Electron cotunneling transport in gold nanocrystals arrays
Résumé
We describe low temperature current-voltage characteristics I(V) measurements of alkyl-ligated gold nanocrystals ∼ 5 nm arrays in long screening length limit. Arrays with different alkyl ligand lengths have been prepared to tune the electronic tunnel coupling between the nanocrystals. For long ligands, i.e. small tunnel barrier transparency, electronic diffusion occurs through sequential tunneling and follows activated laws, as function of temperature σ ∝ e −T 0 /T and as function of electric field I ∝ e −E 0 /E. For small ligands, i.e. large tunnel barrier transparency, electron diffusion is due to cotunneling and follows Efros-Shklovskii laws, as function of temperature σ ∝ e −(T 0 /T) 1/2 and as function of electric field I ∝ e −(E 0 /E) 1/2 .
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