Epitaxial Growth of Pentacene Films on Metal Surfaces

Lukas, S.; Söhnchen, S.; Witte, Gregor; Wöll, Christof

doi:10.1002/cphc.200300892

Cited by 100 publications

(71 citation statements)

References 21 publications

(25 reference statements)

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“…2 into empty molecular orbitals. For thick films and gas-phase spectra, the first six peaks at low energies for both PEN and PFP stem from excitations into p* orbitals, while the broad higher-lying features involve r* orbitals [26][27][28]. The PEN ML spectrum evidences a single, broad peak in the low energy edge as a result of the strong electronic coupling of the molecules with the substrate.…”

Section: Resultsmentioning

confidence: 99%

Effect of fluorination on the molecule–substrate interactions of pentacene/Cu(100) interfaces

Oteyza

Wakayama

Liu³

et al. 2010

Chemical Physics Letters

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a b s t r a c tBy means of scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and nearedge X-ray absorption fine structure (NEXAFS), we study and compare the crystalline and electronic structure of fluorinated and non-fluorinated pentacene fims on Cu(1 0 0). Pentacene perfluorination strongly affects its electronic structure both in the bulk and at the metal-organic interface. While the azimuthal anisotropy of the molecule-substrate interactions on Cu(1 0 0) remains unaffected by the fluorination, the interaction mechanisms, as concluded from their effect on the core-levels and on the conduction band of the respective molecules, show a completely disparate behaviour.

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Section: Resultsmentioning

confidence: 99%

Effect of fluorination on the molecule–substrate interactions of pentacene/Cu(100) interfaces

Oteyza

Wakayama

Liu³

et al. 2010

Chemical Physics Letters

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“…Strong intermolecular interaction and/or weak, negligible molecule-substrate interaction often will lead to edge-on or standing orientation at the interface while the opposite cases cause a flat or face-on configuration [13,17,32]. Pentacene and other aromatic molecules tend to have strong interaction (chemisorption) with clean metallic surfaces and this strong interaction leads to flat lying or face-on orientation of pentacene (and similar aromatic molecules), at least in the first few ML(s) [18,20,23,24,28,33]. Additional film growth decouples the metal substrate and the bulk of the deposited molecules, which may lead to other orientations, e.g.…”

Section: Introductionmentioning

confidence: 99%

Energy level alignment in Au/pentacene/PTCDA trilayer stacks

Sehati

Fahlman

2013

Chemical Physics Letters

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Ultraviolet Photoelectron Spectroscopy is used to investigate the energy level alignment and molecular orientation at the interfaces in Au/pentacene/PTCDA trilayer stacks. We deduced a standing orientation for pentacene grown on Au while we conclude a flat lying geometry for PTCDA grown onto pentacene. We propose that the rough surface of polycrystalline Au induces the standing geometry in pentacene. It is further shown that in-situ deposition of PTCDA on pentacene can influence the orientation of the surface pentacene layer, flipping part of the surface pentacene molecules into a flat lying geometry, maximizing the orbital interaction across the pentacene-PTCDA heterojunction.

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“…More recently Söhnchen et al 12 and Lukas et al 13 have reported the coexistence of a p(6.5 x 2) structure with a c(13 x 2) structure of a pentacene monolayer (ML) on Cu(110), by annealing the sample during evaporation to 430 K. At these temperatures the second layer formation is thermodynamically less favorable than the nucleation of a highly ordered monolayer with only few defects. Pentacene layers with a similar structure have been shown by Chen et al 14 .…”

Section: Introductionmentioning

confidence: 99%