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Synthesis of Anisotropic CdSe/CdS Dot-in-Giant-Rod Nanocrystals with Persistent Blue-Shifted Biexciton Emission
dc.contributor.author | Polovitsyn, Anatolii | |
dc.contributor.author | Khan, Ali Hossain | |
dc.contributor.author | Angeloni, Ilaria | |
dc.contributor.author | Grim, Joel Q. | |
dc.contributor.author | Planelles, Josep | |
dc.contributor.author | Climente, Juan I. | |
dc.date.accessioned | 2019-03-28T07:52:38Z | |
dc.date.available | 2019-03-28T07:52:38Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | POLOVITSYN, Anatolii, et al. Synthesis of Anisotropic CdSe/CdS Dot-in-Giant-Rod Nanocrystals with Persistent Blue-Shifted Biexciton Emission. ACS Photonics, 2018, vol. 5, no 11, p. 4561-4568 | ca_CA |
dc.identifier.issn | 2330-4022 | |
dc.identifier.uri | http://hdl.handle.net/10234/181977 | |
dc.description.abstract | Anisotropic single-phase wurtzite CdSe/CdS nanocrystals were synthesized by colloidal chemistry, introducing ZnCl2 to increase the shell growth in the radial direction. As a result, dot-in-giant-rod nanocrystals were obtained, with a core diameter that varied between 3.2 and 7.5 nm and an overall diameter between 15 and 22 nm, corresponding to a 14–26 ML CdS shell. In addition to an extended fluorescence lifetime, typical for CdSe/CdS heteronanocrystals, all samples also yielded a blue-shifted biexciton emission peak. This contrasts with existing data on CdSe/CdS dot-in-rod nanocrystals with a thin shell, which yield a type-I band offset and attractive biexciton interactions for CdSe/CdS with a core larger than about 2.8 nm. However, k·p calculations support the blue shift, with a significant electron delocalization into the CdS shell even for large core diameter. We assign this effect to the influence of strain at the CdSe/CdS interface and associated reduction of the conduction band offset, as well as the buildup of a piezoelectric field along the nanorod long axis. The strain-induced electron–hole separation is particularly effective in large-core nanocrystals, providing a tool to engineer electron and hole wave functions that is complementary to quantum confinement. | ca_CA |
dc.format.extent | 8 p. | ca_CA |
dc.language.iso | eng | ca_CA |
dc.publisher | American Chemical Society | ca_CA |
dc.relation.isPartOf | ACS Photonics, 2018, vol. 5, no 11 | ca_CA |
dc.rights | Copyright © American Chemical Society | ca_CA |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | * |
dc.subject | band offset | ca_CA |
dc.subject | k·p calculations | ca_CA |
dc.subject | photoluminescence | ca_CA |
dc.subject | piezoelectric field | ca_CA |
dc.subject | quantum dots | ca_CA |
dc.subject | strain | ca_CA |
dc.title | Synthesis of Anisotropic CdSe/CdS Dot-in-Giant-Rod Nanocrystals with Persistent Blue-Shifted Biexciton Emission | ca_CA |
dc.type | info:eu-repo/semantics/article | ca_CA |
dc.identifier.doi | http://dx.doi.org/10.1021/acsphotonics.8b01028 | |
dc.relation.projectID | Ministero degli Affari Esteri e della Cooperazione Internazionale: IONX-NC4SOL; MINECO: CTQ2017-83781-P; UJI project: B2017-59 | ca_CA |
dc.rights.accessRights | info:eu-repo/semantics/restrictedAccess | ca_CA |
dc.relation.publisherVersion | https://pubs.acs.org/doi/abs/10.1021/acsphotonics.8b01028 | ca_CA |
dc.type.version | info:eu-repo/semantics/publishedVersion | ca_CA |
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