The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots

Detalhes bibliográficos
Autor(a) principal: Vasilevskiy, Mikhail
Data de Publicação: 1998
Outros Autores: Akinkina, Evgenia, Paula, Ana Maria de, Anda, Enrique
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/5476
Resumo: The linear optical absorption of an ensemble of semiconductor quantum dots randomly positioned in an insulating matrix is studied theoretically and experimentally for the CdTe/glass system. The calculation of the effective dielectric function of the system, whose imaginary part determines the absorption, is based on a modified Maxwell–Garnett formalism using a diagram technique to calculate the average renormalized polarizability of spherical quantum dots. This approach takes into account both the fluctuations of the polarization interaction due to the random positions of the spheres and their size dispersion. A comparison of the theoretical and experimental spectra permits determination of the mean quantum dot size and concentration. The dependence of these parameters on the postgrowth annealing time of the samples is not consistent with the existing theories on the spinodal decomposition of solid solutions.
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spelling The effect of size dispersion on the optical absorption of a system of semiconductor quantum dotsQuantum dotsOptical absorptionDielectric functionCompositeThe linear optical absorption of an ensemble of semiconductor quantum dots randomly positioned in an insulating matrix is studied theoretically and experimentally for the CdTe/glass system. The calculation of the effective dielectric function of the system, whose imaginary part determines the absorption, is based on a modified Maxwell–Garnett formalism using a diagram technique to calculate the average renormalized polarizability of spherical quantum dots. This approach takes into account both the fluctuations of the polarization interaction due to the random positions of the spheres and their size dispersion. A comparison of the theoretical and experimental spectra permits determination of the mean quantum dot size and concentration. The dependence of these parameters on the postgrowth annealing time of the samples is not consistent with the existing theories on the spinodal decomposition of solid solutions.Russian Foundation for Fundamental Investigation (CAPES)American Physical SocietyUniversidade do MinhoVasilevskiy, MikhailAkinkina, EvgeniaPaula, Ana Maria deAnda, Enrique1998-121998-12-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/5476eng"Semiconductors". 32:11 (Nov. 1998) 1229-1233.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-05-11T05:58:57Zoai:repositorium.sdum.uminho.pt:1822/5476Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-05-11T05:58:57Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots
title The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots
spellingShingle The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots
Vasilevskiy, Mikhail
Quantum dots
Optical absorption
Dielectric function
Composite
title_short The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots
title_full The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots
title_fullStr The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots
title_full_unstemmed The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots
title_sort The effect of size dispersion on the optical absorption of a system of semiconductor quantum dots
author Vasilevskiy, Mikhail
author_facet Vasilevskiy, Mikhail
Akinkina, Evgenia
Paula, Ana Maria de
Anda, Enrique
author_role author
author2 Akinkina, Evgenia
Paula, Ana Maria de
Anda, Enrique
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Vasilevskiy, Mikhail
Akinkina, Evgenia
Paula, Ana Maria de
Anda, Enrique
dc.subject.por.fl_str_mv Quantum dots
Optical absorption
Dielectric function
Composite
topic Quantum dots
Optical absorption
Dielectric function
Composite
description The linear optical absorption of an ensemble of semiconductor quantum dots randomly positioned in an insulating matrix is studied theoretically and experimentally for the CdTe/glass system. The calculation of the effective dielectric function of the system, whose imaginary part determines the absorption, is based on a modified Maxwell–Garnett formalism using a diagram technique to calculate the average renormalized polarizability of spherical quantum dots. This approach takes into account both the fluctuations of the polarization interaction due to the random positions of the spheres and their size dispersion. A comparison of the theoretical and experimental spectra permits determination of the mean quantum dot size and concentration. The dependence of these parameters on the postgrowth annealing time of the samples is not consistent with the existing theories on the spinodal decomposition of solid solutions.
publishDate 1998
dc.date.none.fl_str_mv 1998-12
1998-12-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/5476
url http://hdl.handle.net/1822/5476
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Semiconductors". 32:11 (Nov. 1998) 1229-1233.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv mluisa.alvim@gmail.com
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