Epitaxial order of pentacene on Cu(110)–(2×1)O: One dimensional alignment induced by surface corrugation

Koini, Markus; Haber, Thomas; Werzer, Oliver; Berkebile, Stephen; Koller, Georg; Oehzelt, Martin; Ramsey, Michael G.; Resel, Roland

doi:10.1016/j.tsf.2008.06.053

Cited by 33 publications

(33 citation statements)

References 41 publications

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“…This example shows that besides the well known 2-dimensional lattice matching also other mechanisms exist which can induce organic epitay. The effect of surface corrugations to the epitaxial order of rod-like molecules is also observed on inorganic surfaces which show comparable strong corrugation like oxygen reconstructed TiO 2 (110) and Cu(110)(2x1)O [25,30], but also systems with weak surface corrugation depth [e.g. KCl(110)] show a clear effect on the epitaxial order [24].…”

Section: Resultsmentioning

confidence: 78%

Epitaxially grown sexiphenyl nanocrystals on the organic KAP(010) surface

Haber

Resel

Thierry

et al. 2008

Physica E: Low-dimensional Systems and Nanostructures

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1 Abstract: Nanocrystals of the organic molecule sexiphenyl are grown on the (010) cleavage plane of potassium hydrogen phthalate (KAP). The single crystalline organic surface is composed exclusively by phenyl rings and displays two distinct directions of aromatic rows forming surface corrugations. Sexiphenyl crystals grow epitaxially ordered with the (20-3) plane parallel to KAP(010) with the long molecular axes of the molecule aligned along one specific surface corrugation; empirical force field calculations confirm the experimentally observed epitaxial alignment of the sexiphenyl crystals. The sexiphenyl crystals grow as elongated islands, which can be shown to be of single crystalline nature.

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Section: Resultsmentioning

confidence: 78%

Epitaxially grown sexiphenyl nanocrystals on the organic KAP(010) surface

Haber

Resel

Thierry

et al. 2008

Physica E: Low-dimensional Systems and Nanostructures

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“…4,5 Recently, Koini et al reported an influence of the surface corrugation of weakly interacting oxygen-passivated Cu͑100͒ single crystals on the morphology pattern of pentacene films. 18 These authors observed preferential alignment of the pentacene molecules with the long crystal axis, c, along the surface corrugation due to the presence of the oxygen atoms. In analogy, the filamentlike island morphology of the Pc films on SCD͑100͒-͑2 ϫ 1͒ : H surface can be assigned to the influence of surface corrugation of the H-terminated diamond due to the presence of the dimer rows.…”

Section: Resultsmentioning

confidence: 98%

“…This also has been observed for Pc on HOPG, 20 gold, 5 and oxygen-passivated copper surfaces. 18 Furthermore, the ͑00l͒ reflex is split, which suggests the presence of different pentacene polymorphs. The d 00l spacing ͑d =2 / q: d 00l = 15.4 and 14.5 Å, respectively͒ indicates the presence of a bulk phase and a thin-film phase polymorph.…”

Section: Resultsmentioning

confidence: 99%

Photoresponse and morphology of pentacene thin films modified by oxidized and reduced diamond surfaces

et al. 2009

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Because of its large band gap and variety of stable surface terminations, diamond is a suitable material to study the optical and electronic properties of organic films. Optical absorption and photocurrent experiments with pentacene on hydrogen-and oxygen-terminated diamond surfaces reveal a strong, polarization-dependent photoresponse of pentacene films. The diamond surface reconstruction as well as the molecule-surface interactions influence the morphology and the molecular structure of the films, causing the associated polarization dependence. On oxygen-terminated diamond, the pentacene thin-film phase typical for electronically inert substrates such as SiO 2 is formed. On hydrogen-terminated diamond, on the other hand, a three-dimensional growth mode of a filamentlike pentacene morphology is observed by atomic force microscopy, with pentacene molecules arranged with their long molecular axis oriented along the hydrogen-terminated diamond surface, as confirmed by x-ray diffraction. Furthermore, on hydrogen-terminated single crystalline diamond, the b axis of the pentacene unit cell is found to orient preferentially perpendicular to the surface, in agreement with photocurrent and optical-absorption experiments.

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“…However, it is not possible to give a clear picture about the structure at the interface between {11-2} sexiphenyl and (001) muscovite . The regulatory role of surface corrugations to form epitaxially ordered crystallites is observed also for surfaces with strong surface corrugations like sexiphenyl on TiO 2 (110), [26] and pentacene and sexithiophene on Cu(110)(2 × 1)O, [42,43] but also for surfaces with weak surface corrugations like sexiphenyl on KCl(100). [44 -46] …”

Section: Discussionmentioning

confidence: 97%

Origins for epitaxial order of sexiphenyl crystals on muscovite(001)

Resel

Haber

Lengyel

et al. 2009

Surface & Interface Analysis

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The epitaxial order of sexiphenyl crystals on muscovite(001) is investigated by x-ray diffraction, lattice misfit calculations and atomic force microscopy. Depending on the substrate temperature during the thin film growth process, different epitaxial orientations are formed. Sexiphenyl thin films prepared at 370 K preferentially form crystals with the crystallographic (11-1) planes parallel to the substrate surface while at 434 K a strong fraction of crystals with (11-2) orientations is grown. The epitaxial orders of sexiphenyl crystals are compared with lattice misfit calculations. The in-plane order of the {11-1} crystals can be explained by a point-on-line coincidence I, which reveals that the interface is formed by undisturbed crystal surfaces. The epitaxial order of the {11-2} oriented crystals is characterised by the experimental observation that low indexed crystal directions in the sexiphenyl(11-2) plane and the muscovite(001) surface coincide with each other, forming a near-coincidence case. Corrugations of the substrate surface are responsible for this second type of epitaxial order. Characteristic features in the thin film morphology could be correlated to the two observed epitaxial orientations of the sexiphenyl crystals.

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Epitaxial order of pentacene on Cu(110)–(2×1)O: One dimensional alignment induced by surface corrugation

Cited by 33 publications

References 41 publications

Epitaxially grown sexiphenyl nanocrystals on the organic KAP(010) surface

Epitaxially grown sexiphenyl nanocrystals on the organic KAP(010) surface

Photoresponse and morphology of pentacene thin films modified by oxidized and reduced diamond surfaces

Origins for epitaxial order of sexiphenyl crystals on muscovite(001)

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