Journal Article

FZJ-2015-02092

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Noise characterization of metal-single molecule contacts

Xiang, D. ; Sydoruk, V.FZJ* ; Vitusevich, S. (Corresponding Author)FZJ* ; Petrychuk, M. V. ; Offenhäusser, A.FZJ* ; Kochelap, V. A. ; Belyaev, A. E. ; Mayer, D.FZJ*

2015
American Inst. of Physics Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/16832  doi:10.1063/1.4908252

Abstract: Noise spectra of molecule-free and molecule-containing mechanically controllable break junctions were investigated. The molecule-free junctions revealed typical 1/f noise characteristics. We studied three molecules as they bridged the electrodes: 11-mercaptoundecanoicacid, 1,8-octanedithiol, and 1,4-benzenedithiol, which possess different bonding strengths. For all of them, an additional Lorentzian-shape 1/f 2 noise component was registered with a characteristic frequency when the electrodes were bridged by an individual molecule. Measurements of time-dependent voltage fluctuations for the molecule-containing junctions bring out two-current state fluctuations, which in the frequency domain correspond to the 1/f 2 noise. Moreover, it is revealed that characteristic frequencies of these noise components are independent of molecule bonding strengths at the interface, but correlate with the molecule weights and current amplitudes in the lock-in state, in which the electrode gap is bridged by a single molecule. We attribute the noise monitored during charge transport through a molecular junction to the current induced molecular reconfigurations and suggest that the noise analysis can be used for characterization of metal-molecule coupling.

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Contributing Institute(s):

1. Bioelektronik (PGI-8)
2. JARA-FIT (JARA-FIT)

Research Program(s):

1. 523 - Controlling Configuration-Based Phenomena (POF3-523) (POF3-523)

Appears in the scientific report 2015

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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