Phonon-assisted nonradiative energy transfer from colloidal quantum dots to monocrystalline bulk silicon

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dc.citation.epage761en_US
dc.citation.spage760en_US
dc.contributor.authorYeltik, Aydanen_US
dc.contributor.authorGüzeltürk, Buraken_US
dc.contributor.authorHernandez-Martinez, Pedro L.en_US
dc.contributor.authorDemir, Volkan Demiren_US
dc.coverage.spatialBurlingame, CA, USAen_US
dc.date.accessioned2016-02-08T12:11:02Z
dc.date.available2016-02-08T12:11:02Z
dc.date.issued2012en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.descriptionDate of Conference: 23-27 September 2012en_US
dc.description.abstractSilicon is one of the most dominant materials in photovoltaics. To increase optical absorption of silicon solar cells, colloidal quantum dots (QDs) have been proposed as a good sensitizer candidate owing to their favorably high absorption cross-section and tunable emission and absorption properties. To this end, QD sensitization of silicon has previously been studied by mostly facilitating radiative energy transfer (RET) [1,2]. Although RET based sensitization has achieved a considerable increase in conversion efficiencies in silicon photovoltaics, RET is fundamentally limited due to the effective coupling problem of emitted photons to silicon. Alternatively, nonradiative energy transfer (NRET), which relies on near field dipole-dipole coupling [3], has been shown to be feasible in sensitizer-silicon hybrid systems [4-8]. Although colloidal QDs as a sensitizer have been used to facilitate NRET into silicon, the detailed mechanisms of NRET to an indirect bandgap nonluminecent material, together with the role of phonon assistance and temperature activation, have not been fully understood to date. In this study, we propose a QD-silicon nanostructure hybrid platform to study the NRET dynamics as a function of temperature for distinct separation thicknesses between the donor QDs and the acceptor silicon plane. Here, we show NRET from colloidal QDs to bulk Si using phonon assisted absorption, developing its physical model to explain temperature-dependent lifetime dynamics of NRET in these QD-Si hybrids. © 2012 IEEE.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T12:11:02Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2012en
dc.identifier.doi10.1109/IPCon.2012.6358845en_US
dc.identifier.issn1092-8081en_US
dc.identifier.urihttp://hdl.handle.net/11693/28099
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/IPCon.2012.6358845en_US
dc.source.titleIEEE Photonics Conference 2012en_US
dc.subjectAbsorption cross-sectionen_US
dc.subjectAbsorption propertyen_US
dc.subjectBulk siliconen_US
dc.subjectColloidal quantum dotsen_US
dc.subjectDipole-dipole couplingsen_US
dc.subjectEffective couplingen_US
dc.subjectEmitted photonsen_US
dc.subjectHybrid platformen_US
dc.subjectMonocrystallineen_US
dc.subjectNear fieldsen_US
dc.subjectNonradiative energy transferen_US
dc.subjectPhonon assisteden_US
dc.subjectPhotovoltaicsen_US
dc.subjectPhysical modelen_US
dc.subjectRadiative energy transferen_US
dc.subjectTemperature dependenten_US
dc.subjectTunable emissionsen_US
dc.subjectConversion efficiencyen_US
dc.subjectDynamicsen_US
dc.subjectEnergy transferen_US
dc.subjectHybrid systemsen_US
dc.subjectPhononsen_US
dc.subjectPhotonicsen_US
dc.subjectSemiconductor quantum dotsen_US
dc.subjectSingle crystalsen_US
dc.subjectSiliconen_US
dc.titlePhonon-assisted nonradiative energy transfer from colloidal quantum dots to monocrystalline bulk siliconen_US
dc.typeConference Paperen_US

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Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)