Enhancement of surface potential buildup and decay of tris(8-quinolinato)aluminum film deposited on ultraviolet/ozone-treated gold electrodes

• Main Authors: Kajimoto, N., Muhamad, M.R., Rahman, Saadah Abdul, Manaka, T., Iwamoto, M.
• Format: Article
• Published: IOP Publishing 2005
• Subjects: QC Physics
• Online Access: http://eprints.um.edu.my/7352/

The enhancement of the surface potential of tris(8-quinolinato)aluminum (Alq3) film deposited on ultraviolet (UV)/ozonetreated gold electrodes was confirmed by surface potential measurement, and the ordering of molecular dipoles was suggested. The enhanced surface potential of the order of 10 V decayed rapidly by photo irradiation, due to molecular dipole disordering, but a surface potential of 100-400mV remained. Interestingly, this remaining surface potential of Alq3 on the UV/ozonetreated gold electrode was always smaller than that of Alq3 film on an untreated gold electrode. It was concluded that the UV/ozone treatment is effective in decreasing the density of surface states at the Alq3-metal interface as well as for the enhancement of molecular dipole ordering.