Substrate-induced symmetry reduction of CuPc on Cu(111): An LT-STM study

Karacuban, Hatice; Lange, Manfred; Schaffert, Johannes; Weingart, Oliver; Wagner, Thorsten; Möller, R.

doi:10.1016/j.susc.2009.01.029

Cited by 75 publications

(76 citation statements)

References 28 publications

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“…The structure of PFP or CuPc monolayers on Ag (111) and Cu(111) have already been reported on in the literature. 9,[20][21][22][23][24] We therefore place our focus on the 4 mixed layers. When co-deposited (or deposited sequentially one after the other, which renders the same results) in an approximately 1:1 ratio, the two molecules form an ordered structure similar to that found for closely related systems, 14,25,26 in which molecules of one type surround themselves by the other type, maximizing donor-acceptor contact and -C-F···H-C-intermolecular interactions (Fig.…”

Section: Resultsmentioning

confidence: 99%

Self-Assembly of Bicomponent Molecular Monolayers: Adsorption Height Changes and Their Consequences

et al. 2014

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Codeposition of two molecular species [CuPc (donor) and PFP (acceptor)] on noble metal (111) surfaces leads to the self-assembly of an ordered mixed layer with maximized donor-acceptor contact area. The main driving force behind this arrangement is assumed to be the intermolecular C-F ··· H-C hydrogen-bond interactions. Such interactions would be maximized for a coplanar molecular arrangement. However, precise measurement of molecule-substrate distances in the molecular mixture reveals significantly larger adsorption heights for PFP than for CuPc. Most surprisingly, instead of leveling to increase hydrogen bond interactions, the height difference is enhanced in mixed layers as compared to the heights found in single component CuPc and PFP layers, resulting in an overall reduced interaction with the underlying substrate. The influence of the increased height of PFP on the interface dipole is investigated through work function measurements.

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Section: Resultsmentioning

confidence: 99%

Self-Assembly of Bicomponent Molecular Monolayers: Adsorption Height Changes and Their Consequences

et al. 2014

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“…However, the lack of larger crystalline clusters, which must be necessarily present to obtain a LEED 20 Its parameters change from a = 15.5 Å and b = 17.6 Å (with a parallel to the [−110] direction), for low temperature measurements and submonolayer coverage, to a = 14.2 Å and b = 13.5 Å for room temperature measurements and full monolayer coverage. 20 In contrast, at room temperature Buchholz and Somorjai observed by LEED an oblique unit cell with parameters a = 12.6 ± 0.5 Å, b = 12.6 ± 0.5 Å, and γ = 85 • , with the a axis oriented 8 • off the [−110] and equivalent directions. 18 Our STM measurements unambiguously reveal the presence of six equivalent domains (three rotational and three mirror domains).…”

Section: Resultsmentioning

confidence: 99%

Copper-phthalocyanine based metal–organic interfaces: The effect of fluorination, the substrate, and its symmetry

Oteyza

El-Sayed

Garcı́a-Lastra

et al. 2010

The Journal of Chemical Physics

110

129

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Metal–organic interfaces based on copper-phthalocyanine monolayers are studied in dependence of the metal substrate (Au versus Cu), of its symmetry [hexagonal (111) surfaces versus fourfold (100) surfaces], as well as of the donor or acceptor semiconducting character associated with the nonfluorinated or perfluorinated molecules, respectively. Comparison of the properties of these systematically varied metal–organic interfaces provides new insight into the effect of each of the previously mentioned parameters on the molecule–substrate interactions.

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“…But in Sn-down orientation the induced quadrupole moment already prevails and leads to intermolecular attraction, indicated by the formation of molecular chains similar to CuPc/Cu(111). 18 These investigations demonstrate the interrelation of intermolecular interaction (attraction or repulsion), strength of the bonding of the molecules to the substrate (physisorption or chemisorption), and the effects which are responsible for the lateral structure formation (adsorption sites, steric conditions, etc. ).…”

Section: Introductionmentioning

confidence: 96%

“…In particular, model systems like perylene and related molecules [the most popular one is perylene-3,4,9,10-tetracarboxylic-dianhydride (PTCDA)], [5][6][7][8][9][10][11][12][13][14] but also the (metal-) phthalocyanines (MePc) and similar molecules were in the focus of many experimental and theoretical studies. [15][16][17][18][19][20][21] One important goal of such studies was the investigation of the metal-organic interface. Its geometric properties are crucial for further growth of multilayer films, for the film morphology, but also for electronic properties like valence level alignment, band bending, etc.…”

Section: Introductionmentioning

confidence: 99%

“…33 Below 0.76 ML, this is indicated by the formation of chains that were observed in LT scanning tunneling microscopy (STM). 18 At higher coverage, CuPc shows "conventional" island growth in a centered orthorhombic superstructure with two molecules per unit cell. The intermolecular attraction was explained by a breaking of the fourfold symmetry of the molecule due to charge transfer, which induces a quadrupole moment in the molecules.…”

Section: Introductionmentioning

confidence: 99%

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Normal-incidence x-ray standing-wave study of copper phthalocyanine submonolayers on Cu(111) and Au(111)

et al. 2011

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Understanding the adsorption and growth mechanisms of large π -conjugated molecules on noble metal surfaces is a crucial aspect for designing and optimizing electronic devices based on organic materials. The investigation of adsorption heights for these molecules on different surfaces can be a direct measure for the strength of the adsorbate-substrate interaction, and gives insight into the fundamental bonding mechanisms. However, the adsorption strength is often also influenced by intermolecular (lateral) interactions which cause, e.g., island formation in the submonolayer regime and influence the adsorption geometry of individual molecules. The lateral structure can then dominate the vertical structure formation and influence the adsorbate-substrate interaction. In this context, the adsorption of copper-phthalocyanines on noble metal surfaces [Au(111), Ag(111), and Cu (111)] represents an ideal model system since the lateral structure formation, as well as the molecular adsorption geometries, strongly depend on coverage and temperature, and hence can be tuned easily. We demonstrate that for CuPc/Au(111), a system dominated by physisorption, the adsorption height of the molecules is independent from the lateral adsorption geometry. In contrast, a strong chemisorption of CuPc on Cu(111) shows a clear gradient in the interaction strength: Individual molecules in diluted phases are significantly stronger bonded than molecules in dense phases. This finding quantifies the increase of the exchange correlation in the binding process, which goes along with the tendency to a more site-specific adsorption geometry at small coverages.

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Substrate-induced symmetry reduction of CuPc on Cu(111): An LT-STM study

Cited by 75 publications

References 28 publications

Self-Assembly of Bicomponent Molecular Monolayers: Adsorption Height Changes and Their Consequences

Self-Assembly of Bicomponent Molecular Monolayers: Adsorption Height Changes and Their Consequences

Copper-phthalocyanine based metal–organic interfaces: The effect of fluorination, the substrate, and its symmetry

Normal-incidence x-ray standing-wave study of copper phthalocyanine submonolayers on Cu(111) and Au(111)

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