Chloride-Induced Thickness Control in CdSe Nanoplatelets
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http://dx.doi.org/10.1021/acs.nanolett.8b02361 |
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Título
Chloride-Induced Thickness Control in CdSe NanoplateletsAutoría
Fecha de publicación
2018Editor
ACS PublicationsISSN
1530-6984; 1530-6992Cita bibliográfica
CHRISTODOULOU, Sotirios, et al. Chloride-Induced Thickness Control in CdSe Nanoplatelets. Nano letters, 2018, vol. 18, no 10, p. 6248-6254.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.acs.org/doi/10.1021/acs.nanolett.8b02361Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Current colloidal synthesis methods for CdSe
nanoplatelets (NPLs) routinely yield samples that emit, in
discrete steps, from 460 to 550 nm. A significant challenge lies
with obtaining thicker NPLs, to further widen ... [+]
Current colloidal synthesis methods for CdSe
nanoplatelets (NPLs) routinely yield samples that emit, in
discrete steps, from 460 to 550 nm. A significant challenge lies
with obtaining thicker NPLs, to further widen the emission
range. This is at present typically achieved via colloidal atomic
layer deposition onto CdSe cores, or by synthesizing NPL
core/shell structures. Here, we demonstrate a novel reaction
scheme, where we start from 4.5 monolayer (ML) NPLs and
increase the thickness in a two-step reaction that switches
from 2D to 3D growth. The key feature is the enhancement of
the growth rate of basal facets by the addition of CdCl2, resulting in a series of nearly monodisperse CdSe NPLs with
thicknesses between 5.5 and 8.5 ML. Optical characterization yielded emission peaks from 554 nm up to 625 nm with a line
width (fwhm) of 9−13 nm, making them one of the narrowest colloidal nanocrystal emitters currently available in this spectral
range. The NPLs maintained a short emission lifetime of 5−11 ns. Finally, due to the increased red shift of the NPL band edge
photoluminescence excitation spectra revealed several high-energy peaks. Calculation of the NPL band structure allowed us to
identify these excited-state transitions, and spectral shifts are consistent with a significant mixing of light and split-off hole states.
Clearly, chloride ions can add a new degree of freedom to the growth of 2D colloidal nanocrystals, yielding new insights into
both the NPL synthesis as well as their optoelectronic properties [-]
Publicado en
Nano Lett. 2018, 18.Proyecto de investigación
CTQ2017-83781-P; B2017-59; Grant 696656 GrapheneCore1; Grant 714876 PHOCONADerechos de acceso
© 2018 American Chemical Society
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