Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-CdxZn1-xS quantum dots

Alessandro Minotto, Francesco Todescato, Raffaella Signorini, Jacek J. Jasieniak, Renato Bozio

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1 Citation (Scopus)

Abstract

Semiconductor quantum dots possess attractive optical properties useful in the photonic field. Thanks to the evolution of core-shell colloidal synthesis, quantum dots exhibit almost ideal emitting properties. Their employment in optoelectronic devices is encouraged by their size-tunable emission as well as by their high absorption cross-section and high photoluminescence quantum yield. In this work, starting from the archetypal CdSe based system, the influence of shell thickness and composition on exciton dynamics in CdSe/CdxZn1-xScore-shell QDs is investigated. By means of steadystate and transient optical spectroscopy, single-and multi-exciton recombination processes are characterized and correlated with different shell materials. The present study clarifies why graded CdSe-CdS-Cd0.5Zn0.5-ZnS core-shell represents the best performing heterostructure for optical gain applications, since such quantum dots combine the high radiative rates of CdS with the superior confinement potential of ZnS in a single dot.

Original languageEnglish
Title of host publicationNanophotonic Materials XI
EditorsStefano Cabrini, Gilles Lérondel, Adam M. Schwartzberg, Taleb Mokari
Place of PublicationWashington DC USA
PublisherSPIE
Number of pages8
ISBN (Print)9781628411881
DOIs
Publication statusPublished - 2014
Externally publishedYes
EventNanophotonic Materials XI 2014 - San Diego, United States of America
Duration: 20 Aug 201421 Aug 2014
Conference number: 11th
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9161.toc#FrontMatter:Volume9161

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume9161
ISSN (Print)0277-786X

Conference

ConferenceNanophotonic Materials XI 2014
CountryUnited States of America
CitySan Diego
Period20/08/1421/08/14
OtherPROCEEDINGS VOLUME 9161
SPIE NANOSCIENCE + ENGINEERING | 17-21 AUGUST 2014
Nanophotonic Materials XI
Internet address

Keywords

  • ASE
  • core-shell
  • interface
  • multi-exciton
  • nanophotonics
  • quantum dot

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