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Georgia Journal of Science

Article Title

Solution process tris (8-hydroxyquinoline) aluminum thin films by spin coating technique: static and dynamic dispense methods

Abstract

We report properties of Tris-(8-hydroxyquinoline) aluminum (Alq3) thin films prepared by static and dynamic dispense spin coating techniques. A solution of Alq3 dissolved in CHCl3 is used to prepare thin films on glass substrate with a thickness of 70 ±10 nm. Atomic Force Microscope images show the existence of cracks, pinholes, and uneven surfaces with larger molecular aggregates for the films prepared by static dispense method. However, the dynamic dispense method made promising results healing the cracks and making the surface homogeneous. It is found using UV-Vis spectroscopy and Tauc’s plots that the HOMO-LUMO gaps are 2.78 and 2.95 eV for the Alq3 films prepared from static and dynamic dispense methods respectively. The large energy gap is attributed to smaller molecular aggregates in the films prepared using dynamic dispense method.

Acknowledgements

Funding support provided by the Georgia Space Grant Consortium, a NASA Training Grant NNH18ZHA007C.

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