Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/44522

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dc.contributor.authorWendav, T.por
dc.contributor.authorFischer, I. A.por
dc.contributor.authorVirgilio, M.por
dc.contributor.authorCapellini, G.por
dc.contributor.authorOliveira, F.por
dc.contributor.authorCerqueira, M. F.por
dc.contributor.authorBenedetti, A.por
dc.contributor.authorChiussi, S.por
dc.contributor.authorZaumseil, P.por
dc.contributor.authorSchwartz, B.por
dc.contributor.authorBusch, K.por
dc.contributor.authorSchulze, J.por
dc.date.accessioned2017-01-31T11:01:41Z-
dc.date.available2017-01-31T11:01:41Z-
dc.date.issued2016-
dc.identifier.citationPhysical Review B 94, pp. 245304 (2016)por
dc.identifier.issn2469-9950por
dc.identifier.urihttp://hdl.handle.net/1822/44522-
dc.description.abstractEmploying a low-temperature growth-mode, we fabricated ultrathin Si1-xGex/Si multiple quantum well (QW) structures with a well thickness of less than 1.5 nm and a Ge concentration above 60 % directly on a Si substrate. We identified an unusual temperature-dependent blueshift of the photoluminescence (PL) and an exceptionally low thermal quenching. We find that this behavior is related to the relative intensities of the no-phonon (NP) peak and a phonon-assisted replica that are the main contributors to the total PL signal. In order to investigate these aspects in more detail, we developed a strategy to calculate the PL spectrum employing a self-consistent multi-valley effective mass model in combination with second-order perturbation theory. According to our investigation, we find that while the phonon-assisted feature decreases with temperature, the NP feature shows a strong increase in the recombination rate. Besides leading to the observed robustness against thermal quenching, this causes the observed blueshift of the total PL signal.por
dc.description.sponsorshipT.W. and K.B. were supported by the Stiftung der Deutschen Wirtschaft (sdw) and by the Deutsche Forschungsgemeinschaft (DFG) through project B10 within the Collaborative Research Center (CRC) 951 Hybrid Inorganic/Organic Systems for Opto-Electronics. HRTEM measurements were financed by Xunta de Galica Grant No. GRC2014/008.por
dc.language.isoengpor
dc.publisherAmerican Physical Societypor
dc.rightsopenAccesspor
dc.subjectPhotoluminescencepor
dc.subjectGepor
dc.subjectquantum wellspor
dc.titlePhotoluminescence from ultrathin Ge-rich multi-quantum wells observed up to room-temperature: experiments and modelingpor
dc.typearticlepor
dc.peerreviewedyespor
dc.relation.publisherversionhttp://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.245304por
sdum.publicationstatusinfo:eu-repo/semantics/publishedVersionpor
oaire.citationStartPage245304-1por
oaire.citationEndPage245304-10por
oaire.citationIssue24por
oaire.citationTitlePhysical Review Bpor
oaire.citationVolume94por
dc.identifier.essn2469-9969por
dc.identifier.doi10.1103/PhysRevB.94.245304por
dc.subject.fosCiências Naturais::Ciências Físicaspor
dc.subject.wosScience & Technologypor
sdum.journalPhysical Review Bpor
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)

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