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

doi:10.1117/12.2060973

Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-Cd_xZn_1-xS quantum dots

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

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

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/Cd_xZn1_-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 language	English
Title of host publication	Nanophotonic Materials XI
Editors	Stefano Cabrini, Gilles Lérondel, Adam M. Schwartzberg, Taleb Mokari
Place of Publication	Washington DC USA
Publisher	SPIE - International Society for Optical Engineering
Number of pages	8
ISBN (Print)	9781628411881
DOIs	https://doi.org/10.1117/12.2060973
Publication status	Published - 2014
Externally published	Yes
Event	Nanophotonic Materials XI 2014 - San Diego, United States of America Duration: 20 Aug 2014 → 21 Aug 2014 Conference number: 11th https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9161.toc#FrontMatter:Volume9161

Publication series

Name	Proceedings of SPIE
Publisher	SPIE
Volume	9161
ISSN (Print)	0277-786X

Conference

Conference	Nanophotonic Materials XI 2014
Country/Territory	United States of America
City	San Diego
Period	20/08/14 → 21/08/14
Other	PROCEEDINGS VOLUME 9161 SPIE NANOSCIENCE + ENGINEERING \| 17-21 AUGUST 2014 Nanophotonic Materials XI
Internet address	https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9161.toc#FrontMatter:Volume9161

Keywords

ASE
core-shell
interface
multi-exciton
nanophotonics
quantum dot

Access to Document

10.1117/12.2060973

Cite this

Minotto, A., Todescato, F., Signorini, R., Jasieniak, J. J., & Bozio, R. (2014). Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-Cd_xZn_1-xS quantum dots. In S. Cabrini, G. Lérondel, A. M. Schwartzberg, & T. Mokari (Eds.), Nanophotonic Materials XI Article 916103 (Proceedings of SPIE; Vol. 9161). SPIE - International Society for Optical Engineering. https://doi.org/10.1117/12.2060973

Minotto, Alessandro ; Todescato, Francesco ; Signorini, Raffaella et al. / Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-Cd_xZn_1-xS quantum dots. Nanophotonic Materials XI. editor / Stefano Cabrini ; Gilles Lérondel ; Adam M. Schwartzberg ; Taleb Mokari. Washington DC USA : SPIE - International Society for Optical Engineering, 2014. (Proceedings of SPIE).

@inproceedings{a2b36ba1870240eeb4663e76774a5151,

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

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.",

keywords = "ASE, core-shell, interface, multi-exciton, nanophotonics, quantum dot",

author = "Alessandro Minotto and Francesco Todescato and Raffaella Signorini and Jasieniak, \{Jacek J.\} and Renato Bozio",

year = "2014",

doi = "10.1117/12.2060973",

language = "English",

isbn = "9781628411881",

series = "Proceedings of SPIE",

publisher = "SPIE - International Society for Optical Engineering",

editor = "Stefano Cabrini and Gilles L{\'e}rondel and Schwartzberg, \{Adam M.\} and Taleb Mokari",

booktitle = "Nanophotonic Materials XI",

address = "United States of America",

note = "Nanophotonic Materials XI 2014 ; Conference date: 20-08-2014 Through 21-08-2014",

url = "https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9161.toc\#FrontMatter:Volume9161",

}

Minotto, A, Todescato, F, Signorini, R, Jasieniak, JJ & Bozio, R 2014, Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-Cd_xZn_1-xS quantum dots. in S Cabrini, G Lérondel, AM Schwartzberg & T Mokari (eds), Nanophotonic Materials XI., 916103, Proceedings of SPIE, vol. 9161, SPIE - International Society for Optical Engineering, Washington DC USA, Nanophotonic Materials XI 2014, San Diego, California, United States of America, 20/08/14. https://doi.org/10.1117/12.2060973

Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-Cd_xZn_1-xS quantum dots. / Minotto, Alessandro; Todescato, Francesco; Signorini, Raffaella et al.
Nanophotonic Materials XI. ed. / Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari. Washington DC USA: SPIE - International Society for Optical Engineering, 2014. 916103 (Proceedings of SPIE; Vol. 9161).

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

TY - GEN

T1 - Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-CdxZn1-xS quantum dots

AU - Minotto, Alessandro

AU - Todescato, Francesco

AU - Signorini, Raffaella

AU - Jasieniak, Jacek J.

AU - Bozio, Renato

N1 - Conference code: 11th

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - ASE

KW - core-shell

KW - interface

KW - multi-exciton

KW - nanophotonics

KW - quantum dot

UR - https://www.scopus.com/pages/publications/84922791670

U2 - 10.1117/12.2060973

DO - 10.1117/12.2060973

M3 - Conference Paper

AN - SCOPUS:84922791670

SN - 9781628411881

T3 - Proceedings of SPIE

BT - Nanophotonic Materials XI

A2 - Cabrini, Stefano

A2 - Lérondel, Gilles

A2 - Schwartzberg, Adam M.

A2 - Mokari, Taleb

PB - SPIE - International Society for Optical Engineering

CY - Washington DC USA

T2 - Nanophotonic Materials XI 2014

Y2 - 20 August 2014 through 21 August 2014

ER -

Minotto A, Todescato F, Signorini R, Jasieniak JJ, Bozio R. Influence of core-shell interfaces on exciton and multi-exciton dynamics of CdSe-Cd_xZn_1-xS quantum dots. In Cabrini S, Lérondel G, Schwartzberg AM, Mokari T, editors, Nanophotonic Materials XI. Washington DC USA: SPIE - International Society for Optical Engineering. 2014. 916103. (Proceedings of SPIE). doi: 10.1117/12.2060973