_facet | Forbus, Jason Wickramaratne, Darshana Lyons, John L. Zvanut, M. E. |
| contents | We present photo-electron paramagnetic resonance (EPR) measurements and first-principles calculations that indicate germanium (Ge) is a DX-center in AlGaN. Our photo-EPR measurements on Ge-doped AlGaN samples show no EPR spectra in the dark, while persistent EPR spectra is observed upon photoexcitation with photon energies greater than ~1.3 eV. Thermally annealing the samples decreased the EPR signal, with the critical temperature to quench the EPR signal being larger in the lower Al-content sample. Using detailed first-principles calculations of Ge in AlGaN, we show all of these observations can be explained by accounting for the DX configuration of Ge in AlGaN. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_12896 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nonradiative quenching of EPR signals in germanium-doped AlGaN: evidence for DX-center formation Forbus, Jason Wickramaratne, Darshana Lyons, John L. Zvanut, M. E. Materials Science We present photo-electron paramagnetic resonance (EPR) measurements and first-principles calculations that indicate germanium (Ge) is a DX-center in AlGaN. Our photo-EPR measurements on Ge-doped AlGaN samples show no EPR spectra in the dark, while persistent EPR spectra is observed upon photoexcitation with photon energies greater than ~1.3 eV. Thermally annealing the samples decreased the EPR signal, with the critical temperature to quench the EPR signal being larger in the lower Al-content sample. Using detailed first-principles calculations of Ge in AlGaN, we show all of these observations can be explained by accounting for the DX configuration of Ge in AlGaN. |
| title | Nonradiative quenching of EPR signals in germanium-doped AlGaN: evidence for DX-center formation |
| topic | Materials Science |
| url | https://arxiv.org/abs/2411.12896 |