Smoothing and coherent structure formation in organic-organic heterostructure growth

Hinderhofer, Alexander; Gerlach, Alexander; Kowarik, Stefan; Zontone, Federico; Krug, Joachim; Schreiber, Frank

doi:10.1209/0295-5075/91/56002

Cited by 32 publications

(27 citation statements)

References 23 publications

(44 reference statements)

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“…At 303 K, the non-equimolar mixtures, in particular, exhibit very pronounced oscillations, indicating very smooth films. This might be explained by C 60 filling the voids between the 6T domains or vice versa, similar to results for perfluoropentacene deposited on diindenoperylene or pentacene on perfluoropentacene, where a small step edge barrier leads to a smoothing of the bottom layer when an overlayer is deposited on top (Hinderhofer et al, 2010).…”

Section: Resultssupporting

confidence: 68%

Growth and annealing kinetics of α-sexithiophene and fullerene C₆₀mixed films

et al. 2016

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Thin films of -sexithiophene (6T) and C 60 mixtures deposited on nSiO substrates at 303 and 373 K were investigated in real time and in situ during the film growth using X-ray diffraction. The mixtures are observed to contain the well known 6T low-temperature crystal phase and the phase, which usually coexist in pure 6T films. The addition of C 60 modifies the structure to almost purely -phase-dominated films if the substrate is at 303 K. In contrast, at 373 K the low-temperature crystal phase of 6T dominates the film growth of the mixtures. Post-growth annealing experiments up to 373 K on equimolar mixtures and pure 6T films were also performed and followed in real time with X-ray diffraction. Annealing of pure 6T films results in a strong increase of film ordering, whereas annealing of equimolar 6T:C 60 mixed films does not induce any significant changes in the film structure. These results lend further support to theories about the important influence of C 60 on the growth behaviour and structure formation process of 6T in mixtures of the two materials.research papers

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Section: Resultssupporting

confidence: 68%

Growth and annealing kinetics of α-sexithiophene and fullerene C₆₀mixed films

et al. 2016

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“…The suitability of measuring the x-ray reflectivity at the so called anti-Bragg point in reciprocal space to study layer-by-layer growth has been demonstrated for several organic systems. 18,[35][36][37][38][39] Layer interference leads to temporal oscillations of the reflected intensity during layer-by-layer growth. 39,40 This can be seen directly from the equation for the reflected intensity I reflected (t), as calculated in kinematic approximation…”

Section: Resultsmentioning

confidence: 99%

Chain-length dependent growth dynamics of n-alkanes on silica investigated by energy-dispersive x-ray reflectivity in situ and in real-time

Weber

Bommel

Rukat

et al. 2012

The Journal of Chemical Physics

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We compare the growth dynamics of the three n-alkanes C(36)H(74), C(40)H(82), and C(44)H(90) on SiO(2) using real-time and in situ energy-dispersive x-ray reflectivity. All molecules investigated align in an upright-standing orientation on the substrate and exhibit a transition from layer-by-layer growth to island growth after about 4 monolayers under the conditions employed. Simultaneous fits of the reflected intensity at five distinct points in reciprocal space show that films formed by longer n-alkanes roughen faster during growth. This behavior can be explained by a chain-length dependent height of the Ehrlich-Schwoebel barrier. Further x-ray diffraction measurements after growth indicate that films consisting of longer n-alkanes also incorporate more lying-down molecules in the top region. While the results reveal behavior typical for chain-like molecules, the findings can also be useful for the optimization of organic field effect transistors where smooth interlayers of n-alkanes without coexistence of two or more molecular orientations are required.

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“…[79] For both systems, surface smoothing during thermal evaporation of the second material on top of the first is observed. The smoothing mechanism is sketched in Figure 3 a.…”

Section: Smoothing For A/b-type Heterostructuresmentioning

confidence: 91%

“…Another interesting effect is smoothing ( Figure 3), which was observed for growth of PFP on DIP and PEN on PFP. [79] For both systems, surface smoothing during thermal evaporation of the second material on top of the first is observed. The smoothing mechanism is sketched in Figure 3 a.…”

Section: Smoothing For A/b-type Heterostructuresmentioning

confidence: 91%

Organic–Organic Heterostructures: Concepts and Applications

2012

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We review basic concepts as well as recent examples and applications of organic-organic heterostructures. We organize the different types of heterostructures according to material A deposited on material B (A/B), A co-deposited with B (A:B), heterostructures in the monolayer regime including nanostructuring concepts and systems involving self-assembled monolayers, as well as various other architectures, including superlattices. While most examples are related to small-molecule organic semiconductors, many of the ideas can be applied to other systems. The central theme is growth and structure as well as optical and electronic properties. Finally, we comment on implications for device applications.

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Smoothing and coherent structure formation in organic-organic heterostructure growth

Cited by 32 publications

References 23 publications

Growth and annealing kinetics of α-sexithiophene and fullerene C₆₀mixed films

Growth and annealing kinetics of α-sexithiophene and fullerene C₆₀mixed films

Chain-length dependent growth dynamics of n-alkanes on silica investigated by energy-dispersive x-ray reflectivity in situ and in real-time

Organic–Organic Heterostructures: Concepts and Applications

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Smoothing and coherent structure formation in organic-organic heterostructure growth

Cited by 32 publications

References 23 publications

Growth and annealing kinetics of α-sexithiophene and fullerene C60mixed films

Growth and annealing kinetics of α-sexithiophene and fullerene C60mixed films

Chain-length dependent growth dynamics of n-alkanes on silica investigated by energy-dispersive x-ray reflectivity in situ and in real-time

Organic–Organic Heterostructures: Concepts and Applications

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Growth and annealing kinetics of α-sexithiophene and fullerene C₆₀mixed films

Growth and annealing kinetics of α-sexithiophene and fullerene C₆₀mixed films