Effect of metal oxide morphology on electron injection from CdSe quantum dots to ZnO

Kaibo Zheng; Karel Žídek; Mohamed Abdellah; Pavel Chábera; Mahmoud S. Abd El-Sadek; Tõnu Pullerits

doi:10.1063/1.4803173

Effect of metal oxide morphology on electron injection from CdSe quantum dots to ZnO

Kaibo Zheng, Karel Žídek, Mohamed Abdellah, Pavel Chábera, Mahmoud S. Abd El-Sadek, Tõnu Pullerits

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

33 Citations (Scopus)

Abstract

Performance of quantum dot sensitized solar cells relies on a rapid electron injection from quantum dot to metal oxide. We studied the injection process in CdSe-ZnO system by ultrafast time-resolved absorption spectroscopy for two types of acceptor morphologies-nanowires and nanoparticles films. Based on comparison between experimental data and Marcus theory, we demonstrate that the acceptor morphology has a significant impact on electron injection due to (i) change in material permittivity and (ii) different density of the band-edge states. The results open a reference to improve injection efficiency in quantum dot-metal oxide system by selection of the acceptor morphology.

Original language	English
Article number	163119
Journal	Applied Physics Letters
Volume	102
Issue number	16
DOIs	https://doi.org/10.1063/1.4803173
Publication status	Published - Apr 22 2013
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Effect of metal oxide morphology on electron injection from CdSe quantum dots to ZnO",

abstract = "Performance of quantum dot sensitized solar cells relies on a rapid electron injection from quantum dot to metal oxide. We studied the injection process in CdSe-ZnO system by ultrafast time-resolved absorption spectroscopy for two types of acceptor morphologies-nanowires and nanoparticles films. Based on comparison between experimental data and Marcus theory, we demonstrate that the acceptor morphology has a significant impact on electron injection due to (i) change in material permittivity and (ii) different density of the band-edge states. The results open a reference to improve injection efficiency in quantum dot-metal oxide system by selection of the acceptor morphology.",

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AU - Zheng, Kaibo

AU - Žídek, Karel

AU - Abdellah, Mohamed

AU - Chábera, Pavel

AU - Abd El-Sadek, Mahmoud S.

AU - Pullerits, Tõnu

PY - 2013/4/22

Y1 - 2013/4/22

N2 - Performance of quantum dot sensitized solar cells relies on a rapid electron injection from quantum dot to metal oxide. We studied the injection process in CdSe-ZnO system by ultrafast time-resolved absorption spectroscopy for two types of acceptor morphologies-nanowires and nanoparticles films. Based on comparison between experimental data and Marcus theory, we demonstrate that the acceptor morphology has a significant impact on electron injection due to (i) change in material permittivity and (ii) different density of the band-edge states. The results open a reference to improve injection efficiency in quantum dot-metal oxide system by selection of the acceptor morphology.

AB - Performance of quantum dot sensitized solar cells relies on a rapid electron injection from quantum dot to metal oxide. We studied the injection process in CdSe-ZnO system by ultrafast time-resolved absorption spectroscopy for two types of acceptor morphologies-nanowires and nanoparticles films. Based on comparison between experimental data and Marcus theory, we demonstrate that the acceptor morphology has a significant impact on electron injection due to (i) change in material permittivity and (ii) different density of the band-edge states. The results open a reference to improve injection efficiency in quantum dot-metal oxide system by selection of the acceptor morphology.

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Effect of metal oxide morphology on electron injection from CdSe quantum dots to ZnO

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