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

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

2009-09-22

arxiv.org/abs/0909.4010v1

Appl. Phys. Lett. 95, 143303 (2009)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1063/1.3243844

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 metal-organic diodes is 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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