Simultaneous Creation and Recovery of Trap States on Quantum Dots in a Photoirradiated CdSe-ZnO System

Karel Zidek; Kaibo Zheng; Mohamed Qenawy; Pavel Chabera; Tönu Pullerits; Masanori Tachyia

doi:10.1021/jp509242r

Simultaneous Creation and Recovery of Trap States on Quantum Dots in a Photoirradiated CdSe-ZnO System

Karel Zidek, Kaibo Zheng, Mohamed Qenawy, Pavel Chabera, Tönu Pullerits, Masanori Tachyia

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

Abstract

We study changes in the steady-state absorption and ultrafast transient absorption kinetics of the photoirradiated CdSe quantum dotZnO system. The changes enable us to reconstruct kinetics of trap creation, which are analyzed with respect to three possible models: trap creation without recovery, trap creation and recovery, and trap creation with an upper limit for trap number accommodated on a quantum dot. We demonstrate that only the model of parallel trap creation and recovery can explain our experimental data. The evidence points toward oxygen generating trapping sites on QD surface and simultaneously passivating the trapping sites by their oxidation.

Original language	English
Pages (from-to)	27567-27573
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	47
DOIs	https://doi.org/10.1021/jp509242r
Publication status	Published - 2014

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

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10.1021/jp509242r

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title = "Simultaneous Creation and Recovery of Trap States on Quantum Dots in a Photoirradiated CdSe-ZnO System",

abstract = "We study changes in the steady-state absorption and ultrafast transient absorption kinetics of the photoirradiated CdSe quantum dotZnO system. The changes enable us to reconstruct kinetics of trap creation, which are analyzed with respect to three possible models: trap creation without recovery, trap creation and recovery, and trap creation with an upper limit for trap number accommodated on a quantum dot. We demonstrate that only the model of parallel trap creation and recovery can explain our experimental data. The evidence points toward oxygen generating trapping sites on QD surface and simultaneously passivating the trapping sites by their oxidation.",

author = "Karel Zidek and Kaibo Zheng and Mohamed Qenawy and Pavel Chabera and T{\"o}nu Pullerits and Masanori Tachyia",

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 = "2014",

doi = "10.1021/jp509242r",

language = "English",

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pages = "27567--27573",

journal = "Journal of Physical Chemistry C",

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T1 - Simultaneous Creation and Recovery of Trap States on Quantum Dots in a Photoirradiated CdSe-ZnO System

AU - Zidek, Karel

AU - Zheng, Kaibo

AU - Qenawy, Mohamed

AU - Chabera, Pavel

AU - Pullerits, Tönu

AU - Tachyia, Masanori

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 - 2014

Y1 - 2014

N2 - We study changes in the steady-state absorption and ultrafast transient absorption kinetics of the photoirradiated CdSe quantum dotZnO system. The changes enable us to reconstruct kinetics of trap creation, which are analyzed with respect to three possible models: trap creation without recovery, trap creation and recovery, and trap creation with an upper limit for trap number accommodated on a quantum dot. We demonstrate that only the model of parallel trap creation and recovery can explain our experimental data. The evidence points toward oxygen generating trapping sites on QD surface and simultaneously passivating the trapping sites by their oxidation.

AB - We study changes in the steady-state absorption and ultrafast transient absorption kinetics of the photoirradiated CdSe quantum dotZnO system. The changes enable us to reconstruct kinetics of trap creation, which are analyzed with respect to three possible models: trap creation without recovery, trap creation and recovery, and trap creation with an upper limit for trap number accommodated on a quantum dot. We demonstrate that only the model of parallel trap creation and recovery can explain our experimental data. The evidence points toward oxygen generating trapping sites on QD surface and simultaneously passivating the trapping sites by their oxidation.

UR - https://www.scopus.com/pages/publications/84949115702

U2 - 10.1021/jp509242r

DO - 10.1021/jp509242r

M3 - Article

SN - 1932-7447

VL - 118

SP - 27567

EP - 27573

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 47

ER -

Simultaneous Creation and Recovery of Trap States on Quantum Dots in a Photoirradiated CdSe-ZnO System

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