Observation of the Mott–Gurney law in tris (8-hydroxyquinoline) aluminum films

Kiy, M.; Losio, P.; Biaggio, I.; Koehler, M.; Tapponnier, A.; Gu¨nter, P.
February 2002
Applied Physics Letters;2/18/2002, Vol. 80 Issue 7, p1198
Academic Journal
We show that tris (8-hydroxyquinoline) aluminum (Alq[SUB 3]) thin films produced and characterized under ultrahigh vacuum conditions present a well-defined squared-law dependence of the injected current on the applied voltage at applied electric fields of the order of 0.25-1 MV/cm. From this, one derives an electric-field-independent electron mobility of the order of 10[SUP -7] cm[SUP 2]/(V s), with a variation between different samples of about one order of magnitude. Observations of current-voltage characteristics with clear indications of trap-filling and space-charge-limited conduction at high fields in Alq[SUB 3] excludes the existence of traps with an exponential distribution of trap energies, as is commonly assumed in amorphous materials.


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