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Low-temperature cotunneling electron transport in photo-switchable molecule-nanoparticle networks.

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Název: Low-temperature cotunneling electron transport in photo-switchable molecule-nanoparticle networks.
Autoři: Viero, Yannick1, Guérin, David1, Vuillaume, Dominique1 dominique.vuillaume@iemn.fr
Zdroj: Journal of Applied Physics. 8/21/2025, Vol. 138 Issue 7, p1-8. 8p.
Témata: *ELECTRON transport, *LOW temperatures, *GOLD nanoparticles, *AZOBENZENE derivatives, *ISOMERIZATION, *ELECTRODES
Abstrakt: We report the temperature-dependent (4.2–300 K) electron transport properties (current–voltage) of photo-switchable two-dimensional arrays of gold nanoparticles (10 nm in diameter) functionalized by azobenzene derivatives. Under UV-light irradiation at 4.2 K, the azobenzene moieties are switched from the trans-to-cis isomers, leading to an increase of the current. In both conformations, at low temperature (<77 K) and low voltage (<1 V), the voltage- and temperature-dependent current behaviors show that electron cotunneling is the dominant transport mechanism. The number of cotunneling events Ncot slightly increases from ≈1.4 to 1.7 upon trans-to-cis isomerization of the azobenzenes. The nanoparticle Coulomb charging energy is not significantly modified (≈15 meV) by the azobenzene isomerization. This weak increase of Ncot is explained by the modest cis/trans current ratio (≤10) and the limited numbers of nanoparticle–molecule–nanoparticle junctions inserted between the two nanoscale electrodes (<50 nm apart) connecting the network. [ABSTRACT FROM AUTHOR]
Databáze: Academic Search Index
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Abstrakt:We report the temperature-dependent (4.2–300 K) electron transport properties (current–voltage) of photo-switchable two-dimensional arrays of gold nanoparticles (10 nm in diameter) functionalized by azobenzene derivatives. Under UV-light irradiation at 4.2 K, the azobenzene moieties are switched from the trans-to-cis isomers, leading to an increase of the current. In both conformations, at low temperature (<77 K) and low voltage (<1 V), the voltage- and temperature-dependent current behaviors show that electron cotunneling is the dominant transport mechanism. The number of cotunneling events Ncot slightly increases from ≈1.4 to 1.7 upon trans-to-cis isomerization of the azobenzenes. The nanoparticle Coulomb charging energy is not significantly modified (≈15 meV) by the azobenzene isomerization. This weak increase of Ncot is explained by the modest cis/trans current ratio (≤10) and the limited numbers of nanoparticle–molecule–nanoparticle junctions inserted between the two nanoscale electrodes (<50 nm apart) connecting the network. [ABSTRACT FROM AUTHOR]
ISSN:00218979
DOI:10.1063/5.0284541