Nonradiative quenching of EPR signals in germanium-doped AlGaN: Evidence for DX-center formation
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 are observed upon photoexcita...
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| Veröffentlicht in: | Applied physics letters 2025-01, Vol.126 (4) |
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| container_title | Applied physics letters |
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| creator | Forbus, Jason Wickramaratne, Darshana Lyons, John L. Zvanut, M. E. |
| description | 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 are 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. |
| doi_str_mv | 10.1063/5.0249701 |
| format | Article |
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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.</description><subject>Critical temperature</subject><subject>DX centres</subject><subject>Electron paramagnetic resonance</subject><subject>First principles</subject><subject>Germanium</subject><subject>Photoexcitation</subject><subject>Spectra</subject><issn>0003-6951</issn><issn>1077-3118</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2025</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LAzEQhoMoWKsH_0HAk8LWyWaz2fVWaq1CqSI9eFtDPmpKN6nJbsF_b2p79jS88MzDzIvQNYERgZLesxHkRc2BnKABAc4zSkh1igYAQLOyZuQcXcS4TpHllA7Q58K7IJQVnd1p_N1rJ7-sW2Fv8PTtHUe7cmITsXV4pUMrnO3bTPmtVni8mYnFA57urEpLGhsf8ONHJrXrdNinNjm9u0RnJhn01XEO0fJpupw8Z_PX2ctkPM9kzUkmhVSm5qJgDESeV0wIraiirASimM4rTgQYzqEEY6BQGuqK1xVIXjNV5ECH6Oag3Qafvohds_Z92N_eUJIkBacVTdTtgZLBxxi0abbBtiL8NASafX8Na479JfbuwEZpu79X_oF_AaKibiA</recordid><startdate>20250127</startdate><enddate>20250127</enddate><creator>Forbus, Jason</creator><creator>Wickramaratne, Darshana</creator><creator>Lyons, John L.</creator><creator>Zvanut, M. 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| source | AIP Journals Complete |
| subjects | Critical temperature DX centres Electron paramagnetic resonance First principles Germanium Photoexcitation Spectra |
| title | Nonradiative quenching of EPR signals in germanium-doped AlGaN: Evidence for DX-center formation |
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