Interaction strength and molecular orientation of a single layer of pentacene in organic-metal interface and organic-organic heterostructures

Luca Gavioli, Mirco Chiodi, Carlo Mariani, Maria Grazia Betti, Marco Beccari, Valeria Di Castro, Albano Cossaro, Luca Floreano, Alberto Morgante, Aloke Kanjilal

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

32 Citazioni (Scopus)

Abstract

A single layer (SL) of pentacene molecules deposited on the Cu(119) surface and on an organic selfassembled monolayer (SAM) has been investigated by near-edge x-ray absorption fine structure (NEXAFS) at the C K edge, and by photoemission at the C 1s core level. The lowest unoccupied molecular orbitals (LUMOs) of the pentacene SL on the SAM are basically unaffected with respect to that of pentacene in the gas phase, indicating a weak interaction of pentacene with the SAM, while a strong redistribution of the LUMO-related final states is observed when the molecules are deposited on the Cu(119) substrate, sign of an electronic mixing between molecular and metal electronic states, in agreement with recent theoretical predictions. The strong dichroic response of the NEXAFS signal indicates upstanding pentacene molecules oriented 16° off normal for the organic-organic heterostructure. The rehybridization of pentacene orbitals with Cu states at the pentacene/Cu interface hinders an accurate determination of the molecule orientation, which is, however, compatible with molecules lying flat on the Cu(119) terraces.
Lingua originaleEnglish
pagine (da-a)115321-115327
Numero di pagine7
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
DOI
Stato di pubblicazionePubblicato - 2008

Keywords

  • STM
  • organic molecules
  • photoemission
  • self organization
  • vicinal surfaces

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