title: Direct mapping of electrical noise sources in molecular wire-based devices.
abstract: We report a noise mapping strategy for the reliable identification and analysis of noise sources in molecular wire junctions. Here, different molecular wires were patterned on a gold substrate, and the current-noise map on the pattern was measured and analyzed, enabling the quantitative study of noise sources in the patterned molecular wires. The frequency spectra of the noise from the molecular wire junctions exhibited characteristic 1/f2behavior, which was used to identify the electrical signals from molecular wires. This method was applied to analyze the molecular junctions comprising various thiol molecules on a gold substrate, revealing that the noise in the junctions mainly came from the fluctuation of the thiol bonds. Furthermore, we quantitatively compared the frequencies of such bond fluctuations in different molecular wire junctions and identified molecular wires with lower electrical noise, which can provide critical information for designing low-noise molecular electronic devices. Our method provides valuable insights regarding noise phenomena in molecular wires and can be a powerful tool for the development of molecular electronic devices.
authors.affiliation: Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Duckhyung
authors.initials: D
authors.lastname: Cho
authors.affiliation: Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Hyungwoo
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Shashank
authors.initials: S
authors.lastname: Shekhar
authors.affiliation: Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Myungjae
authors.initials: M
authors.lastname: Yang
authors.affiliation: Department of Automotive Engineering, Doowon Technical University College, Anseong 456-718, Korea.
authors.forename: Jae Yeol
authors.initials: JY
authors.lastname: Park
authors.affiliation: Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.|Department of Biophysics and Chemical Biology, Seoul National University, Seoul 151-747, Korea.
authors.forename: Seunghun
authors.initials: S
authors.lastname: Hong