Thin film growth of aromatic rod-like molecules on graphene

Kratzer, Markus; Teichert, Christian

doi:10.1088/0957-4484/27/29/292001

Cited by 21 publications

(30 citation statements)

References 171 publications

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“…Now, two bright lines within a single pair are separated from each other by around 10 • , whereas the Gr armchair directions run along the angle bisector between them. These bright lines match very well the prediction that the LNA directions are split by ±5 • from an armchair direction 32,49 .…”

Section: A Epitaxial Relationssupporting

confidence: 84%

“…In this case, it has been reported earlier that 6P molecules align with their LMA ±11 • rotated from an armchair direction of Gr (graphite) 33,49 . The packing motif at the surface then closely resembles the (111) plane of bulk 6P 33 , thus resulting in a total of six LNA direc-tions split by ±5 • also from an armchair direction 32,49 . Fig.…”

Section: A Epitaxial Relationsmentioning

confidence: 94%

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Molecules on rails: friction anisotropy and preferential sliding directions of organic nanocrystallites on two-dimensional materials

et al. 2018

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Two-dimensional (2D) materials are envisaged as ultra-thin solid lubricants for nano-mechanical systems. So far, their frictional properties at the nanoscale have been studied by standard friction force microscopy. However, lateral manipulation of nanoparticles is a more suitable method to study the dependence of friction on the crystallography of two contacting surfaces. Still, such experiments are lacking. In this study, we combine atomic force microscopy (AFM) based lateral manipulation and molecular dynamics simulations in order to investigate the movements of organic needle-like nanocrystallites grown by van der Waals epitaxy on graphene and hexagonal boron nitride. We observe that nanoneedle fragments -when pushed by an AFM tip -do not move along the original pushing directions. Instead, they slide on the 2D materials preferentially along the needles' growth directions, which act as invisible rails along commensurate directions. Further, when the nanocrystallites were rotated by applying a torque with the AFM tip across the preferential sliding directions, we find an increase of the torsional signal of the AFM cantilever. We demonstrate in conjunction with simulations that both, the significant friction anisotropy and preferential sliding directions are determined by the complex epitaxial relation and arise from the commensurate and incommensurate states between the organic nanocrystallites and the 2D materials. arXiv:1810.00756v1 [cond-mat.mes-hall]

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Section: A Epitaxial Relationssupporting

confidence: 84%

Section: A Epitaxial Relationsmentioning

confidence: 94%

Molecules on rails: friction anisotropy and preferential sliding directions of organic nanocrystallites on two-dimensional materials

et al. 2018

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“…Recently, two-dimensional (2D) van der Waals (vdW) materials6 have been proposed as substrates for the epitaxy of organic molecules5789101112. Their key advantage lies in the fact that these interfaces have vdW nature13, meaning that surfaces on which OSCs grow are atomically smooth with no dangling bonds and trapped charges at the interface.…”

mentioning

confidence: 99%

Epitaxy of highly ordered organic semiconductor crystallite networks supported by hexagonal boron nitride

Matković

Genser

Lüftner

et al. 2016

Sci Rep

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This study focuses on hexagonal boron nitride as an ultra-thin van der Waals dielectric substrate for the epitaxial growth of highly ordered crystalline networks of the organic semiconductor parahexaphenyl. Atomic force microscopy based morphology analysis combined with density functional theory simulations reveal their epitaxial relation. As a consequence, needle-like crystallites of parahexaphenyl grow with their long axes oriented five degrees off the hexagonal boron nitride zigzag directions. In addition, by tuning the deposition temperature and the thickness of hexagonal boron nitride, ordered networks of needle-like crystallites as long as several tens of micrometers can be obtained. A deeper understanding of the organic crystallites growth and ordering at ultra-thin van der Waals dielectric substrates will lead to grain boundary-free organic field effect devices, limited only by the intrinsic properties of the organic semiconductors.

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“…Therefore, the graphene template can enable epitaxial growth of highly crystalline OSC thin films. [8] In addition, these interactions can easily be tuned by controlling the electronic properties of graphene, [9,10] so graphene templates offer a facile and direct approach to prepare graphene-OSC heterostructures with desirable interfacial properties. However, despite the great potential of graphene-OSC heterostructures, only a few studies of OSCs' growth behavior on electronicstates-controlled graphene have been reported.…”

Section: Doi: 101002/advs201902315mentioning

confidence: 99%

Charge‐Transfer‐Controlled Growth of Organic Semiconductor Crystals on Graphene

et al. 2020

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Controlling the growth behavior of organic semiconductors (OSCs) is essential because it determines their optoelectronic properties. In order to accomplish this, graphene templates with electronic‐state tunability are used to affect the growth of OSCs by controlling the van der Waals interaction between OSC ad‐molecules and graphene. However, in many graphene‐molecule systems, the charge transfer between an ad‐molecule and a graphene template causes another important interaction. This charge‐transfer‐induced interaction is never considered in the growth scheme of OSCs. Here, the effects of charge transfer on the formation of graphene–OSC heterostructures are investigated, using fullerene (C60) as a model compound. By in situ electrical doping of a graphene template to suppress the charge transfer between C60 ad‐molecules and graphene, the layer‐by‐layer growth of a C60 film on graphene can be achieved. Under this condition, the graphene–C60 interface is free of Fermi‐level pinning; thus, barristors fabricated on the graphene–C60 interface show a nearly ideal Schottky–Mott limit with efficient modulation of the charge‐injection barrier. Moreover, the optimized C60 film exhibits a high field‐effect electron mobility of 2.5 cm2 V−1 s−1. These results provide an efficient route to engineering highly efficient optoelectronic graphene–OSC hybrid material applications.

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Thin film growth of aromatic rod-like molecules on graphene

Cited by 21 publications

References 171 publications

Molecules on rails: friction anisotropy and preferential sliding directions of organic nanocrystallites on two-dimensional materials

Molecules on rails: friction anisotropy and preferential sliding directions of organic nanocrystallites on two-dimensional materials

Epitaxy of highly ordered organic semiconductor crystallite networks supported by hexagonal boron nitride

Charge‐Transfer‐Controlled Growth of Organic Semiconductor Crystals on Graphene

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