AustralieFrV1, Main, Exploration, bibRecord, 00A026

Coupling between Ge-nanocrystals and defects in SiO2

Identifieur interne : 00A026 ( Main/Exploration ); précédent : 00A025; suivant : 00A027

Coupling between Ge-nanocrystals and defects in SiO2

Auteurs : J. Skov Jensen [Danemark] ; G. Franzo [Italie] ; T. P. Leervad Petersen [Danemark] ; R. Pereira [Danemark] ; J. Chevallier [Danemark] ; M. Christian Petersen [Danemark] ; B. Bech Nielsen [Danemark] ; A. Nylandsted Larsen [Danemark]

Source :

Journal of luminescence [ 0022-2313 ] ; 2006.

RBID : Pascal:07-0004301

Descripteurs français

Pascal (Inist)
- Défaut, Photoluminescence, Pulvérisation cathodique, Codopage, Addition germanium, Traitement thermique, Particule alpha, Spectre résolution temporelle, Effet rayonnement, Passivation, Transfert énergie, Exciton, Nanocristal, Silicium oxyde, SiO2, 7866N.

English descriptors

KwdEn :
- Alpha particles, Cathode sputtering, Codoping, Defects, Energy transfer, Excitons, Germanium additions, Heat treatments, Nanocrystal, Passivation, Photoluminescence, Radiation effects, Silicon oxides, Time resolved spectra.

Abstract

Room temperature photoluminescence (PL) at around 600 nm from magnetron-sputtered SiO₂ films co-doped with Ge is reported. The PL signal is observed in pure SiO₂, however, its intensity increases significantly in the presence of Ge-nanocrystals (Ge-nc). The PL intensity has been optimized by varying the temperature of heat treatment, type of gas during heat treatment, concentration of Ge in the SiO₂ films, and gas pressure during deposition. Maximum intensity occurs when Ge-nc of around 3.5nm are present in large concentration in SiO₂ layers deposited at fairly high gas pressure. Based on time resolved PL, and PL measurements after α-particle irradiation or H passivation, we attribute the origin of the PL to a defect in SiO₂(probably an O deficiency) that is excited through an energy transfer from Ge-nc. There is no direct PL from the Ge-nc; however, there is a strong coupling between excitons created in the Ge-nc and the SiO₂ defect.

Affiliations:

Danemark, Italie

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alpha particles</term>
<term>Cathode sputtering</term>
<term>Codoping</term>
<term>Defects</term>
<term>Energy transfer</term>
<term>Excitons</term>
<term>Germanium additions</term>
<term>Heat treatments</term>
<term>Nanocrystal</term>
<term>Passivation</term>
<term>Photoluminescence</term>
<term>Radiation effects</term>
<term>Silicon oxides</term>
<term>Time resolved spectra</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Défaut</term>
<term>Photoluminescence</term>
<term>Pulvérisation cathodique</term>
<term>Codopage</term>
<term>Addition germanium</term>
<term>Traitement thermique</term>
<term>Particule alpha</term>
<term>Spectre résolution temporelle</term>
<term>Effet rayonnement</term>
<term>Passivation</term>
<term>Transfert énergie</term>
<term>Exciton</term>
<term>Nanocristal</term>
<term>Silicium oxyde</term>
<term>SiO2</term>
<term>7866N</term>
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<front><div type="abstract" xml:lang="en">Room temperature photoluminescence (PL) at around 600 nm from magnetron-sputtered SiO<sub>2</sub>
 films co-doped with Ge is reported. The PL signal is observed in pure SiO<sub>2</sub>
, however, its intensity increases significantly in the presence of Ge-nanocrystals (Ge-nc). The PL intensity has been optimized by varying the temperature of heat treatment, type of gas during heat treatment, concentration of Ge in the SiO<sub>2</sub>
 films, and gas pressure during deposition. Maximum intensity occurs when Ge-nc of around 3.5nm are present in large concentration in SiO<sub>2</sub>
 layers deposited at fairly high gas pressure. Based on time resolved PL, and PL measurements after α-particle irradiation or H passivation, we attribute the origin of the PL to a defect in SiO<sub>2</sub>
(probably an O deficiency) that is excited through an energy transfer from Ge-nc. There is no direct PL from the Ge-nc; however, there is a strong coupling between excitons created in the Ge-nc and the SiO<sub>2</sub>
 defect.</div>
</front>
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Coupling between Ge-nanocrystals and defects in SiO2

Coupling between Ge-nanocrystals and defects in SiO2

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri