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Molecule-induced interface states dominate charge transport in Si–alkyl–metal junctions

Semiconductor–molecule–metal junctions consisting of alkanethiol monolayers self-assembled on both p+ and n− type highly doped Si(111) wires contacted with a 10 µm Au wire in a crossed-wire geometry are examined. Low temperature transport measurements reveal that molecule-induced semiconductor interface states control charge transport across these systems. Inelastic electron tunneling spectroscopy also highlights the strong contribution of the induced interface states to the observed charge transport.