Here, we use atomic force microscopy (AFM) to study the morphology and growth kinetics of para-sexiphenyl layers deposited by hot wall epitaxy on crystalline KCl(001) substrates. It is shown that the growth process is quite complex and can be divided preliminarily into two steps. The initial growth stage is characterized by the formation of long needlelike crystallites built of “lying” molecules and oriented mainly into the ⟨110⟩ directions in accordance with the substrate’s fourfold symmetry. If the coverage increases, terraced crystalline mounds composed of monolayers of upright standing molecules start to develop between the needles. The mound formation is due to repeated two-dimensional nucleation of para-sexiphenyl molecules. By means of phase imaging in the AFM tapping mode, it could be further demonstrated that both needlelike crystallites and flat terraced mounds grow directly on the substrate surface, i.e., there is no wetting layer formed during the deposition of para-sexiphenyl on KCl(001).
A comparative study of steady-state and time-resolved photoluminescence of para-sexiphenyl (PSP) films grown by organic molecular beam epitaxy (OMBE) and hot wall epitaxy (HWE) under comparable conditions is presented. Using different template substrates [mica(001) and KCl(001) surfaces] as well as different OMBE growth conditions has enabled us to vary greatly the morphology of the PSP crystallites while keeping their chemical structure virtually untouched. We prove that the broad redshifted emission band has a structure-related origin rather than being due to monomolecular oxidative defects. We conclude that the growth conditions and type of template substrate impacts substantially on the film morphology (measured by atomic force microscopy) and emission properties of the PSP films. The relative intensity of the defect emission band observed in the delayed spectra was found to correlate with the structural quality of PSP crystallites. In particular, the defect emission has been found to be drastically suppressed when (i) a KCl template substrate was used instead of mica in HWE-grown films, and (ii) in the OMBE-grown films dominated by growth mounds composed of upright standing molecules as opposed to the films consisting of crystallites formed by molecules lying parallel to the substrate.
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