Roll-to-roll production of 30-inch graphene films for transparent electrodes.

By S. Bae, Hyeongkeun Kim, Youngbin Lee, Xiangfan Xu, Jae-Sung Park, Yi Zheng, Jayakumar Balakrishnan, T. Lei, H. R. Kim, Y. Song and 6 more. Nature Nanotechnology, 2009

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The outstanding electrical, mechanical and chemical properties of graphene make it attractive for applications in flexible electronics. However, efforts to make transparent conducting films from graphene have been hampered by the lack of efficient methods for the synthesis, transfer and doping of graphene at the scale and quality required for applications. Here, we report the roll-to-roll production and wet-chemical doping of predominantly monolayer 30-inch graphene films grown by chemical vapour deposition onto flexible copper substrates. The films have sheet resistances as low as approximately 125 ohms square(-1) with 97.4% optical transmittance, and exhibit the half-integer quantum Hall effect, indicating their high quality. We further use layer-by-layer stacking to fabricate a doped four-layer film and measure its sheet resistance at values as low as approximately 30 ohms square(-1) at approximately 90% transparency, which is superior to commercial transparent electrodes such as indium tin oxides. Graphene electrodes were incorporated into a fully functional touch-screen panel device capable of withstanding high strain.

Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/0fcd399b8fd3edd168178d0be016561a7d507621

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Citations in the corpus

Covalent bulk functionalization of graphene. (2011, background): “, by epitaxial or chemical vapour deposition (CVD) growt”
Two-dimensional MoS2: Properties, preparation, and applications (2015, background): “All these extraordinary properties benefit graphene for various applications, including transparent electrodes [4], energy storage [5], solar cells [6,7], wearable devices [8] and catalysis [9].”
Large-size graphene microsheets as a protective layer for transparent conductive silver nanowire film heaters (2014, methodology): “[12] Bae S, Kim H, Lee Y, Xu X, Park J, Zheng Y, et al.”
Electronic and magnetic properties of the graphene–ferromagnet interface (2010, methodology): “Further modifications of this method allow the preparation of predominantly monolayer graphene films with a size of more than 30 inches, which can be further transferred to a polymer film for the fabrication of transparent electrodes [20].”