Modification of charge transport in single crystal rubrene
2007
To investigate the impact of impurities on properties of single crystals of rubrene (C 48 H 24 ), we consider structural,
charge transport and optical properties. We show that transport properties are strongly influenced by the presence of a
bandgap acceptor state, commonly occurring in crystals of rubrene. The bandgap state is likely caused by incorporation
of an oxygen-related impurity. We demonstrate that the impurity presence can be detected using optical spectroscopy.
The impurity model explains commonly-observed variations of rubrene properties. The acceptor-like characteristics of
the impurity suggests a possible approach for modification of the charge transport in molecular crystals.
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