title: Electrical characterization of benzenedithiolate molecular electronic devices with graphene electrodes on rigid and flexible substrates.
abstract: We investigated the electrical characteristics of molecular electronic devices consisting of benzenedithiolate self-assembled monolayers and a graphene electrode. We used the multilayer graphene electrode as a protective interlayer to prevent filamentary path formation during the evaporation of the top electrode in the vertical metal-molecule-metal junction structure. The devices were fabricated both on a rigid SiO2/Si substrate and on a flexible poly(ethylene terephthalate) substrate. Using these devices, we investigated the basic charge transport characteristics of benzenedithiolate molecular junctions in length- and temperature-dependent analyses. Additionally, the reliability of the electrical characteristics of the flexible benzenedithiolate molecular devices was investigated under various mechanical bending conditions, such as different bending radii, repeated bending cycles, and a retention test under bending. We also observed the inelastic electron tunneling spectra of our fabricated graphene-electrode molecular devices. Based on the results, we verified that benzenedithiolate molecules participate in charge transport, serving as an active tunneling barrier in solid-state graphene-electrode molecular junctions.
authors.affiliation: Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea.
authors.forename: Yeonsik
authors.initials: Y
authors.lastname: Jang
authors.forename: Hyunhak
authors.initials: H
authors.lastname: Jeong
authors.forename: Dongku
authors.initials: D
authors.lastname: Kim
authors.forename: Wang-Taek
authors.initials: WT
authors.lastname: Hwang
authors.forename: Jun-Woo
authors.initials: JW
authors.lastname: Kim
authors.forename: Inho
authors.initials: I
authors.lastname: Jeong
authors.forename: Hyunwook
authors.initials: H
authors.lastname: Song
authors.forename: Jiyoung
authors.initials: J
authors.lastname: Yoon
authors.forename: Gyu-Chul
authors.initials: GC
authors.lastname: Yi
authors.forename: Heejun
authors.initials: H
authors.lastname: Jeong
authors.forename: Takhee
authors.initials: T
authors.lastname: Lee