Injection and strong current channeling in organic disordered media

Tutiš, Eduard and Batistić, Ivo and Berner, Detlef (2004) Injection and strong current channeling in organic disordered media. Physical Review B, 70 (16). pp. 161202-4. ISSN 1098-0121

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Abstract

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.

Item Type: Article
Keywords: hopping, injection barrier, correlated disorder
Date: October 2004
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2004) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119256, 0035007
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 24 May 2014 13:19
Last Modified: 24 May 2014 13:19
URI: http://digre.pmf.unizg.hr/id/eprint/1669

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