Photoelectron spectroscopy study of the electronic structures of Al/MgF[sub 2]/tris-(8-hydroxyquinoline) aluminum interfaces

Park, Y.; Lee, J.; Lee, S. K.; Kim, D. Y.
July 2001
Applied Physics Letters;7/2/2001, Vol. 79 Issue 1, p105
Academic Journal
We have studied the electronic structures of Al/MgF[sub 2]/tris-(8-hydroxyquinoline)aluminum (Alq[sub 3]) interface using UV and x-ray photoelectron spectroscopy [(UPS) and (XPS), respectively]. The UPS revealed that the valence peak shift occurred with MgF[sub 2] deposition before Al was deposited and was independent of the gap state formation. The XPS core level peaks indicated that the MgF[sub 2] strongly interacted with Al and O atoms in Alq[sub 3] even before Al was deposited, and the deposition of Al caused a slight change to the N 1s core level peak. These results indicate that the interaction mechanism in Al/MgF[sub 2]/Alq[sub 3] is different from those found in Al/LiF/Alq[sub 3] and other metal/Alq[sub 3]. © 2001 American Institute of Physics.


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