Recombination at heterojunctions in disordered organic media: Modeling and numerical simulations

Ivan Jurić, Ivo Batistić, and Eduard Tutiš
Phys. Rev. B 77, 165304 – Published 2 April 2008

Abstract

Multilayer organic electroluminescent devices derive their advantages over their single-layer counterparts from the processes occurring at heterojunctions in organic media. These processes significantly differ from those in the bulk of the material. This paper presents three-dimensional modeling, numerical simulations, and a discussion of transport and recombination in a system with a heterojunction. We consider partial cross sections for the creation of excitons and exciplexes, and probabilities for recombination in the respective channels. We examine the influence of the energy barrier, electric field, site-energy disorder, and structural disorder at an organic-organic interface on transport and recombination. In particular, we investigate optimal parameter domains for recombination in the exciton channel. The interface roughness, unlike the site-energy disorder, is found to strongly affect the partial cross sections.

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  • Received 30 October 2007

DOI:https://doi.org/10.1103/PhysRevB.77.165304

©2008 American Physical Society

Authors & Affiliations

Ivan Jurić1,*, Ivo Batistić2, and Eduard Tutiš1,†

  • 1Institute of Physics, Bijenička c. 46, P.O. Box 304, HR-10001 Zagreb, Croatia
  • 2Department of Physics, University of Zagreb, Bijenička c. 32, P.O. Box 331, HR-10002 Zagreb, Croatia

  • *ijuric@ifs.hr
  • edo@ifs.hr

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Vol. 77, Iss. 16 — 15 April 2008

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