Jump to main content
Jump to site search

Issue 36, 2018
Previous Article Next Article

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

Author affiliations

Abstract

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.

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

Back to tab navigation

Supplementary files

Article information


Submitted
18 Jun 2018
Accepted
29 Aug 2018
First published
30 Aug 2018

Nanoscale, 2018,10, 17156-17165
Article type
Paper

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

M. Laurans, K. Dalla Francesca, F. Volatron, G. Izzet, D. Guerin, D. Vuillaume, S. Lenfant and A. Proust, Nanoscale, 2018, 10, 17156
DOI: 10.1039/C8NR04946G

Social activity

Search articles by author

Spotlight

Advertisements