Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/44522
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Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Wendav, T. | por |
dc.contributor.author | Fischer, I. A. | por |
dc.contributor.author | Virgilio, M. | por |
dc.contributor.author | Capellini, G. | por |
dc.contributor.author | Oliveira, F. | por |
dc.contributor.author | Cerqueira, M. F. | por |
dc.contributor.author | Benedetti, A. | por |
dc.contributor.author | Chiussi, S. | por |
dc.contributor.author | Zaumseil, P. | por |
dc.contributor.author | Schwartz, B. | por |
dc.contributor.author | Busch, K. | por |
dc.contributor.author | Schulze, J. | por |
dc.date.accessioned | 2017-01-31T11:01:41Z | - |
dc.date.available | 2017-01-31T11:01:41Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | Physical Review B 94, pp. 245304 (2016) | por |
dc.identifier.issn | 2469-9950 | por |
dc.identifier.uri | https://hdl.handle.net/1822/44522 | - |
dc.description.abstract | Employing 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.sponsorship | T.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.iso | eng | por |
dc.publisher | American Physical Society | por |
dc.rights | openAccess | por |
dc.subject | Photoluminescence | por |
dc.subject | Ge | por |
dc.subject | quantum wells | por |
dc.title | Photoluminescence from ultrathin Ge-rich multi-quantum wells observed up to room-temperature: experiments and modeling | por |
dc.type | article | por |
dc.peerreviewed | yes | por |
dc.relation.publisherversion | http://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.245304 | por |
sdum.publicationstatus | info:eu-repo/semantics/publishedVersion | por |
oaire.citationStartPage | 245304-1 | por |
oaire.citationEndPage | 245304-10 | por |
oaire.citationIssue | 24 | por |
oaire.citationTitle | Physical Review B | por |
oaire.citationVolume | 94 | por |
dc.identifier.eissn | 2469-9969 | por |
dc.identifier.doi | 10.1103/PhysRevB.94.245304 | por |
dc.subject.fos | Ciências Naturais::Ciências Físicas | por |
dc.subject.wos | Science & Technology | por |
sdum.journal | Physical Review B | por |
Aparece nas coleções: | CDF - CEP - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Photoluminescence from ultrathin Ge-Torstein.pdf | 1,53 MB | Adobe PDF | Ver/Abrir |