Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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INVESTIGACIONMetadades
Títol
Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystalsAutoria
Data de publicació
2015Editor
Nature Publishing GroupISSN
2041-1723Cita bibliogràfica
CHRISTODOULOU, Sotirios, et al. Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals. Nature communications, 2015, vol. 6.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://www.nature.com/ncomms/2015/150729/ncomms8905/full/ncomms8905.htmlVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
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 ... [+]
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. [-]
Publicat a
Nature communications, 2015, vol. 6.Drets d'accés
© Macmillan Publishers Limited. All Rights Reserved
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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