Negative giant surface potential of peeled Alq(3) thin film

In order to observe negative giant surface potential (gSP), vacuum-evaporated tris(8-hydroxyquinolinolato) aluminum (Alq(3)) thin film on a polytetrafluoroethylene (PTFE) substrate was peeled off by an adhesive carbon tape in dark condition. Surface potential on the backside was negative, and the ab...

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Published in:Thin solid films 2009-11, Vol.518 (2), p.839-841
Main Authors: Okabayashi, Y, Ito, E, Isoshima, T, Ito, H, Hara, M
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creator Okabayashi, Y
Ito, E
Isoshima, T
Ito, H
Hara, M
description In order to observe negative giant surface potential (gSP), vacuum-evaporated tris(8-hydroxyquinolinolato) aluminum (Alq(3)) thin film on a polytetrafluoroethylene (PTFE) substrate was peeled off by an adhesive carbon tape in dark condition. Surface potential on the backside was negative, and the absolute values were about two-thirds of the surface potential values (positive values) of the films deposited on ITO with the same thickness. Our results indicate that the gSP does not originate in interfacial or bulk charge, but in anisotropic alignment of dipole moment of Alq(3) molecules in the film. With this simple procedure, we can realize Alq(3) film with opposite molecular alignment, which can be useful in device application.
doi_str_mv 10.1016/j.tsf.2009.07.099
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