Deposition Sequence Determines Morphology of C<sub>60</sub> and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF<sub>2</sub>(111)

Loske, Felix; Reichling, Michael; Kühnle, Angelika

doi:10.1143/jjap.50.08lb07

Cited by 4 publications

(5 citation statements)

References 26 publications

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“…In particular, the investigation of adsorbed molecules on insulating substrates was finally reported which has an undeniable interest for molecular electronics. Various organic molecules such as perylene tetracarboxylic dianhydride molecule (PTCDA) [19,20] or C 60 [21][22][23][24][25][26][27] were first investigated and, rapidly, new strategies for the development of extended organic self-assemblies have been employed like the nanopatterning on insulating substrates with electron beam [28,29] or adequate functionalizations of molecules to enhance the molecule-substrate or molecule-molecule interactions [30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

High-resolution imaging of C₆₀molecules using tuning-fork-based non-contact atomic force microscopy

Pawlak¹,

Kawai²,

Fremy³

et al. 2012

J. Phys.: Condens. Matter

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Recent advances in non-contact atomic force microscopy (nc-AFM) have led to the possibility of achieving unprecedented resolution within molecular structures, accomplished by probing short-range repulsive interaction forces. Here we investigate C(60) molecules adsorbed on KBr(111) and Cu(111) by tuning-fork-based nc-AFM. First, measurements of C(60) deposited on KBr(001) were conducted in cryogenic conditions revealing highly resolved nc-AFM images of the self-assembly. Using constant-frequency shift mode as well as three-dimensional spectroscopic measurements, we observe that the relatively weak molecule-substrate interaction generally leads to the disruption of molecular assembled structures when the tip is probing the short-range force regime. This particular issue hindered us in resolving the chemical structure of this molecule on the KBr surface. To obtain a better anchoring of C(60) molecules, nc-AFM measurements were performed on Cu(111). Sub-molecular resolutions within the molecules was achieved which allowed a direct and unambiguous visualization of their orientations on the supporting substrate. Furthermore, three-dimensional spectroscopic measurements of simultaneous force and current have been performed above the single molecules giving information of the C(60) molecular orientation as well as its local conductivity. We further discuss the different imaging modes in nc-AFM such as constant-frequency shift nc-AFM, constant-height nc-AFM and constant-current nc-AFM as well as three-dimensional spectroscopic measurement (3D-DFS) employed to achieve such resolution at the sub-molecular scale.

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Section: Introductionmentioning

confidence: 99%

High-resolution imaging of C₆₀molecules using tuning-fork-based non-contact atomic force microscopy

Pawlak¹,

Kawai²,

Fremy³

et al. 2012

J. Phys.: Condens. Matter

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“…The heterostructure islands in Figure 1b differ from the morphology previously observed for PTCDI and C 60 codeposited on calcium fluoride (CaF 2 ), where dewetting from the substrate leads to smaller multilayered PTCDI islands with more complicated island morphologies. 34 A significant difference in our work is the much larger, flat monolayer PTCDI islands that can be formed on hBN; these allow the kinetically limited growth of C 60 islands without a dominant contribution to nucleation from sites such as PTCDI step edges.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

Two-Dimensional Diffusion of Excitons in a Perylene Diimide Monolayer Quenched by a Fullerene Heterojunction

et al. 2019

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The structural and functional properties of organic heterojunctions play a vitally important role in the operation of organic devices, but their properties are difficult to measure directly due to the buried interfaces that are typically formed. We have grown model heterojunctions consisting of two monolayer-thick organic semiconductors and used these bilayers to explore the two-dimensional dynamics of excitons. The heterostructures are formed by sequential deposition of monolayers of perylene-3,4,9,10-tetracarboxylic-3,4,9,10-diimide (PTCDI) and fullerene (C60) on hexagonal boron nitride (hBN). The morphology of these bilayers was characterized using atomic force microscopy and showed clear differences in the C60 growth kinetics on hBN and PTCDI. The variation in the fluorescence of PTCDI-C60 heterostructures with increasing fullerene coverage showed a reduction in intensity consistent with exciton diffusion and quenching. We use a simple model for the intensity dependence to determine the two-dimensional exciton diffusion length in a PTCDI monolayer, finding a value of 17 ± 3 nm for this parameter.

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“…Prominent insulating support materials for molecular assemblies are stable cleavage planes of alkali halides [48,, such as KBr(001), NaCl(001), KCl(001) or RbCl(001), the (111) cleavage plane of the fluoride CaF 2 [53,[82][83][84][85], oxide surfaces such as MgO(001) or Al 2 O 3 (001) [55] as well as diamond and mica [86] surfaces. Recently, the calcite(104) surface [49,[87][88][89][90][91][92][93][94][95][96][97][98] has gained increasing attention for reasons discussed later.…”

Section: Special Situation On Insulator Surfacesmentioning

confidence: 99%

Self-assembly of Organic Molecules on Insulating Surfaces

Kling

Bechstein

Rahe

et al. 2015

Noncontact Atomic Force Microscopy

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Molecular self-assembly is known to provide a powerful tool for creating functional structures, with the ultimate structure and functionality encoded in the molecular building blocks. Upon molecule deposition onto surfaces, functional structures have been created ranging from defect-free, highly symmetric two-dimensional layers to complex assemblies with dedicated functionality. Especially organic molecules play a key role for molecular self-assembly due to their impressive structural flexibility and the high degree of control by chemical synthesis. Furthermore, the surface itself provides another exciting dimension: adjusting the subtle balance between intermolecular and molecule-surface interactions allows creating a broad variety of structures and explains the great success when confining molecular self-assembly to surfaces. While most of the structures realized so far have been fabricated on metallic substrates, comparatively little is known about molecular self-assembly on insulating surfaces. However, extending the materials basis to insulating substrates is of increasing interest to benefit from self-assembly strategies for emerging technologies such as molecular (opto)electronics. For the latter and further related applications, decoupling of the electronic structure from the underlying substrate is mandatory for the device functionality. Moreover, future applications will require the molecular structure to be stable at room temperature rather than at low temperatures. On insulating support surfaces, however, most attempts to create self-assembled molecular structures at room temperature have been hampered by the weak molecule-surface interactions. Thus, considerable effort has been made to establish means for increasing

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Deposition Sequence Determines Morphology of C₆₀ and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF₂(111)

Cited by 4 publications

References 26 publications

High-resolution imaging of C₆₀molecules using tuning-fork-based non-contact atomic force microscopy

High-resolution imaging of C₆₀molecules using tuning-fork-based non-contact atomic force microscopy

Two-Dimensional Diffusion of Excitons in a Perylene Diimide Monolayer Quenched by a Fullerene Heterojunction

Self-assembly of Organic Molecules on Insulating Surfaces

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Deposition Sequence Determines Morphology of C60 and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF2(111)

Cited by 4 publications

References 26 publications

High-resolution imaging of C60molecules using tuning-fork-based non-contact atomic force microscopy

High-resolution imaging of C60molecules using tuning-fork-based non-contact atomic force microscopy

Two-Dimensional Diffusion of Excitons in a Perylene Diimide Monolayer Quenched by a Fullerene Heterojunction

Self-assembly of Organic Molecules on Insulating Surfaces

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Product

Resources

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Deposition Sequence Determines Morphology of C₆₀ and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF₂(111)

High-resolution imaging of C₆₀molecules using tuning-fork-based non-contact atomic force microscopy

High-resolution imaging of C₆₀molecules using tuning-fork-based non-contact atomic force microscopy