Study on the Effect of Chemically Different Substrates on Nucleation and Growth Mechanism of Perfluoropentacene Thin Films

We studied the effect of chemical properties of substrates on the structural properties of perfluoropentacene (PFP) thin films grown by the supersonic molecular beam deposition technique. To this end, we have used m-carborane-1-thiol, template-stripped gold, and mica substrate surfaces and investigated the PFP film properties as a function of film thickness and molecular flux (deposition rate). On all three substrates, the PFP molecules adsorb in standing-up orientation in the first layer and overlayers. However, with an increasing hydrophobicity of the substrate, the mean grain size in the first layer increases. Bulk-like PFP films with needle-shaped grains grow on top of the first (wetting) layer on all the substrates, with smaller and taller grains on gold and larger and wider grains on mica surfaces.


Revealing Laser Crystallization Mechanism of Silicon Thin Films via Pulsed IR Lasers
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Pulsed laser absorption-mediated explosive crystallization of silicon films has extensively been studied using microscopy techniques on single laser pulse-irradiated regions in the literature. In this work, we experimentally demonstrate and theoretically explain in detail the use of slow quenching regime for laser crystallization mediated by highly overlapping pulses. Increasing the use of Si in thin film transistors and photovoltaic applications drives researchers to find cost-effective and efficient ways ...
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Terahertz time domain spectroscopy (THz-TDS) has been used to study the electrical and optical properties of a series of carbon nanofibers (CNFs) that have undergone different heat treatments. The high-temperature heat-treated (HHT) sample displayed increased absorption and real refractive indices across the range 0.3-3.5 THz when compared to the low-temperature heat-treated (LHT) and pyrolitically stripped (PS) samples. The experimental results were fitted by using a Drude-Lorentz model and an effective me...
Determination of current transport characteristics in Au-Cu/CuO/n-Si Schottky diodes
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In this study, the material properties of CuO thin films fabricated by sputtering technique and electrical properties of CuO/n-Si structure were reported. Temperature-dependent current-voltage (I-V) measurement was carried out to determine the detail electrical characteristics of this structure. The anomaly in thermionic emission (TE) model related to barrier height inhomogeneity at the interface was obtained from the forward bias I-V analysis. The current transport mechanism at the junction was determined ...
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The adsorption of the hydrogen peroxide (H2O2) molecule, which is known as the common form of reactive oxygen species in living cells, was investigated theoretically over pure graphene and heteroatom- (nitrogen-, boron-, and sulfur-) and metal-atom- (silver-, gold-, copper-, palladium-, and platinum-) doped graphene surfaces using the density functional theory (DFT) method. This study involved the optimization of pure and doped graphene surfaces, adsorption of the gas molecule on top of the doped atoms and ...
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The systematic trends in structural and electronic properties of perylenediimide (PDI)-derived dye molecules have been investigated by DFT calculations based on the projector-augmented wave (PAW) method including gradient-corrected exchange-correlation effects. Time-dependent density functional theory (TDDFT) calculations have been performed to study the visible absorbance activity of these complexes. The effect of different ligands and halogen atoms attached to PDI were studied to characterize the light-ha...
Citation Formats
A. Yavuz and M. F. Danışman, “Study on the Effect of Chemically Different Substrates on Nucleation and Growth Mechanism of Perfluoropentacene Thin Films,” JOURNAL OF PHYSICAL CHEMISTRY C, pp. 19610–19618, 2019, Accessed: 00, 2020. [Online]. Available: