title: Low-voltage organic electronics based on a gate-tunable injection barrier in vertical graphene-organic semiconductor heterostructures.
abstract: The vertical integration of graphene with inorganic semiconductors, oxide semiconductors, and newly emerging layered materials has recently been demonstrated as a promising route toward novel electronic and optoelectronic devices. Here, we report organic thin film transistors based on vertical heterojunctions of graphene and organic semiconductors. In these thin heterostructure devices, current modulation is accomplished by tuning of the injection barriers at the semiconductor/graphene interface with the application of a gate voltage. N-channel devices fabricated with a thin layer of C60 show a room temperature on/off ratio >10(4) and current density of up to 44 mAcm(-2). Because of the ultrashort channel intrinsic to the vertical structure, the device is fully operational at a driving voltage of 200 mV. A complementary p-channel device is also investigated, and a logic inverter based on two complementary transistors is demonstrated. The vertical integration of graphene with organic semiconductors via simple, scalable, and low-temperature fabrication processes opens up new opportunities to realize flexible, transparent organic electronic, and optoelectronic devices.
authors.affiliation: DOE Energy Frontier Research Center, ‡Department of Electrical Engineering, and §Department of Mechanical Engineering, Columbia University , New York, New York 10027, United States.
authors.forename: Htay
authors.initials: H
authors.lastname: Hlaing
authors.forename: Chang-Hyun
authors.initials: CH
authors.lastname: Kim
authors.forename: Fabio
authors.initials: F
authors.lastname: Carta
authors.forename: Chang-Yong
authors.initials: CY
authors.lastname: Nam
authors.forename: Rob A
authors.initials: RA
authors.lastname: Barton
authors.forename: Nicholas
authors.initials: N
authors.lastname: Petrone
authors.forename: James
authors.initials: J
authors.lastname: Hone
authors.forename: Ioannis
authors.initials: I
authors.lastname: Kymissis
mesh_terms: D004566:Electrodes; D006108:Graphite; D056656:Lab-On-A-Chip Devices; D012666:Semiconductors
chemical_list: D006108:Graphite
keywords: Graphene; low-voltage electronics; organic semiconductors; thin film transistors