title: Synthesis of Large Area Graphene for High Performance in Flexible Optoelectronic Devices.
abstract: This work demonstrates an attractive low-cost route to obtain large area and high-quality graphene films by using the ultra-smooth copper foils which are typically used as the negative electrodes in lithium-ion batteries. We first compared the electronic transport properties of our new graphene film with the one synthesized by using commonly used standard copper foils in chemical vapor deposition (CVD). We observed a stark improvement in the electrical performance of the transistors realized on our graphene films. To study the optical properties on large area, we transferred CVD based graphene to transparent flexible substrates using hot lamination method and performed large area optical scanning. We demonstrate the promise of our high quality graphene films for large areas with ~400 cm(2) flexible optical modulators. We obtained a profound light modulation over a broad spectrum by using the fabricated large area transparent graphene supercapacitors and we compared the performance of our devices with the one based on graphene from standard copper. We propose that the copper foils used in the lithium-ion batteries could be used to obtain high-quality graphene at much lower-cost, with the improved performance of electrical transport and optical properties in the devices made from them.
authors.affiliation: Electronics and Nanoscale Engineering, University of Glasgow, Glasgow, G12 8QQ, UK.
authors.forename: Emre O
authors.initials: EO
authors.lastname: Polat
authors.affiliation: Department of Physics, Bilkent University, 06800, Ankara, Turkey.
authors.forename: Osman
authors.initials: O
authors.lastname: Balci
authors.affiliation: Department of Physics, Bilkent University, 06800, Ankara, Turkey.
authors.forename: Nurbek
authors.initials: N
authors.lastname: Kakenov
authors.affiliation: Department of Physics, Bilkent University, 06800, Ankara, Turkey.
authors.forename: Hasan Burkay
authors.initials: HB
authors.lastname: Uzlu
authors.affiliation: Department of Physics, Bilkent University, 06800, Ankara, Turkey.
authors.forename: Coskun
authors.initials: C
authors.lastname: Kocabas
authors.affiliation: Electronics and Nanoscale Engineering, University of Glasgow, Glasgow, G12 8QQ, UK.
authors.forename: Ravinder
authors.initials: R
authors.lastname: Dahiya