title: Tuning the Dirac point in CVD-grown graphene through solution processed n-type doping with 2-(2-methoxyphenyl)-1,3-dimethyl-2,3-dihydro-1H-benzoimidazole.
abstract: Controlling the Dirac point of graphene is essential for complementary circuits. Here, we describe the use of 2-(2-methoxyphenyl)-1,3-dimethyl-2,3-dihydro-1H-benzoimidazole (o-MeO-DMBI) as a strong n-type dopant for chemical-vapor-deposition (CVD) grown graphene. The Dirac point of graphene can be tuned significantly by spin-coating o-MeO-DMBI solutions on the graphene sheets at different concentrations. The transport of graphene can be changed from p-type to ambipolar and finally n-type. The electron transfer between o-MeO-DMBI and graphene was additionally confirmed by Raman imaging and photoemission spectroscopy (PES) measurements. Finally, we fabricated a complementary inverter via inkjet printing patterning of o-MeO-DMBI solutions on graphene to demonstrate the potential of o-MeO-DMBI n-type doping on graphene for future applications in electrical devices.
authors.affiliation: Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Wei
authors.forename: Nan
authors.initials: N
authors.lastname: Liu
authors.forename: Hye Ryoung
authors.initials: HR
authors.lastname: Lee
authors.forename: Eric
authors.initials: E
authors.lastname: Adijanto
authors.forename: Lijie
authors.initials: L
authors.lastname: Ci
authors.forename: Benjamin D
authors.initials: BD
authors.lastname: Naab
authors.forename: Jian Qiang
authors.initials: JQ
authors.lastname: Zhong
authors.forename: Jinseong
authors.initials: J
authors.lastname: Park
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
authors.forename: Zhenan
authors.initials: Z
authors.lastname: Bao
mesh_terms: D001562:Benzimidazoles / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D015394:Molecular Structure; D012996:Solutions; D014835:Volatilization
chemical_list: D001562:Benzimidazoles; D012996:Solutions; D006108:Graphite