Initial stages of a<i>para</i>-hexaphenyl film growth on amorphous mica

Potocar, Thomas; Lorbek, Stefan; Nabok, Dmitrii; Shen, Quan; Tumbek, Levent; Hlawacek, Gregor; Puschnig, Peter; Draxl, Claudia; Teichert, Christian; Winkler, Adolf

doi:10.1103/physrevb.83.075423

Cited by 67 publications

(134 citation statements)

References 53 publications

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“…Typically sizes between 2 and 4 are found for different rodlike molecules. For 5A on SiO 2 , a value of 3-4 is reported [9,63] similar to 2-3 reported for 6P on disordered mica(0001) substrates [62]. However, due to the large experimental data set necessary, in many studies also scaling laws are used to determine the critical nucleus size.…”

Section: Obtaining the Critical Island Sizementioning

confidence: 92%

“…However, capture zone scaling [59][60][61] seems to provide more reliable results [64][65][66] for some cases. In agreement with rate theory, scaling laws typically yield values between 2 and 3 for 6P [62,64] and somewhat higher values between 3 and 6 for 5A [8,9,11] on SiO 2 or cyclohexane terminated Si{001} [67]. However, in particular for the growth of 5A care has to be taken with respect to the applicability of these single shot methods because of fractal growth morphologies [68].…”

Section: Obtaining the Critical Island Sizementioning

confidence: 95%

“…However, common values obtained from TDS (experimental and theoretical) are in the order of 1 × 10 17 [47,48,[69][70][71][72][73][74]. Recent rate equation analysis yields a value of 2 × 10 17 for the diffusion of 6P on mica [62]. The explanation of these high values is given by transition state theory [75].…”

Section: Obtaining the Critical Island Sizementioning

confidence: 99%

“…An assessment of the quality of the recorded data and the relevance of the extracted data can be obtained by comparing the results from the two different methods [5,62] …”

Section: Obtaining the Critical Island Sizementioning

confidence: 99%

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Nucleation and growth of thin films of rod-like conjugated molecules

Hlawacek

Teichert

2013

J. Phys.: Condens. Matter

107

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Abstract. Thin films formed from small molecules rapidly gain importance in different technological fields. To explain their growth, methods developed for zero-dimensional atoms as the film forming particles are applied. However, in organic thin film growth the dimensionality of the building blocks comes into play. Using the special case of the model molecule para-Sexiphenyl, we will emphasize the challenges that arise from the anisotropic and one-dimensional nature of building blocks. Differences or common features with other rodlike molecules will be discussed. The typical morphologies encountered for this group of molecules and the relevant growth modes will be investigated. Special attention is given to the transition between flat lying and upright orientation of the building blocks during nucleation. We will further discuss methods to control the molecular orientation and describe the involved diffusion processes qualitatively and quantitatively.

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Section: Obtaining the Critical Island Sizementioning

confidence: 92%

Section: Obtaining the Critical Island Sizementioning

confidence: 95%

Section: Obtaining the Critical Island Sizementioning

confidence: 99%

“…An assessment of the quality of the recorded data and the relevance of the extracted data can be obtained by comparing the results from the two different methods [5,62] …”

Section: Obtaining the Critical Island Sizementioning

confidence: 99%

See 2 more Smart Citations

Nucleation and growth of thin films of rod-like conjugated molecules

Hlawacek

Teichert

2013

J. Phys.: Condens. Matter

107

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“…Therefore, various recent studies have attempted to investigate 6P-substrate systems by atomistic molecular dynamics (MD), where the molecules and substrates are modelled with atomic resolution, but the dynamics is determined by classical force fields. An example is the study by Potocar et al who consider the transition from lying small clusters to the upright larger clusters of 6P molecules [23] at 6P crystalline surfaces. We also mention recent MD simulations of 6P bulk crystals [24] and organic-organic heterosurfaces involving 6P [25].…”

Section: Introductionmentioning

confidence: 99%

A scale-bridging modeling approach for anisotropic organic molecules at patterned semiconductor surfaces

Kleppmann

Klapp

2015

The Journal of Chemical Physics

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Hybrid systems consisting of organic molecules at inorganic semiconductor surfaces are gaining increasing importance as thin film devices for optoelectronics. The efficiency of such devices strongly depends on the collective behavior of the adsorbed molecules. In the present paper we propose a novel, coarse-grained model addressing the condensed phases of a representative hybrid system, that is, para-sexiphenyl (6P) at zinc-oxide (ZnO). Within our model, intermolecular interactions are represented via a Gay-Berne potential (describing steric and van-der-Waals interactions) combined with the electrostatic potential between two linear quadrupoles. Similarly, the molecule-substrate interactions include a coupling between a linear molecular quadrupole to the electric field generated by the line charges characterizing ZnO(10-10). To validate our approach, we perform equilibrium Monte Carlo simulations, where the lateral positions are fixed to a 2D lattice, while the rotational degrees of freedom are continuous. We use these simulations to investigate orientational ordering in the condensed state. We reproduce various experimentally observed features such as the alignment of individual molecules with the line charges on the surface, the formation of a standing uniaxial phase with a herringbone structure, as well as the formation of a lying nematic phase.

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Early Stage Growth Process of Dinaphtho[2,3‐b:2',3'‐f]thieno[3,2‐b]thiophene (DNTT) Thin Film

Hiroshiba

Kawano

Ongko

et al. 2023

Physica Status Solidi (a)

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The early stage growth of dinaphtho[2,3‐b:2',3'‐f]thieno[3,2‐b]thiophenes (DNTTs) thin films are investigated using grazing incidence X‐ray diffraction (GIXD) and surface morphology analysis using atomic force microscopy (AFM). The thin‐film growth conditions are controlled using a slow deposition method. The vertical orientation of DNTT is confirmed from the growth of the first layer using GIXD. The morphologies of the first‐layer grains are universal in the growth rate range of 0.155–0.017 ML min−1. In addition, the dependence of the nuclei density on the deposition flow rate indicates that two molecules (dimers) are required for nucleation. This result suggests that fewer molecules are sufficient for nucleation in the case of DNTT compared to pentacene thin film growth on SiO2.

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Initial stages of apara-hexaphenyl film growth on amorphous mica

Cited by 67 publications

References 53 publications

Nucleation and growth of thin films of rod-like conjugated molecules

Nucleation and growth of thin films of rod-like conjugated molecules

A scale-bridging modeling approach for anisotropic organic molecules at patterned semiconductor surfaces

Early Stage Growth Process of Dinaphtho[2,3‐b:2',3'‐f]thieno[3,2‐b]thiophene (DNTT) Thin Film

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