Abstract
Inherent growth features for molecular crystals have been discovered by vapor-phase deposition of perylene molecules onto a liquid film. We have observed a unidirectional anisotropy in the growth of needle crystals, which indicates different accommodation probabilities at opposite steps. This observation shows that the extended and generally anisotropic molecular shape will introduce important steric effects on crystal growth which are absent from inorganic crystal growth. We have also observed a creased growth morphology for square crystals. Step interactions have been proposed as the possible mechanism of the creased growth.
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