Investigation into the heterostructure interface of CdSe-based core-shell quantum dots using surface-enhanced raman spectroscopy

Francesco Todescato Todescato; Alessandro Minotto; Raffaella Signorini; Jacek Jaroslaw Jasieniak; Renato Bozio

doi:10.1021/nn402022z

Investigation into the heterostructure interface of CdSe-based core-shell quantum dots using surface-enhanced raman spectroscopy

Francesco Todescato Todescato, Alessandro Minotto, Raffaella Signorini, Jacek Jaroslaw Jasieniak, Renato Bozio

Research output: Contribution to journal › Article › Research › peer-review

58 Citations (Scopus)

Abstract

The structural nature of heterointerfaces in core-shell semiconductor quantum dots (QDs) plays a crucial role in tailoring their optical properties. In this work we have focused on using surface-enhanced Raman spectroscopy as a nondestructive tool to investigate the structural evolution of such interfaces in CdSe/CdS and CdSe/Cd0.5Zn0.5S colloidal QDs. A comparison between the two systems shows significant structural variation across the core-shell interfaces for the two different materials: a smooth interface for the former and an abrupt interface for the latter. This structural difference modifies the electronic structure within the QDs, which directly dictates the confinement behavior of the electrons and holes. The implications of this translate to a better understanding of why graded CdSe/CdS/Cd 0.5Zn0.5S/ZnS QDs are so lucrative for linear and nonlinear fluorescence-based applications.

Original language	English
Pages (from-to)	6649 - 6657
Number of pages	9
Journal	ACS Nano
Volume	7
Issue number	8
DOIs	https://doi.org/10.1021/nn402022z
Publication status	Published - 2013
Externally published	Yes

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10.1021/nn402022z

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abstract = "The structural nature of heterointerfaces in core-shell semiconductor quantum dots (QDs) plays a crucial role in tailoring their optical properties. In this work we have focused on using surface-enhanced Raman spectroscopy as a nondestructive tool to investigate the structural evolution of such interfaces in CdSe/CdS and CdSe/Cd0.5Zn0.5S colloidal QDs. A comparison between the two systems shows significant structural variation across the core-shell interfaces for the two different materials: a smooth interface for the former and an abrupt interface for the latter. This structural difference modifies the electronic structure within the QDs, which directly dictates the confinement behavior of the electrons and holes. The implications of this translate to a better understanding of why graded CdSe/CdS/Cd 0.5Zn0.5S/ZnS QDs are so lucrative for linear and nonlinear fluorescence-based applications.",

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AU - Todescato, Francesco Todescato

AU - Minotto, Alessandro

AU - Signorini, Raffaella

AU - Jasieniak, Jacek Jaroslaw

AU - Bozio, Renato

PY - 2013

Y1 - 2013

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Investigation into the heterostructure interface of CdSe-based core-shell quantum dots using surface-enhanced raman spectroscopy

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