Polyfluorene as a model system for space-charge-limited conduction

Details Polyfluorene as a model system for space-charge-limited conduction Polyfluorene as a model system for space-charge-limited conduction

2007-03-21

arxiv.org/abs/cond-mat/0703554v1

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 4 figures. Physical Review B (accepted, 2007)

Scientific paper

10.1103/PhysRevB.75.195202

Ethyl-hexyl substituted polyfluorene (PF) with its high level of molecular disorder can be described very well by one-carrier space-charge-limited conduction for a discrete set of trap levels with energy $\sim$ 0.5 eV above the valence band edge. Sweeping the bias above the trap-filling limit in the as-is polymer generates a new set of exponential traps, which is clearly seen in the density of states calculations. The trapped charges in the new set of traps have very long lifetimes and can be detrapped by photoexcitation. Thermal cycling the PF film to a crystalline phase prevents creation of additional traps at higher voltages.

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