Charge equilibration and potential steps in organic semiconductor multilayers

G. Brocks, Deniz Cakir, Menno Bokdam, Machiel Pieter de Jong, M. Fahlman

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)

Abstract

Substantial potential steps ∼0.5 eV are frequently observed in organic multilayers of donor and acceptor molecules. Often such potential steps depend on the order in which the individual layers are deposited, or on which substrate they are deposited. In this paper we outline a model for these potential steps, based upon integer charge transfer between donors and acceptors, charge equilibration across the multilayer, and simple electrostatics. Each donor, acceptor, or substrate material is characterized by a pinning level, and the potential profile can be deduced from the sequential order of the layers, and the differences between their pinning levels. For particular orderings we predict that intrinsic potential differences lead to electric fields across individual layers, which may falsely be interpreted as band bending.
Original languageUndefined
Pages (from-to)1793-1801
Number of pages9
JournalOrganic electronics
Volume13
Issue number10
DOIs
Publication statusPublished - Oct 2012

Keywords

  • METIS-290461
  • EWI-22902
  • IR-83567

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