Morphology and structural properties of thin rubrene crystallites grown on graphite
arxiv(2024)
摘要
Crystallization of rubrene, progressing from an amorphous phase to a
triclinic meta-stable and ultimately to the orthorhombic stable phase, offers
broad applications not only in organic electronic devices but also for in-depth
studies of optical and electronic properties, including exciton distribution
and dynamics. We investigate the crystallization of rubrene on highly oriented
pyrolytic graphite (HOPG), aiming at the growth of the preferred rubrene
orthorhombic phase, which has been reported to have one of the highest charge
mobilities in organic semiconductors. This is achieved through controlled
heating and enhanced partial pressure. Through precise control of the initial
deposition on the substrate, we investigate the growth habit of rubrene
crystals by high-rate heat treatment beyond the second crystallization
temperature. Furthermore, this work addresses thermal stability and
photodegradation across various morphologies.
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