title: 1/f Noise Scaling Analysis in Unipolar-Type Organic Nanocomposite Resistive Memory.
abstract: We studied noise characteristics of a nanocomposite of polyimide (PI) and phenyl-C61-butyric acid methyl ester (PCBM) (denoted as PI:PCBM), a composite for the organic nonvolatile resistive memory material. The current fluctuations were investigated over a bias range that covers various intermediate resistive states and negative differential resistance (NDR) in organic nanocomposite unipolar resistive memory devices. From the analysis of the 1/f(γ) type noises, scaling behavior between the relative noise power spectral density S̃ and resistance R was observed, indicating a percolating behavior. Considering a linear rate equation of the charge trapping-detrapping at traps, the percolation behavior and NDR could be understood by the modulation of the conductive phase fraction φ with an external bias. This study can enhance the understanding of the NDR phenomena in organic nanocomposite unipolar resistive memory devices in terms of the current path formation and the memory switching.
authors.affiliation: †Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Younggul
authors.initials: Y
authors.lastname: Song
authors.affiliation: †Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Hyunhak
authors.initials: H
authors.lastname: Jeong
authors.affiliation: †Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Jingon
authors.initials: J
authors.lastname: Jang
authors.affiliation: †Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Tae-Young
authors.initials: TY
authors.lastname: Kim
authors.affiliation: †Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Daekyoung
authors.initials: D
authors.lastname: Yoo
authors.affiliation: †Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Youngrok
authors.initials: Y
authors.lastname: Kim
authors.affiliation: ‡Department of Applied Physics, Hanyang University, Ansan 426-791, Korea.
authors.forename: Heejun
authors.initials: H
authors.lastname: Jeong
authors.affiliation: †Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 151-747, Korea.
authors.forename: Takhee
authors.initials: T
authors.lastname: Lee
keywords: noise characterization; organic memory; organic nanocomposite; percolation; unipolar resistive memory