Monitoring of Energy Conservation and Losses in Molecular Junctions through Characterization of Light Emission

When the molecular layer thickness exceeds 5–7 nm, the results provide strong evidence for a transition from elastic to inelastic transport and for stepwise, activationless transport up to 65 nm molecular layer thicknesses

Oleksii Ivashenko

2016

Scholarcy highlights

  • Emission of visible light from large area molecular junctions provides a direct measure of the energy of carriers when they encounter a conducting contact and stimulate photon emission
  • For carbon/molecule/carbon molecular junctions containing aromatic molecular layers with thicknesses less than 5 nm, transport is elastic, and the maximum emitted photon energy is equal to eVapp, where Vapp is the bias across the molecular junction. hvco increases monotonically with Vapp, is symmetric with polarity, but is weakly dependent on the nature of the contact material
  • When the molecular layer thickness exceeds 5–7 nm, the results provide strong evidence for a transition from elastic to inelastic transport and for stepwise, activationless transport up to 65 nm molecular layer thicknesses
  • Such information proves valuable for determining transport mechanisms and designing molecular junctions with desirable electronic properties
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