Temperature-dependent transition from injection-limited to space-charge-limited current in metal-organic diodes

Yi Zheng; Wee, Andrew T. S.; Troadec, Cedric; Chandrasekhar, N.
October 2009
Applied Physics Letters;10/5/2009, Vol. 95 Issue 14, p143303
Academic Journal
Based on the assumption that the contact barrier height determines the current flow in organic semiconductor-based electronic devices, charge injection at metal-organic (MO) interfaces has been extensively investigated, while space-charge conduction in organic bulk is generally overlooked. Recent theoretical modeling and simulation have pointed out that such a simplification is questionable due to the hopping nature of charge injection and hopping-related space-charge conduction. Here we show experimentally that charge transport in MO diodes is a complex interplay between injection-limited current (ILC) and space-charge-limited current (SCLC). We report the experimental observation of ILC-to-SCLC transition in Ag/pentacene/Ag diodes as a function of temperature.


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