title: Clean Transfer of Wafer-Scale Graphene via Liquid Phase Removal of Polycyclic Aromatic Hydrocarbons.
abstract: Pentacene (C22H14), a polycyclic aromatic hydrocarbon, was used as both supporting and sacrificing layers for the clean and doping-free graphene transfer. After successful transfer of graphene to a target substrate, the pentacene layer was physically removed from the graphene surface by using intercalating organic solvent. This solvent-mediated removal of pentacene from graphene surface was investigated by both theoretical calculation and experimental studies with various solvents. The uses of pentacene and appropriate intercalation solvent enabled graphene transfer without forming a residue from the supporting layer. Such residues tend to cause charged impurity scattering and unintentional graphene doping effects. As a result, this clean graphene exhibited extremely homogeneous surface potential profiles over a large area. A field-effect transistor fabricated using this graphene displayed a high hole (electron) mobility of 8050 cm(2)/V·s (9940 cm(2)/V·s) with a nearly zero Dirac point voltage.
authors: †Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors: Hyun Ho
authors: HH
authors: Kim
authors: †Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors: Boseok
authors: B
authors: Kang
authors: ‡Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, United States.
authors: Ji Won
authors: JW
authors: Suk
authors: §Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors: Nannan
authors: N
authors: Li
authors: ⊥Department of Chemistry, School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea.
authors: Kwang S
authors: KS
authors: Kim
authors: ‡Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, Austin, Texas 78712, United States.
authors: Rodney S
authors: RS
authors: Ruoff
authors: ∥Department of Organic and Nano System Engineering, Konkuk University, Seoul 143-701, Korea.
authors: Wi Hyoung
authors: WH
authors: Lee
authors: †Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors: Kilwon
authors: K
authors: Cho
keywords: chemical vapor deposition; graphene; graphene transistors; pentacene; transfer