Interface formation between tris(8-hydroxyquinoline) aluminum and ZnO nanowires and film

Jung Han Lee; Jeong Ho Shin; Jae Yong Song; Yeonjin Yi

doi:10.1063/1.3531812

Interface formation between tris(8-hydroxyquinoline) aluminum and ZnO nanowires and film

Jung Han Lee, Jeong Ho Shin, Jae Yong Song, Yeonjin Yi

Department of Physics

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

6 Citations (Scopus)

Abstract

The energy level alignments at the interface between tris(8- hydroxyquinoline) aluminum (Alq₃) and ZnO nanowires and thin film were studied with in situ x-ray and ultraviolet photoemission spectroscopy. The changes of work functions, highest occupied molecular orbitals, and core levels were measured with step-by-step deposition of Alq₃ on each ZnO substrate. Although both substrates show similar electronic structures, a larger interface dipole is induced at the interface between Alq₃ and ZnO nanowires. This results in the reduction of the electron injection barrier at the interface of Alq₃ /ZnO nanowires. Thus, the ZnO nanowire substrate is expected to show better performance than that of ZnO film when used as a cathode. We discussed the different interface dipole formation at each interface.

Original language	English
Article number	263302
Journal	Applied Physics Letters
Volume	97
Issue number	26
DOIs	https://doi.org/10.1063/1.3531812
Publication status	Published - 2010 Dec 27

Bibliographical note

Funding Information:
This work was supported by a research project of the Korea Research Foundation (Grant No. 2010-0010007) and Korea Research Council of Fundamental Science and Technology (KRCF) through the KRISS project of “Development of Advanced Industrial Metrology.”

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3531812

Cite this

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title = "Interface formation between tris(8-hydroxyquinoline) aluminum and ZnO nanowires and film",

abstract = "The energy level alignments at the interface between tris(8- hydroxyquinoline) aluminum (Alq3) and ZnO nanowires and thin film were studied with in situ x-ray and ultraviolet photoemission spectroscopy. The changes of work functions, highest occupied molecular orbitals, and core levels were measured with step-by-step deposition of Alq3 on each ZnO substrate. Although both substrates show similar electronic structures, a larger interface dipole is induced at the interface between Alq3 and ZnO nanowires. This results in the reduction of the electron injection barrier at the interface of Alq3 /ZnO nanowires. Thus, the ZnO nanowire substrate is expected to show better performance than that of ZnO film when used as a cathode. We discussed the different interface dipole formation at each interface.",

author = "Lee, {Jung Han} and Shin, {Jeong Ho} and Song, {Jae Yong} and Yeonjin Yi",

note = "Funding Information: This work was supported by a research project of the Korea Research Foundation (Grant No. 2010-0010007) and Korea Research Council of Fundamental Science and Technology (KRCF) through the KRISS project of “Development of Advanced Industrial Metrology.”",

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AU - Lee, Jung Han

AU - Shin, Jeong Ho

AU - Song, Jae Yong

AU - Yi, Yeonjin

N1 - Funding Information: This work was supported by a research project of the Korea Research Foundation (Grant No. 2010-0010007) and Korea Research Council of Fundamental Science and Technology (KRCF) through the KRISS project of “Development of Advanced Industrial Metrology.”

PY - 2010/12/27

Y1 - 2010/12/27

N2 - The energy level alignments at the interface between tris(8- hydroxyquinoline) aluminum (Alq3) and ZnO nanowires and thin film were studied with in situ x-ray and ultraviolet photoemission spectroscopy. The changes of work functions, highest occupied molecular orbitals, and core levels were measured with step-by-step deposition of Alq3 on each ZnO substrate. Although both substrates show similar electronic structures, a larger interface dipole is induced at the interface between Alq3 and ZnO nanowires. This results in the reduction of the electron injection barrier at the interface of Alq3 /ZnO nanowires. Thus, the ZnO nanowire substrate is expected to show better performance than that of ZnO film when used as a cathode. We discussed the different interface dipole formation at each interface.

AB - The energy level alignments at the interface between tris(8- hydroxyquinoline) aluminum (Alq3) and ZnO nanowires and thin film were studied with in situ x-ray and ultraviolet photoemission spectroscopy. The changes of work functions, highest occupied molecular orbitals, and core levels were measured with step-by-step deposition of Alq3 on each ZnO substrate. Although both substrates show similar electronic structures, a larger interface dipole is induced at the interface between Alq3 and ZnO nanowires. This results in the reduction of the electron injection barrier at the interface of Alq3 /ZnO nanowires. Thus, the ZnO nanowire substrate is expected to show better performance than that of ZnO film when used as a cathode. We discussed the different interface dipole formation at each interface.

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Interface formation between tris(8-hydroxyquinoline) aluminum and ZnO nanowires and film

Abstract

Bibliographical note

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