Determination of critical island size in<i>para</i>-sexiphenyl islands on SiO<sub>2</sub>using capture-zone scaling

Lorbek, Stefan; Hlawacek, Gregor; Teichert, Christian

doi:10.1051/epjap/2011100428

Cited by 31 publications

(37 citation statements)

References 29 publications

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“…5 for upright standing molecules. This is also the value often reported in literature [62][63][64]. In figure 5, several possible configurations of critical nuclei from i * =0 to i * =4 are sketched.…”

Section: Obtaining the Critical Island Sizesupporting

confidence: 81%

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 Sizesupporting

confidence: 81%

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

Hlawacek

Teichert

2013

J. Phys.: Condens. Matter

107

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“…This proposal follows from the phenomenological argument that the CZD can be extracted from a Langevin equation representing the competition of neighboring islands for adatom aggregation. Several experimental works have already shown agreement of CZDs with the WS, such as growth of para-sexiphenyl islands 32,33 , Cu deposition with impurities 34 , pentacene island growth with impurities 35 , InAs quantum dot growth on GaAs 36 , and C 60 deposition on SiO 2 films 37 .…”

Section: Basic Definitions and Theoretical Approachesmentioning

confidence: 81%

Scaling in reversible submonolayer deposition

Reis

2013

Phys. Rev. B

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The scaling of island and monomer density, capture zone distributions (CZDs), and island size distributions (ISDs) in reversible submonolayer growth was studied using the Clarke-Vvedensky model. An approach based on rate-equation results for irreversible aggregation (IA) models is extended to predict several scaling regimes in square and triangular lattices, in agreement with simulation results. Consistently with previous works, a regime I with fractal islands is observed at low temperatures, corresponding to IA with critical island size i = 1, and a crossover to a second regime appears as the temperature is increased to ǫR 2/3 ∼ 1, where ǫ is the single bond detachment probability and R is the diffusion-to-deposition ratio. In the square (triangular) lattice, a regime with scaling similar to IA with i = 3 (i = 2) is observed after that crossover. In the triangular lattice, a subsequent crossover to an IA regime with i = 3 is observed, which is explained by the recurrence properties of random walks in two dimensional lattices, which is beyond the mean-field approaches. At high temperatures, a crossover to a fully reversible regime is observed, characterized by a large density of small islands, a small density of very large islands, and total island and monomer densities increasing with temperature, in contrast to IA models. CZDs and ISDs with Gaussian right tails appear in all regimes for R ∼ 10 7 or larger, including the fully reversible regime, where the CZDs are bimodal. This shows that the Pimpinelli-Einstein (PE) approach for IA explains the main mechanisms for the large islands to compete for free adatom aggregation in the reversible model, and may be the reason for its successful application to a variety of materials and growth conditions.

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“…[31,32] In the present case the detailed shape of the dendritic morphology depends on the cooling rate. Fractal dimension analysis [33] reveals for the emerging bilayer islands at the fast cooling rate a value of d = 1.9 AE 0.03, whereas the bilayer structure at low cooling rate has smaller fractal dimension (d = 1.7 AE 0.05). This can be related to the kinetically hindered diffusion of the molecules along the step edges of the bilayer islands in this case.…”

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confidence: 96%

Dynamics of Monolayer–Island Transitions in 2,7‐Dioctyl‐benzothienobenzthiophene Thin Films

et al. 2013

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The order in molecular monolayers is a crucial aspect for their technological application. However, the preparation of defined monolayers by spin-coating is a challenge, since the involved processes are far from thermodynamic equilibrium. In the work reported herein, the dynamic formation of dioctyl-benzothienobenzothiophene monolayers is explored as a function of temperature by using X-ray scattering techniques and atomic force microscopy. Starting with a disordered monolayer after the spin-coating process, post-deposition self-reassembly at room temperature transforms the initially amorphous layer into a well-ordered bilayer structure with a molecular herringbone packing, whereas at elevated temperature the formation of crystalline islands occurs. At the temperature of the liquid-crystalline crystal-smectic transition, rewetting of the surface follows resulting in a complete homogeneous monolayer. By subsequent controlled cooling to room temperature, cooling-rate-dependent kinetics is observed; at rapid cooling, a stable monolayer is preserved at room temperature, whereas slow cooling causes bilayer structures. Increasing the understanding and control of monolayer formation is of high relevance for achieving ordered functional monolayers with defined two-dimensional packing, for future applications in the field of organic electronics.

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Determination of critical island size inpara-sexiphenyl islands on SiO₂using capture-zone scaling

Cited by 31 publications

References 29 publications

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

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

Scaling in reversible submonolayer deposition

Dynamics of Monolayer–Island Transitions in 2,7‐Dioctyl‐benzothienobenzthiophene Thin Films

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Determination of critical island size inpara-sexiphenyl islands on SiO2using capture-zone scaling

Cited by 31 publications

References 29 publications

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

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

Scaling in reversible submonolayer deposition

Dynamics of Monolayer–Island Transitions in 2,7‐Dioctyl‐benzothienobenzthiophene Thin Films

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Product

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Determination of critical island size inpara-sexiphenyl islands on SiO₂using capture-zone scaling