Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires

Kaibo Zheng; Karel Zidek; Mohamed Qenawy; Magne Torbjörnsson; Pavel Chabera; Shuyan Shao; Fengling Zhang; Tönu Pullerits

doi:10.1021/jp3098632

Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires

Kaibo Zheng, Karel Zidek, Mohamed Qenawy, Magne Torbjörnsson, Pavel Chabera, Shuyan Shao, Fengling Zhang, Tönu Pullerits

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

Abstract

A method for CdSe quantum dot (QD) sensitization of ZnO nanowires (NW) with fast adsorption rate is applied. Photoinduced excited state dynamics of the quantum dots in the case of more than monolayer coverage of the nanowires is studied. Transient absorption kinetics reveals an excitation depopulation process of indirectly attached quantum dots with a lifetime of similar to 4 ns. Photoluminescence and incident photon-to-electron conversion efficiency show that this process consists of both radiative e-h recombination and nonradiative excitation-to-charge conversion. We argue that the latter occurs via interdot energy transfer from the indirectly attached QDs to the dots with direct contact to the nanowires. From the latter, fast electron injection into ZnO occurs. The energy transfer time constant is found to be around 5 ns.

Original language	English
Pages (from-to)	5919-5925
Journal	The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
Volume	117
Issue number	29
DOIs	https://doi.org/10.1021/jp3098632
Publication status	Published - 2013

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Chemical Physics (S) (011001060)

Subject classification (UKÄ)

Atom and Molecular Physics and Optics

Access to Document

10.1021/jp3098632

Cite this

Zheng, K., Zidek, K., Qenawy, M., Torbjörnsson, M., Chabera, P., Shao, S., Zhang, F., & Pullerits, T. (2013). Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires. The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 117(29), 5919-5925. https://doi.org/10.1021/jp3098632

@article{53b6cd477dda4e4ea520da046f8ecc96,

title = "Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires",

abstract = "A method for CdSe quantum dot (QD) sensitization of ZnO nanowires (NW) with fast adsorption rate is applied. Photoinduced excited state dynamics of the quantum dots in the case of more than monolayer coverage of the nanowires is studied. Transient absorption kinetics reveals an excitation depopulation process of indirectly attached quantum dots with a lifetime of similar to 4 ns. Photoluminescence and incident photon-to-electron conversion efficiency show that this process consists of both radiative e-h recombination and nonradiative excitation-to-charge conversion. We argue that the latter occurs via interdot energy transfer from the indirectly attached QDs to the dots with direct contact to the nanowires. From the latter, fast electron injection into ZnO occurs. The energy transfer time constant is found to be around 5 ns.",

author = "Kaibo Zheng and Karel Zidek and Mohamed Qenawy and Magne Torbj{\"o}rnsson and Pavel Chabera and Shuyan Shao and Fengling Zhang and T{\"o}nu Pullerits",

note = "The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)",

year = "2013",

doi = "10.1021/jp3098632",

language = "English",

volume = "117",

pages = "5919--5925",

journal = "The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory",

issn = "1520-5215",

publisher = "The American Chemical Society (ACS)",

number = "29",

}

Zheng, K, Zidek, K, Qenawy, M, Torbjörnsson, M, Chabera, P, Shao, S, Zhang, F & Pullerits, T 2013, 'Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires', The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, vol. 117, no. 29, pp. 5919-5925. https://doi.org/10.1021/jp3098632

TY - JOUR

T1 - Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires

AU - Zheng, Kaibo

AU - Zidek, Karel

AU - Qenawy, Mohamed

AU - Torbjörnsson, Magne

AU - Chabera, Pavel

AU - Shao, Shuyan

AU - Zhang, Fengling

AU - Pullerits, Tönu

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)

PY - 2013

Y1 - 2013

N2 - A method for CdSe quantum dot (QD) sensitization of ZnO nanowires (NW) with fast adsorption rate is applied. Photoinduced excited state dynamics of the quantum dots in the case of more than monolayer coverage of the nanowires is studied. Transient absorption kinetics reveals an excitation depopulation process of indirectly attached quantum dots with a lifetime of similar to 4 ns. Photoluminescence and incident photon-to-electron conversion efficiency show that this process consists of both radiative e-h recombination and nonradiative excitation-to-charge conversion. We argue that the latter occurs via interdot energy transfer from the indirectly attached QDs to the dots with direct contact to the nanowires. From the latter, fast electron injection into ZnO occurs. The energy transfer time constant is found to be around 5 ns.

AB - A method for CdSe quantum dot (QD) sensitization of ZnO nanowires (NW) with fast adsorption rate is applied. Photoinduced excited state dynamics of the quantum dots in the case of more than monolayer coverage of the nanowires is studied. Transient absorption kinetics reveals an excitation depopulation process of indirectly attached quantum dots with a lifetime of similar to 4 ns. Photoluminescence and incident photon-to-electron conversion efficiency show that this process consists of both radiative e-h recombination and nonradiative excitation-to-charge conversion. We argue that the latter occurs via interdot energy transfer from the indirectly attached QDs to the dots with direct contact to the nanowires. From the latter, fast electron injection into ZnO occurs. The energy transfer time constant is found to be around 5 ns.

U2 - 10.1021/jp3098632

DO - 10.1021/jp3098632

M3 - Article

SN - 1520-5215

VL - 117

SP - 5919

EP - 5925

JO - The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory

JF - The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory

IS - 29

ER -

Fast Monolayer Adsorption and Slow Energy Transfer in CdSe Quantum Dot Sensitized ZnO Nanowires

Abstract

Bibliographical note

Subject classification (UKÄ)

Access to Document

Fingerprint

Cite this