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Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals
dc.contributor.author | Christodoulou, Sotirios | |
dc.contributor.author | Rajadell Viciano, Fernando | |
dc.contributor.author | Casu, Alberto | |
dc.contributor.author | Vaccaro, Gianfranco | |
dc.contributor.author | Grim, Joel Q. | |
dc.contributor.author | Genovese, Alessandro | |
dc.contributor.author | Manna, Liberato | |
dc.contributor.author | Climente, Juan I. | |
dc.contributor.author | Meinardi, Francesco | |
dc.contributor.author | Rainò, Gabriele | |
dc.contributor.author | Stöferle, Thilo | |
dc.contributor.author | Mahrt, Rainer F. | |
dc.contributor.author | Planelles, Josep | |
dc.contributor.author | Brovelli, Sergio | |
dc.contributor.author | Moreels, Iwan | |
dc.date.accessioned | 2016-05-12T09:18:39Z | |
dc.date.available | 2016-05-12T09:18:39Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | CHRISTODOULOU, Sotirios, et al. Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals. Nature communications, 2015, vol. 6. | ca_CA |
dc.identifier.issn | 2041-1723 | |
dc.identifier.uri | http://hdl.handle.net/10234/159576 | |
dc.description.abstract | Strain in colloidal heteronanocrystals with non-centrosymmetric lattices presents a unique opportunity for controlling optoelectronic properties and adds a new degree of freedom to existing wavefunction engineering and doping paradigms. We synthesized wurtzite CdSe nanorods embedded in a thick CdS shell, hereby exploiting the large lattice mismatch between the two domains to generate a compressive strain of the CdSe core and a strong piezoelectric potential along its c-axis. Efficient charge separation results in an indirect ground-state transition with a lifetime of several microseconds, almost one order of magnitude longer than any other CdSe/CdS nanocrystal. Higher excited states recombine radiatively in the nanosecond time range, due to increasingly overlapping excited-state orbitals. k˙p calculations confirm the importance of the anisotropic shape and crystal structure in the buildup of the piezoelectric potential. Strain engineering thus presents an efficient approach to highly tunable single- and multiexciton interactions, driven by a dedicated core/shell nanocrystal design. | ca_CA |
dc.description.sponsorShip | F.R., J.I.C. and J.P. acknowledge financial support from MINECO project CTQ2011-27324 and UJI-Bancaixa P1-1B2011-01. S.B. and F.M. acknowledge support from the Cariplo Foundation (2012-0844). S.B. thanks the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 324603 for financial support (EDONHIST). The present publication is further realized with the support of the Ministero degli Affari Esteri e della Cooperazione Internazionale (IONX-NC4SOL, I.M.). K. Miszta (IIT, Italy) is acknowledged for initial discussions on the RIR samples, and W. Langbein (Cardiff University, UK) for enlightening conversations on strain and the Stark effect in CdSe/CdS superlattices. | ca_CA |
dc.format.extent | 8 p. | ca_CA |
dc.format.mimetype | application/pdf | ca_CA |
dc.language.iso | eng | ca_CA |
dc.publisher | Nature Publishing Group | ca_CA |
dc.relation.isPartOf | Nature communications, 2015, vol. 6. | ca_CA |
dc.rights | © Macmillan Publishers Limited. All Rights Reserved | ca_CA |
dc.rights | Attribution 4.0 International | * |
dc.rights.uri | http://creativecommons.org/licenses/by-sa/4.0/ | * |
dc.subject | physical sciences | ca_CA |
dc.subject | nanotechnology | ca_CA |
dc.subject | materials science | ca_CA |
dc.title | Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals | ca_CA |
dc.type | info:eu-repo/semantics/article | ca_CA |
dc.identifier.doi | http://dx.doi.org/10.1038/ncomms8905 | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca_CA |
dc.relation.publisherVersion | http://www.nature.com/ncomms/2015/150729/ncomms8905/full/ncomms8905.html | ca_CA |
dc.type.version | info:eu-repo/semantics/publishedVersion | ca_CA |
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