Unveiling the Electronic Structure of ZnO-C60 Core-Shell Quantum Dots: The Origin of Efficient Electron Transport

Gyeongho Hyun; Soohyung Park; Junkyeong Jeong; Kyu Seung Lee; Dong Ick Son; Hyunbok Lee; Yeonjin Yi

doi:10.1021/acs.jpcc.7b02725

Unveiling the Electronic Structure of ZnO-C₆₀ Core-Shell Quantum Dots: The Origin of Efficient Electron Transport

Gyeongho Hyun, Soohyung Park, Junkyeong Jeong, Kyu Seung Lee, Dong Ick Son, Hyunbok Lee, Yeonjin Yi

Department of Physics

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

6 Citations (Scopus)

Abstract

The electronic structure of ZnO core-C₆₀ shell (ZnO@C₆₀) quantum dots (QDs) was investigated with the help of model interface analysis between ZnO QDs and C₆₀ using in situ ultraviolet and X-ray photoelectron spectroscopy measurements. To form the ZnO QDs/C₆₀ interface in situ, a vacuum-integrated electrospray deposition technique was employed to simulate the electronic interactions between ZnO QDs and C₆₀ upon the formation of a ZnO@C₆₀ core-shell structure. Photoelectron spectra of ZnO QDs/C₆₀ interface formation were compared with those of ZnO@C₆₀ QD and pristine ZnO QD films. The results revealed that ZnO QDs and C₆₀ interacted via electron transfer leading to the change in ionization energy of the surface C₆₀. This induced a negligible energy barrier between the lowest unoccupied molecular orbital level of C₆₀ and the conduction band minimum of ZnO, which led to efficient electron transport through the ZnO@C₆₀ QDs. (Chemical Equation Presented).

Original language	English
Pages (from-to)	12230-12235
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	121
Issue number	22
DOIs	https://doi.org/10.1021/acs.jpcc.7b02725
Publication status	Published - 2017 Jun 8

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (Grants NRF-2015R1C1A1A01055026 and 2017R1A2B4002442), Samsung Display Company, and an Industry-Academy joint research program between Samsung Electronics and Yonsei University.

Publisher Copyright:
© 2017 American Chemical Society.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

Access to Document

10.1021/acs.jpcc.7b02725

Cite this

@article{dc8ef0b5b51b4f23b3110aebf0237627,

title = "Unveiling the Electronic Structure of ZnO-C60 Core-Shell Quantum Dots: The Origin of Efficient Electron Transport",

abstract = "The electronic structure of ZnO core-C60 shell (ZnO@C60) quantum dots (QDs) was investigated with the help of model interface analysis between ZnO QDs and C60 using in situ ultraviolet and X-ray photoelectron spectroscopy measurements. To form the ZnO QDs/C60 interface in situ, a vacuum-integrated electrospray deposition technique was employed to simulate the electronic interactions between ZnO QDs and C60 upon the formation of a ZnO@C60 core-shell structure. Photoelectron spectra of ZnO QDs/C60 interface formation were compared with those of ZnO@C60 QD and pristine ZnO QD films. The results revealed that ZnO QDs and C60 interacted via electron transfer leading to the change in ionization energy of the surface C60. This induced a negligible energy barrier between the lowest unoccupied molecular orbital level of C60 and the conduction band minimum of ZnO, which led to efficient electron transport through the ZnO@C60 QDs. (Chemical Equation Presented).",

author = "Gyeongho Hyun and Soohyung Park and Junkyeong Jeong and Lee, {Kyu Seung} and Son, {Dong Ick} and Hyunbok Lee and Yeonjin Yi",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (Grants NRF-2015R1C1A1A01055026 and 2017R1A2B4002442), Samsung Display Company, and an Industry-Academy joint research program between Samsung Electronics and Yonsei University. Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

year = "2017",

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doi = "10.1021/acs.jpcc.7b02725",

language = "English",

volume = "121",

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T1 - Unveiling the Electronic Structure of ZnO-C60 Core-Shell Quantum Dots

T2 - The Origin of Efficient Electron Transport

AU - Hyun, Gyeongho

AU - Park, Soohyung

AU - Jeong, Junkyeong

AU - Lee, Kyu Seung

AU - Son, Dong Ick

AU - Lee, Hyunbok

AU - Yi, Yeonjin

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (Grants NRF-2015R1C1A1A01055026 and 2017R1A2B4002442), Samsung Display Company, and an Industry-Academy joint research program between Samsung Electronics and Yonsei University. Publisher Copyright: © 2017 American Chemical Society.

PY - 2017/6/8

Y1 - 2017/6/8

N2 - The electronic structure of ZnO core-C60 shell (ZnO@C60) quantum dots (QDs) was investigated with the help of model interface analysis between ZnO QDs and C60 using in situ ultraviolet and X-ray photoelectron spectroscopy measurements. To form the ZnO QDs/C60 interface in situ, a vacuum-integrated electrospray deposition technique was employed to simulate the electronic interactions between ZnO QDs and C60 upon the formation of a ZnO@C60 core-shell structure. Photoelectron spectra of ZnO QDs/C60 interface formation were compared with those of ZnO@C60 QD and pristine ZnO QD films. The results revealed that ZnO QDs and C60 interacted via electron transfer leading to the change in ionization energy of the surface C60. This induced a negligible energy barrier between the lowest unoccupied molecular orbital level of C60 and the conduction band minimum of ZnO, which led to efficient electron transport through the ZnO@C60 QDs. (Chemical Equation Presented).

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