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

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

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6 Citations (Scopus)


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 languageEnglish
Article number263302
JournalApplied Physics Letters
Issue number26
Publication statusPublished - 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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