Understanding the density functional dependence of DFT-calculated electronic couplings in organic semiconductors

Christopher Sutton, John S. Sears, Veaceslav Coropceanu, Jean-Luc Bredas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

We present an analysis of the magnitude of density functional theory (DFT)-calculated intermolecular electronic couplings (transfer integrals) in organic semiconductors to give insight into the impact that the choice of functional has on the value of this parameter, which is particularly important in the context of charge transport. The major factor determining the magnitude of the calculated transfer integrals is the amount of nonlocal Hartree-Fock (HF) exchange within a given functional, with the transfer integrals increasing by up to a factor of 2 when going from 0 to 100% HF exchange for a series of conventional functionals. We underline that these variations in the transfer integrals are in fact to be expected, with the computed transfer integrals evolving linearly with the amount of HF exchange. We also use a long-range corrected functional to tune the contributions of (semi)local and nonlocal HF exchanges and highlight their respective roles as a function of intermolecular separation.

Original languageEnglish (US)
Pages (from-to)919-924
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume4
Issue number6
DOIs
StatePublished - Mar 21 2013

Keywords

  • charge transport
  • exchange
  • hybrid functional
  • long-range corrected functional
  • organic semiconductor
  • transfer integral

ASJC Scopus subject areas

  • Materials Science(all)

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