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Steady-state photoinduced absorption of CdSe/CdS octapod shaped nanocrystals

Colloidal branched nanocrystals have been attracting increasing attention due to evidence of an interesting relationship between their complex shape and charge carrier dynamics. Herein, continuous wave photoinduced absorption (CW PIA) measurements of CdSe/CdS octapod-shaped nanocrystals are reported... Full description

Journal Title: Physical Chemistry Chemical Physics 2011, Vol.13(33), pp.15326-15330
Main Author: Antognazza, Maria Rosa
Other Authors: Scotognella, Francesco , Miszta, Karol , Dorfs, Dirk , Zanella, Marco , Zavelani-rossi, Margherita , Manna, Liberato , Lanzani, Guglielmo , Tassone, Francesco
Format: Electronic Article Electronic Article
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ID: ISSN: 1463-9076 ; E-ISSN: 1463-9084 ; DOI: 10.1039/c1cp21402k
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title: Steady-state photoinduced absorption of CdSe/CdS octapod shaped nanocrystals
format: Article
creator:
  • Antognazza, Maria Rosa
  • Scotognella, Francesco
  • Miszta, Karol
  • Dorfs, Dirk
  • Zanella, Marco
  • Zavelani-rossi, Margherita
  • Manna, Liberato
  • Lanzani, Guglielmo
  • Tassone, Francesco
subjects:
  • Cadmium Compounds -- Chemistry
  • Nanoparticles -- Chemistry
  • Selenium Compounds -- Chemistry
  • Sulfides -- Chemistry
ispartof: Physical Chemistry Chemical Physics, 2011, Vol.13(33), pp.15326-15330
description: Colloidal branched nanocrystals have been attracting increasing attention due to evidence of an interesting relationship between their complex shape and charge carrier dynamics. Herein, continuous wave photoinduced absorption (CW PIA) measurements of CdSe/CdS octapod-shaped nanocrystals are reported. CW PIA spectra show strong bleaching due to the one-dimensional (1D) CdS pod states (480 nm) and the zero-dimensional (0D) CdSe core states (690 nm). The agreement with previously reported ultrafast pumpprobe experiments indicates that this strong bleaching signal may be assigned to state filling. Additional bleaching features at 520 and 560 nm are characterized by a longer lifetime and are thus ascribed to defect states, localized at the podcore interface of the octapod, showing that some of the initially photogenerated carriers get quickly trapped into these long-lived defect states. However, we remark that a relevant part of electrons remain untrapped: this opens up the opportunity to exploit octapod shaped nanocrystals in photovoltaics applications, as electron acceptor materials, considering that several efficient hole extracting materials are already available for the realization of a composite bulk heterojunction.
language:
source:
identifier: ISSN: 1463-9076 ; E-ISSN: 1463-9084 ; DOI: 10.1039/c1cp21402k
fulltext: fulltext
issn:
  • 1463-9076
  • 1463-9084
  • 14639084
  • 14639076
url: Link


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titleSteady-state photoinduced absorption of CdSe/CdS octapod shaped nanocrystals
creatorAntognazza, Maria Rosa ; Scotognella, Francesco ; Miszta, Karol ; Dorfs, Dirk ; Zanella, Marco ; Zavelani-rossi, Margherita ; Manna, Liberato ; Lanzani, Guglielmo ; Tassone, Francesco
ispartofPhysical Chemistry Chemical Physics, 2011, Vol.13(33), pp.15326-15330
identifier
descriptionColloidal branched nanocrystals have been attracting increasing attention due to evidence of an interesting relationship between their complex shape and charge carrier dynamics. Herein, continuous wave photoinduced absorption (CW PIA) measurements of CdSe/CdS octapod-shaped nanocrystals are reported. CW PIA spectra show strong bleaching due to the one-dimensional (1D) CdS pod states (480 nm) and the zero-dimensional (0D) CdSe core states (690 nm). The agreement with previously reported ultrafast pumpprobe experiments indicates that this strong bleaching signal may be assigned to state filling. Additional bleaching features at 520 and 560 nm are characterized by a longer lifetime and are thus ascribed to defect states, localized at the podcore interface of the octapod, showing that some of the initially photogenerated carriers get quickly trapped into these long-lived defect states. However, we remark that a relevant part of electrons remain untrapped: this opens up the opportunity to exploit octapod shaped nanocrystals in photovoltaics applications, as electron acceptor materials, considering that several efficient hole extracting materials are already available for the realization of a composite bulk heterojunction.
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subjectCadmium Compounds -- Chemistry ; Nanoparticles -- Chemistry ; Selenium Compounds -- Chemistry ; Sulfides -- Chemistry;
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titleSteady-state photoinduced absorption of CdSe/CdS octapod shaped nanocrystals
descriptionColloidal branched nanocrystals have been attracting increasing attention due to evidence of an interesting relationship between their complex shape and charge carrier dynamics. Herein, continuous wave photoinduced absorption (CW PIA) measurements of CdSe/CdS octapod-shaped nanocrystals are reported. CW PIA spectra show strong bleaching due to the one-dimensional (1D) CdS pod states (480 nm) and the zero-dimensional (0D) CdSe core states (690 nm). The agreement with previously reported ultrafast pumpprobe experiments indicates that this strong bleaching signal may be assigned to state filling. Additional bleaching features at 520 and 560 nm are characterized by a longer lifetime and are thus ascribed to defect states, localized at the podcore interface of the octapod, showing that some of the initially photogenerated carriers get quickly trapped into these long-lived defect states. However, we remark that a relevant part of electrons remain untrapped: this opens up the opportunity to exploit octapod shaped nanocrystals in photovoltaics applications, as electron acceptor materials, considering that several efficient hole extracting materials are already available for the realization of a composite bulk heterojunction.
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abstractColloidal branched nanocrystals have been attracting increasing attention due to evidence of an interesting relationship between their complex shape and charge carrier dynamics. Herein, continuous wave photoinduced absorption (CW PIA) measurements of CdSe/CdS octapod-shaped nanocrystals are reported. CW PIA spectra show strong bleaching due to the one-dimensional (1D) CdS pod states (480 nm) and the zero-dimensional (0D) CdSe core states (690 nm). The agreement with previously reported ultrafast pumpprobe experiments indicates that this strong bleaching signal may be assigned to state filling. Additional bleaching features at 520 and 560 nm are characterized by a longer lifetime and are thus ascribed to defect states, localized at the podcore interface of the octapod, showing that some of the initially photogenerated carriers get quickly trapped into these long-lived defect states. However, we remark that a relevant part of electrons remain untrapped: this opens up the opportunity to exploit octapod shaped nanocrystals in photovoltaics applications, as electron acceptor materials, considering that several efficient hole extracting materials are already available for the realization of a composite bulk heterojunction.
doi10.1039/c1cp21402k
pages15326-15330
date2011-09-07