Correlation between exciton-induced degradation of organic/metal interfaces and energy barrier for electron injection at organic/metal interfaces in organic optoelectronic devices

Qi Wang; Hany Aziz

doi:10.1117/12.2023639

27 September 2013 Correlation between exciton-induced degradation of organic/metal interfaces and energy barrier for electron injection at organic/metal interfaces in organic optoelectronic devices

Qi Wang, Hany Aziz

Author Affiliations +

Proceedings Volume 8829, Organic Light Emitting Materials and Devices XVII; 882920 (2013) https://doi.org/10.1117/12.2023639
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States

Abstract

We study exciton-induced degradation of various organic/metal interfaces in organic optoelectronic devices. The results show that organic/metal interfaces are susceptible to irradiation in general, resulting in a deterioration in charge transport across the interfaces. We find that organic/metal interfaces containing the same organic material but different metals degrade quite differently, where interfaces with metals of high work function are more susceptible to exciton-induced degradation than those with metals of low work function. The results suggest a clear correlation between excitoninduced degradation of organic/metal interfaces and energy barrier for electron injection at organic/metal interfaces. Furthermore, the fact that the use of interfacial layers, which usually contain alkali metals of extremely low work function, can greatly improve organic/metal interfacial photo-stability is also, to a large extent, consistent with such correlation. The reason behind such correlation may stem from the difference in the strength of organic-metal bonds in organometallic compounds formed at different organic/metal interfaces and/or the difference in band bending of organic materials in the vicinity of organic/metal interfaces due to the use of metals of different work functions at the interfaces.

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Qi Wang and Hany Aziz "Correlation between exciton-induced degradation of organic/metal interfaces and energy barrier for electron injection at organic/metal interfaces in organic optoelectronic devices", Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 882920 (27 September 2013); https://doi.org/10.1117/12.2023639

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KEYWORDS

Interfaces

Metals

Silver

Magnesium

Aluminum

Organic materials

Optoelectronic devices

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