The growth process of pentacene crystals
obtained by the physical vapor transport technique is discussed on the basis of
the results of optical microscopy and X-ray topography. At the initial stage of
physical vapor growth, many pentacene whisker crystals were grown. After that,
the morphology of the whiskers developed to dendrites. Then, the whisker
crystals themselves became the main branches of the dendritic crystals formed
at the initial stage, and many side branches were created from the lateral
surfaces of the whisker crystals. Some of the dendritic crystals continued to
develop to form plateletlike crystals with a dendritic configuration. Regarding
the plateletlike crystals with a parallelogram configuration, traces of the
dendrites are thought to sometimes be left inside these plateletlike crystals
on the basis of the results of optical microscopy and X-ray topography.
Plateletlike crystals with a parallelogram configuration are considered to
sometimes grow via the formation of dendritic crystals.
Source:IOPscience
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