Extremely stable graphene electrodes doped with macromolecular acid

Sung-Joo Kwon, Tae-Hee Han, Taeg Yeoung Ko, Nannan Li, Youngsoo Kim, Dong Jin Kim, Sang-Hoon Bae, Yang Yang, Byung Hee Hong, Kwang S. Kim, Sunmin Ryu and Tae-Woo Lee ()
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Sung-Joo Kwon: Pohang University of Science and Technology (POSTECH)
Tae-Hee Han: Seoul National University
Taeg Yeoung Ko: Pohang University of Science and Technology (POSTECH)
Nannan Li: Ulsan National Institute of Science and Technology (UNIST)
Youngsoo Kim: Seoul National University
Dong Jin Kim: Seoul National University
Sang-Hoon Bae: University of California
Yang Yang: University of California
Byung Hee Hong: Seoul National University
Kwang S. Kim: Ulsan National Institute of Science and Technology (UNIST)
Sunmin Ryu: Pohang University of Science and Technology (POSTECH)
Tae-Woo Lee: Seoul National University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Although conventional p-type doping using small molecules on graphene decreases its sheet resistance (Rsh), it increases after exposure to ambient conditions, and this problem has been considered as the biggest impediment to practical application of graphene electrodes. Here, we report an extremely stable graphene electrode doped with macromolecular acid (perfluorinated polymeric sulfonic acid (PFSA)) as a p-type dopant. The PFSA doping on graphene provides not only ultra-high ambient stability for a very long time (> 64 days) but also high chemical/thermal stability, which have been unattainable by doping with conventional small-molecules. PFSA doping also greatly increases the surface potential (~0.8 eV) of graphene, and reduces its Rsh by ~56%, which is very important for practical applications. High-efficiency phosphorescent organic light-emitting diodes are fabricated with the PFSA-doped graphene anode (~98.5 cd A−1 without out-coupling structures). This work lays a solid platform for practical application of thermally-/chemically-/air-stable graphene electrodes in various optoelectronic devices.

Date: 2018
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DOI: 10.1038/s41467-018-04385-4

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