TY - JOUR
T1 - Highly Efficient Long-Range Electron Transport in a Viologen-Based Molecular Junction
AU - Nguyen, Quyen Van
AU - Martin, Pascal
AU - Frath, Denis
AU - Della Rocca, Maria Luisa
AU - Lafolet, Frederic
AU - Bellinck, Sebastien
AU - Lafarge, Philippe
AU - Lacroix, Jean Christophe
N1 - Funding Information:
The Agence Nationale de la Recherche (France) is gratefully acknowledged for its financial support of this work (ANR-15-CE09 0001-01). We thank Dr. John Lomas for editing our manuscript.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/8/15
Y1 - 2018/8/15
N2 - Thin layers of viologen-based oligomers with thicknesses between 3 and 14 nm were deposited on gold electrodes by electrochemical reduction of a diazonium salt, and then a Ti/Au top contact was applied to complete a solid-state molecular junction (MJ). MJs show symmetric J-V curves and highly efficient long-range transport, with an attenuation factor as small as 0.25 nm-1. This is attributed both to the fact that the viologen LUMO energy lies between the energies of the Fermi levels of the two contacts and to strong electronic coupling between molecules and contacts. As a consequence, resonant tunneling is likely to be the dominant transport mechanism within these MJs, but the temperature dependence of the transport properties suggests that activated redox hopping plays a role at high temperature.
AB - Thin layers of viologen-based oligomers with thicknesses between 3 and 14 nm were deposited on gold electrodes by electrochemical reduction of a diazonium salt, and then a Ti/Au top contact was applied to complete a solid-state molecular junction (MJ). MJs show symmetric J-V curves and highly efficient long-range transport, with an attenuation factor as small as 0.25 nm-1. This is attributed both to the fact that the viologen LUMO energy lies between the energies of the Fermi levels of the two contacts and to strong electronic coupling between molecules and contacts. As a consequence, resonant tunneling is likely to be the dominant transport mechanism within these MJs, but the temperature dependence of the transport properties suggests that activated redox hopping plays a role at high temperature.
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U2 - 10.1021/jacs.8b05589
DO - 10.1021/jacs.8b05589
M3 - Article
C2 - 30059213
AN - SCOPUS:85051637384
SN - 0002-7863
VL - 140
SP - 10131
EP - 10134
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 32
ER -