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.
Christodoulou, S., Rajadell, F., Casu, A., Vaccaro, G., Grim, J., Genovese, A., et al. (2015). Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals. NATURE COMMUNICATIONS, 6 [10.1038/ncomms8905].
Citazione: | Christodoulou, S., Rajadell, F., Casu, A., Vaccaro, G., Grim, J., Genovese, A., et al. (2015). Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals. NATURE COMMUNICATIONS, 6 [10.1038/ncomms8905]. | |
Tipo: | Articolo in rivista - Articolo scientifico | |
Carattere della pubblicazione: | Scientifica | |
Presenza di un coautore afferente ad Istituzioni straniere: | Si | |
Titolo: | Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals | |
Autori: | Christodoulou, S; Rajadell, F; Casu, A; Vaccaro, G; Grim, J; Genovese, A; Manna, L; Climente, J; Meinardi, F; Rainò, G; Stöferle, T; Mahrt, R; Planelles, J; Brovelli, S; Moreels, I | |
Autori: | BROVELLI, SERGIO (Penultimo) | |
Data di pubblicazione: | 2015 | |
Lingua: | English | |
Rivista: | NATURE COMMUNICATIONS | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1038/ncomms8905 | |
Appare nelle tipologie: | 01 - Articolo su rivista |
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