engleski

Charge transport across organic-organic interfaces in organic light-emitting diodes

The process of the hopping transport across organic heterojunctions stands in the heart of functioning of organic light emitting diodes (OLED) and many other currently developed organic electronic devices. We consider the case of a hole-only (i.e. homopolar) heterojunction with Gaussian energetic disorder. We cross-compare the results of our previous multiparticle Monte Carlo simulator and master equation calculations to results of the analytic hopping model of Arkhipov and coworkers [V.I. Arkhipov et al. J. Appl. Phys. {;\bf 90};, 2352 (2001)]. This comparison made possible to point out and correct the shortcomings of the latter model. This includes the new definition of the injection level at the heterojunction, which brings orders of magnitude change of the current with respect to values obtained for previously used injection levels. Further insight, related to backward-to-forward hopping ratio at the heterojunction also brings in the order of magnitude correction for the current. We end up with a rather complete and cross-verified analytic description of the charge transport across energetically disordered homopolar heterojunctions.

organic heterojunction; tunneling; disorder; thermalization

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