Quantum dot photodegradation due to CdSe-ZnO charge transfer: Transient absorption study

K. Žídek; K. Zheng; P. Chábera; M. Abdellah; T. Pullerits

doi:10.1063/1.4729382

Quantum dot photodegradation due to CdSe-ZnO charge transfer: Transient absorption study

K. Žídek, K. Zheng, P. Chábera, M. Abdellah, T. Pullerits

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

32 Citations (Scopus)

Abstract

We study changes in ultrafast transient absorption due to photodegradation of quantum dots attached to ZnO nanowire. The time-resolved measurements reveal impact of photodegradation on three distinct kinetic components present in transient absorption τ ∼ 7 ps, 80 ps, and 7.5 ns). In addition, we observe superlinear dependence of photodegradation rate on concentration of excited electrons. The data are used to evaluate the mean electron back-recombination time of ∼1 μs.

Original language	English
Article number	243111
Journal	Applied Physics Letters
Volume	100
Issue number	24
DOIs	https://doi.org/10.1063/1.4729382
Publication status	Published - Jun 11 2012
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4729382

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abstract = "We study changes in ultrafast transient absorption due to photodegradation of quantum dots attached to ZnO nanowire. The time-resolved measurements reveal impact of photodegradation on three distinct kinetic components present in transient absorption τ ∼ 7 ps, 80 ps, and 7.5 ns). In addition, we observe superlinear dependence of photodegradation rate on concentration of excited electrons. The data are used to evaluate the mean electron back-recombination time of ∼1 μs.",

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AU - Abdellah, M.

AU - Pullerits, T.

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AB - We study changes in ultrafast transient absorption due to photodegradation of quantum dots attached to ZnO nanowire. The time-resolved measurements reveal impact of photodegradation on three distinct kinetic components present in transient absorption τ ∼ 7 ps, 80 ps, and 7.5 ns). In addition, we observe superlinear dependence of photodegradation rate on concentration of excited electrons. The data are used to evaluate the mean electron back-recombination time of ∼1 μs.

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Quantum dot photodegradation due to CdSe-ZnO charge transfer: Transient absorption study

Abstract

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