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Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2011

The paradox of an insulating contact between a chemisorbed molecule and a wide band gap semiconductor surface

H Yang
  • Fonction : Auteur
O Boudrioua
  • Fonction : Auteur
A Mayne
G Comtet
  • Fonction : Auteur
G Dujardin
Y Kuk
  • Fonction : Auteur
Louise Stauffer
  • Fonction : Auteur
S Nagarajan
  • Fonction : Auteur
A Gourdon
  • Fonction : Auteur

Résumé

Controlling the intrinsic optical and electronic properties of a single molecule adsorbed on a surface requires electronic decoupling of some molecular orbitals from the surface states. Scanning tunneling microscopy experiments and density functional theory calculations are used to study a perylene molecule derivative (DHH-PTCDI), adsorbed on the clean 3 × 3 reconstructed wide band gap silicon carbide surface (SiC(0001)-3 × 3). We find that the LUMO of the adsorbed molecule is invisible in I(V) spectra due to the absence of any surface or bulk states and that the HOMO has a very low saturation current in I(z) spectra. These results present a paradox that the molecular orbitals are electronically isolated from the surface of the wide band gap semiconductor even though strong chemical bonds are formed.

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Dates et versions

hal-04471950 , version 1 (21-02-2024)

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H Yang, O Boudrioua, A Mayne, G Comtet, G Dujardin, et al.. The paradox of an insulating contact between a chemisorbed molecule and a wide band gap semiconductor surface. Physical Chemistry Chemical Physics, 2011, 14 (5), pp.1700-1705. ⟨10.1039/c2cp23104b⟩. ⟨hal-04471950⟩
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