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Proceedings Paper

Surface treatments of indium tin oxide substrates: comprehensive investigation of mechanical, chemical, thermal, and plasma treatments
Author(s): Aleksandra B. Djurisic; TszWai Lau; Chung Yin Kwong; Weiling Guo; Yukun Bai; E. Herbert Li; Wai Kin Chan
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Paper Abstract

Various surface treatments significantly affect the work function and surface roughness of indium tin oxide (ITO), and thusly influence charge injection and overall performance of organic light emitting diodes (OLEDs). Large number of treatments, most commonly oxygen plasma treatment and UV-ozone treatment, have been proposed to improve characteristics of ITO. In this work, we have investigated a)mechanical treatments (mechanical rubbing, followed by ultrasonic bath), b)chemical treatments (dipping into aqueous solutions of various acids, including acids which have not been investigated previously) c)thermal treatments (thermal annealing in different atmospheres) d) plasma treatments e) UV ozone treatment f) different combinations of the above. We have measured surface sheet resistance of the samples and investigated surface morphology of the treated samples and compared them to as-received samples. We have selected several treatments giving best results. Then we have fabricated OLEDs using ITO substrates treated with treatments selected, as well as a control OLED fabricated on as-received ITO. The impact of ITO treatments on the performance of OLEDs have been investigated on two types of devices, OLEDs with and without transport layer, having the structures glass/ITO/Alq3/Al and glass/ITO/TPD/Alq3/Al, respectively, where Alq3(tris-(8-hydroxyquinoline)aluminum) is emitting layer and TPD(N,N'-diphenyl-N,N'-bis(3-methyl-phenyl)-1,1'biphenil- 4,4'diamine) is a hole transport layer.

Paper Details

Date Published: 27 February 2002
PDF: 8 pages
Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002);
Show Author Affiliations
Aleksandra B. Djurisic, Univ. of Hong Kong (Hong Kong)
TszWai Lau, Univ. of Hong Kong (Hong Kong)
Chung Yin Kwong, Univ. of Hong Kong (Hong Kong)
Weiling Guo, Univ. of Hong Kong (Hong Kong)
Yukun Bai, Univ. of Hong Kong (Hong Kong)
E. Herbert Li, Univ. of Hong Kong (United States)
Wai Kin Chan, Univ. of Hong Kong (Hong Kong)

Published in SPIE Proceedings Vol. 4464:
Organic Light-Emitting Materials and Devices V
Zakya H. Kafafi, Editor(s)

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