Charge transport by superexchange in molecular host-guest systems

F. Symalla, P. Friedrich, A. Massé, V. Meded, R. Coehoorn, P.A. Bobbert, W. Wenzel

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)
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Abstract

Charge transport in disordered organic semiconductors is generally described as a result of incoherent hopping between localized states. In this work, we focus on multicomponent emissive host-guest layers as used in organic light-emitting diodes (OLEDs), and show using multiscale ab initio based modeling that charge transport can be significantly enhanced by the coherent process of molecular superexchange. Superexchange increases the rate of emitter-to-emitter hopping, in particular if the emitter molecules act as relatively deep trap states, and allows for percolation path formation in charge transport at low guest concentrations.
Original languageEnglish
Article number276803
Number of pages6
JournalPhysical Review Letters
Volume117
Issue number27
DOIs
Publication statusPublished - 29 Dec 2016

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