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

Document Type

Article

Publication Date

1-1-2005

Abstract

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.

Keywords

surface potential Alq3 dipole space charge energy-level alignment light-emitting-diodes spectroscopy interfaces metal photoemission injection aluminum alq(3) ozone

Publication Title

Japanese Journal of Applied Physics

ISSN

0021-4922

Divisions

PHYSICS

Volume

44

Issue

2

Publisher

IOP Publishing

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