The paradox of an insulating contact between a chemisorbed molecule and a wide band gap semiconductor surface |
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Authors: | Yang H Boudrioua O Mayne A J Comtet G Dujardin G Kuk Y Sonnet Ph Stauffer L Nagarajan S Gourdon A |
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Institution: | Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris Sud 11, 91405 Orsay, France. |
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Abstract: | 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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