Understanding coordination reaction for producing stable electrode with various low work functions

Hirohiko Fukagawa (), Kazuma Suzuki, Hirokazu Ito, Kaito Inagaki, Tsubasa Sasaki, Taku Oono, Munehiro Hasegawa, Katsuyuki Morii and Takahisa Shimizu
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Hirohiko Fukagawa: Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories
Kazuma Suzuki: Graduate School of Science, Tokyo University of Science
Hirokazu Ito: Graduate School of Science, Tokyo University of Science
Kaito Inagaki: Graduate School of Science, Tokyo University of Science
Tsubasa Sasaki: Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories
Taku Oono: Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories
Munehiro Hasegawa: Nippon Shokubai Co., Ltd.
Katsuyuki Morii: Nippon Shokubai Co., Ltd.
Takahisa Shimizu: Japan Broadcasting Corporation (NHK), Science & Technology Research Laboratories

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract The realisation of a cathode with various work functions (WFs) is required to maximise the potential of organic semiconductors that have various electron affinities. However, the barrier-free contact for electrons could only be achieved by using reactive materials, which significantly reduce the environmental stability of organic devices. We show that a stable electrode with various WFs can be produced by utilising the coordination reaction between several phenanthroline derivatives and the electrode. Although the low WF of the electrode realised by using reactive materials is specific to the material, the WF of the phenanthroline-modified electrode is tunable depending on the amount of electron transfer associated with the coordination reaction. A phenanthroline-modified electrode that has a higher electron injection efficiency than lithium fluoride has been demonstrated. The observation of various WFs induced by the coordination reaction affords strategic perspectives on the development of stable cathodes unique to organic electronics.

Date: 2020
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DOI: 10.1038/s41467-020-17548-z

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