Injection and strong current channeling in organic disordered media (CROSBI ID 107702)
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Podaci o odgovornosti
Tutiš, Eduard ; Batistić, Ivo ; Berner, Detlef
engleski
Injection and strong current channeling in organic disordered media
We consider charge injection from a metal into amorphous organic molecular media with correlated disorder. It is shown that correlations, known to be essential for understanding the field dependence of the carrier mobility, also strongly influence the injection current distribution. In particular, we find that the injection hot spots are intrinsic for metal/organic interfaces, even for perfectly flat surfaces. The current density variations reach several orders of magnitude for realistic material parameters. The injection hot spots further induce current channels in the bulk of the material that extend a hundred nanometers beyond the injection surface. For electronic devices based on thin amorphous organic films, as are the organic light-emitting diodes, this current channeling is expected to have a serious impact on device characteristic and performance.
hopping ; injection barrier ; correlated disorder
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Podaci o izdanju
70
2004.
161202
3
objavljeno
1098-0121
1550-235X
10.1103/PhysRevB.70.161202