Title :

Molecular signature of polyoxometalates in electron transport of silicon-based molecular junctions

Author(s) :

Laurans, Maxime [Auteur]
Institut Parisien de Chimie Moléculaire [IPCM]
Dalla Francesca, Kevin [Auteur]
Institut Parisien de Chimie Moléculaire [IPCM]
Volatron, Florence [Auteur]
Institut Parisien de Chimie Moléculaire [IPCM]
Izzet, Guillaume [Auteur]
Institut Parisien de Chimie Moléculaire [IPCM]
Guérin, David [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Vuillaume, Dominique [Auteur]
Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Lenfant, Stéphane [Auteur]
Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Proust, Anna [Auteur]
Institut Parisien de Chimie Moléculaire [IPCM]

Journal title :

Nanoscale

Pages :

17156-17165

Publisher :

Royal Society of Chemistry

Publication date :

2018

ISSN :

2040-3364

HAL domain(s) :

Chimie/Matériaux
Chimie/Chimie inorganique

English abstract : [en]

Polyoxometalates (POMs) are unconventional electro-active molecules with a great potential for applications in molecular memories, providing efficient processing steps onto electrodes are available. The synthesis of the ...
Show more >Polyoxometalates (POMs) are unconventional electro-active molecules with a great potential for applications in molecular memories, providing efficient processing steps onto electrodes are available. The synthesis of the organic–inorganic polyoxometalate hybrids [PM11O39{Sn(C6H4)C[triple bond, length as m-dash]C(C6H4)N2}]3− (M = Mo, W) endowed with a remote diazonium function is reported together with their covalent immobilization onto hydrogenated n-Si(100) substrates. Electron transport measurements through the resulting densely-packed monolayers contacted with a mercury drop as a top electrode confirms their homogeneity. Adjustment of the current–voltage curves with the Simmon's equation gives a mean tunnel energy barrier ΦPOM of 1.8 eV and 1.6 eV, for the Silicon–Molecules–Metal (SMM) junctions based on the polyoxotungstates (M = W) and polyoxomolybdates (M = Mo), respectively. This follows the trend observed in the electrochemical properties of POMs in solution, the polyoxomolybdates being easier to reduce than the polyoxotungstates, in agreement with lowest unoccupied molecular orbitals (LUMOs) of lower energy. The molecular signature of the POMs is thus clearly identifiable in the solid-state electrical properties and the unmatched diversity of POM molecular and electronic structures should offer a great modularity.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL