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Proceedings Paper

Interface formation between Al and Ca with tris-(8-hydroxyquinoline) aluminum
Author(s): Quoc Toan Le; M. Gary Mason; Li Yan; Vi-En Choong; Eric W. Forsythe; Ching W. Tang; Yongli Gao
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Paper Abstract

Using x-ray and UV photoemission spectroscopy (XPS and UPS), we have investigated the early stages of the interface formation between metals, namely Al and Ca, and tris-(8- hydroxyquinoline) aluminum (Alq3). Both interfaces show signs of reaction between the metal and Alq3. However, the detailed behaviors of the two interfaces are very different. In the case of Al/Alq3 interface, the metal was found to react preferentially with the quinolate oxygen as soon as it was deposited onto Alq3. No evidence of reaction with the carbon was found. Unlike with Ca, little interaction between Al and nitrogen of the pyridyl was observed. UPS spectra show a quick disappearance of the Alq3 features as early as 0.7 angstrom of Al deposition, and also suggest the formation of a gap state induced by Al. In the case of Ca/Alq3, the interface is characterized by a staged interface reaction: for low Ca coverages, negatively charged Alq3 radical anions are formed by electron transfer from the Ca. The emergence of new states in the energy gap is observed in the UPS spectra. At higher overages, the Ca reacts with the phenoxide oxygen resulting in the decomposition of the Alq3 molecule.

Paper Details

Date Published: 18 May 1999
PDF: 7 pages
Proc. SPIE 3623, Organic Photonic Materials and Devices, (18 May 1999); doi: 10.1117/12.348384
Show Author Affiliations
Quoc Toan Le, Univ. of Rochester (United States)
M. Gary Mason, Eastman Kodak Co. (United States)
Li Yan, Univ. of Rochester (United States)
Vi-En Choong, Univ. of Rochester and Motorola (United States)
Eric W. Forsythe, Univ. of Rochester (United States)
Ching W. Tang, Eastman Kodak Co. (United States)
Yongli Gao, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 3623:
Organic Photonic Materials and Devices
Bernard Kippelen, Editor(s)

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