Charge Recombination Suppressed by Destructive Quantum Interference in Heterojunction Materials

Roel Tempelaar, L. Jan Anton Koster, Remco W.A. Havenith, Jasper Knoester, Thomas L.C. Jansen*

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We show that charge recombination in ordered heterojunctions depends sensitively on the degree of coherent delocalization of charges at the donor-acceptor interface. Depending on the relative sign of the electron and hole transfer integrals, such delocalization can dramatically suppress recombination through destructive quantum interference. This could explain why measured recombination rates are significantly lower than predictions based on Langevin theory for a variety of organic bulk heterojunctions. Moreover, it opens up a design strategy for photovoltaic devices with enhanced efficiencies through coherently suppressed charge recombination.

Original languageEnglish (US)
Pages (from-to)198-203
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume7
Issue number1
DOIs
StatePublished - Jan 7 2016

Keywords

  • Langevin theory
  • bimolecular recombination
  • organic photovoltaics
  • quantum coherence

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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