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

초록

The electronic structures of tris(8-hydroquinoline) aluminum (Alq(3))/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 Alq(3), 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 Alq(3) and Al, which could be prevented by inserting Liq between them. (c) 2008 American Institute of Physics.

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