title: Work-Function Engineering of Graphene Electrodes by Self-Assembled Monolayers for High-Performance Organic Field-Effect Transistors.
abstract: We have devised a method to optimize the performance of organic field-effect transistors (OFETs) by controlling the work functions of graphene electrodes by functionalizing the surface of SiO2 substrates with self-assembled monolayers (SAMs). The electron-donating NH2-terminated SAMs induce strong n-doping in graphene, whereas the CH3-terminated SAMs neutralize the p-doping induced by SiO2 substrates, resulting in considerable changes in the work functions of graphene electrodes. This approach was successfully utilized to optimize electrical properties of graphene field-effect transistors and organic electronic devices using graphene electrodes. Considering the patternability and robustness of SAMs, this method would find numerous applications in graphene-based organic electronics and optoelectronic devices such as organic light-emitting diodes and organic photovoltaic devices.
authors: †Center for Superfunctional Materials, Department of Chemistry and ‡Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.|§SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT) and ∥Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Jaesung
authors: J
authors: Park
authors: †Center for Superfunctional Materials, Department of Chemistry and ‡Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.|§SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT) and ∥Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Wi Hyoung
authors: WH
authors: Lee
authors: †Center for Superfunctional Materials, Department of Chemistry and ‡Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.|§SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT) and ∥Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Sung
authors: S
authors: Huh
authors: †Center for Superfunctional Materials, Department of Chemistry and ‡Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.|§SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT) and ∥Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Sung Hyun
authors: SH
authors: Sim
authors: †Center for Superfunctional Materials, Department of Chemistry and ‡Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.|§SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT) and ∥Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Seung Bin
authors: SB
authors: Kim
authors: †Center for Superfunctional Materials, Department of Chemistry and ‡Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.|§SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT) and ∥Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Kilwon
authors: K
authors: Cho
authors: †Center for Superfunctional Materials, Department of Chemistry and ‡Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.|§SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT) and ∥Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Byung Hee
authors: BH
authors: Hong
authors: †Center for Superfunctional Materials, Department of Chemistry and ‡Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea.|§SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT) and ∥Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Kwang S
authors: KS
authors: Kim
keywords: doping; graphene; graphene field-effect transistor; organic field-effect transistor; self-assembled monolayer