An STM investigation of the interaction and ordering of pentacene molecules on the Ag/Si(111)-(√3×√3)R30° surface

Guaino, Philippe; Cafolla, A.A.; Carty, D.; Sheerin, G.; Hughes, Greg

doi:10.1016/s0039-6028(03)00751-9

Cited by 38 publications

(23 citation statements)

References 27 publications

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“…Silver deposition on the Si(111)-(7 × 7) surface at elevated temperatures forms a ( [25][26][27][28]. At room temperature the clean Ag/Si(111)-( √ 3 × √ 3)R30 • surface is well described by the honeycomb-chain-trimer model.…”

Section: Resultsmentioning

confidence: 99%

“…This information can be obtained by using a combination of scanning tunnelling microscopy (STM) and scanning tunnelling spectroscopy (STS). STM is a highly local technique that has become a powerful tool for studying the adsorption geometry and the conformation and dynamics of single molecules and molecular assemblies on conducting substrates [20][21][22][23][24][25][26]. However, while these images elucidate the topographic structure of the interface, they provide little information about its electronic properties.…”

Section: Introductionmentioning

confidence: 99%

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X-ray Absorption and X-ray Magnetic Circular Dichroism Studies of a Monatomic Fe(001) Layer Facing a Single-Crystalline MgO(001) Tunnel Barrier

Miyokawa

Saito

Katayama

et al. 2004

jjap

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The room temperature growth and ordering of copper(II) 2,9,16,23-tetratert-butyl-phthalocyanine (CuTtertBuPc) molecules on the Ag/Si (111)3)R30 • surface have been investigated using scanning tunnelling microscopy/spectroscopy (STM/STS). Results indicate a well-ordered molecular layer in which the phthalocyanine molecules have a flat orientation with the molecular plane lying parallel to the substrate and forming a dimer structure on the surface. STS data obtained from one monolayer (ML) of the CuTtert-BuPc on the Ag/Si(111)-( √ 3 × √ 3)R30 • surface show excellent agreement with valence-band x-ray photoemission and x-ray absorption spectra taken from thin films of CuTtertBuPc (10-20 ML) prepared in situ on the clean Si(111) substrate. Combining the spectroscopy results it was found that the highest occupied molecular orbital (HOMO) of the CuTtertBuPc is the half-occupied MO of b 1g symmetry with mixed Cu 3d(x 2 -y 2 ) and ligand 2p character which was confirmed by density functional theory calculations and x-ray emission spectroscopy data.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

X-ray Absorption and X-ray Magnetic Circular Dichroism Studies of a Monatomic Fe(001) Layer Facing a Single-Crystalline MgO(001) Tunnel Barrier

Miyokawa

Saito

Katayama

et al. 2004

jjap

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“…[15][16][17][18][19][20][21]26 A square and two herringbone phases have been observed at submonolayer coverage of PTCDA on the Ag/ Si͑111͒-ͱ 3 ϫ ͱ 3 surface. The herringbone phase is generally observed on weakly interacting substrates and in multilayers of PTCDA.…”

Section: Discussionmentioning

confidence: 99%

STM studies of thin PTCDA films onAg∕Si(111)−3×3

2007

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Thin films of the large planar organic molecule 3,4,9,10-perylene tetracarboxylic dianhydride on the Ag/ Si͑111͒-ͱ 3 ϫ ͱ 3 surface have been studied by scanning tunneling microscopy. The coverage was between 0.3 and 10 monolayers. In submonolayers the molecules form two different phases with a commensurate relationship to the substrate: a herringbone phase and a square phase. Adsorption sites are determined for the square phase. Additional herringbone phases were also observed with other unit cell size or lower order in relation to the substrate. The molecules lie flat on the surface and form a full monolayer before multilayers are developed. Both the square and herringbone phases have been observed for the second layer. With more than 3 layers, islands were built up layer by layer in agreement with the ␣ bulk phase. On top of the islands there was always a herringbone structure.

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“…is an excellent substrate for growth of large molecules like pentacene and C 60 [15,16]. The structure of this reconstructed surface can be described by the so-called inequivalent triangle model (IET) [17].…”

Section: Introductionmentioning

confidence: 99%