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Electrical transport through a metal-molecule-metal junction; Transport electrique a travers une jonction metal-molecule-metal

Abstract

We investigate the electrical transport through a very few molecules connected to metallic electrodes at room temperature. First, the state of the art in molecular electronics is outlined. We present the most convincing molecular devices reported so far in the literature and the theoretical tools available to analyze the electron transport mechanism through a molecular junction. Second, we describe the use of mechanically controllable break junctions to investigate the electron transport properties through a metal-molecule-metal junction. Two kindsof molecules were adsorbed on the two facing gold electrodes, dodecane-thiol (DT) and bis-thiol-ter-thiophene ({alpha},{omega} T3), that are basically expected to behave as an insulator and as a molecular wire, respectively. In the latter case, we study the chemical reactivity of the molecule and show that {alpha},{omega} T3 is chemically adsorbed on gold electrodes. Current-voltage characteristics of the junction were observed at room temperature. The Gold-DT-Gold junction behaves as a simple metal-insulator-metal junction. On the other hand, the electron transport through a Gold-{alpha},{omega} T3-Gold junction explicitly involves the electronic structure of the molecule which gives rise to step-like features in the current-voltage characteristics. The measured zero bias conductance is interpreted using the scattering theory. At high bias, we discuss two different models: a  More>>
Authors:
Publication Date:
Dec 17, 1998
Product Type:
Thesis/Dissertation
Report Number:
FRCEA-TH-732
Reference Number:
EDB-00:107467
Resource Relation:
Other Information: TH: These Physique des Solides; 190 refs; PBD: 17 Dec 1998
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ATOM TRANSPORT; COUPLING; DIFFUSION; ELECTRICAL INSULATORS; ELECTRODES; ELECTRON TRANSFER; ELECTRONIC CIRCUITS; ELECTRONS; HAMILTONIANS; JOINTS; ORGANIC COMPOUNDS; TUNNEL EFFECT; WIRES
OSTI ID:
20049649
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France). Dept. de Recherche sur l'Etat Condense, les Atomes et les Molecules; Paris-11 Univ., 91 - Orsay (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR9905962014377
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
260 pages
Announcement Date:
Dec 18, 2000

Citation Formats

Kergueris, Ch. Electrical transport through a metal-molecule-metal junction; Transport electrique a travers une jonction metal-molecule-metal. France: N. p., 1998. Web.
Kergueris, Ch. Electrical transport through a metal-molecule-metal junction; Transport electrique a travers une jonction metal-molecule-metal. France.
Kergueris, Ch. 1998. "Electrical transport through a metal-molecule-metal junction; Transport electrique a travers une jonction metal-molecule-metal." France.
@misc{etde_20049649,
title = {Electrical transport through a metal-molecule-metal junction; Transport electrique a travers une jonction metal-molecule-metal}
author = {Kergueris, Ch}
abstractNote = {We investigate the electrical transport through a very few molecules connected to metallic electrodes at room temperature. First, the state of the art in molecular electronics is outlined. We present the most convincing molecular devices reported so far in the literature and the theoretical tools available to analyze the electron transport mechanism through a molecular junction. Second, we describe the use of mechanically controllable break junctions to investigate the electron transport properties through a metal-molecule-metal junction. Two kindsof molecules were adsorbed on the two facing gold electrodes, dodecane-thiol (DT) and bis-thiol-ter-thiophene ({alpha},{omega} T3), that are basically expected to behave as an insulator and as a molecular wire, respectively. In the latter case, we study the chemical reactivity of the molecule and show that {alpha},{omega} T3 is chemically adsorbed on gold electrodes. Current-voltage characteristics of the junction were observed at room temperature. The Gold-DT-Gold junction behaves as a simple metal-insulator-metal junction. On the other hand, the electron transport through a Gold-{alpha},{omega} T3-Gold junction explicitly involves the electronic structure of the molecule which gives rise to step-like features in the current-voltage characteristics. The measured zero bias conductance is interpreted using the scattering theory. At high bias, we discuss two different models: a coherent model where the electron has no time to be completely re-localized in the molecule and a sequential model where the electron is localized in the molecule during the transfer. Finally, we show that the mechanical action of decreasing the inter-electrodes spacing can be used to induce a strong modification of the current-voltage characteristics. (author)}
place = {France}
year = {1998}
month = {Dec}
}