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http://hdl.handle.net/10773/20239
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DC Field | Value | Language |
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dc.contributor.author | Botas, Alexandre M. P. | pt |
dc.contributor.author | Anthony, Rebecca J. | pt |
dc.contributor.author | Wu, Jeslin | pt |
dc.contributor.author | Rowe, David J. | pt |
dc.contributor.author | Silva, Nuno J. O. | pt |
dc.contributor.author | Kortshagen, Uwe | pt |
dc.contributor.author | Pereira, Rui N. | pt |
dc.contributor.author | Ferreira, Rute A. S. | pt |
dc.date.accessioned | 2017-12-07T19:40:08Z | - |
dc.date.issued | 2016 | pt |
dc.identifier.issn | 0957-4484 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20239 | - |
dc.description.abstract | The light emission properties of silicon crystalline nanoparticles (SiNPs) have been investigated using steady-state and time-resolved photoluminescence measurements carried out at 12 K and at room temperature. To enable a comparative study of the role of surface terminal groups on the optical properties, we investigated SiNPs-H ensembles with the same mean NP diameter but differing on the surface termination, namely organic-functionalized with 1-dodecene (SiNPs-C12) and H-terminated (SiNPs-H). We show that although the spectral dependence of the light emission is rather unaffected by surface termination, characterized by a single broad band peaking at similar to 1.64 eV, both the exciton recombination lifetimes and quantum yields display a pronounced dependence on the surface termination. Exciton lifetimes and quantum yields are found to be significantly lower in SiNPs-H compared SiNPs-C12. This difference is due to distinct non-radiative recombination probabilities resulting from inter-NP exciton migration, which in SiNPs-C12 is inhibited by the energy barriers imposed by the bulky surface groups. The surface groups of organic-terminated SiPs are responsible for the inhibition of inter-NP exciton transfer, yielding a higher quantum yield compared to SiNPs-H. The surface oxidation of SiNPs-C12 leads to the appearance of a phenomenon of an exciton transference from to the Si core to oxide-related states that contribute to light emission. These excitons recombine radiatively, explaining why the emission quantum of the organic-terminated SiNPs is the same after surface oxidation of SiNPs-C12. | pt |
dc.language.iso | eng | pt |
dc.publisher | IOP PUBLISHING LTD | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147332/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147333/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/112885/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/126320/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | QUANTUM DOTS | pt |
dc.subject | SI NANOPARTICLES | pt |
dc.subject | PHOTOLUMINESCENCE PROPERTIES | pt |
dc.subject | ELECTRONIC-PROPERTIES | pt |
dc.subject | NANOCRYSTAL SOLIDS | pt |
dc.subject | AMORPHOUS-SILICON | pt |
dc.subject | VISIBLE SPECTRUM | pt |
dc.subject | PLASMA SYNTHESIS | pt |
dc.subject | ENERGY-TRANSFER | pt |
dc.subject | POROUS SILICON | pt |
dc.title | Influence of the surface termination on the light emission of crystalline silicon nanoparticles | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.issue | 32 | pt |
degois.publication.title | NANOTECHNOLOGY | pt |
degois.publication.volume | 27 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1088/0957-4484/27/32/325703 | pt |
dc.identifier.doi | 10.1088/0957-4484/27/32/325703 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Influence of the surface termination on the light emission of crystalline silicon nanoparticles_10.10880957-44842732325703.pdf | 1.97 MB | Adobe PDF |
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