| Téléchargement | - Voir la version finale : Emission from strained germanium nanocrystals (PDF, 1.3 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.1149/08503.0041ecst |
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| Auteur | Rechercher : Rowell, Nelson L.1; Rechercher : Lockwood, David J.1 |
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| Affiliation | - Conseil national de recherches du Canada. Science des mesures et étalons
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| Format | Texte, Article |
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| Résumé | We analyse the intense photoluminescence (PL) observed at energies from 600 to 1500 meV for many molecular beam epitaxy grown Si1-xGex epitaxial layers. We show that the unexplained broad PL peak is due to self-assembled Ge nanocrystals (NCs) within the SiGe layers. The NCs are assumed lattice matched to the SiGe in the vertical, growth direction. As the Ge-fraction in the SiGe layer increases, the vertical strain in the NCs changes from compressive to tensile at x ~ 0.36, lowering the NC band gap (BG) below that of bulk Ge. We analyse PL results for 64 samples exhibiting this broad PL peak by examining how it follows the strained Ge BG for x from 0.05 to 0.53. The PL is resolvable as two narrower peaks separated by the TO phonon energy for Ge. Strain and confinement shifted NC bound exciton energies calculated numerically agree well with the measured ones. |
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| Date de publication | 2018-04-05 |
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| Maison d’édition | Electrochemical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 23004250 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 26e97e53-87e0-4a76-8dab-cfbb84c25b64 |
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| Enregistrement créé | 2018-10-15 |
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| Enregistrement modifié | 2020-05-30 |
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