Conductance of molecular nanojunctions: Roles of surface topography and metal contacts

Nikolai Zhitenev, Artur Erbe, Zhenan Bao, Weirong Jiang, Eric Garfunkel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Relative surface topography of metal electrodes is one of the subtle issues determining the electrical performance of molecular devices. Systematic conductivity measurements of nanoscale junctions containing self-assembled monolayer of conjugated molecules are reported for a variety of metal electrodes. The monolayer is assembled on 25-100 nm electrode. Another 10-100 nm electrode is defined on top of the monolayer by metal evaporation. The characteristic energy scales are determined from the temperature dependence of conductance and from the non-linear current-voltage characteristics. Unexpectedly, the energy scales of the dominant conductance channels are small in comparison with the molecular level spacing. In all cases, the dominant room temperature conductance is hopping with characteristic energy of the order of 10-100 meV determined by the nature of metal contacts. Relative contribution of tunneling conductance strongly depends on the surface topography of the metal electrodes.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsW.Y.-C. Lai, S. Pau, O.D. Lopez
Pages91-99
Number of pages9
Volume5592
DOIs
Publication statusPublished - 2005
EventNanofabrication: Technologies, Devices, and Applications - Philadelphia, PA, United States
Duration: Oct 25 2004Oct 28 2004

Other

OtherNanofabrication: Technologies, Devices, and Applications
CountryUnited States
CityPhiladelphia, PA
Period10/25/0410/28/04

Fingerprint

Surface topography
electric contacts
topography
Electrodes
electrodes
Metals
metals
Monolayers
Self assembled monolayers
Current voltage characteristics
energy
Evaporation
spacing
evaporation
conductivity
Temperature
temperature dependence
Molecules
electric potential
room temperature

Keywords

  • Molecular electronics
  • Nanofabrication
  • Tunneling

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Zhitenev, N., Erbe, A., Bao, Z., Jiang, W., & Garfunkel, E. (2005). Conductance of molecular nanojunctions: Roles of surface topography and metal contacts. In WY-C. Lai, S. Pau, & O. D. Lopez (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 5592, pp. 91-99). [21] https://doi.org/10.1117/12.577210

Conductance of molecular nanojunctions : Roles of surface topography and metal contacts. / Zhitenev, Nikolai; Erbe, Artur; Bao, Zhenan; Jiang, Weirong; Garfunkel, Eric.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / W.Y.-C. Lai; S. Pau; O.D. Lopez. Vol. 5592 2005. p. 91-99 21.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Zhitenev, N, Erbe, A, Bao, Z, Jiang, W & Garfunkel, E 2005, Conductance of molecular nanojunctions: Roles of surface topography and metal contacts. in WY-C Lai, S Pau & OD Lopez (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 5592, 21, pp. 91-99, Nanofabrication: Technologies, Devices, and Applications, Philadelphia, PA, United States, 10/25/04. https://doi.org/10.1117/12.577210
Zhitenev N, Erbe A, Bao Z, Jiang W, Garfunkel E. Conductance of molecular nanojunctions: Roles of surface topography and metal contacts. In Lai WY-C, Pau S, Lopez OD, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 5592. 2005. p. 91-99. 21 https://doi.org/10.1117/12.577210
Zhitenev, Nikolai ; Erbe, Artur ; Bao, Zhenan ; Jiang, Weirong ; Garfunkel, Eric. / Conductance of molecular nanojunctions : Roles of surface topography and metal contacts. Proceedings of SPIE - The International Society for Optical Engineering. editor / W.Y.-C. Lai ; S. Pau ; O.D. Lopez. Vol. 5592 2005. pp. 91-99
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