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Electron cotunneling transport in gold nanocrystal arrays | | H. Moreira
; Q. Yu
; B. Nadal
; B. Bresson
; M. Rosticher
; N. Lequeux
; A. Zimmers
; H. Aubin
; | | Date: |
Wed, 19 Oct 2011 14:54:47 GMT (1880kb) | | Abstract: | We describe current-voltage characteristics I(V) of alkyl-ligated gold
nanocrystals $sim 5 nm$ 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, electronic diffusion
occurs through sequential tunneling and follows activated laws, as function of
temperature $sigma propto e^{-T_0/T}$ and as function of electric field $I
propto e^{-mathcal{E}_0/mathcal{E}}$. For better conducting arrays, i.e.
with small ligands, the transport properties crossover to the cotunneling
regime and follows Efros-Shklovskii laws as function of temperature $sigma
propto e^{-(T_{ES}/T)^{1/2}}$ and as function of electric field $I propto
e^{-(mathcal{E}_{ES}/mathcal{E})^{1/2}}$. The data shows that electronic
transport in nanocrystal arrays can be tuned from the sequential tunneling to
the cotunneling regime by increasing the tunnel barrier transparency. | | Source: | arXiv, 1110.4303 | | Services: | Forum | Review | PDF | Favorites | |
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