Stability of tris(8-hydroxyquinoline)-aluminum(III) films investigated by vacuum ultraviolet spectroscopic ellipsometry
2005; American Institute of Physics; Volume: 86; Issue: 11 Linguagem: Inglês
10.1063/1.1883314
ISSN1520-8842
AutoresCameliu Himcinschi, Ovidiu D. Gordan, Georgeta Salvan, F. Müller, Dietrich R. T. Zahn, Christoph Cobet, N. Esser, W. Braun,
Tópico(s)Thin-Film Transistor Technologies
ResumoThe optical constants of tris(8-hydroxyquinoline)-aluminum(III) (Alq3) thin films were determined in the vacuum ultraviolet range up to 9.5eV by in situ spectroscopic ellipsometry measurements performed using synchrotron radiation. The exposure to atmosphere of the Alq3 films grown by organic molecular-beam deposition induces changes in ellipsometric spectra that are interpreted in terms of surface morphology changes. Alq3 films deposited by organic vapor phase deposition were found to be more stable upon exposure to atmosphere. Employing time-dependent density functional theory calculations, the features of the extinction coefficient were assigned to singlet-singlet transitions.
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