Energy level alignments at tris(8-hydroquinoline) aluminum/8- hydroquinolatolithium/aluminum interfaces

Kwanghee Cho, Sang Wan Cho, Pyung Eun Jeon, Hyunbok Lee, Chung Nam Whang, Kwangho Jeong, Seong Jun Kang, Yeonjin Yi

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14 Citations (Scopus)

Abstract

The electronic structures of tris(8-hydroquinoline) aluminum (Al q3) 8 -hydroquinolatolithium (Liq)/Al interfaces were studied using in situ ultraviolet and x-ray photoelectron spectroscopy. We constructed complete energy level diagrams and analyzed chemical interactions at the interface. When Liq was inserted between Al and Al q3, the electron injection barrier was reduced by 0.56 eV compared to the structure without Liq. Additionally, a gap state was observed in the gap of Liq, which is related to an interfacial reaction. The N 1s spectra revealed that there were destructive chemical reactions between Al q3 and Al, which could be prevented by inserting Liq between them.

Original languageEnglish
Article number093304
JournalApplied Physics Letters
Volume92
Issue number9
DOIs
Publication statusPublished - 2008

Bibliographical note

Funding Information:
This work was supported by The Institute of Physics and Applied Physics (IPAP), Yonsei University, and BK21 project of the Korea Research Foundation (KRF).

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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