C6 cyclic hydrocarbons adsorbed on Si(001) as an interface buffer for organic-film fabrication

Wakatsuchi, Masayuki; Kato, Hiroyuki; Fujisawa, H.; Kawai, Maki

doi:10.1016/j.elspec.2004.02.053

Cited by 11 publications

(30 citation statements)

References 17 publications

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“…However, these larger grains are likely due to a much slower deposition rate. 26 In comparing growth on COD/Si with that on a saturated molecular layer of cyclohexene (which, after bonding to the surface, has only fully saturated bonds), 7,17 we see that the grain sizes of 50-100 µm in this study are similar. This result leads us to conclude that the exposed CdC bond of COD does not significantly alter the growth of pentacene, as compared to a similar rigid layer containing only fully saturated bonds.…”

Section: Growthsupporting

confidence: 54%

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Epitaxial Growth of Large Pentacene Crystals on Si(001) Surfaces Functionalized with Molecular Monolayers

2007

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The nucleation and growth of pentacene thin films are controlled largely by the energies associated with the interfaces. We have used low-energy electron microscopy (LEEM) and photoemission electron microscopy (PEEM) to investigate the nucleation and growth of pentacene thin films on Si(001) surfaces modified with two different molecular monolayers. Clean Si(001)-(2 × 1) surfaces were modified with either 1,5-cyclooctadiene or 1-dodecene prior to pentacene growth to study the effects of exposed π bonds at the interface, orientation of those π bonds relative to each other, and rigidity of the molecular layer on pentacene nucleation, growth, and crystalline orientation. Both molecular monolayers weaken the substrate-pentacene interaction sufficiently to allow for low pentacene nucleation density and good pentacene diffusion, leading to the growth of pentacene grains as large as 100 µm. Pentacene grows epitaxially on both functionalized surfaces, adopting an orthorhombic unit cell that follows the orientation of the underlying Si surface reconstruction. Our results show that in addition to improving the ultimate size of pentacene crystals, molecular monolayers are able to impose the substrate orientation on pentacene nuclei and thereby control the crystalline orientation of the thin film.

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Section: Growthsupporting

confidence: 54%

“…26 Like 1,4-cyclohexadiene, the COD molecule contains two unsaturated bonds and has also been shown to retain one of these bonds upon adsorption. 34 Using PEEM, we find that pentacene on COD/Si has significantly larger grains than was observed in the 1,4-cyclohexadiene study.…”

Section: Growthmentioning

confidence: 98%

Epitaxial Growth of Large Pentacene Crystals on Si(001) Surfaces Functionalized with Molecular Monolayers

2007

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“…Experimental surface science approaches to studying hydrocarbons at interfaces include electron energy loss spectroscopy , and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), − which are utilized to characterize surface species on flat oxide surfaces. Raman spectroscopy ,, and transmission IR spectroscopy ,− have overcome the transparency and reflectivity barrier and are used for investigating the adsorption of hydrocarbons on high-surface-area powders.…”

Section: Introductionmentioning

confidence: 99%

“…101 In extending their work to liquid/R-alumina interfaces, they proposed that alkanes form an ordered layer consisting of hydrocarbon molecules arranged parallel to the surface under the disordered bulk. 104 Experimental surface science approaches to studying hydrocarbons at interfaces include electron energy loss spectroscopy 105,106 and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), [107][108][109] which are utilized to characterize surface species on flat oxide surfaces. Raman spectroscopy 74,110,111 and transmission IR spectroscopy 76,[112][113][114][115] have overcome the transparency and reflectivity barrier and are used for investigating the adsorption of hydrocarbons on high-surface-area powders.…”

Section: Introductionmentioning

confidence: 99%

Pentane, Hexane, Cyclopentane, Cyclohexane, 1-Hexene, 1-Pentene,cis-2-Pentene, Cyclohexene, and Cyclopentene at Vapor/α-Alumina and Liquid/α-Alumina Interfaces Studied by Broadband Sum Frequency Generation

2009

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The molecular orientation and structure of adsorbates at oxide interfaces is driven by surface-molecule and molecule-molecule interactions and is useful for predicting reactivity and product selectivity in heterogeneous chemical reactions, including those important in catalytic processes. Using broadband vibrational sum-frequency generation spectroscopy, we probed cyclic and acyclic alkanes and olefins at buried vapor/solid and liquid/ solid interfaces of the R-alumina (0001) surface under ambient conditions. The spectroscopic signatures of the adsorbates were measured and compared with bulk phase spectra and spectra of model surfaces containing hydrocarbons covalently linked to glass slides using silane chemistry. By utilizing appropriate polarization combinations, the orientations of hydrocarbons adsorbed from the vapor were evaluated and compared to the hydrocarbon orientations at the liquid/solid interface. The data support a proposed orientation for n-alkanes and cycloalkanes at the liquid/solid interface in which the hydrocarbons lie with the planes of their carbon backbones parallel to the surface, whereas at the vapor/solid interface, the adsorbates are oriented with their carbon backbones in an orientation neither parallel nor perpendicular to the surface. The surface vibrational spectra of olefins at both types of interfaces indicate that their orientations differ from saturated counterparts, and their unique spectral signatures allow differentiation of adsorbed olefins from alkanes.

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“…Early experimental studies of 1,4-cyclohexadiene adsorption on Si(001)-2 × 1 by photoelectron spectroscopy, vibrational spectroscopy and scanning tunneling microscopy (STM) revealed the existence of the only adsorption configuration that was a di-σ complex [18,[35][36][37]. Later, the existence of a more thermodynamically stable tetra-σ complex wherein the molecule was adsorbed between the two Si\Si dimers was predicted using the DFT calculations [23].…”

Section: Introductionmentioning

confidence: 96%

Modeling of 1,4-cyclohexadiene adsorption thermodynamics on Si(001)-2 × 1 surface

et al. 2015

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C6 cyclic hydrocarbons adsorbed on Si(001) as an interface buffer for organic-film fabrication

Cited by 11 publications

References 17 publications

Epitaxial Growth of Large Pentacene Crystals on Si(001) Surfaces Functionalized with Molecular Monolayers

Epitaxial Growth of Large Pentacene Crystals on Si(001) Surfaces Functionalized with Molecular Monolayers

Pentane, Hexane, Cyclopentane, Cyclohexane, 1-Hexene, 1-Pentene,cis-2-Pentene, Cyclohexene, and Cyclopentene at Vapor/α-Alumina and Liquid/α-Alumina Interfaces Studied by Broadband Sum Frequency Generation

Modeling of 1,4-cyclohexadiene adsorption thermodynamics on Si(001)-2 × 1 surface

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