Epitaxial growth of sexithiophene on mica surfaces

Simbrunner, Clemens; Hernandez‐Sosa, Gerardo; Oehzelt, Martin; Djuric, Tatjana; Salzmann, Ingo; Brinkmann, Martin; Schwabegger, Günther; Watzinger, Irene; Sitter, H.; Resel, Roland

doi:10.1103/physrevb.83.115443

Cited by 38 publications

(91 citation statements)

References 36 publications

(51 reference statements)

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“…Therefore, the observation of three muscovite (202) peaks at 120 intervals indicates that there are three different configurations corresponding to an alternating stacking sequence of muscovite. 38 A similar result can be observed in the MoO 2 (022) plane as well. Monoclinic MoO 2 has a two-fold symmetry, and therefore the presence of six peaks in the U-scan of the (022) plane at 60 intervals reveals the co-existence of three sets of domains in the MoO 2 thin film.…”

Section: à4supporting

confidence: 71%

Van der Waals epitaxy of functional MoO2 film on mica for flexible electronics

Hao

Lin

Liu

et al. 2016

Applied Physics Letters

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Section: à4supporting

confidence: 71%

Van der Waals epitaxy of functional MoO2 film on mica for flexible electronics

Hao

Lin

Liu

et al. 2016

Applied Physics Letters

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“…Such freshly cleaved mica substrates have been particularly used to study the film growth of rod-like organic molecules, e.g., oligo-phenylenes, 1-4 oligo-acenes, 5 and oligo-thiophenes. 6,7 In most of these cases the ultra-thin films consist of needle-like islands, which are composed of molecules with their long axis parallel to the substrate surface. It is assumed that this particular film growth is stabilized by lateral electric fields existing on the surface of the freshly cleaved mica substrate.…”

Section: Introductionmentioning

confidence: 99%

The influence of potassium on the growth of ultra-thin films of para-hexaphenyl on muscovite mica(001)

Putsche

Tumbek

Winkler

2012

The Journal of Chemical Physics

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The interaction of potassium with mica(001) and its influence on the subsequent film growth of para-hexaphenyl (6P) was studied by Auger electron spectroscopy, thermal desorption spectroscopy, and atomic force microscopy (AFM). Freshly cleaved mica is covered with 0.5 monolayer (ML) of potassium. By intentional potassium deposition in ultra-high vacuum a saturation of 1 ML can be achieved, which is stable up to 1000 K. Additional potassium desorbs at around 350 K. The film morphology of 6P on mica(001) is significantly influenced by the potassium monolayer. On the freshly cleaved mica surface, which contains 1/2 ML of K, 6P forms needle-like islands which are composed of lying molecules. On the fully potassium covered mica surface 6P grows in form of dendritic islands, composed of standing molecules. The reason for this change is attributed to the removal of lateral electric fields which exist on the freshly cleaved mica surface, due to the specific arrangements of the atoms in the surface near region of mica.

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“…Domains are separated from each other by muscovite cleavage steps, hinting to a similar driving force for this epitaxial growth as for the formation of, e.g., nanofibers from para-hexaphenylene, from functionalized para-quaterphenylenes, 21 and from thiophene-phenylenes. [22][23][24][25] These vacuum-grown fibers and aggregates are to be compared to samples prepared via solution-based deposition, i.e. by dropcasting and by dip-coating.…”

Section: Resultsmentioning

confidence: 99%

Organic nanofibers from squarylium dyes: local morphology, optical, and electrical properties

et al. 2012

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Environmentally stable, non-toxic squarylium dyes with strong absorption maxima in the red and near infrared spectral region are known for almost fifty years. Despite the fact that their optoelectronic properties distinguish them as promising materials for organics based photovoltaic cells, they have regained attention only very recently. For their application in heterojunction solar cells knowledge of their nanoscopic morphology as well as nanoscopic electrical properties is paramount. In this paper thin films from two different squarylium dyes, from squarylium (SQ) and from hydroxy-squarylium (SQOH) are investigated. The thin films are either solution casted or vacuum sublimed onto substrates such as muscovite mica, which are known to promote self-assembly into oriented, crystalline nanostructures such as nanofibers. Local characterization is performed via (polarized) optical microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM).

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Epitaxial growth of sexithiophene on mica surfaces

Cited by 38 publications

References 36 publications

Van der Waals epitaxy of functional MoO2 film on mica for flexible electronics

Van der Waals epitaxy of functional MoO2 film on mica for flexible electronics

The influence of potassium on the growth of ultra-thin films of para-hexaphenyl on muscovite mica(001)

Organic nanofibers from squarylium dyes: local morphology, optical, and electrical properties

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