title: Roll-to-roll production of 30-inch graphene films for transparent electrodes.
abstract: 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.
authors.affiliation: SKKU Advanced Institute of Nanotechnology and Center for Human Interface Nano Technology, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Sukang
authors.initials: S
authors.lastname: Bae
authors.forename: Hyeongkeun
authors.initials: H
authors.lastname: Kim
authors.forename: Youngbin
authors.initials: Y
authors.lastname: Lee
authors.forename: Xiangfan
authors.initials: X
authors.lastname: Xu
authors.forename: Jae-Sung
authors.initials: JS
authors.lastname: Park
authors.forename: Yi
authors.initials: Y
authors.lastname: Zheng
authors.forename: Jayakumar
authors.initials: J
authors.lastname: Balakrishnan
authors.forename: Tian
authors.initials: T
authors.lastname: Lei
authors.forename: Hye Ri
authors.initials: HR
authors.lastname: Kim
authors.forename: Young Il
authors.initials: YI
authors.lastname: Song
authors.forename: Young-Jin
authors.initials: YJ
authors.lastname: Kim
authors.forename: Kwang S
authors.initials: KS
authors.lastname: Kim
authors.forename: Barbaros
authors.initials: B
authors.lastname: Ozyilmaz
authors.forename: Jong-Hyun
authors.initials: JH
authors.lastname: Ahn
authors.forename: Byung Hee
authors.initials: BH
authors.lastname: Hong
authors.forename: Sumio
authors.initials: S
authors.lastname: Iijima
mesh_terms: D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D006108:Graphite