| Autre titre | Optical emission from germanium nanocrystals |
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| Téléchargement | - Voir la version finale : Editors' choice—optical emission from germanium nanocrystals (PDF, 1.2 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.1149/2.0041812jss |
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| Auteur | Rechercher : Rowell, N. L.1Identifiant ORCID : https://orcid.org/0000-0001-7616-9396; Rechercher : Lockwood, D. J.1Identifiant ORCID : https://orcid.org/0000-0002-3001-2630; Rechercher : Houghton, D. C.2; Rechercher : Noël, J.-P.2; Rechercher : Baribeau, J.-M.2 |
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| Affiliation | - Conseil national de recherches du Canada. Centre de recherche en métrologie
- Conseil national de recherches du Canada
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| Format | Texte, Article |
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| Résumé | We analyze the intense photoluminescence (PL) observed at energies from 600 to 1100 meV for a large number of Si₁₋ₓGeₓ epitaxial layers grown by molecular beam epitaxy. In the present work we show that this previously unexplained broad PL peak can be assigned to Ge nanocrystals (NCs) self-assembled within the SiGe layers. These NCs are assumed to be lattice matched to the SiGe in the vertical, growth direction. A consequence of this assignment is that 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 bandgap (BG) below that of bulk Ge. We examine the PL results for more than 60 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 momentum conserving phonon energy for Ge. Strain and confinement shifted NC bound exciton energies calculated numerically agree well with the measured ones. When Raman scattering results were examined for some of the same samples, the phonon mode frequencies obtained provided valuable corroborative evidence for the presence of the Ge NCs. |
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| Date de publication | 2018-11-29 |
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| Maison d’édition | Electrochemical Society
IOP |
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| Licence | |
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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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| 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 | 0ef78934-9319-4bd4-a136-85f0bebdea9f |
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| Enregistrement créé | 2020-06-16 |
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| Enregistrement modifié | 2021-08-30 |
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